ITC LIMITED PAPERBOARDS & SPECIALITY PAPERS DIVISION
Technical ReportProtective Relay Co-ordination
February – 2006
By
Engineering Service Excellence
Elsytec Power Projects Pvt Ltd Consultancy & Engineering Services
Chennai-600 083
UNIT - KOVAI
Contents
S.No Description Page No
1. Introduction 1
2. Executive Summary 2
3. Relay Settings and Timings
3.1. Over Current Relay Settings
3.1.1. Fault Calculations 4
3.1.2. Recommended Over Current Settings 7
3.1.3. Existing Relay Settings for Over Current 13
3.1.4. Time-Current Characteristics Curves 19
3.2. Earth Fault Relay Settings
3.2.1. Recommended Earth Fault Relay Settings 22
3.2.2. Existing Relay Settings 30
4 Comparison of Existing and Recommended Settings
4.1. Over Current Settings 36
4.2. Earth Fault Settings 42
5 Proposed additional Relays recommended by Elsytec 48
6. Recommended Settings for Over Current and Earth Fault 49
7. Relay Catalogues
8. Single Line Diagrams
6.1. Single line Diagram Showing Over Current Relay Setting & Timings. (Drg.No: EPPPL/1188/ITC/001)
6.2. Single line Diagram Showing Earth Fault Relay Setting & Timings. (Drg.No: EPPPL/1188/ITC/002)
1. INTRODUCTION
1. INTRODUCTION
Elsytec Power Projects Pvt Ltd Chennai was asked to study the protective relaying at ITC
Kovai Unit in the wake of recent disturbances in grid and local faults in the plant which caused
tripping of their in plant turbine as well as Utility supply. Also any addition /alteration required to
protective relaying scheme were asked to be identified in the light of their proposed export of
power from in plant generator to Grid.
A snap study was undertaken by Elsytec Power Projects Pvt Limited by making a visit to
their plant on 16th and 17th of Jan 2006 and Electrical system details along with protection scheme
were studied by holding discussions with their engineers.
Following are the high lights of discussion and study.
• Three major tripping that happened recently were discussed in depth and details analyzed
• The analysis revealed serious shortcomings in the maintenance of system which led to the
faulty tripping of in plant generator and Grid
• Failure to connect/test certain protective relays
• Necessity to tighten the preventive maintenance checks which are vulnerable in nature
• Necessity to check the relay co-ordination as well as test and calibrate the relays
• Necessity check and revamp earthing system
This report details the present settings and analyses the tripping scenarios in the faults that
affected the plants as well as scenarios faults at various levels. The report also details the existing
settings, their tripping times, previous consultant’s settings and their tripping time and under
various scenarios and Elsytec’s suggested modification in settings where necessary.
Report is divided in to following sections:
• Fault level calculations
• Existing settings and tripping times and sequence during 3.0kV fault which crippled the
mill
• Tripping times for faults at various buses
• Elsytec’s suggested settings for proper Co-ordination with various settings in tabular
format and setting marked in SLD for easy reference
2.EXECUTIVE SUMMARY
2. EXECUTIVE SUMMARY
Present scenario Electrical Installation:
The H.T distribution of electrical installation is shown in Dwg No: TCE-4312A-733-
AU-3002 and it primarily consists of the following:
• 110 kV substation with its attendant breakers and CT’s and isolators
10/12.5 MVA 110kV/11kV transformer
• Neutral grounding Resistor to limit the earth fault current to 100 amps
• 11 KV switchgear SB1, SB2, SB3, SB4 comprising of withdrawal type Vacuum circuit
breaker switchgear
• Distribution Transformers ratings 1 MVA11kV/3.0 kV, 2.5MVA 11kV/433 volts,
2.0MVA 11kV/433V, 1.6MVA 11kV/433V and 315kVA, 11kV/433 volts
• All 433 volts secondary side neutral of transformer are solidly earthed
• 3.0 KV side of 11kV/3.0kV transformers neutral is resistor earthed to limit the current to
100 amps.
In plant Generator:
• 8MW 11kV extraction cum condensing set has been recently commissioned
• This is connected to associated vacuum circuit breaker board as shown in single line
diagram and hooked up to switchgear SB1 through tie breakers
• Condensing capacity is understood be 3.5 MW
• In plant generator can meet almost entire load of mill
Operating Scenario:
Normally the in plant generator and Grid are operated in parallel with necessary
protection and synchronizing facilities as shown single diagram. Marginal power to the tune of
500kW is drawn under healthy condition. In case of Grid disturbances Vector surge relay in 11kV
switchgear in SB1 islands the generator.
Protection scenario:
• All 11kV switchgear are provided with IDMTL electromagnetic relays of Type TJM
Easun Reyrolle make for their associated feeder protection with two over current and one
earth fault element
• Sensitive earth fault relays type MIT Easun Reyrolle make are also seen to be
provided in SB1 and appear to have not been connected and they appear to be in
service in Generator panel
• Vector surge relay of type MICOM GE Alstom make is in service at 11kV incomer
breaker of grid at SB1 and appears to be operating effectively
Recommendation and comments:
Elsytec Power projects Pvt Ltd has carried out detailed fault calculation study
and arrived at appropriate settings for the relay coordination consistent with plant
scenarios.
1. Basically the presents settings need adjustments to the new values indicated in the report
as present settings lack co ordination as given in Section-3.
2. It may be noted that incoming fault level and equivalent line impedance is ignored in this
fault calculations, as it is less than 10% of the available impedances of the mill circuits.
Also the cable impedances are not taken into consideration as these values are very small
to have any effect in the calculations.
3. Neutral CT and sensitive earth fault relay in 433 volts transformer neutral is to be
provided.
4. Sensitive earth fault relay in SB1 to be put in service. It should be noted that certain faults
in the system like 3.0 kV bus faults will not operate the O/C element of 11kV switchgear
as the fault current will not be sufficient to operate these relays and residual current in
sensitive earth fault relay can only serve as back up for 3kV system protective relays.
5. Please note Instantaneous settings in present settings are 99.99%, may be this is to be
switched off.
6. Reverse power element in MICOM relay to be disabled as and when the generator is
connected for export of power after discussing with TNEB for any other requirements for
export of power.
7. It is imperative D.C trip supply is maintained in healthy condition to avoid repetition of
failures and prevent fire risks and burn outs in future Possibly Trip supply supervision
relay and alarm at central place like T.G control panel can be installed apart from daily
check of “trip circuit healthy” lamp check manually on daily basis.
8. Earthing system integrity and maintain earth grid resistance with in 1ohm is a basic
requirement.
9. Relay and meter testing shall be carried out at periodic interval not exceeding 2 year is a
must.
3.RELAY SETTINGS & TIMINGS
Project : ITC Ltd PSPD - Kovai Unit ELSYTEC POWER PROJECTS PVT LTD,CHENNAI.
3.1. Over Current Relay Settings
Base 10 MVASB-1 (11kV)Transformer (10MVA) = 9.61 %TG(8MW) = 12 % SOURCE CURRENTT/F || TG = 5.33641832 % T/F 5.462%Zeq = 5.33641832 % TG 4.374Fault MVA = 187.392 MVA 9.836Short Circuit Current Isc = 9.836 kA
SB-2 (11kV)Transformer (10MVA) = 9.61 %TG (8MW) = 12 % SOURCE CURRENTT/F || TG = 5.33641832 % T/F 5.462%Zeq = 5.33641832 % TG 4.374Fault MVA = 187.392 MVA 9.836Short Circuit Current Isc = 9.836 kA
SB-3 (11kV)Transformer (10MVA) = 9.61 % SOURCE CURRENTTG(8MW) = 12 % T/F 5.462T/F || TG = 5.33641832 % TG 4.374%Zeq = 5.33641832 % 9.836Fault MVA = 187.392 MVAShort Circuit Current Isc = 9.836 kA
SB-4 (11kV)Transformer (10MVA) = 9.61 % SOURCE CURRENTTG(8MW) = 12 % T/F 5.462T/F || TG = 5.33641832 % TG 4.374%Zeq = 5.33641832 % 9.836Fault MVA = 187.392 MVAShort Circuit Current Isc = 9.836 kA
SB-5 (3kV)a Transformer (10MVA) = 9.61 % SOURCE CURRENTb TG(8MW) = 12 % T/F 0.5266985c Tr-2 (1MVA) = 50 % TG 0.422d a || b = 5.336 % 0.948e %Zeq = c+d = 55.336 %
Fault MVA = 18.071 MVAShort Circuit Current Isc = 3.478 kA
TG-PMCC-3 (3.3kV)a Transformer (10MVA) = 9.61 % SOURCE CURRENTb TG(8MW) = 12 % T/F 0.9300875c Aux.Tr-3 (2.5MVA) = 26 % TG 0.745d a || b = 5.33641832 % 1.675e %Zeq = c+d = 31.3364183 %
Fault MVA = 31.912 MVAShort Circuit Current Isc = 5.583 kA
3.1.1. Fault Calculations - Phase Fault
3. Relay Settings and Timings
4
Project : ITC Ltd PSPD - Kovai Unit ELSYTEC POWER PROJECTS PVT LTD,CHENNAI.
TG - PMCC1 (433V)a Transformer (10MVA) = 9.61 %b TG(8MW) = 12 % SOURCE CURRENTc Aux.Tr-1 (2MVA) = 40 % T/F 0.6428741d a || b = 5.33641832 % TG 0.515e %Zeq = c+d = 45.3364183 % 1.158
Fault MVA = 22.057 MVAShort Circuit Current Isc = 29.411 kA
TG-1 Switchgear (11kV)Transformer (10MVA) = 9.61 % SOURCE CURRENTTG (8MW) = 12 % T/F 5.4616429T/F || TG = 5.33641832 % TG 4.374%Zeq = 5.33641832 % 9.836Fault MVA = 187.392 MVAShort Circuit Current Isc = 9.836 kA
PMCC-1 (433V)a Transformer (10MVA) = 9.61 %b TG(8MW) = 12 % SOURCE CURRENTc Tr-1 (2.5MVA) = 28 % T/F 0.8742874d a || b = 5.33641832 % TG 0.700e %Zeq = c+d = 33.3364183 % 1.574
Fault MVA = 29.997 MVAShort Circuit Current Isc = 39.997 kA
PMCC-3 (433V)a Transformer (10MVA) = 9.61 %b TG(8MW) = 12 % SOURCE CURRENTc Tr-3 (2MVA) = 33.00 % T/F 0.7602591d a || b = 5.33641832 % TG 0.609e %Zeq = c+d = 38.3364183 % 1.369
Fault MVA = 26.085 MVAShort Circuit Current Isc = 34.781 kA
PMCC-4 (433V)a Transformer (10MVA) = 9.61 %b TG(8MW) = 12 % SOURCE CURRENTc Tr-4 (2MVA) = 32.8 % T/F 0.7642462d a || b = 5.33641832 % TG 0.612e %Zeq = c+d = 38.1364183 % 1.376
Fault MVA = 26.222 MVAShort Circuit Current Isc = 34.963 kA
PMCC-5 (433V)a Transformer (10MVA) = 9.61 %b TG(8MW) = 12 % SOURCE CURRENTc Tr-5 (2MVA) = 33.15 % T/F 0.757296d a || b = 5.33641832 % TG 0.606e %Zeq = c+d = 38.4864183 % 1.364
Fault MVA = 25.983 MVAShort Circuit Current Isc = 34.645 kA
5
Project : ITC Ltd PSPD - Kovai Unit ELSYTEC POWER PROJECTS PVT LTD,CHENNAI.
PMCC-6 (433V)a Transformer (10MVA) = 9.61 %b TG(8MW) = 12 % SOURCE CURRENTc Tr-6 (315kVA) = 147.301587 % T/F 0.190946d a || b = 5.33641832 % TG 0.153e %Zeq = c+d = 152.638006 % 0.344
Fault MVA = 6.551 MVAShort Circuit Current Isc = 8.736 kA
PMCC-7 (433V)a Transformer (10MVA) = 9.61 %b TG(8MW) = 12 % SOURCE CURRENTc Tr-7 (1.6MVA) = 41.9375 % T/F 0.6165262d a || b = 5.33641832 % TG 0.494e %Zeq = c+d = 47.2739183 % 1.110
Fault MVA = 21.153 MVAShort Circuit Current Isc = 28.205 kA
PMCC-8 (433V)a Transformer (10MVA) = 9.61 %b TG(8MW) = 12 % SOURCE CURRENTc Tr-8 (1.6MVA) = 40.4375 % T/F 0.6367297d a || b = 5.33641832 % TG 0.510e %Zeq = c+d = 45.7739183 % 1.147
Fault MVA = 21.847 MVAShort Circuit Current Isc = 29.130 kA
PMCC-9 (433V)a Transformer (10MVA) = 9.61 %b TG(8MW) = 12 % SOURCE CURRENTc Tr-9 (1.6MVA) = 41.5625 % T/F 0.6214559d a || b = 5.33641832 % TG 0.498e %Zeq = c+d = 46.8989183 % 1.119
Fault MVA = 21.322 MVAShort Circuit Current Isc = 28.431 kA
DCD-10 (433V)a Transformer (10MVA) = 9.61 %b TG(8MW) = 12 % SOURCE CURRENTc Tr-10 (1.6MVA) = 41.875 % T/F 0.6173424d a || b = 5.33641832 % TG 0.494e %Zeq = c+d = 47.2114183 % 1.112
Fault MVA = 21.181 MVAShort Circuit Current Isc = 28.243 kA
DCD- 11 (433V) a Transformer (10MVA) = 9.61 %b TG(8MW) = 12 % SOURCE CURRENTc Tr-11 (1.6MVA) = 41.625 % T/F 0.6206289d a || b = 5.33641832 % TG 0.497e %Zeq = c+d = 46.9614183 % 1.118
Fault MVA = 21.294 MVAShort Circuit Current Isc = 28.393 kA
6
S.No SB No Description Relay Type Fault Current in kA
Primary Current in
CT(A)PS TMS I//Ipu Tripping Time
(Sec)
252-3 SB-1 TIE TO TG-1 SG CDD 31 4.374 500 1 0.7 8.75 0.98252-26 TG-1 TIE TO SB-1 CDD 31 4.374 500 1 0.7 8.75 0.98252-21 TG-1 I/C FROM TG CDG 31 4.374 600 1 0.85 7.29 1.3
252-25 TG-1 OG TO AUX.TR-3 CDG 31 9.836 200 1 0.3 49.18 0.31252-21 TG-1 I/C FROM TG CDG 31 4.374 600 1 0.85 9.10 1.15252-1 SB-1 I/C FOR SB-1 TJM 10 5.462 800 1 0.4 6.83 1.5152-1 SB-1 I/C FROM 110kV Line ICM 21 0.546 75 1 0.85 7.28 2.4252-3 SB-1 TIE TO TG-1 SG CDD 31 5.462 500 1 0.7 10.92 0.88
252-26 TG-1 TIE TO SB-1 CDD 31 5.462 500 1 0.7 10.92 0.88
352-1 SB-5 I/C FROM TR-2 TJM 10 3.478 200 1 0.1 17.39 0.26252-10 SB-3 OG TO TR-2 TJM 10 0.948 100 0.75 0.1 12.65 0.39252-9 SB-3 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-3 TJM 10 0.948 400 1 0.3 2.37 2.4252-1 SB-1 I/C FOR SB-1 TJM 10 0.527 800 1 0.4 0.66 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 0.053 75 1 0.85 0.70 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 0.422 500 1 0.7 0.84 Infinity
252-26 TG-1 TIE TO SB-1 CDD 31 0.422 500 1 0.7 0.84 Infinity252-21 TG-1 I/C FROM TG CDG 31 0.422 600 1 0.85 0.70 Infinity
352-2 SB-6 I/C FROM AUX.TR-3 CDG 31 5.583 500 1 0.1 11.17 0.13252-25 TG-1 OG TO AUX.TR-3 CDG 31 1.675 200 1 0.3 8.37 0.42252-21 TG-1 I/C FROM TG CDG 31 0.930 600 1 0.85 1.55 6252-1 SB-1 I/C FOR SB-1 TJM 10 0.745 800 1 0.4 0.93 infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 0.074 75 1 0.85 0.99 infinity252-3 TG-1 TIE TO TG-1 SG CDD 31 0.745 500 1 0.7 1.49 4
252-26 TG-1 TIE TO SB-1 CDD 31 0.745 500 1 0.7 1.49 4
452-2 SB-4 I/C FROM AUX.TR-2 CDG 31 29.411 3000 1 0.1 9.80 0.13252-23 SB-3 OG TO AUX.TR-2 CDG 31 1.110 200 1 0.3 5.55 0.48252-21 SB-1 I/C FROM TG CDG 31 0.493 600 1 0.85 0.82 Infinity
Fault at TG-PMCC-2 (433V)
Fault at TG-1 (11kV)
Fault at SB-5 (3kV)
Fault at TG-PMCC-3 (3.3kV)
8
S.No SB No Description Relay Type Fault Current in kA
Primary Current in
CT(A)PS TMS I//Ipu Tripping Time
(Sec)
252-1 SB-1 I/C FOR SB-1 TJM 10 0.616 800 1 0.4 0.77 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 0.062 75 1 0.85 0.82 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 0.616 500 1 0.7 1.23 5
252-26 TG-1 TIE TO SB-1 CDD 31 0.616 500 1 0.7 1.23 5
452-11 PMCC1 I/C FROM SB2 CDG 31 39.997 4000 1 0.15 10.00 0.18252-8 SB-2 OG TO TR-1 NO RELAY252-7 SB-2 I/C FROM SB-1 TJM 10 1.574 150 1 0.3 10.50 0.88252-2 SB-1 OG TO SB-2 TJM 10 1.574 150 1 0.3 10.50 0.88252-1 SB-1 I/C FOR SB-1 TJM 10 0.874 800 1 0.4 1.09 12152-1 SB-1 I/C FROM 110kV Line ICM 21 0.087 75 1 0.85 1.17 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 0.700 500 1 0.7 1.40 5
252-26 TG-1 TIE TO SB-1 CDD 31 0.700 500 1 0.7 1.40 5252-21 TG-1 I/C FROM TG CDG 31 0.700 600 1 0.85 1.17 7
252-12 PMCC3 I/C FROM SB2 CDG 31 34.781 3000 1 0.15 11.59 0.18252-11 SB-3 OG TO TR-3 TJM 10 1.369 125 1 0.1 10.95 0.31252-9 SB-3 I/C FROM SB1 NO RELAY 1.369252-4 SB-1 OG TO SB-3 TJM 10 1.369 400 1 0.3 3.42 2.6252-1 SB-1 I/C OF SB-1 TJM 10 0.760 800 1 0.4 0.95 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 0.076 75 1 0.85 1.01 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 0.609 500 1 0.7 1.22 4.5252-26 TG-1 TIE TO SB-1 CDD 31 0.609 500 1 0.7 1.22 4.5252-21 TG-1 I/C FROM TG CDG 31 0.609 600 1 0.85 1.01 6
452-13 PMCC4 I/C FROM TR-4 CDG 31 34.963 3000 1 0.15 11.65 0.18252-12 SB-3 OG TO TR-4 TJM 10 1.376 125 1 0.1 11.01 0.31252-9 SB-3 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-3 TJM 10 1.376 400 1 0.3 3.44 2.6252-1 SB-1 I/C OF SB-1 TJM 10 0.764 800 1 0.4 0.96 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 0.076 75 1 0.85 1.02 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 0.764 500 1 0.7 1.53 4.5252-26 TG-1 TIE TO SB-1 CDD 31 0.764 500 1 0.7 1.53 4.5252-21 TG-1 I/C FROM TG CDG 31 0.612 600 1 0.85 1.02 6
Fault at PMCC-1 (433V)
Fault at PMCC-3 (433V)
Fault at PMCC-4 (433V)
9
S.No SB No Description Relay Type Fault Current in kA
Primary Current in
CT(A)PS TMS I//Ipu Tripping Time
(Sec)
452-14 PMCC-5 I/C FROM TR-5 CDG 31 34.645 3000 1 0.15 11.55 0.19252-13 SB-3 OG TO TR-5 TJM 10 1.364 125 1 0.1 10.91 0.31252-9 SB-3 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-3 TJM 10 1.364 400 1 0.3 3.41 2.6252-1 SB-1 I/C OF SB-1 TJM 10 0.757 800 1 0.4 0.95 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 0.076 75 1 0.85 1.01 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 0.757 500 1 0.7 1.51 4.5252-26 TG-1 TIE TO SB-1 CDD 31 0.757 500 1 0.7 1.51 4.5252-21 TG-1 I/C FROM TG CDG 31 0.606 600 1 0.85 1.01 6
452-20 PMCC-6 I/C FROM TR-6 CDG 31 8.736 600 1 0.15 14.56 0.15252-20 SB-4 OG TO TR-6 TJM 10 0.344 25 1 0.1 13.75 0.29252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 0.344 500 1 0.3 0.69 Infinity252-1 SB-1 I/C OF SB-1 TJM 10 0.191 800 1 0.4 0.24 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 0.019 75 1 0.85 0.25 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 0.153 500 1 0.7 0.31 Infinity
252-26 TG-1 TIE TO SB-1 CDD 31 0.153 500 1 0.7 0.31 Infinity252-21 TG-1 I/C FROM TG CDG 31 0.153 600 1 0.85 0.25 Infinity
452-19 PMCC-7 I/C FROM TR-7 CDG 31 28.205 2500 1 0.15 11.28 0.18252-19 SB-4 OG TO TR-7 TJM 10 1.110 100 1 0.1 11.10 0.3252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 1.110 500 1 0.3 2.22 2.6252-1 SB-1 I/C FOR SB-1 TJM 10 0.617 800 1 0.4 0.77 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 0.062 75 1 0.85 0.82 252-3 SB-1 TIE TO TG-1 SG CDD 31 0.494 500 1 0.7 0.99 Infinity
252-26 TG-1 TIE TO SB-1 CDD 31 0.494 500 1 0.7 0.99 Infinity252-21 TG-1 I/C FROM TG CDG 31 0.494 600 1 0.85 0.82 Infinity
Fault at PMCC-5 (433V)
Fault at PMCC-6 (433V)
Fault at PMCC-7 (433V)
10
S.No SB No Description Relay Type Fault Current in kA
Primary Current in
CT(A)PS TMS I//Ipu Tripping Time
(Sec)
452-18 PMCC-8 I/C FROM TR-8 CDG 31 29.130 2500 1 0.15 11.65 0.18252-18 SB-4 OG TO TR-7 TJM 10 1.147 100 1 0.1 11.47 0.3252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 1.147 500 1 0.3 2.29 2.6252-1 SB-1 I/C FOR SB-1 TJM 10 0.617 800 1 0.4 0.77 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 0.062 75 1 0.85 0.82 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 0.530 500 1 0.7 1.06 Infinity
252-26 TG-1 TIE TO SB-1 CDD 31 0.530 500 1 0.7 1.06 Infinity252-21 TG-1 I/C FROM TG CDG 31 0.530 600 1 0.85 0.88 Infinity
452-17 PMCC-9 I/C FROM TR-9 CDG 31 28.431 2500 1 0.15 11.37 0.18252-17 SB-4 OG TO TR-7 TJM 10 1.119 100 1 0.1 11.19 0.3252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 1.119 500 1 0.3 2.24 2.6252-1 SB-1 I/C FOR SB-1 TJM 10 0.621 800 1 0.4 0.78 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 0.062 75 1 0.85 0.83 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 0.498 500 1 0.7 1.00 Infinity
252-26 TG-1 TIE TO SB-1 CDD 31 0.498 500 1 0.7 1.00 Infinity252-21 TG-1 I/C FROM TG CDG 31 0.498 600 1 0.85 0.83 Infinity
452-16 DCD-10 I/C FROM TR-10 CDG 31 28.243 2500 1 0.15 11.30 0.18252-16 SB-4 OG TO TR-10 TJM 10 1.112 100 1 0.1 11.12 0.3252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 1.112 500 1 0.3 2.22 2.6252-1 SB-1 I/C FOR SB-1 TJM 10 0.617 800 1 0.4 0.77 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 0.062 75 1 0.85 0.82 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 0.494 500 1 0.7 0.99 Infinity
252-26 TG-1 TIE TO SB-1 CDD 31 0.494 500 1 0.7 0.99 Infinity252-21 TG-1 I/C FROM TG CDG 31 0.494 600 1 0.85 0.82 Infinity
Fault at PMCC-9 (433V)
Fault at DCD 10 (433V)
Fault at PMCC-8 (433V)
11
S.No SB No Description Relay Type Fault Current in kA
Primary Current in
CT(A)PS TMS I//Ipu Tripping Time
(Sec)
452-15 DCD-11 I/C FROM TR-11 CDG 31 28.393 2500 1 0.15 11.36 0.18252-15 SB-4 OG TO TR-11 TJM 10 1.118 100 1 0.1 11.18 0.3252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 1.118 500 1 0.3 2.24 2.6252-1 SB-1 I/C FOR SB-1 TJM 10 0.621 800 1 0.4 0.78 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 0.062 75 1 0.85 0.83 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 0.497 500 1 0.7 0.99 Infinity
252-26 TG-1 TIE TO SB-1 CDD 31 0.497 500 1 0.7 0.99 Infinity252-21 TG-1 I/C FROM TG CDG 31 0.497 600 1 0.85 0.83 Infinity
Fault at DCD 11 (433V)
12
S.No SB No Description Relay Type Fault Current in kA
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
1 SB-1 OG TO SB-2 TJM 10 9.836 150 1 0.5 65.57 1.22 SB-1 I/C FOR SB-1 TJM 10 5.462 800 0.75 0.7 9.10 2.13 SB-1 I/C FROM 110kV Line ICM 21 0.546 75 0.75 0.8 9.71 2.44 SB-1 TIE TO TG-1 SG CDD 31 4.374 500 1.25 0.95 7.00 1.35 TG-1 TIE TO SB-1 CDD 31 4.374 500 1 0.65 8.75 0.846 TG-1 I/C FROM TG CDG 31 4.374 600 1 0.4 7.29 0.58
1 SB-2 OG TO TR-1 NO RELAY2 SB-2 I/C FROM SB-1 TJM 10 9.836 150 0.5 0.5 131.14 13 SB-1 OG TO SB-2 TJM 10 9.836 150 1 0.5 65.57 1.24 SB-1 I/C FOR SB-1 TJM 10 5.462 800 0.75 0.7 9.10 2.15 SB-1 I/C FROM 110kV Line ICM 21 0.546 75 0.75 0.8 9.71 2.46 SB-1 TIE TO TG-1 SG CDD 31 4.374 500 1.25 0.95 7.00 1.37 TG-1 TIE TO SB-1 CDD 31 4.374 500 1 0.65 8.75 0.848 TG-1 I/C FROM TG CDG 31 4.374 600 1 0.4 7.29 0.58
1 SB-3 OG TO TR-2 TJM 10 9.836 100 0.5 0.4 196.71 0.752 SB-3 I/C FROM SB-1 NO RELAY3 SB-1 OG TO SB-3 TJM 10 9.836 400 1 0.6 24.59 1.254 SB-1 I/C FOR SB-1 TJM 10 5.462 800 0.75 0.7 9.10 2.25 SB-1 I/C FROM 110kV Line ICM 21 0.546 75 0.75 0.8 9.71 2.46 SB-1 TIE TO TG-1 SG CDD 31 4.374 500 1.25 0.95 7.00 1.457 TG-1 TIE TO SB-1 CDD 31 4.374 500 1 0.65 8.75 0.828 TG-1 I/C FROM TG CDG 31 4.374 600 1 0.4 7.29 0.58
1 SB-4 OG TO TR-11 TJM 10 9.836 100 0.75 0.5 131.14 12 SB-3 I/C FROM SB-1 NO RELAY3 SB-1 OG TO SB-4 TJM 10 9.836 500 1 0.7 19.67 1.74 SB-1 I/C FOR SB-1 TJM 10 5.462 800 0.75 0.7 9.10 2.1
3.1.3. Existing Relay Settings for Over Current
Fault at SB-4 (11kV)
Fault at SB-1 (11kV)
Fault at SB-2 (11kV)
Fault at SB-3 (11kV)
S.No SB No Description Relay Type Fault Current in kA
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
5 SB-1 I/C FROM 110kV Line ICM 21 0.546 75 0.75 0.8 9.71 2.46 SB-1 TIE TO TG-1 SG CDD 31 4.374 500 1.25 0.95 7.00 1.457 TG-1 TIE TO SB-1 CDD 31 4.374 500 1 0.65 8.75 0.828 TG-1 I/C FROM TG CDG 31 4.374 600 1 0.4 7.29 0.58
1 TG-1 OG TO AUX.TR-3 CDG 31 9.836 200 1 0.55 49.18 0.552 TG-1 I/C FROM TG CDG 31 4.374 600 1 0.4 9.10 2.33 SB-1 I/C FOR SB-1 TJM 10 5.462 800 0.75 0.7 9.10 2.14 SB-1 I/C FROM 110kV Line ICM 21 0.546 75 0.75 0.8 9.71 2.45 SB-1 TIE TO TG-1 SG CDD 31 5.462 500 1.25 0.95 8.74 1.36 TG-1 TIE TO SB-1 CDD 31 5.462 500 1 0.65 10.92 0.84
1 SB-5 I/C FROM TR-2 TJM 10 3.478 200 1 0.3 17.39 0.751 SB-3 OG TO TR-2 TJM 10 0.948 100 0.5 0.4 18.97 0.852 SB-3 I/C FROM SB-1 NO RELAY3 SB-1 OG TO SB-3 TJM 10 0.948 400 1 0.6 2.37 4.54 SB-1 I/C FOR SB-1 TJM 10 0.527 800 0.75 0.7 0.88 Infinity5 SB-1 I/C FROM 110kV Line ICM 21 0.053 75 0.75 0.8 0.94 Infinity6 SB-1 TIE TO TG-1 SG CDD 31 0.422 500 1.25 0.95 0.67 Infinity7 TG-1 TIE TO SB-1 CDD 31 0.422 500 1 0.65 0.84 Infinity8 TG-1 I/C FROM TG CDG 31 0.422 600 1 0.4 0.70 Infinity
1 SB-4 I/C FROM AUX.TR-2 CDG 31 29.411 3000 1 0.15 9.80 12 SB-3 OG TO AUX.TR-2 CDG 31 1.110 200 1 0.5 5.55 0.793 SB-1 I/C FROM TG CDG 31 0.493 600 1 0.4 0.82 Infinity4 SB-1 I/C FOR SB-1 TJM 10 0.616 800 0.75 0.7 1.03 205 SB-1 I/C FROM 110kV Line ICM 21 0.062 75 0.75 0.8 1.10 Infinity6 SB-1 TIE TO TG-1 SG CDD 31 0.616 500 1.25 0.95 0.99 67 TG-1 TIE TO SB-1 CDD 31 0.616 500 1 0.65 1.23 4
Fault at SB-5 (3kV)
Fault at TG-1 (11kV)
Fault at TG-PMCC-2 (415V)
S.No SB No Description Relay Type Fault Current in kA
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
1 SB-6 I/C FROM AUX.TR-3 CDG 31 5.583 500 1 0.15 11.17 0.182 SB-1 OG TO AUX.TR-3 CDG 31 5.583 200 1 0.55 27.92 1.83 SB-1 I/C FROM TG CDG 31 0.745 600 1 0.4 1.24 2.34 SB-1 I/C FOR SB-1 TJM 10 0.930 800 0.75 0.7 1.55 135 SB-1 I/C FROM 110kV Line ICM 21 0.310 75 0.75 0.8 5.51 3.26 SB-1 TIE TO TG-1 SG CDD 31 0.930 500 1.25 0.95 1.49 57 TG-1 TIE TO SB-1 CDD 31 0.930 500 1 0.65 1.86 2.5
1 PMCC1 I/C FROM SB2 CDG 31 39.997 4000 0.5 0.3 20.00 0.312 SB-2 I/C FROM SB-1 TJM 10 1.574 150 0.5 0.5 20.99 13 SB-1 OG TO SB-2 TJM 10 1.574 150 1 0.5 10.50 1.24 SB-1 I/C FOR SB-1 TJM 10 0.874 800 0.75 0.7 1.46 2.15 SB-1 I/C FROM 110kV Line ICM 21 0.087 75 0.75 0.8 1.55 2.46 SB-1 TIE TO TG-1 SG CDD 31 0.700 500 1.25 0.95 1.12 1.37 TG-1 TIE TO SB-1 CDD 31 0.700 500 1 0.65 1.40 0.848 TG-1 I/C FROM TG CDG 31 0.700 600 1 0.4 1.17 0.58
1 PMCC3 I/C FROM SB2 CDG 31 34.781 3000 1 0.4 11.59 0.482 SB-3 OG TO TR-3 TJM 10 1.369 125 1 0.5 10.95 1.53 SB-3 I/C FROM SB1 NO RELAY 1.3694 SB-1 OG TO SB-3 TJM 10 1.369 400 1 0.5 3.42 2.75 SB-1 I/C OF SB-1 TJM 10 0.760 800 0.75 0.7 1.27 176 SB-1 I/C FROM 110kV Line ICM 21 0.076 75 0.75 0.8 1.35 127 SB-1 TIE TO TG-1 SG CDD 31 0.609 500 1.25 0.95 0.97 188 TG-1 TIE TO SB-1 CDD 31 0.609 500 1 0.65 1.22 89 TG-1 I/C FROM TG CDG 31 0.609 600 1 0.4 1.01 2.5
1 PMCC4 I/C FROM TR-4 CDG 31 34.963 3000 1 0.4 11.65 0.52 SB-3 OG TO TR-4 TJM 10 1.376 125 1 0.5 11.01 1.53 SB-3 I/C FROM SB-1 NO RELAY
Fault at SB-6 (3.3kV)
Fault at PMCC-1 (433V)
Fault at PMCC-3 (433V)
Fault at PMCC-4 (433V)
S.No SB No Description Relay Type Fault Current in kA
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
4 SB-1 OG TO SB-3 TJM 10 1.376 400 1 0.5 3.44 2.75 SB-1 I/C OF SB-1 TJM 10 0.764 800 0.75 0.7 1.27 176 SB-1 I/C FROM 110kV Line ICM 21 0.076 75 0.75 0.8 1.36 127 SB-1 TIE TO TG-1 SG CDD 31 0.764 500 1.25 0.95 1.22 188 TG-1 TIE TO SB-1 CDD 31 0.764 500 1 0.65 1.53 89 TG-1 I/C FROM TG CDG 31 0.612 600 1 0.4 1.02 2.5
1 PMCC-5 I/C FROM TR-5 CDG 31 34.645 3000 1 0.4 11.55 0.52 SB-3 OG TO TR-5 TJM 10 1.364 125 1 0.5 10.91 1.53 SB-3 I/C FROM SB-1 NO RELAY4 SB-1 OG TO SB-3 TJM 10 1.364 400 1 0.5 3.41 2.75 SB-1 I/C OF SB-1 TJM 10 0.757 800 0.75 0.7 1.26 176 SB-1 I/C FROM 110kV Line ICM 21 0.076 75 0.75 0.8 1.35 127 SB-1 TIE TO TG-1 SG CDD 31 0.757 500 1.25 0.95 1.21 188 TG-1 TIE TO SB-1 CDD 31 0.757 500 1 0.65 1.51 89 TG-1 I/C FROM TG CDG 31 0.606 600 1 0.4 1.01 2.5
1 PMCC-6 I/C FROM TR-6 CDG 31 8.736 600 1 0.3 14.56 0.352 SB-4 OG TO TR-6 TJM 10 0.344 25 0.5 0.5 27.51 1.13 SB-4 I/C FROM SB-1 NO RELAY4 SB-1 OG TO SB-4 TJM 10 0.344 500 1 0.7 0.69 Infinity5 SB-1 I/C OF SB-1 TJM 10 0.191 800 0.75 0.7 0.32 Infinity6 SB-1 I/C FROM 110kV Line ICM 21 0.019 75 0.75 0.8 0.34 Infinity7 SB-1 TIE TO TG-1 SG CDD 31 0.153 500 1.25 0.95 0.24 Infinity8 TG-1 TIE TO SB-1 CDD 31 0.153 500 1 0.65 0.31 Infinity9 TG-1 I/C FROM TG CDG 31 0.153 600 1 0.4 0.25 Infinity
1 PMCC-7 I/C FROM TR-7 CDG 31 28.205 2500 1 0.4 11.28 0.512 SB-4 OG TO TR-7 TJM 10 1.110 100 1 0.5 11.10 1.53 SB-4 I/C FROM SB-1 NO RELAY4 SB-1 OG TO SB-4 TJM 10 1.110 500 1 0.7 2.22 17
Fault at PMCC-5 (433V)
Fault at PMCC-6 (433V)
Fault at PMCC-7 (433V)
S.No SB No Description Relay Type Fault Current in kA
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
5 SB-1 I/C FOR SB-1 TJM 10 0.617 800 0.75 0.7 1.03 Infinity6 SB-1 I/C FROM 110kV Line ICM 21 0.062 75 0.75 0.8 1.10 Infinity7 SB-1 TIE TO TG-1 SG CDD 31 0.494 500 1.25 0.95 0.79 128 TG-1 TIE TO SB-1 CDD 31 0.494 500 1 0.65 0.99 89 TG-1 I/C FROM TG CDG 31 0.494 600 1 0.4 0.82 3
1 PMCC-8 I/C FROM TR-8 CDG 31 29.130 2500 1 0.3 11.65 0.382 SB-4 OG TO TR-7 TJM 10 1.147 100 1 0.5 11.47 1.53 SB-4 I/C FROM SB-1 NO RELAY4 SB-1 OG TO SB-4 TJM 10 1.147 500 1 0.7 2.29 175 SB-1 I/C FOR SB-1 TJM 10 0.637 800 0.75 0.7 1.06 Infinity6 SB-1 I/C FROM 110kV Line ICM 21 0.064 75 0.75 0.8 1.13 Infinity7 SB-1 TIE TO TG-1 SG CDD 31 0.510 500 1.25 0.95 0.82 18 TG-1 TIE TO SB-1 CDD 31 0.510 500 1 0.65 1.02 89 TG-1 I/C FROM TG CDG 31 0.510 600 1 0.4 0.85 3
1 PMCC-9 I/C FROM TR-9 CDG 31 28.431 2500 0.5 0.75 22.74 0.752 SB-4 OG TO TR-7 TJM 10 1.119 100 0.75 0.6 14.92 1.73 SB-4 I/C FROM SB-1 NO RELAY4 SB-1 OG TO SB-4 TJM 10 1.119 500 1 0.7 2.24 175 SB-1 I/C FOR SB-1 TJM 10 0.621 800 0.75 0.7 1.04 Infinity6 SB-1 I/C FROM 110kV Line ICM 21 0.062 75 0.75 0.8 1.10 Infinity7 SB-1 TIE TO TG-1 SG CDD 31 0.498 500 1.25 0.95 0.80 Infinity8 TG-1 TIE TO SB-1 CDD 31 0.498 500 1 0.65 1.00 89 TG-1 I/C FROM TG CDG 31 0.498 600 1 0.4 0.83 3
1 DCD-10 I/C FROM TR-10 CDG 31 28.243 2500 0.75 0.3 15.06 0.352 SB-4 OG TO TR-10 TJM 10 1.112 100 0.75 0.5 14.82 1.43 SB-4 I/C FROM SB-1 NO RELAY4 SB-1 OG TO SB-4 TJM 10 1.112 500 1 0.7 2.22 175 SB-1 I/C FOR SB-1 TJM 10 0.617 800 0.75 0.7 1.03 Infinity
Fault at DCD 10 (433V)
Fault at PMCC-8 (433V)
Fault at PMCC-9 (433V)
S.No SB No Description Relay Type Fault Current in kA
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
6 SB-1 I/C FROM 110kV Line ICM 21 0.062 75 0.75 0.8 1.10 Infinity7 SB-1 TIE TO TG-1 SG CDD 31 0.494 500 1.25 0.95 0.79 Infinity8 TG-1 TIE TO SB-1 CDD 31 0.494 500 1 0.65 0.99 89 TG-1 I/C FROM TG CDG 31 0.494 600 1 0.4 0.82 3
1 DCD-11 I/C FROM TR-11 CDG 31 28.393 2500 0.75 0.2 15.14 0.232 SB-4 OG TO TR-11 TJM 10 1.118 100 0.75 0.5 14.90 1.43 SB-4 I/C FROM SB-1 NO RELAY4 SB-1 OG TO SB-4 TJM 10 1.118 500 1 0.7 2.24 175 SB-1 I/C FOR SB-1 TJM 10 0.621 800 0.75 0.7 1.03 Infinity6 SB-1 I/C FROM 110kV Line ICM 21 0.062 75 0.75 0.8 1.10 Infinity7 SB-1 TIE TO TG-1 SG CDD 31 0.497 500 1.25 0.95 0.80 Infinity8 TG-1 TIE TO SB-1 CDD 31 0.497 500 1 0.65 0.99 89 TG-1 I/C FROM TG CDG 31 0.497 600 1 0.4 0.83 3
Fault at DCD 11 (433V)
S.No SB No Description Relay Type Fault Current in A
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
252-2 SB-1 OG TO SB-2 TJM 10 100 150 0.3 0.1 2.22 0.75252-1 SB-1 I/C FOR SB-1 MIT 161 100 800 0.075 0.15 1.67 2.05
SB-1 GT T/F NUTRAL MIT 161 100 100 0.6 0.15 1.67 2.05152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.75 0.2 1.78 2.30252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.1 0.15 2.00 1.51252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.1 0.15 2.00 1.51252-21 TG-1 I/C FROM TG CDG 31 100 600 0.1 0.4 1.67 1.80
252-8 SB-2 OG TO TR-1 NO RELAY252-7 SB-2 I/C FROM SB-1 TJM 10 100 150 0.3 0.1 2.22 0.75252-2 SB-1 OG TO SB-2 TJM 10 100 150 0.3 0.1 2.22 0.75252-1 SB-1 I/C FOR SB-1 MIT 161 100 800 0.075 0.15 1.67 2.05152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.75 0.2 1.78 2.30252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.1 0.15 2.00 1.51252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.1 0.15 2.00 1.51252-21 TG-1 I/C FROM TG CDG 31 100 600 0.1 0.45 1.67 1.80
252-10 SB-3 OG TO TR-2 TJM 10 100 100 0.5 0.1 2.00 0.90252-9 SB-3 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-3 MIT 161 100 400 0.125 0.125 2.00 1.25252-1 SB-1 I/C FOR SB-1 MIT 161 100 800 0.075 0.15 1.67 2.05152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.75 0.2 1.78 2.30252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.1 0.15 2.00 1.51252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.1 0.15 2.00 1.51
Fault at SB-3 (11kV)
3.2. Earth Fault Relay Settings3.2.1 Recommended Earth Fault Relay Settings
Fault at SB-1 (11kV)
Fault at SB-2 (11kV)
S.No SB No Description Relay Type Fault Current in A
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
252-21 TG-1 I/C FROM TG CDG 31 100 600 0.1 0.45 1.67 1.80
252-15 SB-4 OG TO TR-11 TJM 10 100 200 0.25 0.1 2.00 0.90252-14 SB-3 I/C FROM SB-1 NO RELAY252-5 SB-1 OG TO SB-4 MIT 161 100 500 0.1 0.125 2.00 1.25252-1 SB-1 I/C FOR SB-1 MIT 161 100 800 0.075 0.15 1.67 2.05152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.75 0.2 1.78 2.30252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.1 0.15 2.00 1.51252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.1 0.15 2.00 1.51252-21 TG-1 I/C FROM TG CDG 31 100 600 0.1 0.45 1.67 1.80
252-25 TG-1 OG TO AUX.TR-3 CDG 31 100 200 0.25 0.3 2.00 0.92252-21 TG-1 I/C FROM TG CDG 31 100 600 0.1 0.45 1.67 1.80252-1 SB-1 I/C FOR SB-1 MIT 161 100 800 0.075 0.15 1.67 2.05152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.75 0.2 1.78 2.30252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.1 0.15 2.00 1.51252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.1 0.15 2.00 1.51
352-1 SB-5 I/C FROM TR-2 TJM 10 100 200 0.25 0.1 2.00 0.90SB-5 TR-2 NUTRAL MIT 161 100 200 0.25 0.1 2.00 1.00
252-10 SB-3 OG TO TR-2 TJM 10 100 100 0.5 0.1 2.00 0.90252-9 SB-3 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-3 MIT 161 100 400 0.125 0.125 2.00 1.25252-1 SB-1 I/C FOR SB-1 MIT 161 100 800 0.075 0.15 1.67 2.05152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.75 0.2 1.78 2.30252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.1 0.15 2.00 1.51252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.1 0.15 2.00 1.51252-21 TG-1 I/C FROM TG CDG 31 100 600 0.1 0.45 1.67 1.80
Fault at SB-4 (11kV)
Fault at TG-1 (11kV)
Fault at SB-5 (3kV)
S.No SB No Description Relay Type Fault Current in A
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
352-2 SB-6 I/C FROM AUX.TR-3 CDG 31 100 500 0.1 0.1 2.00 0.26SB-6 AUX.TR NUTRAL MIT 161 100 500 0.1 0.075 2.00 0.75
252-25 SB-1 OG TO AUX.TR-3 CDG 31 100 200 0.25 0.3 2.00 0.92252-21 SB-1 I/C FROM TG CDG 31 100 600 0.1 0.45 1.67 1.80252-1 SB-1 I/C FOR SB-1 MIT 161 100 800 0.075 0.15 1.67 2.05152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.75 0.2 1.78 2.30252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.1 0.15 2.00 1.51252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.1 0.15 2.00 1.51
452-2 PMCC-2 I/C FROM AUX.TR-2 CDG 31 551 3000 0.1 0.1 1.84 0.29PMCC-2 AUX.TR NUTRAL MIT 161 551 3000 0.1 0.075 1.84 0.86
252-23 TG-1 OG TO AUX.TR-2 CDG 31 21.69 200 0.25 0.3 0.43 INFINITY252-21 TG-1 I/C FROM TG CDG 31 21.69 600 0.1 0.45 0.36 INFINITY252-1 SB-1 I/C FOR SB-1 MIT 161 21.69 800 0.075 0.15 0.36 INFINITY152-1 SB-1 I/C FROM 110kV Line ICM 21 21.69 75 0.75 0.2 0.39 INFINITY252-3 SB-1 TIE TO TG-1 SG MIT 161 21.69 500 0.1 0.15 0.43 INFINITY252-26 TG-1 TIE TO SB-1 MIT 161 21.69 500 0.1 0.15 0.43 INFINITY
452-11 PMCC1 I/C FROM SB2 CDG 31 750 4000 0.1 0.1 1.88 0.29PMCC1 TR-1 NUTRAL MIT 161 750 4000 0.1 0.075 1.88 0.83
252-8 SB-2 OG TO SB-2 NO RELAY252-7 SB-2 I/C FROM SB-1 TJM 10 29.52 150 0.3 0.1 0.66 INFINITY252-2 SB-1 OG TO SB-2 TJM 10 29.52 150 0.3 0.1 0.66 INFINITY252-1 SB-1 I/C FOR SB-1 MIT 161 29.52 800 0.075 0.15 0.49 INFINITY152-1 SB-1 I/C FROM 110kV Line ICM 21 29.52 75 0.75 0.2 0.52 INFINITY252-3 SB-1 TIE TO TG-1 SG MIT 161 29.52 500 0.1 0.15 0.59 INFINITY252-26 TG-1 TIE TO SB-1 MIT 161 29.52 500 0.1 0.15 0.59 INFINITY
Fault at TG PMCC-3(3.3kV)
Fault at TG-PMCC-2 (433V)
Fault at PMCC-1 (433V)
S.No SB No Description Relay Type Fault Current in A
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
252-21 TG-1 I/C FROM TG CDG 31 29.52 600 0.1 0.45 0.49 INFINITY
252-12 PMCC3 I/C FROM SB-3 CDG 31 652 3000 0.1 0.1 2.17 0.25PMCC3 TR-3 NUTRAL MIT 161 652 3000 0.1 0.075 2.17 0.67
252-11 SB-3 OG TO TR-3 TJM 10 25.67 125 0.4 0.1 0.51 INFINITY252-9 SB-3 I/C FROM SB1 NO RELAY 25.67252-4 SB-1 OG TO SB-3 MIT 161 25.67 400 0.125 0.125 0.51 INFINITY252-1 SB-1 I/C OF SB-1 MIT 161 25.67 800 0.075 0.15 0.43 INFINITY152-1 SB-1 I/C FROM 110kV Line ICM 21 25.67 75 0.75 0.2 0.46 INFINITY252-3 SB-1 TIE TO TG-1 SG MIT 161 25.67 500 0.1 0.15 0.51 INFINITY252-26 TG-1 TIE TO SB-1 MIT 161 25.67 500 0.1 0.15 0.51 INFINITY252-21 TG-1 I/C FROM TG CDG 31 25.67 600 0.1 0.45 0.43 INFINITY
452-13 PMCC4 I/C FROM TR-4 CDG 31 656 3000 0.1 0.1 2.19 0.24PMCC4 TR-4 NUTRAL MIT 161 656 3000 0.1 0.075 2.19 0.67
252-12 SB-3 OG TO TR-4 TJM 10 25.80 125 0.4 0.1 0.52 INFINITY252-9 SB-3 I/C FROM SB-1 NO RELAY 25.80252-4 SB-1 OG TO SB-3 MIT 161 25.80 400 0.125 0.125 0.52 INFINITY252-1 SB-1 I/C OF SB-1 MIT 161 25.80 800 0.075 0.15 0.43 INFINITY152-1 SB-1 I/C FROM 110kV Line ICM 21 25.80 75 0.75 0.2 0.46 INFINITY252-3 SB-1 TIE TO TG-1 SG MIT 161 25.80 500 0.1 0.15 0.52 INFINITY252-26 TG-1 TIE TO SB-1 MIT 161 25.80 500 0.1 0.15 0.52 INFINITY252-21 TG-1 I/C FROM TG CDG 31 25.80 600 0.1 0.45 0.43 INFINITY
452-14 PMCC-5 I/C FROM TR-5 CDG 31 650 3000 0.1 0.1 2.17 0.25PMCC-5 TR-5 NUTRAL MIT 161 649.56 3000 0.1 0.075 2.17 0.68
252-13 SB-3 OG TO TR-5 TJM 10 25.57 125 0.4 0.1 0.51 INFINITY252-9 SB-3 I/C FROM SB-1 NO RELAY 25.57
Fault at PMCC-4 (433V)
Fault at PMCC-5 (433V)
Fault at PMCC-3 (433V)
S.No SB No Description Relay Type Fault Current in A
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
252-4 SB-1 OG TO SB-3 MIT 161 25.57 400 0.125 0.125 0.51 INFINITY252-1 SB-1 I/C OF SB-1 MIT 161 25.57 800 0.075 0.15 0.43 INFINITY152-1 SB-1 I/C FROM 110kV Line ICM 21 25.57 75 0.75 0.2 0.45 INFINITY252-3 SB-1 TIE TO TG-1 SG MIT 161 25.57 500 0.1 0.15 0.51 INFINITY252-26 TG-1 TIE TO SB-1 MIT 161 25.57 500 0.1 0.15 0.51 INFINITY252-21 TG-1 I/C FROM TG CDG 31 25.57 600 0.1 0.45 0.43 INFINITY
452-20 PMCC-6 I/C FROM TR-6 CDG 31 164 600 0.1 0.1 2.73 0.20PMCC-6 TR-6 NUTRAL MIT 161 164 600 0.1 0.075 2.73 0.52
252-20 SB-4 OG TO TR-6 TJM 10 6.45 25 2 0.1 0.13 INFINITY252-9 SB-4 I/C FROM SB-1 NO RELAY 6.45252-4 SB-1 OG TO SB-4 MIT 161 6.45 500 0.1 0.125 0.13 INFINITY252-1 SB-1 I/C OF SB-1 MIT 161 6.45 800 0.075 0.15 0.11 INFINITY152-1 SB-1 I/C FROM 110kV Line ICM 21 6.45 75 0.75 0.2 0.11 INFINITY252-3 SB-1 TIE TO TG-1 SG MIT 161 6.45 500 0.1 0.15 0.13 INFINITY252-26 TG-1 TIE TO SB-1 MIT 161 6.45 500 0.1 0.15 0.13 INFINITY252-21 TG-1 I/C FROM TG CDG 31 6.45 600 0.1 0.45 0.11 INFINITY
452-19 PMCC-7 I/C FROM TR-7 CDG 31 529 2500 0.1 0.1 2.12 0.26PMCC-7 TR-7 NUTRAL MIT 161 529 2500 0.1 0.075 2.12 0.70
252-19 SB-4 OG TO TR-7 TJM 10 20.82 100 0.5 0.1 0.42 INFINITY252-9 SB-4 I/C FROM SB-1 NO RELAY 20.82252-4 SB-1 OG TO SB-4 MIT 161 20.82 500 0.1 0.125 0.42 INFINITY252-1 SB-1 I/C FOR SB-1 MIT 161 20.82 800 0.075 0.15 0.35 INFINITY152-1 SB-1 I/C FROM 110kV Line ICM 21 20.82 75 0.75 0.2 0.37 INFINITY252-3 SB-1 TIE TO TG-1 SG MIT 161 20.82 500 0.1 0.15 0.42 INFINITY252-26 TG-1 TIE TO SB-1 MIT 161 20.82 500 0.1 0.15 0.42 INFINITY252-21 TG-1 I/C FROM TG CDG 31 20.82 600 0.1 0.45 0.35 INFINITY
Fault at PMCC-6 (433V)
Fault at PMCC-7 (433V)
S.No SB No Description Relay Type Fault Current in A
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
452-18 PMCC-8 I/C FROM TR-8 CDG 31 546 2500 0.1 0.1 2.18 0.25PMCC-8 TR-8 NUTRAL MIT 161 546 2500 0.1 0.075 2.18 0.67
252-18 SB-4 OG TO TR-8 TJM 10 21.50 100 0.5 0.1 0.43 INFINITY252-9 SB-4 I/C FROM SB-1 NO RELAY 21.50252-4 SB-1 OG TO SB-4 MIT 161 21.50 500 0.1 0.125 0.43 INFINITY252-1 SB-1 I/C FOR SB-1 MIT 161 21.50 800 0.075 0.15 0.36 INFINITY152-1 SB-1 I/C FROM 110kV Line ICM 21 21.50 75 0.75 0.2 0.38 INFINITY252-3 SB-1 TIE TO TG-1 SG MIT 161 21.50 500 0.1 0.15 0.43 INFINITY252-26 TG-1 TIE TO SB-1 MIT 161 21.50 500 0.1 0.15 0.43 INFINITY252-21 TG-1 I/C FROM TG CDG 31 21.50 600 0.1 0.45 0.36 INFINITY
452-17 PMCC-9 I/C FROM TR-9 CDG 31 533 2500 0.1 0.1 2.13 0.26PMCC-9 TR-9 NUTRAL MIT 161 533 2500 0.1 0.075 2.13 0.69
252-17 SB-4 OG TO TR-9 TJM 10 20.98 100 0.5 0.1 0.42 INFINITY252-9 SB-4 I/C FROM SB-1 NO RELAY 20.98252-4 SB-1 OG TO SB-4 MIT 161 20.98 500 0.1 0.125 0.42 INFINITY252-1 SB-1 I/C FOR SB-1 MIT 161 20.98 800 0.075 0.15 0.35 INFINITY152-1 SB-1 I/C FROM 110kV Line ICM 21 20.98 75 0.75 0.2 0.37 INFINITY252-3 SB-1 TIE TO TG-1 SG MIT 161 20.98 500 0.1 0.15 0.42 INFINITY252-26 TG-1 TIE TO SB-1 MIT 161 20.98 500 0.1 0.15 0.42 INFINITY252-21 TG-1 I/C FROM TG CDG 31 20.98 600 0.1 0.45 0.35 INFINITY
452-16 DCD-10 I/C FROM TR-10 CDG 31 530 2500 0.1 0.1 2.12 0.26DCD-10 TR-10 NUTRAL MIT 161 530 2500 0.1 0.075 2.12 0.70
252-16 SB-4 OG TO TR-10 TJM 10 20.84 100 0.5 0.1 0.42 INFINITY252-9 SB-4 I/C FROM SB-1 NO RELAY 20.84
Fault at PMCC-9 (433V)
Fault at DCD 10 (433V)
Fault at PMCC-8 (433V)
S.No SB No Description Relay Type Fault Current in A
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
252-4 SB-1 OG TO SB-4 MIT 161 20.84 500 0.1 0.125 0.42 INFINITY252-1 SB-1 I/C FOR SB-1 MIT 161 20.84 800 0.075 0.15 0.35 INFINITY152-1 SB-1 I/C FROM 110kV Line ICM 21 20.84 75 0.75 0.2 0.37 INFINITY252-3 SB-1 TIE TO TG-1 SG MIT 161 20.84 500 0.1 0.15 0.42 INFINITY252-26 TG-1 TIE TO SB-1 MIT 161 20.84 500 0.1 0.15 0.42 INFINITY252-21 TG-1 I/C FROM TG CDG 31 20.84 600 0.1 0.45 0.35 INFINITY
452-15 DCD-11 I/C FROM TR-11 CDG 31 532 2500 0.1 0.1 2.13 0.26DCD-11 TR-11 NUTRAL MIT 161 532 2500 0.1 0.075 2.13 0.69
252-15 SB-4 OG TO TR-11 TJM 10 20.94 100 0.5 0.1 0.42 INFINITY252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 MIT 161 20.94 500 0.1 0.125 0.42 INFINITY252-1 SB-1 I/C FOR SB-1 MIT 161 20.94 800 0.075 0.15 0.35 INFINITY152-1 SB-1 I/C FROM 110kV Line ICM 21 20.94 75 0.75 0.2 0.37 INFINITY252-3 SB-1 TIE TO TG-1 SG MIT 161 20.94 500 0.1 0.15 0.42 INFINITY252-26 TG-1 TIE TO SB-1 MIT 161 20.94 500 0.1 0.15 0.42 INFINITY252-21 TG-1 I/C FROM TG CDG 31 20.94 600 0.1 0.45 0.35 INFINITY
Recommended relays and settings
Fault at DCD 11 (433V)
S.No SB No Description Relay Type Fault Current in A
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
252-2 SB-1 OG TO SB-2 TJM 10 100 150 0.1 0.2 6.67 0.75252-1 SB-1 I/C FOR SB-1 TJM 10 100 800 0.2 0.2 0.63 7152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.1 0.1 13.33 0.23252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.005 0.7 40.00 1.28252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.005 0.25 40.00 0.458252-21 TG-1 I/C FROM TG CDG 31 100 600 0.1 0.3 1.67 1.1
252-8 SB-2 OG TO TR-1 NO RELAY 100252-7 SB-2 I/C FROM SB-1 TJM 10 100 150 0.1 0.5 6.67 1.7252-2 SB-1 OG TO SB-2 TJM 10 100 150 0.1 0.2 6.67 0.75252-1 SB-1 I/C FOR SB-1 TJM 10 100 800 0.2 0.2 0.63 7152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.1 0.1 13.33 0.23252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.005 0.7 40.00 1.28252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.005 0.25 40.00 0.458252-21 TG-1 I/C FROM TG CDG 31 100 600 0.1 0.3 1.67 1.1
252-10 SB-3 OG TO TR-2 TJM 10 100 100 0.1 0.1 10.00 0.31252-9 SB-3 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-3 TJM 10 100 400 0.1 0.15 2.50 1252-1 SB-1 I/C FOR SB-1 TJM 10 100 800 0.2 0.2 0.63 7152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.1 0.1 13.33 0.27252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.005 0.7 40.00 1.28252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.005 0.25 40.00 0.458252-21 TG-1 I/C FROM TG CDG 31 100 200 0.1 0.3 5.00 0.5
252-15 SB-4 OG TO TR-11 TJM 10 100 100 0.2 0.5 5.00 0.43252-14 SB-3 I/C FROM SB-1 NO RELAY252-5 SB-1 OG TO SB-4 TJM 10 100 500 0.2 0.8 1.00 20252-1 SB-1 I/C FOR SB-1 TJM 10 100 800 0.2 0.2 0.63 7
3.2.2. Existing Earth Fault Relay Settings
Fault at SB-4 (11kV)
Fault at SB-1 (11kV)
Fault at SB-2 (11kV)
Fault at SB-3 (11kV)
S.No SB No Description Relay Type Fault Current in A
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.1 0.1 13.33 0.27252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.005 0.7 40.00 1.28252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.005 0.25 40.00 0.458252-21 TG-1 I/C FROM TG CDG 31 100 200 0.1 0.3 5.00 0.5
252-25 TG-1 OG TO AUX.TR-3 CDG 31 100 200 0.1 0.1 5.00 0.43252-21 TG-1 I/C FROM TG CDG 31 100 600 0.1 0.3 1.67 1.1252-1 SB-1 I/C FOR SB-1 TJM 10 100 800 0.2 0.2 0.63 7152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.1 0.1 13.33 0.27252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.005 0.7 40.00 1.28252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.005 0.25 40.00 0.458
352-1 SB-5 I/C FROM TR-2 TJM 10 100 200 0.1 0.1 5.00 0.43252-10 SB-3 OG TO TR-2 TJM 10 100 100 0.1 0.1 10.00 0.31252-9 SB-3 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-3 TJM 10 100 400 0.1 0.15 2.50 1252-1 SB-1 I/C FOR SB-1 TJM 10 100 800 0.2 0.2 0.63 7152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.1 0.1 13.33 0.27252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.005 0.7 40.00 1.28252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.005 0.25 40.00 0.458252-21 TG-1 I/C FROM TG CDG 31 100 600 0.1 0.3 1.67 1.1
352-2 SB-6 I/C FROM AUX.TR-3 CDG 31 100 500 0.1 0.1 2.00 0.26252-25 SB-1 OG TO AUX.TR-3 CDG 31 100 200 0.1 0.1 5.00 0.16252-21 SB-1 I/C FROM TG CDG 31 100 600 0.1 0.3 1.67 1.1252-1 SB-1 I/C FOR SB-1 TJM 10 100 800 0.2 0.2 0.63 7152-1 SB-1 I/C FROM 110kV Line ICM 21 100 75 0.1 0.1 13.33 0.27252-3 SB-1 TIE TO TG-1 SG MIT 161 100 500 0.005 0.7 40.00 1.28252-26 TG-1 TIE TO SB-1 MIT 161 100 500 0.005 0.25 40.00 0.458
Fault at SB-5 (3kV)
Fault at TG -PMCC-3 (3.3kV)
Fault at TG-1 (11kV)
S.No SB No Description Relay Type Fault Current in A
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
452-1 SB-4 I/C FROM AUX.TR-2 CDG 31 551 3000 0.1 0.1 1.84 0.28252-23 SB-3 OG TO AUX.TR-2 CDG 31 21.69 200 0.1 0.1 1.08 Infinity252-21 SB-1 I/C FROM TG CDG 31 21.69 600 0.1 0.3 0.36 Infinity252-1 SB-1 I/C FOR SB-1 TJM 10 21.69 800 0.2 0.2 0.14 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 21.69 75 0.1 0.1 2.89 0.55252-3 SB-1 TIE TO TG-1 SG MIT 161 21.69 500 0.005 0.7 8.68 2.22252-26 TG-1 TIE TO SB-1 MIT 161 21.69 500 0.005 0.25 8.68 0.793
452-11 PMCC1 I/C FROM SB2 CDG 31 750 4000 0.1 0.1 1.88 0.3252-7 SB-2 I/C FROM SB-1 TJM 10 29.52 150 0.1 0.5 1.97 1.7252-2 SB-1 OG TO SB-2 TJM 10 29.52 150 0.1 0.2 1.97 1.7252-1 SB-1 I/C FOR SB-1 TJM 10 29.52 800 0.2 0.2 0.18 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 29.52 75 0.1 0.1 3.94 0.45252-3 SB-1 TIE TO TG-1 SG MIT 161 29.52 500 0.005 0.7 11.81 1.937252-26 TG-1 TIE TO SB-1 MIT 161 29.52 500 0.005 0.25 11.81 0.692252-21 TG-1 I/C FROM TG CDG 31 29.52 600 0.1 0.3 0.49 Infinity
452-12 PMCC3 I/C FROM SB-3 CDG 31 652 3000 0.1 0.2 2.17 0.55252-11 SB-3 OG TO TR-3 TJM 10 25.67 125 0.1 0.2 2.05 1.7252-9 SB-3 I/C FROM SB1 NO RELAY252-4 SB-1 OG TO SB-3 TJM 10 25.67 400 0.1 0.15 0.64 Infinity252-1 SB-1 I/C OF SB-1 TJM 10 25.67 800 0.2 0.2 0.16 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 25.67 75 0.1 0.1 3.42 0.5252-3 SB-1 TIE TO TG-1 SG MIT 161 25.67 500 0.005 0.7 10.27 2.056252-26 TG-1 TIE TO SB-1 MIT 161 25.67 500 0.005 0.25 10.27 0.735252-21 TG-1 I/C FROM TG CDG 31 25.67 600 0.1 0.3 0.43 Infinity
452-13 PMCC4 I/C FROM TR-4 CDG 31 656 3000 0.1 0.1 2.19 0.27252-12 SB-3 OG TO TR-4 TJM 10 25.80 125 0.1 0.2 2.06 1.7
Fault at TG-PMCC-2 (433V)
Fault at PMCC-1 (433V)
Fault at PMCC-3 (433V)
Fault at PMCC-4 (433V)
S.No SB No Description Relay Type Fault Current in A
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
252-9 SB-3 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-3 TJM 10 25.80 400 0.1 0.15 0.65 Infinity252-1 SB-1 I/C OF SB-1 TJM 10 25.80 800 0.2 0.2 0.16 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 25.80 75 0.1 0.1 3.44 0.5252-3 SB-1 TIE TO TG-1 SG MIT 161 25.80 500 0.005 0.7 10.32 2.051252-26 TG-1 TIE TO SB-1 MIT 161 25.80 500 0.005 0.25 10.32 0.733252-21 TG-1 I/C FROM TG CDG 31 25.80 600 0.1 0.3 0.43 Infinity
452-14 PMCC-5 I/C FROM TR-5 CDG 31 650 3000 0.1 0.15 2.17 0.4252-13 SB-3 OG TO TR-5 TJM 10 25.57 125 0.1 0.2 2.05 1.7252-9 SB-3 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-3 TJM 10 25.57 400 0.1 0.15 0.64 Infinity252-1 SB-1 I/C OF SB-1 TJM 10 25.57 800 0.2 0.2 0.16 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 25.57 75 0.1 0.1 3.41 0.5252-3 SB-1 TIE TO TG-1 SG MIT 161 25.57 500 0.005 0.7 10.23 2.059252-26 TG-1 TIE TO SB-1 MIT 161 25.57 500 0.005 0.25 10.23 0.736252-21 TG-1 I/C FROM TG CDG 31 25.57 600 0.1 0.3 0.43 Infinity
452-20 PMCC-6 I/C FROM TR-6 NO RELAY 164 - - -252-20 SB-4 OG TO TR-6 TJM 10 6.45 25 0.1 0.1 2.58 0.7252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 6.45 500 0.2 0.8 0.06 Infinity252-1 SB-1 I/C OF SB-1 TJM 10 6.45 800 0.2 0.2 0.04 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 6.45 75 0.1 0.1 0.86 Infinity252-3 SB-1 TIE TO TG-1 SG MIT 161 6.45 500 0.005 0.7 2.58 5.124252-26 TG-1 TIE TO SB-1 MIT 161 6.45 500 0.005 0.25 2.58 1.83252-21 TG-1 I/C FROM TG CDG 31 6.45 600 0.1 0.3 0.11 Infinity
452-19 PMCC-7 I/C FROM TR-7 CDG 31 529 2500 0.1 0.1 2.12 0.26252-19 SB-4 OG TO TR-7 TJM 10 20.82 100 0.1 0.2 2.08 1.7252-9 SB-4 I/C FROM SB-1 NO RELAY
Fault at PMCC-5 (433V)
Fault at PMCC-6 (433V)
Fault at PMCC-7 (433V)
S.No SB No Description Relay Type Fault Current in A
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
252-4 SB-1 OG TO SB-4 TJM 10 20.82 500 0.2 0.8 0.21 Infinity252-1 SB-1 I/C FOR SB-1 TJM 10 20.82 800 0.2 0.2 0.13 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 20.82 75 0.1 0.1 2.78 0.52252-3 SB-1 TIE TO TG-1 SG MIT 161 20.82 500 0.005 0.7 8.33 2.264252-26 TG-1 TIE TO SB-1 MIT 161 20.82 500 0.005 0.25 8.33 0.809252-21 TG-1 I/C FROM TG CDG 31 20.82 600 0.1 0.3 0.35 Infinity
452-18 PMCC-8 I/C FROM TR-8 CDG 31 546 2500 0.1 0.1 2.18 0.26252-18 SB-4 OG TO TR-7 TJM 10 21.50 100 0.1 0.2 2.15 1.68252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 21.50 500 0.2 0.8 0.21 Infinity252-1 SB-1 I/C FOR SB-1 TJM 10 21.50 800 0.2 0.2 0.13 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 21.50 75 0.1 0.1 2.87 0.45252-3 SB-1 TIE TO TG-1 SG MIT 161 21.50 500 0.005 0.7 8.60 2.229252-26 TG-1 TIE TO SB-1 MIT 161 21.50 500 0.005 0.25 8.60 0.796252-21 TG-1 I/C FROM TG CDG 31 21.50 600 0.1 0.3 0.36 Infinity
452-17 PMCC-9 I/C FROM TR-9 CDG 31 533 2500 0.1 0.1 2.13 0.26252-17 SB-4 OG TO TR-7 TJM 10 20.98 100 0.1 0.2 2.10 1.7252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 20.98 500 0.2 0.8 0.21 Infinity252-1 SB-1 I/C FOR SB-1 TJM 10 20.98 800 0.2 0.2 0.13 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 20.98 75 0.1 0.1 2.80 0.45252-3 SB-1 TIE TO TG-1 SG MIT 161 20.98 500 0.005 0.7 8.39 2.255252-26 TG-1 TIE TO SB-1 MIT 161 20.98 500 0.005 0.25 8.39 0.806252-21 TG-1 I/C FROM TG CDG 31 20.98 600 0.1 0.3 0.35 Infinity
452-16 DCD-10 I/C FROM TR-10 CDG 31 530 2500 0.4 0.5 0.53 Infinity252-16 SB-4 OG TO TR-10 TJM 10 20.84 100 0.2 0.2 1.04 Infinity252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 20.84 500 0.2 0.8 0.21 Infinity252-1 SB-1 I/C FOR SB-1 TJM 10 20.84 800 0.2 0.2 0.13 Infinity
Fault at DCD 10 (433V)
Fault at PMCC-8 (433V)
Fault at PMCC-9 (433V)
S.No SB No Description Relay Type Fault Current in A
Primary Current in
CT(A)PS TMS I//Ipu Tripping
Time (Sec)
152-1 SB-1 I/C FROM 110kV Line ICM 21 20.84 75 0.1 0.1 2.78 0.45252-3 SB-1 TIE TO TG-1 SG MIT 161 20.84 500 0.005 0.7 8.34 2.262252-26 TG-1 TIE TO SB-1 MIT 161 20.84 500 0.005 0.25 8.34 0.808252-21 TG-1 I/C FROM TG CDG 31 20.84 600 0.1 0.3 0.35 Infinity
452-15 DCD-11 I/C FROM TR-11 CDG 31 532 2500 0.4 0.5 0.53 Infinity252-15 SB-4 OG TO TR-11 TJM 10 20.95 100 0.2 0.5 1.05 Infinity252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 20.95 500 0.2 0.8 0.21 Infinity252-1 SB-1 I/C FOR SB-1 TJM 10 20.94 800 0.2 0.2 0.13 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 20.94 75 0.1 0.1 2.79 0.45252-3 SB-1 TIE TO TG-1 SG MIT 161 20.94 500 0.005 0.7 8.38 2.257252-26 TG-1 TIE TO SB-1 MIT 161 20.94 500 0.005 0.25 8.38 0.806252-21 TG-1 I/C FROM TG CDG 31 20.94 600 0.1 0.3 0.35 Infinity
Fault at DCD 11 (433V)
4. COMPARISON OF EXISTING &RECOMMENDED SETTINGS
S.No SB No Description Relay TypePrimary
Current in CT(A)
PS TMS Tripping Time (Sec) PS TMS Tripping Time
(Sec)
252-2 SB-1 OG TO SB-2 TJM 10 150 1 0.5 1.2 1 0.3 0.67252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 2.1 1 0.4 1.5152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 2.4 1 0.85 2.4252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 1.3 1 0.7 0.96252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 0.84 1 0.7 0.96252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 0.58 1 0.85 1.25
252-8 SB-2 OG TO TR-1 NO RELAY252-7 SB-2 I/C FROM SB-1 TJM 10 150 0.5 0.5 1 1 0.3 0.67252-2 SB-1 OG TO SB-2 TJM 10 150 1 0.5 1.2 1 0.3 0.67252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 2.1 1 0.4 1.5152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 2.4 1 0.85 2.4252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 1.3 1 0.7 0.96252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 0.84 1 0.7 0.96252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 0.58 1 0.85 1.2
252-10 SB-3 OG TO TR-2 TJM 10 100 0.5 0.4 0.75 0.75 0.1 0.23252-9 SB-3 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-3 TJM 10 400 1 0.6 1.25 1 0.3 0.67252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 2.2 1 0.4 1.5152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 2.4 1 0.85 2.4252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 1.45 1 0.7 0.96252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 0.82 1 0.7 0.96252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 0.58 1 0.85 1.2
252-15 SB-4 OG TO TR-11 TJM 10 100 0.75 0.5 1 1 0.1 0.23252-14 SB-3 I/C FROM SB-1 NO RELAY252-5 SB-1 OG TO SB-4 TJM 10 500 1 0.7 1.7 1 0.3 0.7252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 2.1 1 0.4 1.5152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 2.4 1 0.85 2.4252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 1.45 1 0.7 0.98
4.1. Comparison of Existing & Recommended Settings - Over Current
Existing Service Settings ELSYTEC's Recommended SettingsFault at SB-1 (11kV)
Fault at SB-2 (11kV)
Fault at SB-3 (11kV)
Fault at SB-4 (11kV)
S.No SB No Description Relay TypePrimary
Current in CT(A)
PS TMS Tripping Time (Sec) PS TMS Tripping Time
(Sec)
Existing Service Settings ELSYTEC's Recommended Settings252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 0.82 1 0.7 0.98252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 0.58 1 0.85 1.3
252-25 TG-1 OG TO AUX.TR-3 CDG 31 200 1 0.55 0.55 1 0.3 0.31252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 2.3 1 0.85 1.15252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 2.1 1 0.4 1.5152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 2.4 1 0.85 2.4252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 1.3 1 0.7 0.88252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 0.84 1 0.7 0.88
352-1 SB-5 I/C FROM TR-2 TJM 10 200 1 0.3 0.75 1 0.1 0.26252-10 SB-3 OG TO TR-2 TJM 10 100 0.5 0.4 0.85 0.75 0.1 0.39252-9 SB-3 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-3 TJM 10 400 1 0.6 4.5 1 0.3 2.4252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 Infinity 1 0.4 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 Infinity 1 0.85 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 Infinity 1 0.7 Infinity252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 Infinity 1 0.7 Infinity252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 Infinity 1 0.85 Infinity
352-2 SB-6 I/C FROM AUX.TR-3 CDG 31 500 1 0.15 1 1 0.1 0.13252-25 TG-1 OG TO AUX.TR-3 CDG 31 200 1 0.5 0.79 1 0.3 0.42252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 Infinity 1 0.85 6252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 20 1 0.4 infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 Infinity 1 0.85 infinity252-3 TG-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 6 1 0.7 4252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 4 1 0.7 4
452-2 SB-4 I/C FROM AUX.TR-2 CDG 31 3000 1 0.15 0.18 1 0.1 0.13252-23 SB-3 OG TO AUX.TR-2 CDG 31 200 1 0.55 1.8 1 0.3 0.48252-21 SB-1 I/C FROM TG CDG 31 600 1 0.4 2.3 1 0.85 Infinity252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 13 1 0.4 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 3.2 1 0.85 Infinity
Fault at TG-1 (11kV)
Fault at SB-5 (3kV)
Fault at SB-6 (3.3kV)
Fault at TG-PMCC-2 (4+A114V)
S.No SB No Description Relay TypePrimary
Current in CT(A)
PS TMS Tripping Time (Sec) PS TMS Tripping Time
(Sec)
Existing Service Settings ELSYTEC's Recommended Settings252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 5 1 0.7 5252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 2.5 1 0.7 5
452-11 PMCC1 I/C FROM SB2 CDG 31 4000 0.5 0.3 0.31 1 0.15 0.18252-8 SB-2 I/C FROM SB-1 TJM 10 150 0.5 0.5 1 1 0.3 0.88252-7 SB-1 OG TO SB-2 TJM 10 150 1 0.5 1.2 1 0.3 0.88252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 2.1 1 0.4 12152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 2.4 1 0.85 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 1.3 1 0.7 5252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 0.84 1 0.7 5252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 0.58 1 0.85 7
252-12 PMCC3 I/C FROM SB2 CDG 31 3000 1 0.4 0.48 1 0.15 0.18252-11 SB-3 OG TO TR-3 TJM 10 125 1 0.5 1.5 1 0.1 0.31252-9 SB-3 I/C FROM SB1 NO RELAY252-4 SB-1 OG TO SB-3 TJM 10 400 1 0.5 2.7 1 0.3 2.6252-1 SB-1 I/C OF SB-1 TJM 10 800 0.75 0.7 17 1 0.4 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 12 1 0.85 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 18 1 0.7 4.5252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 8 1 0.7 4.5252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 2.5 1 0.85 6
452-13 PMCC4 I/C FROM TR-4 CDG 31 3000 1 0.4 0.5 1 0.15 0.18252-12 SB-3 OG TO TR-4 TJM 10 125 1 0.5 1.5 1 0.1 0.31252-9 SB-3 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-3 TJM 10 400 1 0.5 2.7 1 0.3 2.6252-1 SB-1 I/C OF SB-1 TJM 10 800 0.75 0.7 17 1 0.4 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 12 1 0.85 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 18 1 0.7 4.5252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 8 1 0.7 4.5252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 2.5 1 0.85 6
Fault at PMCC-1 (433V)
Fault at PMCC-3 (433V)
Fault at PMCC-4 (433V)
S.No SB No Description Relay TypePrimary
Current in CT(A)
PS TMS Tripping Time (Sec) PS TMS Tripping Time
(Sec)
Existing Service Settings ELSYTEC's Recommended Settings
452-14 PMCC-5 I/C FROM TR-5 CDG 31 3000 1 0.4 0.5 1 0.15 0.19252-13 SB-3 OG TO TR-5 TJM 10 125 1 0.5 1.5 1 0.1 0.31252-9 SB-3 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-3 TJM 10 400 1 0.5 2.7 1 0.3 2.6252-1 SB-1 I/C OF SB-1 TJM 10 800 0.75 0.7 17 1 0.4 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 12 1 0.85 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 18 1 0.7 4.5252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 8 1 0.7 4.5252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 2.5 1 0.85 6
452-20 PMCC-6 I/C FROM TR-6 CDG 31 600 1 0.3 0.35 1 0.15 0.15252-20 SB-4 OG TO TR-6 TJM 10 25 0.5 0.5 1.1 1 0.1 0.29252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 500 1 0.7 Infinity 1 0.3 Infinity252-1 SB-1 I/C OF SB-1 TJM 10 800 0.75 0.7 Infinity 1 0.4 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 Infinity 1 0.85 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 Infinity 1 0.7 Infinity252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 Infinity 1 0.7 Infinity252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 Infinity 1 0.85 Infinity
452-19 PMCC-7 I/C FROM TR-7 CDG 31 2500 1 0.4 0.51 1 0.15 0.18252-19 SB-4 OG TO TR-7 TJM 10 100 1 0.5 1.5 1 0.1 0.3252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 500 1 0.7 17 1 0.3 2.6252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 Infinity 1 0.4 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 Infinity 1 0.85 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 12 1 0.7 Infinity252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 8 1 0.7 Infinity252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 3 1 0.85 Infinity
452-18 PMCC-8 I/C FROM TR-8 CDG 31 2500 1 0.3 0.38 1 0.15 0.18252-18 SB-4 OG TO TR-7 TJM 10 100 1 0.5 1.5 1 0.1 0.3252-9 SB-4 I/C FROM SB-1 NO RELAY
Fault at PMCC-6 (433V)
Fault at PMCC-7 (433V)
Fault at PMCC-8 (433V)
Fault at PMCC-5 (433V)
S.No SB No Description Relay TypePrimary
Current in CT(A)
PS TMS Tripping Time (Sec) PS TMS Tripping Time
(Sec)
Existing Service Settings ELSYTEC's Recommended Settings252-4 SB-1 OG TO SB-4 TJM 10 500 1 0.7 17 1 0.3 2.6252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 Infinity 1 0.4 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 Infinity 1 0.85 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 1 1 0.7 Infinity252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 8 1 0.7 Infinity252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 3 1 0.85 Infinity
452-17 PMCC-9 I/C FROM TR-9 CDG 31 2500 0.5 0.75 0.75 1 0.15 0.18252-17 SB-4 OG TO TR-7 TJM 10 100 0.75 0.6 1.7 1 0.1 0.3252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 500 1 0.7 17 1 0.3 2.6252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 Infinity 1 0.4 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 Infinity 1 0.85 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 Infinity 1 0.7 Infinity252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 8 1 0.7 Infinity252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 3 1 0.85 Infinity
452-16 DCD-10 I/C FROM TR-10 CDG 31 2500 0.75 0.3 0.35 1 0.15 0.18252-16 SB-4 OG TO TR-10 TJM 10 100 0.75 0.5 1.4 1 0.1 0.3252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 500 1 0.7 17 1 0.3 2.6252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 Infinity 1 0.4 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 Infinity 1 0.85 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 Infinity 1 0.7 Infinity252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 8 1 0.7 Infinity252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 3 1 0.85 Infinity
452-15 DCD-11 I/C FROM TR-11 CDG 31 2500 0.75 0.2 0.23 1 0.15 0.18252-15 SB-4 OG TO TR-11 TJM 10 100 0.75 0.5 1.4 1 0.1 0.3252-9 SB-4 I/C FROM SB-1 NO RELAY252-4 SB-1 OG TO SB-4 TJM 10 500 1 0.7 17 1 0.3 2.6252-1 SB-1 I/C FOR SB-1 TJM 10 800 0.75 0.7 Infinity 1 0.4 Infinity152-1 SB-1 I/C FROM 110kV Line ICM 21 75 0.75 0.8 Infinity 1 0.85 Infinity252-3 SB-1 TIE TO TG-1 SG CDD 31 500 1.25 0.95 Infinity 1 0.7 Infinity252-26 TG-1 TIE TO SB-1 CDD 31 500 1 0.65 8 1 0.7 Infinity252-21 TG-1 I/C FROM TG CDG 31 600 1 0.4 3 1 0.85 Infinity
Fault at DCD 10 (433V)
Fault at DCD 11 (433V)
Fault at PMCC-9 (433V)
S.No SB No DescriptionPrimary
Current in CT(A)
Relay Type PS TMS Tripping Time (Sec) Relay Type PS TMS Tripping Time
(Sec)
252-2 SB-1 OG TO SB-2 150 TJM 10 0.1 0.2 0.75 TJM 10 0.3 0.1 0.75252-1 SB-1 I/C FOR SB-1 800 TJM 10 0.2 0.2 7 MIT 161 0.075 0.15 2.05
SB-1 GT T/F NUTRAL 100 - - - - MIT 161 0.6 0.15 2.05152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.23 ICM 21 0.75 0.2 2.30252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 1.28 MIT 161 0.1 0.15 1.51
252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.458 MIT 161 0.1 0.15 1.51252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 1.1 CDG 31 0.1 0.45 1.80
252-8 SB-2 OG TO TR-1 NO RELAY252-7 SB-2 I/C FROM SB-1 150 TJM 10 0.1 0.5 1.7 TJM 10 0.3 0.1 0.75252-2 SB-1 OG TO SB-2 150 TJM 10 0.1 0.2 0.75 TJM 10 0.3 0.1 0.75252-1 SB-1 I/C FOR SB-1 800 TJM 10 0.2 0.2 1.053 MIT 161 0.075 0.15 2.05152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.28 ICM 21 0.75 0.2 2.30252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 1.28 MIT 161 0.1 0.15 1.51
252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.458 MIT 161 0.1 0.15 1.51252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 1.3 CDG 31 0.1 0.45 1.80
252-10 SB-3 OG TO TR-2 100 TJM 10 0.1 0.1 0.31 TJM 10 0.5 0.1 0.90252-9 SB-3 I/C FROM SB-1 NO RELAY NO RELAY252-4 SB-1 OG TO SB-3 400 TJM 10 0.1 0.15 1 MIT 161 0.125 0.125 1.25252-1 SB-1 I/C FOR SB-1 800 TJM 10 0.2 0.2 7 MIT 161 0.075 0.15 2.05152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.27 ICM 21 0.75 0.2 2.30252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 1.28 MIT 161 0.1 0.15 1.51
252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.458 MIT 161 0.1 0.15 1.51252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 0.5 CDG 31 0.1 0.45 1.80
252-15 SB-4 OG TO TR-11 200 TJM 10 0.2 0.5 0.43 TJM 10 0.25 0.1 0.90252-14 SB-3 I/C FROM SB-1 NO RELAY NO RELAY252-5 SB-1 OG TO SB-4 500 TJM 10 0.2 0.8 20 MIT 161 0.1 0.125 1.25252-1 SB-1 I/C FOR SB-1 800 TJM 10 0.2 0.2 7 MIT 161 0.075 0.15 2.05152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.27 ICM 21 0.75 0.2 2.30252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 1.28 MIT 161 0.1 0.15 1.51
252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.458 MIT 161 0.1 0.15 1.51
Fault at SB-2 (11kV)
Fault at SB-3 (11kV)
Fault at SB-4 (11kV)
Fault at SB-1 (11kV)Existing Service Settings ELSYTEC Recommended Settings
4.2.Comparison of Existing and Recommended Settings - Earth Fault
S.No SB No DescriptionPrimary
Current in CT(A)
Relay Type PS TMS Tripping Time (Sec) Relay Type PS TMS Tripping Time
(Sec)
Existing Service Settings ELSYTEC Recommended Settings252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 0.5 CDG 31 0.1 0.45 1.80
252-25 TG-1 OG TO AUX.TR-3 200 CDG 31 0.1 0.1 0.16 CDG 31 0.25 0.3 0.92252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 1.3 CDG 31 0.1 0.45 1.80252-1 SB-1 I/C FOR SB-1 800 TJM 10 0.2 0.2 1.053 MIT 161 0.075 0.15 2.05152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.28 ICM 21 0.75 0.2 2.30252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 1.28 MIT 161 0.1 0.15 1.51
252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.458 MIT 161 0.1 0.15 1.51
352-1 SB-5 I/C FROM TR-2 200 TJM 10 0.1 0.1 0.43 TJM 10 0.25 0.1 0.90SB-5 TR-2 NUTRAL 200 MIT 161 - - - MIT 161 0.25 0.1 1.00
252-10 SB-3 OG TO TR-2 100 TJM 10 0.1 0.1 0.31 TJM 10 0.5 0.1 0.90252-9 SB-3 I/C FROM SB-1 NO RELAY NO RELAY252-4 SB-1 OG TO SB-3 400 MIT 161 0.1 0.15 1 MIT 161 0.125 0.125 1.25252-1 SB-1 I/C FOR SB-1 800 MIT 161 0.2 0.2 7 MIT 161 0.075 0.15 2.05152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.27 ICM 21 0.75 0.2 2.30252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 1.28 MIT 161 0.1 0.15 1.51
252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.458 MIT 161 0.1 0.15 1.51252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 1.1 CDG 31 0.1 0.45 1.80
352-2 SB-6 I/C FROM AUX.TR-3 500 CDG 31 0.1 0.1 0.26 CDG 31 0.1 0.1 0.26SB-6 AUX.TR NUTRAL 500 - - - MIT 161 0.1 0.075 0.75
252-25 SB-1 OG TO AUX.TR-3 200 CDG 31 0.1 0.1 0.16 CDG 31 0.25 0.3 0.92252-21 SB-1 I/C FROM TG 600 CDG 31 0.1 0.3 1.1 CDG 31 0.1 0.45 1.80252-1 SB-1 I/C FOR SB-1 800 TJM 10 0.2 0.2 7 MIT 161 0.075 0.15 2.05152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.27 ICM 21 0.75 0.2 2.30252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 1.28 MIT 161 0.1 0.15 1.51
252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.458 MIT 161 0.1 0.15 1.51
452-2 PMCC-2 I/C FROM AUX.TR-2 3000 CDG 31 0.1 0.1 0.28 CDG 31 0.1 0.1 0.29PMCC-2 AUX.TR NUTRAL 3000 - - - - MIT 161 0.1 0.075 0.86
252-23 TG-1 OG TO AUX.TR-2 200 CDG 31 0.1 0.1 Infinity CDG 31 0.25 0.3 INFINITY252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 Infinity CDG 31 0.1 0.45 INFINITY252-1 SB-1 I/C FOR SB-1 800 TJM 10 0.2 0.2 Infinity MIT 161 0.075 0.15 INFINITY
Fault at SB-5 (3kV)
Fault at TG PMCC-3(3.3kV)
Fault at TG-PMCC-2 (433V)
Fault at TG-1 (11kV)
S.No SB No DescriptionPrimary
Current in CT(A)
Relay Type PS TMS Tripping Time (Sec) Relay Type PS TMS Tripping Time
(Sec)
Existing Service Settings ELSYTEC Recommended Settings152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.55 ICM 21 0.75 0.2 INFINITY252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 2.22 MIT 161 0.1 0.15 INFINITY252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.793 MIT 161 0.1 0.15 INFINITY
452-11 PMCC1 I/C FROM SB2 4000 CDG 31 0.1 0.1 0.3 CDG 31 0.1 0.1 0.29PMCC1 TR-1 NUTRAL 4000 - - MIT 161 0.1 0.075 0.83
252-8 SB-2 OG TO SB-2 NO RELAY NO RELAY252-7 SB-2 I/C FROM SB-1 150 TJM 10 0.1 0.5 1.7 TJM 10 0.3 0.1 INFINITY252-2 SB-1 OG TO SB-2 150 TJM 10 0.1 0.2 1.7 TJM 10 0.3 0.1 INFINITY252-1 SB-1 I/C FOR SB-1 800 TJM 10 0.2 0.2 Infinity MIT 161 0.075 0.15 INFINITY152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.45 ICM 21 0.75 0.2 INFINITY252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 1.937 MIT 161 0.1 0.15 INFINITY252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.692 MIT 161 0.1 0.15 INFINITY252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 Infinity CDG 31 0.1 0.45 INFINITY
252-12 PMCC3 I/C FROM SB-3 3000 CDG 31 0.1 0.2 0.55 CDG 31 0.1 0.1 0.25PMCC3 TR-3 NUTRAL 3000 - - MIT 161 0.1 0.075 0.67
252-11 SB-3 OG TO TR-3 125 TJM 10 0.1 0.2 1.7 TJM 10 0.4 0.1 INFINITY252-9 SB-3 I/C FROM SB1 NO RELAY NO RELAY252-4 SB-1 OG TO SB-3 400 TJM 10 0.1 0.15 Infinity MIT 161 0.125 0.125 INFINITY252-1 SB-1 I/C OF SB-1 800 TJM 10 0.2 0.2 Infinity MIT 161 0.075 0.15 INFINITY152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.5 ICM 21 0.75 0.2 INFINITY252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 2.056 MIT 161 0.1 0.15 INFINITY252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.735 MIT 161 0.1 0.15 INFINITY252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 Infinity CDG 31 0.1 0.45 INFINITY
452-13 PMCC4 I/C FROM TR-4 3000 CDG 31 0.1 0.1 0.27 CDG 31 0.1 0.1 0.24PMCC4 TR-4 NUTRAL 3000 - - - MIT 161 0.1 0.075 0.67
252-12 SB-3 OG TO TR-4 125 TJM 10 0.1 0.2 1.7 TJM 10 0.4 0.1 INFINITY252-9 SB-3 I/C FROM SB-1 NO RELAY NO RELAY252-4 SB-1 OG TO SB-3 400 TJM 10 0.1 0.15 Infinity MIT 161 0.125 0.125 INFINITY252-1 SB-1 I/C OF SB-1 800 TJM 10 0.2 0.2 Infinity MIT 161 0.075 0.15 INFINITY152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.5 ICM 21 0.75 0.2 INFINITY252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 2.051 MIT 161 0.1 0.15 INFINITY
Fault at PMCC-3 (433V)
Fault at PMCC-4 (433V)
Fault at PMCC-1 (433V)
S.No SB No DescriptionPrimary
Current in CT(A)
Relay Type PS TMS Tripping Time (Sec) Relay Type PS TMS Tripping Time
(Sec)
Existing Service Settings ELSYTEC Recommended Settings252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.733 MIT 161 0.1 0.15 INFINITY252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 Infinity CDG 31 0.1 0.45 INFINITY
452-14 PMCC-5 I/C FROM TR-5 3000 CDG 31 0.1 0.15 0.4 CDG 31 0.1 0.1 0.25PMCC-5 TR-5 NUTRAL 3000 - - - - MIT 161 0.1 0.075 0.68
252-13 SB-3 OG TO TR-5 125 TJM 10 0.1 0.2 1.7 TJM 10 0.4 0.1 INFINITY252-9 SB-3 I/C FROM SB-1 NO RELAY NO RELAY252-4 SB-1 OG TO SB-3 400 TJM 10 0.1 0.15 Infinity MIT 161 0.125 0.125 INFINITY252-1 SB-1 I/C OF SB-1 800 TJM 10 0.2 0.2 Infinity MIT 161 0.075 0.15 INFINITY152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.5 ICM 21 0.75 0.2 INFINITY252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 2.059 MIT 161 0.1 0.15 INFINITY252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.736 MIT 161 0.1 0.15 INFINITY252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 Infinity CDG 31 0.1 0.45 INFINITY
452-20 PMCC-6 I/C FROM TR-6 600 CDG 31 0.1 0.35 CDG 31 0.1 0.1 0.20PMCC-6 TR-6 NUTRAL 600 - - - MIT 161 0.1 0.075 0.52
252-20 SB-4 OG TO TR-6 25 TJM 10 0.1 0.1 0.7 TJM 10 2 0.1 INFINITY252-9 SB-4 I/C FROM SB-1 NO RELAY NO RELAY252-4 SB-1 OG TO SB-4 500 TJM 10 0.2 0.8 Infinity MIT 161 0.1 0.125 INFINITY252-1 SB-1 I/C OF SB-1 800 TJM 10 0.2 0.2 Infinity MIT 161 0.075 0.15 INFINITY152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 Infinity ICM 21 0.75 0.2 INFINITY252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 5.124 MIT 161 0.1 0.15 INFINITY252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 1.83 MIT 161 0.1 0.15 INFINITY252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 Infinity CDG 31 0.1 0.45 INFINITY
452-19 PMCC-7 I/C FROM TR-7 2500 CDG 31 0.1 0.1 0.26 CDG 31 0.1 0.1 0.26PMCC-7 TR-7 NUTRAL 2500 - - - MIT 161 0.1 0.075 0.70
252-19 SB-4 OG TO TR-7 100 TJM 10 0.1 0.2 1.7 TJM 10 0.5 0.1 INFINITY252-9 SB-4 I/C FROM SB-1 NO RELAY NO RELAY252-4 SB-1 OG TO SB-4 500 TJM 10 0.2 0.8 Infinity MIT 161 0.1 0.125 INFINITY252-1 SB-1 I/C FOR SB-1 800 TJM 10 0.2 0.2 Infinity MIT 161 0.075 0.15 INFINITY152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.52 ICM 21 0.75 0.2 INFINITY252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 2.264 MIT 161 0.1 0.15 INFINITY252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.809 MIT 161 0.1 0.15 INFINITY252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 Infinity CDG 31 0.1 0.45 INFINITY
Fault at PMCC-6 (433V)
Fault at PMCC-7 (433V)
Fault at PMCC-5 (433V)
S.No SB No DescriptionPrimary
Current in CT(A)
Relay Type PS TMS Tripping Time (Sec) Relay Type PS TMS Tripping Time
(Sec)
Existing Service Settings ELSYTEC Recommended Settings
452-18 PMCC-8 I/C FROM TR-8 2500 CDG 31 0.1 0.1 0.26 CDG 31 0.1 0.1 0.25PMCC-8 TR-8 NUTRAL 2500 - - - - MIT 161 0.1 0.075 0.67
252-18 SB-4 OG TO TR-8 100 TJM 10 0.1 0.2 1.68 TJM 10 0.5 0.1 INFINITY252-9 SB-4 I/C FROM SB-1 NO RELAY NO RELAY252-4 SB-1 OG TO SB-4 500 TJM 10 0.2 0.8 Infinity MIT 161 0.1 0.125 INFINITY252-1 SB-1 I/C FOR SB-1 800 TJM 10 0.2 0.2 Infinity MIT 161 0.075 0.15 INFINITY152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.45 ICM 21 0.75 0.2 INFINITY252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 2.229 MIT 161 0.1 0.15 INFINITY252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.796 MIT 161 0.1 0.15 INFINITY252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 Infinity CDG 31 0.1 0.45 INFINITY
452-17 PMCC-9 I/C FROM TR-9 2500 CDG 31 0.1 0.1 0.26 CDG 31 0.1 0.1 0.26PMCC-9 TR-9 NUTRAL 2500 - - - MIT 161 0.1 0.075 0.69
252-17 SB-4 OG TO TR-9 100 TJM 10 0.1 0.2 1.7 TJM 10 0.5 0.1 INFINITY252-9 SB-4 I/C FROM SB-1 NO RELAY NO RELAY252-4 SB-1 OG TO SB-4 500 TJM 10 0.2 0.8 Infinity MIT 161 0.1 0.125 INFINITY252-1 SB-1 I/C FOR SB-1 800 TJM 10 0.2 0.2 Infinity MIT 161 0.075 0.15 INFINITY152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.45 ICM 21 0.75 0.2 INFINITY252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 2.255 MIT 161 0.1 0.15 INFINITY252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.806 MIT 161 0.1 0.15 INFINITY252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 Infinity CDG 31 0.1 0.45 INFINITY
452-16 DCD-10 I/C FROM TR-10 2500 CDG 31 0.4 0.5 Infinity CDG 31 0.1 0.1 0.26DCD-10 TR-10 NUTRAL 2500 - - - MIT 161 0.1 0.075 0.70
252-16 SB-4 OG TO TR-10 100 TJM 10 0.2 0.2 Infinity TJM 10 0.5 0.1 INFINITY252-9 SB-4 I/C FROM SB-1 NO RELAY NO RELAY252-4 SB-1 OG TO SB-4 500 TJM 10 0.2 0.8 Infinity MIT 161 0.1 0.125 INFINITY252-1 SB-1 I/C FOR SB-1 800 TJM 10 0.2 0.2 Infinity MIT 161 0.075 0.15 INFINITY152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.45 ICM 21 0.75 0.2 INFINITY252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 2.262 MIT 161 0.1 0.15 INFINITY252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.808 MIT 161 0.1 0.15 INFINITY252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 Infinity CDG 31 0.1 0.45 INFINITY
452-15 DCD-11 I/C FROM TR-11 2500 CDG 31 0.4 0.5 Infinity CDG 31 0.1 0.1 0.26Fault at DCD 11 (433V)
Fault at PMCC-8 (433V)
Fault at PMCC-9 (433V)
Fault at DCD 10 (433V)
S.No SB No DescriptionPrimary
Current in CT(A)
Relay Type PS TMS Tripping Time (Sec) Relay Type PS TMS Tripping Time
(Sec)
Existing Service Settings ELSYTEC Recommended SettingsDCD-11 TR-11 NUTRAL 2500 - - - MIT 161 0.1 0.075 0.69
252-15 SB-4 OG TO TR-11 100 TJM 10 0.2 0.5 Infinity TJM 10 0.5 0.1 INFINITY252-9 SB-4 I/C FROM SB-1 NO RELAY NO RELAY252-4 SB-1 OG TO SB-4 500 TJM 10 0.2 0.8 Infinity MIT 161 0.1 0.125 INFINITY252-1 SB-1 I/C FOR SB-1 800 TJM 10 0.2 0.2 Infinity MIT 161 0.075 0.15 INFINITY152-1 SB-1 I/C FROM 110kV Line 75 ICM 21 0.1 0.1 0.45 ICM 21 0.75 0.2 INFINITY252-3 SB-1 TIE TO TG-1 SG 500 MIT 161 0.005 0.7 2.257 MIT 161 0.1 0.15 INFINITY252-26 TG-1 TIE TO SB-1 500 MIT 161 0.005 0.25 0.806 MIT 161 0.1 0.15 INFINITY252-21 TG-1 I/C FROM TG 600 CDG 31 0.1 0.3 Infinity CDG 31 0.1 0.45 INFINITY
5. Proposed additional Relays recommended Relays to be procured & installed in all Transformer secondary neutral side at following places
1. GT 2. Tr-1 3. Tr-2 4. Tr-3 5. Tr-4 6. Tr-5 7. Tr-6 8. Tr-7 9. Tr-8 10. Tr-9 11. Tr-10 12. Tr-11 13. Aux.Tr-1 14. Aux.Tr-2 15. Aux.Tr-3 and also 252-1 Incoming from 10/12.5MVA Transformer 252-4 Outgoing to SB-3 from SB-1. 252-5 Outgoing to SB-4 from SB-1 252-3 Tie feeder from SB-1 to TG 252-26 Tie feeder from TG to SB-1 In the above places MIT 161 type of relays is recommended to installed and CT
ratios to match with LT side CT’s respective Breakers. (Refer 3.2.1.)
5. RECOMMENDED SETTINGS FOR OVER CURRENT &
EARTH FAULT
Device No Device Location Relay Type CT Ratio Plug Settings TMS
152-1 I/C FROM 110kV LINE ICM 21 75/1A 1 0.85252-1 I/C FOR SB-1 TJM 10 800/1A 1 0.4252-2 OG TO SB-2 FROM SB-1 TJM 10 150/1A 1 0.3252-3 TIE TO SB-1 TO TG1 CDD 31 500/1A 1 0.7252-4 OG TO SB-3 FROM SB-1 TJM 10 400/1A 1 0.3252-5 OG TO SB-4 FROM SB-1 TJM 10 500/1A 1 0.3252-7 I/C FROM SB-1 IN SB-2 TJM 10 150/1A 1 0.3252-8 OG TO TR-1 FROM SB-2 - - - -252-9 I/C FROM SB-1 IN SB-3 - - - -252-10 OG TO TR-2 FROM SB-3 TJM 10 100/1A 0.75 0.1252-11 OG TO TR-3 FROM SB-3 TJM 10 125/1A 1 0.1252-12 OG TO TR-4 FROM SB-3 TJM 10 125/1A 1 0.1252-13 OG TO TR-5 FROM SB-3 TJM 10 125/1A 1 0.1252-14 I/C FROM SB-1 IN SB-4 - - - -252-15 OG TO TR-11 FROM SB-4 TJM 10 100/1A 1 0.1252-16 OG TO TR-10 FROM SB-4 TJM 10 100/1A 1 0.1252-17 OG TO TR-9 FROM SB-4 TJM 10 100/1A 1 0.1252-18 OG TO TR-8 FROM SB-4 TJM 10 100/1A 1 0.1252-19 OG TO TR-7 FROM SB-4 TJM 10 100/1A 1 0.1252-20 OG TO TR-6 FROM SB-4 TJM 10 100/1A 1 0.1252-21 I/C FROM TG IN TG SG CDG 31 600/1A 1 0.85252-22 OG TO Aux.TR-1 FROM TG1 CDG 31 200/1A 1 0.3252-23 OG TO Aux.TR-2 FROM TG1 CDG 31 200/1A 1 0.3252-25 OG TO Aux.TR-3 FROM TG1 CDG 31 200/1A 1 0.3252-26 TIE TO TG1 TO SB-1 CDD 31 500/1A 1 0.7352-1 I/C FROM TR-2 IN SB-5 TJM 10 200/1A 1 0.1352-2 I/C FROM Aux.TR-3 IN TG PMCC-3 CDG 31 500/1A 1 0.1452-1 I/C FROM Aux.TR-1 IN TG PMCC-1 CDG 31 3000/1A 1 0.1452-2 I/C FROM Aux.TR-2 IN TG PMCC-2 CDG 31 3000/1A 1 0.1452-11 I/C FROM TR-1 IN PMCC-1 CDG 31 4000/1A 1 0.15452-12 I/C FROM TR-3 IN PMCC-3 CDG 31 3000/1A 1 0.15452-13 I/C FROM TR-4 IN PMCC-4 CDG 31 3000/1A 1 0.15452-14 I/C FROM TR-5 IN PMCC-5 CDG 31 3000/1A 1 0.15452-15 I/C FROM TR-11 IN DCD-11 CDG 31 2500/1A 1 0.15452-16 I/C FROM TR-10 IN DCD-10 CDG 31 2500/1A 1 0.15452-17 I/C FROM TR-9 IN PMCC-9 CDG 31 2500/1A 1 0.15452-18 I/C FROM TR-8 IN PMCC-8 CDG 31 2500/1A 1 0.15452-19 I/C FROM TR-7 IN PMCC-7 CDG 31 2500/1A 1 0.15452-20 I/C FROM TR-6 IN PMCC-6 CDG 31 600/1A 1 0.15
RECOMMENDED SETTINGS FOR OVER CURRENT
RECOMMENDED SETTINGS FOR OVER CURRENT AND EARTH FAULT BY ELSYTEC
49
Device No Device Location Relay Type CT RatioPlug
Settings TMS152-1 I/C FROM 110kV LINE ICM 21 75/1A 0.75 0.2252-1 I/C FOR SB-1 MIT 161 800/1A 0.075 0.15252-2 OG TO SB-2 FROM SB-1 TJM 10 150/1A 0.3 0.1252-3 TIE TO SB-1 TO TG1 MIT 161 500/1A 0.1 0.15252-4 OG TO SB-3 FROM SB-1 MIT 161 400/1A 0.125 0.125252-5 OG TO SB-4 FROM SB-1 MIT 161 500/1A 0.1 0.125252-7 I/C FROM SB-1 IN SB-2 TJM 10 150/1A 0.3 0.1252-8 OG TO TR-1 FROM SB-2 - - - -252-9 I/C FROM SB-1 IN SB-3 - - - -252-10 OG TO TR-2 FROM SB-3 TJM 10 100/1A 0.5 0.1252-11 OG TO TR-3 FROM SB-3 TJM 10 125/1A 0.4 0.1252-12 OG TO TR-4 FROM SB-3 TJM 10 125/1A 0.4 0.1252-13 OG TO TR-5 FROM SB-3 TJM 10 125/1A 0.4 0.1252-14 I/C FROM SB-1 IN SB-4 - - - -252-15 OG TO TR-11 FROM SB-4 TJM 10 100/1A 0.5 0.1252-16 OG TO TR-10 FROM SB-4 TJM 10 100/1A 0.5 0.1252-17 OG TO TR-9 FROM SB-4 TJM 10 100/1A 0.5 0.1252-18 OG TO TR-8 FROM SB-4 TJM 10 100/1A 0.5 0.1252-19 OG TO TR-7 FROM SB-4 TJM 10 100/1A 0.5 0.1252-20 OG TO TR-6 FROM SB-4 TJM 10 100/1A 2 0.1252-21 I/C FROM TG IN TG SG CDG 31 600/1A 0.1 0.45252-22 OG TO Aux.TR-1 FROM TG1 CDG 31 200/1A 0.25 0.3252-23 OG TO Aux.TR-2 FROM TG1 CDG 31 200/1A 0.25 0.3252-25 OG TO Aux.TR-3 FROM TG1 CDG 31 200/1A 0.25 0.3252-26 TIE TO TG1 TO SB-1 MIT 161 500/1A 0.1 0.15352-1 I/C FROM TR-2 IN SB-5 TJM 10 200/1A 0.5 0.1352-2 I/C FROM Aux.TR-3 IN TG PMCC-3 CDG 31 500/1A 0.1 0.1452-1 I/C FROM Aux.TR-1 IN TG PMCC-1 CDG 31 3000/1A 0.1 0.1452-2 I/C FROM Aux.TR-2 IN TG PMCC-2 CDG 31 3000/1A 0.1 0.1452-11 I/C FROM TR-1 IN PMCC-1 CDG 31 4000/1A 0.1 0.1452-12 I/C FROM TR-3 IN PMCC-3 CDG 31 3000/1A 0.1 0.1452-13 I/C FROM TR-4 IN PMCC-4 CDG 31 3000/1A 0.1 0.1452-14 I/C FROM TR-5 IN PMCC-5 CDG 31 3000/1A 0.1 0.1452-15 I/C FROM TR-11 IN DCD-11 CDG 31 2500/1A 0.1 0.1452-16 I/C FROM TR-10 IN DCD-10 CDG 31 2500/1A 0.1 0.1452-17 I/C FROM TR-9 IN PMCC-9 CDG 31 2500/1A 0.1 0.1452-18 I/C FROM TR-8 IN PMCC-8 CDG 31 2500/1A 0.1 0.1452-19 I/C FROM TR-7 IN PMCC-7 CDG 31 2500/1A 0.1 0.1452-20 I/C FROM TR-6 IN PMCC-6 CDG 31 600/1A 0.1 0.1
GT NEUTRAL MIT 161 100/1A 0.6 0.15TR-1 NEUTRAL MIT 161 4000/1A 0.1 0.075TR-2 NEUTRAL MIT 161 200/1A 0.25 0.1TR-3 NEUTRAL MIT 161 3000/1A 0.1 0.075TR-4 NEUTRAL MIT 161 3000/1A 0.1 0.075TR-5 NEUTRAL MIT 161 3000/1A 0.1 0.075TR-6 NEUTRAL MIT 161 600/1A 0.1 0.075TR-7 NEUTRAL MIT 161 2500/1A 0.1 0.075TR-8 NEUTRAL MIT 161 2500/1A 0.1 0.075TR-9 NEUTRAL MIT 161 2500/1A 0.1 0.075TR-10 NEUTRAL MIT 161 2500/1A 0.1 0.075TR-11 NEUTRAL MIT 161 2500/1A 0.1 0.075Aux.TR-1 NEUTRAL MIT 161 3000/1A 0.1 0.075Aux.TR-2 NEUTRAL MIT 161 3000/1A 0.1 0.075
RECOMMENDED SETTINGS FOR EARTH FAULT
50
Aux.TR-3 NEUTRAL MIT 161 500/1A 0.1 0.075
51