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MICOM P821
Breaker Failure Protection
Version V1.C
Technical Data Sheet P821/EN TDS/C13
This Document Should be Read Alongside the Technical Manual
ENHANCED PROTECTION WITHADVANCED NUMERICAL TECHNOLOGY
The MiCOM P821 is an Advanced Breaker Failurerelay based on the latest numerical technology. It offers a range of protection functions, combinedwith extensive monitoring capacities to give youoptimised efficiency and maximum control for yourelectrical schemes.
GREATER SECURITY
MiCOM P821's enhanced breaker failure protectionfunction provides you with back up protectionwhen the primary circuit fails to isolate the fault. This numerical relay is more than just a phasesegregated detection device for 1/3 pole trippingrelay for EHV/HV/MV levels, it is also suitable for allvoltage ranges.
ANY APPLICATIONANY TIMEANYWHERE
The P821 can use either single stage breakerfailure protection (tBF1), for back up protection tothe local circuit breaker; or it can use a 2 stagebreaker failure protection (tBF1 & tBF2). In 2 stageconfiguration, the first stage will be used to re-tripthe same circuit breaker, while the other stage willbe used to provide general tripping to the upstreamcircuit breaker.
Customer benefits
• Reliable phase segregated detection for 1/3 pole breaker tripping, suitable for all voltage levels
• Sensitive residual current detection
• Fast RESET time
• 1 or 2 stage CB failure
• Simple and easy to programme, standard MiCOM Px20 settingprocedure
T&D
MiCOM P821Breaker FailureProtection
PROTECTION
RECORDING
> Tripping statistic menu> Up to 75 events> Last 5 faults > 5 disturbance records :
32 samples/cycle, 3s duration.
PROTECTION FUNCTIONS
> Two stage CB Failure function (50BF)> Residual current detection (50BF (N))> Dead Zone Protection function (DBI)> Pole discrepancy function> Output relay latching features (86, Lockout)
BREAKER FAIL CHARACTERISTICS
> One independent timer per phase for stage one (3 times tBF1), single phase tripping orders
> One timer for second stage (tBF2),three phase tripping orders
> Measurement is insensitive to DC transient (avoiding undesired operation)
> Fast RESET time (12ms)> Configurable RESET Logic via digital Inputs
USER INTERFACE
> Display: 2 x 16 Alphanumeric characters, back-lit> LEDs: 8 including 4 programmable> Keyboard: 7 button tactile keypad
COMMUNICATION
> Front port: RS232 > Rear port: RS 485 , 2 wires, half duplex, isolated> Data rate: from 300 to 38400 bauds> Protocols:
Modbus RTU, Courier, IEC 60870-5-103, DNP3
CONTROL & SUPERVISION
> Monitoring the number of CB operation> Recording the sum of broken current quantity> Supervision of the local breaker
Closing & Opening times > Statistic Menu
MEASUREMENT
> Display of all measured quantities> All records time tagged to a 1ms resolution
Our policy is one of continuous development. Accordinglythe design of our products may change at any time. Whilstevery effort is made to produce up to date literature, thisbrochure should only be regarded as a guide and isintended for information purposes only. Its contents do notconstitute an offer for sale or advise on the application ofany product referred to in it. We cannot be held responsiblefor any reliance on any decisions taken on its contentswithout specific advice.
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AREVA T&D Worldwide Contact Centre:http://www.areva-td.com/contactcentre/Tel.: +44 (0) 1785 250 070
www.areva-td.com
Busbar
LogicInputs(5)
LogicOutputs(8)
SCADASystem
FrontpanelPC
Vaux
52
3PhaseCTs
EarthCT
Functions
CB FAIL 50BF (Ph), I <
50BF (N), IN <tBF1
tBF2DBI
Poles Not Together
tAUX86, Lockout
Metering
SOE
Oscillography
Comms
Comms
X
XX
XX
X
X
2
24
75
5 x 3 sec5
X
X
X
CB FAIL Earth
Stage 1 Timer
Stage 2 Timer
Dead Zone (End Zone)Pole discrepancyCircuit Breaker monitoring,control and statistics
Auxiliary timers
Latching output contacts
Setting groups
Measurement (True RMS)
Event records
Disturbance recordsFault records
RS 232 front communication
RS 485 rear communication
Common Names MiCOMP821
P821 Technical Data Sheet 1 P821/EN TDS/C13
Technical Data
Mechanical Specifications Design Modular MiCOM P821 relay in 20TE case. Mounting is front of panel flush mounting, or 19“ rack mounted (ordering options).
Enclosure Protection Per IEC 60529: 2001: IP 52 Protection (front panel) against dust and dripping water. IP 10 Protection for the rear.
Weight P821 (20TE): 1.7 Kg
Terminals
Rear Double fast on + M4 screw per connection. Full draw-out with automatic CT shorting in the case of the relay.
Front Port Serial PC Interface EIA(RS)232 DTE, 9 pin D-type female connector. MODBUS protocol for interface to MiCOM S1 software. Isolation to ELV level. Maximum cable length 15m.
Ratings
AC Measuring Inputs Nominal frequency: 50 and 60 Hz (settable) Operating range: 45 to 65Hz
AC Current Nominal current (In): 1 and 5 A dual rated. (1A and 5A inputs use different transformer tap connections, check correct terminals are wired). Nominal burden Phase < 0.025VA (1A) < 0.3VA (5A) Earth < 0.008VA at 0.1 Ιe (1A) < 0.01VA at 0.1 Ιe (5A) Thermal withstand: continuous 4 In for 2s: 40 In with 400A maximum for 1s; 100 In
Power Supply Auxiliary Voltage (Vx) Five ordering options: (i) Vx: 24 to 60 Vdc (ii) Vx: 48 to 150 Vdc (iii) Vx: 130 to 250 Vdc/100-250Vac, 50/60Hz (iv) Vx: 48 to 150 Vdc (ac immune) (v) Vx: 130 to 250 Vdc (ac immune)
Operating Range DC ±20% of Vx AC -20%, +10% of Vx Ripple Up to 12%
Nominal Burden 3W standby + 0.4W per energized relay +10mA per logic input 6VA standby + 0.4VA per energized relay + 10mA per logic input
Power Supply Interruption Per IEC 60255-11: 1979 The relay will withstand a 50ms interruption in the DC auxiliary supply, without de-energizing.
Logical Inputs Type: Optically insulated Burden: 10 mA per input Recognition time (DC): < 5ms
Logic Input Electrical Functionality
Ordering Code
Relay Auxiliary
Power Supply Range Vx
Auxiliary Voltage
Range For The Logic Inputs (*)
Max 0 level – min 1 level (Vdc)
Min Polaris. Current Level (mA)
A 24 - 60 Vdc 19 - 60 Vdc 9 - 15 3.35 mA
F 48 - 150 Vdc 32 - 150 Vdc 15 - 25 3.35 mA
H 125.-.250 Vdc 100 – 250 Vdc 105 – 145 Vdc 95 - 96 1.8 mA
M 130 - 250 Vdc 100 - 250 Vdc
48 - 250 Vdc 48 - 250 Vdc
15 - 38 15 - 38
2.20 mA 1.90 mA
T 48 - 150 Vdc Special ENA(**) 32 - 150 Vdc 15 - 25 3.35 mA
U 130 - 250 Vdc Special ENA(**) 48 - 250 Vdc 15 - 38 2.20 mA
V 48 – 150 Vdc 110 Vdc -30% / +20% 64 - 65 5 mA
W 130- 250 Vdc 110 – 250 Vac
220 Vdc -30% / +20% 132-133 2,5 mA
(*) The tolerance on the auxiliary voltage variations for the logic inputs is ±20% for DC voltage and -20%, +10% for AC voltage.
(**) Logic input recognition time for ENA assessment. Dedicated filtering on 24 samples (15ms at 50Hz).
P821 Technical Data Sheet 2 P821/EN TDS/C12
Output Contacts
Standard Contacts Contact relay: Dry contact Ag Cd O Make current: Max. 30A and carry for 3s Carry capacity: 5A continuous Rated voltage: 250VAC Breaking characteristic: Breaking capacity AC: 1250 VA resistive 1250 VA inductive (P.F = 0.5) 220 VAC, 5A (cos ϕ = 0.6) Breaking capacity DC: 135 VDC, 0.3A (L/R = 30 ms) 250 VDC, 50W resistive or 25W inductive (L/R=40ms) Operation time: <7ms Durability: Loaded contact: 10000 operation minimum Unloaded contact: 100000 operation minimum
Environmental Conditions
Recommended Ambient Temperature Range Per IEC 60255-6: 1988 Operating temperature range: -25°C to 55°C (or 13°F to 131°F). -25°C to 70°C (*) (or 13°F to 158°F (*)). Storage and transit: -25°C to 70°C (or 13°F to 158°F) (*) The upper limit is permissible for a single 6 hour duration within any 24 hour period.
Ambient Humidity Range Per IEC 60068-2-3: 1969: 56 days at 93% relative humidity and +40°C Per IEC 60068-2-30: 1980: Damp heat cyclic, six (12 + 12) hour cycles, 93% RH, +25 to +55°C
Solar Radiation Avoid exposure of the front panel to direct solar radiation.
Type Tests
Insulation Per IEC 60255-5: 2000, Insulation resistance > 100MΩ at 500Vdc (Using only electronic/brushless insulation tester).
High Voltage (Dielectric) Withstand EIA(RS)232 ports excepted. Per IEC 60255-5: 2000, 2 kV rms AC, 1 minute: Between all independent circuits.
Between independent circuits and case earth. 1kV rms AC for 1 minute, across open watchdog contacts. 1kV rms AC for 1 minute, across open contacts of changeover output relays.
Impulse Voltage Withstand Test Per IEC 60255-5: 2000 Front time: 1.2 µs, Time to half-value: 50 µs, Peak value: 5 kV, 0.5J Between all independent circuits. Between all independent circuits and case earth. Between the terminals of independent circuits. EIA(RS)232 & EIA(RS)485 ports and normally open contacts of output relays excepted.
Electromagnetic Compatibility (EMC)
1 MHz Burst High Frequency Disturbance Test Per IEC 60255-22-1: 1988, Class III, Common-mode test voltage: 2.5 kV, Differential test voltage: 1.0 kV, EIA(RS)232 ports excepted.
Immunity to Electrostatic Discharge Per IEC 60255-22-2: 1996, Class 4, 15kV discharge in air to user interface, display, and exposed metalwork. Per IEC 60255-22-2: 1996, Class 3, 8kV discharge in air to all communication ports. 6kV point contact discharge to any part of the front of the product.
Electrical Fast Transient or Burst Requirements Per IEC 60255-22-4: 2002. Test severity Class III and IV: Amplitude: 2 kV, burst frequency 5kHz (Class III), Amplitude: 4 kV, burst frequency 2.5kHz (Class IV). Applied directly to auxiliary supply, and applied to all other inputs. EIA(RS)232 ports excepted.
Surge Withstand Capability IEEE/ANSI C37.90.1: 2002: 4kV fast transient and 2.5kV oscillatory applied directly across each output contact, optically isolated input, and power supply circuit.
P821 Technical Data Sheet 3 P821/EN TDS/C13
Surge Immunity Test EIA(RS)232 ports excepted. Per IEC 61000-4-5: 1995 Levels 3 and 4 Level 4 - AC/DC PSU, CTs, input, output contacts. Level 3 - DC PSU, EIA(RS)485 rear protection communications channel.
Immunity to Radiated Electromagnetic Energy Per IEC 60255-22-3: 2000, Class III: Test field strength, frequency band 80 to 1000 MHz: 10 V/m, Test using AM: 1 kHz/80%, Spot tests at 80, 160, 450, 900 MHz
Radiated Immunity from Digital Communications Per EN61000-4-3: 2002, Level 4: Test field strength, frequency band 800 to 960 MHz, and 1.4 to 2.0 GHz: 30 V/m, Test using AM: 1 kHz/80%.
Radiated Immunity from Digital Radio Telephones PER IEC61000-4-3: 2002: 10 V/m, 900MHz and 1.89GHz.
Immunity to Conducted Disturbances Induced by Radio Frequency Fields Per IEC 61000-4-6: 2002, Level 3, Disturbing test voltage: 10 V
Power Frequency Magnetic Field Immunity Per IEC 61000-4-8: 1993, Level 5, 100A/m applied continuously, 1000A/m applied for 3s. Per IEC 61000-4-9: 1993, Level 5, 1000A/m applied in all planes. Per IEC 61000-4-10: 1993, Level 5, 100A/m applied in all planes at 100kHz/1MHz with a burst duration of 2s.
Conducted Emissions Per EN 55022: 1995, Class A: 0.15 - 0.5MHz, 79dBµV (quasi peak) 66dBµV (average) 0.5 - 30MHz, 73dBµV (quasi peak) 60dBµV (average).
Radiated Emissions Per EN 55022: 1995, Class A: 30 - 230MHz, 40dBµV/m at 10m measurement distance 230 - 1GHz, 47dBµV/m at 10m measurement distance.
EU Directives
EMC Compliance Per 89/336/EEC: Compliance to the European Commission Directive on EMC is claimed via the Standards route. Product Specific Standards were used to establish conformity: EN50263: 2000
Product Safety Per 73/23/EEC: Compliance with European Commission Low Voltage Directive. Compliance is demonstrated by reference to generic safety standards: EN61010-1: 2001 EN60950-1: 2001
73/23/EEC
Mechanical Robustness
Vibration Test Per IEC 60255-21-1: 1998 Response Class 2 Endurance Class 2
Shock and Bump Per IEC 60255-21-2: 1988 Shock response Class 2 Shock withstand Class 1 Bump Class 1
Seismic Test Per IEC 60255-21-3: 1993 Class 2
P821 Technical Data Sheet 4 P821/EN TDS/C12
Protection Functions Circuit breaker failure (Phase and Earth) by current residual detection Current threshold
I> 5% … 400% x rated current, Standard
Ie> 5% … 400% x rated current, Sensitive
Ie> 1% … 400% x rated current, Very sensitive
Ie> 0,2% … 80.0% x rated current, Threshold hysteresis
max. 0.008 In or 0.95 Is Hysteresis
90% with a minimum of 0.0125 In CB failure timer 1 (retrip)
tBF1 0 ms … 40 s; step of 5 ms CB failure timer 2 (backtrip)
tBF2 0 ms … 40 s; step of 5 ms Current reset time
15 ms at 50 Hz 12 ms at 60 Hz
Dead zone protection Current threshold
5% to 400% x rated current Dead Zone time
t_DZ 0 ms … 40 s; step of 5 ms Hysteresis
95% with a minimum of 0.005 In
Pole Discrepancy FONCTION Current threshold
5% … 400% x rated current Pole Discrepancy time
t_PD 0 ms to 40 s; step of 5 ms Hysteresis
95% with a minimum of 0.005 In
Automation Functions
Auxiliary timers Auxiliary timer numbers 2 independent
associated to the logic Inputs Aux 1and Aux 2
tAux1 and tAux2 Range 0 ms to 200 s ; step of 10 ms
Circuit breaker control and monitoring Setting Ranges Circuit breaker opening time (t Open Pulse)
50 ms to 1 s; step of 10 ms Circuit breaker closing time (t Close Pulse)
50 ms to 1 s; step of 10 ms Circuit breaker opening alarm threshold
0 to 50000 operations Amps or square amps alarm threshold
0 to 4 109; step of 106 Circuit breaker tripping time alarm threshold
100 ms to 5 s; step of 100 ms Circuit breaker closing time alarm threshold
100 ms to 5 s; step of 100 ms
P821 Technical Data Sheet 5 P821/EN TDS/C13
Recording Functions
Event recorder Capacity 75 events Time-tag to 1 millisecond Triggers
Any selected protection alarm and threshold Logic input change of state Self test events Setting changes
Fault recorder Capacity 5 faults Time-tag to 1 millisecond Triggers
Any selected protection alarm and threshold
Data Fault date Protection thresholds Setting Group AC inputs measurements (RMS) Fault magnitudes
Disturbance recorder Capacity
5 records of 3 s each Sampling rate
32 samples per frequency cycle Settings
Pre-time 100 ms to 3 s, step of 100 ms Post-time 100 ms to 3 s, step of 100 ms
Triggers Any selected protection alarm and threshold Logic input Remote command
Data AC input channels Digital input and output states Frequency value
Communications
Front port (RS232) Front port Communication Parameters
(Fixed)
Protocol Modbus RTU
Address To be specified in the « COMMUNICATIONS » menu of the relay
Messages format
IEC60870FT1.2
Baud rate 19200 bits/s
Parity Without
Stop bits 1
Data bits 8
Rear port (RS485)
Rear port settings
Setting options Setting available for:
Remote address
0 – 255 (step = 1) IEC / Kbus-Courier / Modbus RTU
Baud rate 9 600 or 19 200 bits/s
IEC
Baud rate 300, 600, 1200, 2400, 4800, 9600, 19 200 or 38 400 bits/s
Modbus
Baud rate 64000 bits/s Kbus
Parity “Even”, “Odd” or “Without”
Modbus RTU
Stop bits 0 or 1 or 2 Modbus RTU
Accuracy Breaker Fail Elements Deviation ± 2% Trigger DT: Is ± 2% Reset 0.95 Is ± 2% Time deviation ± 2% +20ms
Auxiliary Timers Time deviation ± 2% +10…20ms
Timers of Logic Functions Time deviation ± 2% +10…20ms
Autoreclosing Timers Time deviation ± 2% +10…20ms
P821 Technical Data Sheet 6 P821/EN TDS/C12
Guide Form Specification The breaker fail protection has to be of entirely numerical technology and in a 4U draw out metal case.
The following functions have to be available: > Dual rated phase current inputs
> Circuit Breaker Failure phase protection:
> Current reset time less than 15 ms
> 2 independent timers with thresholds hysteresis
> Circuit Breaker Failure earth protection:
> Current reset time less than 15 ms
> 2 independent timers with thresholds hysteresis
> Dead Zone protection:
> 1 threshold with hysteresis
> Pole Discrepancy function:
> 1 threshold with hysteresis
> Circuit Breaker Monitoring
> Programmable I/O
> Relay latching (ANSI 86 code)
> Display of true RMS values
> 2 setting groups
> An RS485 rear port compatible with the following protocols: MODBUS™, Courier, IEC 60870-5-103, DNP3.0
> Records of the last 75 events, time-stamped to 1ms
> Data records relating to the last 5 faults
> Disturbance recorder with storage of 5 records, each lasting 2.5 seconds, 32 samples per cycle
The user interface must include the following elements: > A 32-character alphanumeric back-lit LCD
display
> An RS232 front port compatible with application software and PC setting software
> Programmable LEDs with customised labelling
P821 Technical Data Sheet 7 P821/EN TDS/C13
CASE DIMENSIONS
9739
158168
49.5
Panel cut-out Flush mounting fixing details
Dimensionsin mm.
4 holes Ø 4.4 (M4 screw)
25.1 226
151.2 max.
Flush mountingP0395ENb
MiCOM
103
177
VA = 214.50 A
26
4 holes Ø 3.4
3926
Ala rme
Trip
Auxiliary supply
Equip. fail
AUX. 1
AUX. 3
AUX. 2
AUX. 4
P921
49.5
MiCOM P821 relay case dimensions (20TE case)
P821 Technical Data Sheet 8 P821/EN TDS/C12
CONNECTION DIAGRAMS 36
Auxi
liary
volta
ge
Progra
mm
able
input
Phase
rota
tion
CB
29
L3
CT
shortin
glin
ksm
ake
bef
ore
(b)and
(c)dis
connec
t
(3)Earth
term
inals
are
typic
alonly
(2)C
Tco
nnec
tion
are
typic
alonly
Nota
:(1
)
(c)
(a)
(b)
23
27
25
21
19
L5L4
Short
term
inals
bre
ak
bef
ore
(c)
Long
term
inals
last
rela
yto
be
connec
ted
(:
term
inatin
gre
sist
or
for
the
*
30
32
*31
Progra
mm
able
outp
ut
Progra
mm
able
trip
pin
g
Watc
hdog
(4)
outp
ut
34
P821
MiC
OM
26
17
28
24
22
L2L1
RL7
RL8
13
15
11
RL6
RL5RL4
RL2 RL3
RL1
5 971320
1810 8 16
141224
33
+ _W
D
6
35
Module
term
inalblo
cks
(with
inte
gra
lca
seea
rth
link)
view
edfrom
rear
Pins
term
inals
(pcb
type)
(d)
Alte
rnativ
e:
The
earth
curr
entin
putis
connec
ted
toth
eso
mm
atio
nofth
eth
ree
phase
CTs
.
Alte
rnativ
e:
Connec
tion
to2
phase
sC
Ts+
aco
rebala
nce
dC
T.
input
Progra
mm
able
input
Progra
mm
able
input
Progra
mm
able
input
Progra
mm
able
Progra
mm
able
outp
ut
Progra
mm
able
outp
ut
Progra
mm
able
outp
ut
Progra
mm
able
outp
ut
Progra
mm
able
outp
ut
Progra
mm
able
outp
ut
The
curr
entin
puts
are
connec
ted
to3
phase
CTs
+a
core
bala
nce
dC
T.
bet
wee
n30-3
2)
+ - + - + - + - + -
47
55
53
49
51
37 45
43
41
39
35
33
29
31
48
56
54
52
50
37
38
46
44
4240
36
34
32
30
24
23
27
25
28
262
1 21
19
15
17
13
22
20
16
18
14
7 9 1153
8 12
1064
A
CA B
S1S2
S2
P2P1
P2
S1
P1
5A
5A
5A
5A
1A
1A
48
47
46
45
44
43
42
41
56
55
54
52
53
1A
1A
50
51
49
CA B
P2
S2S1
P1
5A
48
5A
47
46
45
44
5A
5A
43
42
41
56
1A
1A
55
54
53
52
1A
51
1A
50
49
B CS2
AP2
P1P2
S1
S2S1
P1
41
5A
5A
43
42
1A
1A
56
55
54
1A
1A
53
52
51
50
49 45
48
5A
5A
47
46
44
EIA
RS4
85
Port
com
munic
atio
n
Com
munic
atio
nca
ble
shie
ld
_ +
Case
earth
connec
tion
Case
earth
External connections
P821 Technical Data Sheet 9 P821/EN TDS/C13
ORDERING INFORMATION
P 8 2 1 0 1
MiCOM Range Protection
P
Device Type MiCOM Breaker Fail Relay
8
Platform Px20 Platform
2
Model Standard (2 Ended)
1
E/F Current 0.1 – 40 ΙON A 0.01 – 8 ΙON B 0.002 – 1 ΙON C
Auxiliary Power Supply & Digital Input Voltage 24 – 60 Vdc & 24 – 60 Vdc A 48 – 150 Vdc & 48 – 150 Vdc F 130 – 250 Vdc / 110 – 250 Vac & 105 – 145 Vdc (Special application) H 130 – 250 Vdc/ 100 – 250 Vac & 130 – 250 Vdc / 100 – 250 Vac M 48 – 150 Vdc & 48 – 150 Vdc (AC Immune) T 130 – 250 Vdc / 110 – 250 Vac & 130 – 250 Vdc (AC Immune) U 48 – 150 Vdc & 110 Vdc – 30% / +20% (Special application) V 130 – 250 Vdc / 110 – 250 Vac & 220 Vdc – 30% / +20% (Special application) W
Communication Protocol MODBUS 1 K-BUS / COURIER 2 IEC60870-5-103 3 DNP3.0 4
Language French 0 English 1 Spanish 2 German 3 Italian 4 Russian 5 Polish 6 Portuguese – on request 7 Dutch – on request 8 Czech – on request 9 Hungarian – on request A Greek – on request B
Note : Please consult us for language availability
