Design Calculation 04-02-2011 R2_ELECTRICAL

SECTION-9

ELECTRICAL DESIGN CALCULATION

507

1.0 Formula Used:

1.1 Working Load in kVA = L. F.

1.2 System P. F. = P. F.

D. F.

Effi.

2.0

UnitTotal

(kW)Unit

Total

(kW)

2.1 280 0.946 0.85 0.9 1 3 840 2 504

Total Load 840 504

3.0 = 752.15 kVA

4.0 = 0.8041

5.0

5.1 = 1250 kVA

5.2 = 5 %

5.3 = 280 KW

5.4 = 3.3 kV

5.5 = 0.85

5.6 = 0.946

5.9 = 348.2153961 kVA

5.10 = 2089.292377 kVA

5.11 = 696.4307922 kVA

5.14 = 25000 kVA

(within 10%)S.C capacity of transformer

The selected rating of transformer is 1250 kVA

5.16Voltage drop at transformer terminal when largest

motor start with Star Delta starting= 4.2 %

[Motor Starting kVA (S/D) + Base Load kVA] x 100

S.C capacity of transformer 1.7321 x kV x I SC


motor start with DOL starting= 9.750031091 %

[Motor Starting kVA (DOL) + Base Load kVA] x 100(within 10%)

S.C capacity of transformer

5.13 Fault current of transformer secondary side (ISC) = 4.373741456 kAFault Level in MVA

1.7321 x kV

5.12 Fault Level at transformer secondary side = 25 MVARating of transformer in MVA x 100

Impedance of transformer in %

Base load on transformer before starting Second

largest motor (Considering only one motor is working and the Second motor is started)

Motor starting Kva with DOL start = 6 x 1.7321 x kV x I FLC

Motor starting Kva with Star Delta start = 3 x 1.7321 x kV x I FLC

5.8 Rating of largest size motor in kVA = 348.2153961 kVAkW

P.F x Efficiency

5.7 FLC of motor = 60.92016454 AkW x 1000

1.7321 x V x p.f x efficiency

Supply voltage System voltage

P.F of largest size motor From the above table

Efficiency of largest size motor From the above table

Calculation to check the starting of largest size motor

Rating of transformer assumed Nearest standard size (Confg. 33/3.3KV,Dyn11,Delta-star)

% impedance of transformer assumed From IS 2026

Rating of the largest size motor From the above table

626.79

Considering 20% contingency

System P. F.

D. F.

Connected Load Working Load Working Load

(kVA)

Pump 626.79

Sr.

No.Item Description

Rating in

kWEffi. P. F. L. F.

= Motor Efficiency

Input Data and Calculations:

TRANSFORMER SIZING FOR CWPS PLANT

[ Working Load (kW) x L. F. ] / [ D. F. x P. F. x Effi. ] = Load Factor

Total Working Load (kW) / Total Working Load (kVA) = Motor Power Factor

= Diversity Factor

508

CAPACITOR BANK SIZING ACROSS MOTOR TERMINAL

1 Motor rating (kW) 280

2 Motor rating after 90% load factor (kW) 252 To be considered for further calculations

3 Supply Voltage (V) 3300

4 Motor Power Factor (p.f 1) 0.85 Based on actual Values given by jyoti

5 Motor efficiency (Effi.) 0.946 Based on actual Values given by jyoti

6 Power Factor to be improved (p.f 2) 0.98

7 No load p.f. (p.f NL) 0.1 Assumption

8 Motor Full Load Current in amp.(FLC) 54.828 = (kW x 1000) / (1.7321 x V x cos(p.f 1) x Effi.)

9 No load current in amp. (INLC) 19.190 35% of FLC

10 Motor magnetising current in amp. 19.094 = [ INLC x sin(cos-1

p.f NL) ]

11 Capacitor current (Ic) 17.184 Shall be 90% of motor magnetising current

12Max. kVAR that can be connected across motor

terminal 98.22 = (1.7321 x V x Ic) / 1000

13Total kVAR to be connected across the motor

terminal105.00 = kW[ tan(cos

-1p.f 1) - tan(cos

-1p.f 2) ]

14Excess kVAR to be connected across the

switchgear bus bars (13 - 12)6.79

Negative value indicates capacitor bank is not

required across the bus.

Main Pumps For Clear water pumping station

509

1.0 Formula Used:



D. F.

Effi.

2.0

UnitTotal

(kW)Unit

Total

(kW)

a EOT crane 15 0.87 0.82 1 2 1 15 1 7.5

b Exhaust fan 0.5 0.67 0.82 1 1 8 4 8 4

c 15 0.8 0.8 1 1.5 Lumpsum 15 Lumpsum 10

d 1.5 0.79 0.81 0.9 1 2 3 2 2.7

e 7.5 0.87 0.82 0.9 1 2 15 2 13.5

f 160 0.962 0.86 0.9 2 2 320 1 72

g 37 0.935 0.86 0.9 2 2 74 1 16.65

h 1.1 0.79 0.81 0.9 2 2 2.2 1 0.495

i 1.1 0.77 0.81 0.9 1 2 2.2 1 0.99

j 3.7 0.77 0.82 0.9 1 2 7.4 1 3.33

k 1.5 0.79 0.81 1 2 3 4.5 3 2.25

l 1.5 0.79 0.81 1 2 3 4.5 3 2.25

m 1.5 0.79 0.81 1 2 3 4.5 3 2.25

n 1.5 0.79 0.81 1 1 2 3 1 1.5

o 1.5 0.79 0.81 1 1 2 3 1 1.5

p 1.5 0.79 0.81 1 1 2 3 1 1.5

q 0.5 0.67 0.82 0.9 2 30 15 30 6.75

r 7.5 0.87 0.82 0.9 1 1 7.5 1 6.75

s 40 0.902 0.81 1 1.5 Lumpsum 40 Lumpsum 26.666667

Total Load 542.8 182.58167

3.0 = 297.31 kVA

4.0 = 0.7369

5.0

5.1 = 315 kVA

5.2 = 4.5 %

5.3 = 160 KW

5.4 = 0.415 kV

5.5 = 0.86

5.6 = 0.962

5.9 = 121.6044578 kVA

5.10 = 1160.373253 kVA

5.11 = 386.7910845 kVA

5.14 = 7000 kVA

= Motor Efficiency


D. F.


(kVA)

TRANSFORMER SIZING FOR CWPS PLANT



= Diversity Factor

Sr.

No.Item Description

Rating in

kWEffi. P. F. L. F.

247.76


10.51

7.28

Flash mixture 4.22

Lighting (CWPS) 15.63

System P. F.


Rating of transformer assumed Nearest staanddard size (Confg. 33/0.433KV,Dyn11,Delta-star)






5.7 FLC of motor = 269.0452946 AkW x 1000



P.F x Efficiency

Base load on transformer before starting fourth

largest motor (Rating in kVA of transformer assumed - Largest motor KVA)



5.12 Fault Level at transformer secondary side = 7 MVARating of transformer in MVA x 100



1.7321 x kV











Clarifloculator mechanism phase-1 18.92

backwash pumps 87.03

Air blower 20.71

Chlorine booster pumps for prechlorination 0.77

Chlorine booster pumps for postchlorination 1.59

Service water pumps 5.27

Agitator for Alum dosing pump 3.52

Agitaotor for Lime dosing pump 3.52

Agitator for polyelectrolyte dosing tank 3.52

Dosing pump for alum 2.34

Dosing pump for lime 2.34

Dosing pump for polyelectrolyte 2.34

EOT crane 9.46

Lighting (chemical,Filter,pump,outdoor) 36.50

Valves 12.29

510

CAPACITOR BANK SIZING ACROSS BUS

Intermediate Pumping Station

1 Average Power factor (pf1) 0.737

2 Total Working load in IPS 210 kW

3 Power factor To be improved (pf2) 0.98

Total kVAR to be connected across Bus

4 Total kVAR to be connected across Bus 150 KVAR

Working load ( Tan ( Cos-1

pf1) - Tan (Cos-1

pf2))

511

Short circuit calculation CWPS main Pump

Assumptions

1 Fault level at 220kV bus 20000 MVA (as per IS :2026)

2 Base MVA 2000

Ratio = 220kV / 132kV

Capacity = 100.00 MVA

Z= 9.27%

Qty 1 Nos

Considering negative tolerance Z = 8.34%

Net Z for transformers single transformer= 8.34%

3



Z= 10.18%

Qty 1 Nos



4

Line length = 15 kM

Conductor Type = DOG Assumed

Conductor Resiatance = 0.2733 ohm/kM

Z,Considering Reactance Negligible = 4.0995 ohm

5

Ratio = 33kV / 3.3kV

Capacity = 1.25 MVA

Z= 5.0%

Qty 1 Nos



6 K' Constant for XLPE AL cable= 94

K' Constant for PVC AL cable= 75

K' Constant for PVC CU cable= 112

7 Fault clearing time for 33kV Breaker (t) = 1 Sec

Fault clearing time for 3.3kV Breaker (t) = 1 Sec

10 Starting Voltage dip = 15%

11 Starting current for DOL= 6 times

12 Starting current for Y-D= 2 times

13 Starting current for FCMA softstarter= 2.5 times

Transformer Details at Chandaka220KV/132KV

Transformer Details at Chandaka 132KV/33KV

33kV Over head line from Chandaka to CWPS

Transformer at CWPS

512

Calculation

a chandaka Grid Substation

220KV Bus 0.1 20000 52

220KV/132KV,100MVA transformer 1.7

1 132kV Bus 1.8 1130.8 5

2 132kV/33kV,40MVA transformer 4.6

3 33kV Bus 6.3 315.0 5.51 58.6

b CWPS

1 15 kM 33kV O/H line from Chandaka Substation to CWPS 7.53

2 33kV Bus 13.88 144.1 2.52 26.8

3

33kV , XLPE, cable 3core x 95sqmm cable from 6 Pole

structure to 33KV panel 0.03950

4 33kV panel 13.92 143.7 2.51 26.7

5

33kV , XLPE, cable 3core x 95sqmm cable from 33KV panel

to transformer 0.000987

6 33kV/3.3kV, 1.25MVA transformer 72.00

7 3.3kV side of 1.25MVA transformer 86.02 23.3 4.07 43.3

(XLPE,AL,3.3 kV)

8

3.3kV , XLPE, cable 3core x 300sqmm cable from

transformer secondary to CWPS PMCC 1.91

9 3.3kV CWPS PMCC Bus 87.83 22.8 3.98 42.4

(,AL,3.3 kV)

Sr No Description

Impedance "

Z"

Fault level

"MVA"

Fault Current

"kA"

Minimum Cable

size "SQMM"

513

A) FEEDER DATA

1 WORKING LOAD (KW)

2 WORKING LOAD (KVA) = 1250

2 VOLTAGE (V) = 3.3

3 PF = 0.8

4 FAULT CURRENT Ish = 4.07

5 FAULT CLEARING TIME t = 1

6 CONSTANT K = 94

7 LENGTH = 70

B) ��

1 AREA OF CONDUCTOR = Ish*�t/K

= 43.2978723

2 CABLE SIZE CHOSEN = 50 SQ.MM AL

(AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS

1 AMBIENT AIR TEMPERATURE = 45

RATING FACTOR = 0.95

2 GROUPING/SPACING WITH OTHER CABLES = Cable laid ground (3 cables touching)


3 OVERALL DERATING FACTOR = 0.6555

D) ��

1 FULL LOAD CURRENT Ifl = WORLING LOAD (KVA)/1.732 x VOLTAGE

= 218.70

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING = FULL LOAD CURRENT/DERATING FACTOR

333.64

3 Current carring capacity of 3C x300 Sqmm AL XLPE cable is = 360

4 No of cable required = 0.93

E) CHECK FOR VOLTAGE DROP

1 CABLE SIZE = 3C x300 Sqmm AL XLPE cable

2 R AT CONDUCTOR TEMP. (3C x 300SQmm AL XLPE Cable) = 0.13

3 X AT CONDUCTOR TEMP. (3C x 300SQmm AL XLPE Cable) = 0.072

4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.11827365

CABLE SIZE CHOSEN = 3CX300 sq.mm Al XLPE Cable

�� !�"��#$# ��%&"�'(��

(FULL LOAD CURRENT X LENGTH X

IMPEDENCE)/NO OF RUNS X VOLTAGE

514

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 3.3

3 PF = 0.8


5 FAULT CLEARING TIME t = 1

6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 42.34042553






2 GROUPING/SPACING WITH OTHER CABLES = Cable laid in trench (9 cables touching)



D) ��

1 FULL LOAD CURRENT Ifl = WORLING LOAD (KVA)/1.732 x VOLTAGE x 1.732

= 35.25


48.83

3 Current carring capacity of 3.5C x50 Sqmm AL XLPE cable is = 120




2 R AT CONDUCTOR TEMP. (3C x 50 SQmm AL XLPE Cable) = 0.82

3 X AT CONDUCTOR TEMP. (3C x 50 Qmm AL XLPE Cable) = 0.086

4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.052371797

CABLE SIZE CHOSEN = 3.5CX50 sq.mm Al XLPE Cable

#$# ��%&"�'(�� "��)� *�+�"��



515

Short circuit calculation CWPS Auxilary WTP load

Assumptions


2 Base MVA 2000



Z= 9.27%

Qty 1 Nos



3



Z= 10.18%

Qty 1 Nos



4

Line length = 15 kM




5


Capacity = 0.32 MVA

Z= 4.5%

Qty 1 Nos







Fault clearing time for 0.415kV ACB Breaker (t) = 0.08 Sec

Fault clearing time for 0.415kV MCCB Breaker (t) = 0.04 Sec



12 Starting current for Y-D= 3.5 times


Formula used

1

2

3 Zline =

4 Zcable =




Transformer at CWPS

Zsource =Base MVA

Fault level at 132kV bus

Ztransformer =Base MVA

X tranformer Z%Transformer capacity in MVA

Base MVAX Line Z

kV2

Base MVAX Cable Z

kV2

516

Calculation


1 220KV Bus 0.1 20000 52

2 220KV/132KV,100MVA transformer 1.7

3 132kV Bus 1.8 1130.8 5


5 33kV Bus 6.3 315.0 5.51

b CWPS

1 15 kM 33kV O/H line from Chandaka Substation to CWPS 7.53

2 33kV Bus 13.88 144.1 2.52 26.8

4 33kV/0.415kV, 315KVA transformer 257.14

5 0.415kV side of 315KVA transformer 271.02 7.4 10.27 30.9

(XLPE,AL,0.415kV)

6

0.415kV , XLPE, cable 2 X 3.5c x 240.sqmm cable from

transformer secondary to CWPS PMCC 40.66

7 0.415kV CWPS AUXILARY MCC 311.68 6.4 8.93 26.9

(,AL,0.415 kV)

8

0.415kV , XLPE, cable 2 x 3.5core x 120sqmm cable from

CWPS PMCC to Motor (160KW) 81.31

9 0.415kV 160KW motor (194) 392.99 5.1 7.08 15.1

(,AL,0.415 kV)

10

0.415kV , XLPE, cable 3.5C x 240sqmm cable from CWPS

PMCC to WTP & Chemical 508.19

11 0.415kV WTP & Chemical 819.87 2.4 3.39 7.2

(,AL,0.415 kV)

Sr No Description

Impedance "

Z"

Fault level

"MVA"

Fault Current

"kA"

Minimum Cable

size "SQMM"

517

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8


5 FAULT CLEARING TIME t = 0.08

6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 30.90207082






2 GROUPING/SPACING WITH OTHER CABLES = Cable directly burried (3 cables touching)



D) ��


= 438.24


668.56




1 CABLE SIZE = 3.5C x240 Sqmm AL XLPE cable

2 R AT CONDUCTOR TEMP. (3.5C x 240 SQmm AL XLPE Cable) = 0.16

3 X AT CONDUCTOR TEMP. (3.5C x 240 Qmm AL XLPE Cable) = 0.071

4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 2

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.624055741

CABLE SIZE CHOSEN = 2X3.5CX240 sq.mm Al XLPE Cable

"��"��*,��-�+��

(FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO

OF RUNS X VOLTAGE

518

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 19









D) ��


= 155.83


248.54







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.785433685

CABLE SIZE CHOSEN = 2X3CX120 sq.mm Al XLPE Cable

��*,��-�+��"��.� *��"��



519

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 19









D) ��


= 36.95


58.93







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.789742459


��*,��-�+��"��#/ *��"��



520

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 250

B) ��


= 19









D) ��


= 126.60


193.14






3 X AT CONDUCTOR TEMP. (3.5C x 300Qmm AL XLPE Cable) = 0.0705

4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.911409493


��+�*,��-�+��"��*�,��+��



521

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 120

B) ��


= 7.212765957









D) ��


= 27.82


54.24







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.302918856


��*�,�� '��&��0�+��"��,1�



522

A) FEEDER DATA

1 WORKING LOAD (KW) 5.6


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 120

B) ��


= 7.212765957









D) ��


= 9.74


18.98





2 R AT CONDUCTOR TEMP. (4C x16 SQmm AL XLPE Cable) = 2.44

3 X AT CONDUCTOR TEMP. (4C x16 Qmm AL XLPE Cable) = 0.0837

4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.976550907


��*�,�� '��&��0�+��"��,1�



523

A) FEEDER DATA

1 WORKING LOAD (KW) 12


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 105

B) ��


= 7.212765957









D) ��


= 20.87


40.68





2 R AT CONDUCTOR TEMP. (4C x16 SQmm AL XLPE Cable) = 2.44

3 X AT CONDUCTOR TEMP. (4C x16 Qmm AL XLPE Cable) = 0.0837

4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.831032951


��*�,�� '��&��0�+��"��,1#



524

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 25

B) ��


= 19









D) ��


= 104.34


166.42

Considering 35% extra current 224.66







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.276701989


��*,��23&0��!�+��"��/� ��4��&"��



525

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 25

B) ��


= 9.297701931






2 GROUPING/SPACING WITH OTHER CABLES = Cable laid in ground (3 cables touching)



D) ��


= 139.12


212.24







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.438263899


�� !"��#



526

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 45

B) ��


= 7.943667669








3 OVERALL DERATING FACTOR 0.627

D) ��


= 40.35


64.35




1 CABLE SIZE = 3C x16Sqmm AL XLPE cable



4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.515823138


��$�� !"��#��%% &��



527

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 55

B) ��


= 7.943667669









D) ��


= 22.26


35.50







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.636204732


��$�� !"��#�� &��



528

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 35

B) ��


= 7.943667669









D) ��


= 27.82


44.38








4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.301526492


��$�� !"��#��%� �� '� ��



529

A) FEEDER DATA


2 WORKING LOAD (KVA) = 12.5

2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 30

B) ��


= 7.943667669









D) ��


= 17.39


27.74







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.697246335


��$�� !"��#��



530

1.0 Formula Used:



D. F.

Effi.

2.0

UnitTotal

(kW)Unit

Total

(kW)

2.1 22 0.917 0.83 0.9 1 2 44 1 19.8

2.2 11 0.892 0.81 0.9 1 2 22 2 19.8

2.3 2 0.83 0.82 1 2 1 2 1 1

2.4 0.5 0.67 0.82 1 1 6 3 6 3

2.5 10 0.8 0.8 1 1.5 Lumpsum 10 Lumpsum 6.6666667

81 50.266667

3.0 = 84.92 kVA

4.0 = 0.71

5.0

5.1 = 100 kVA

5.2 = 4.5 %

5.3 = 22 KW

5.4 = 0.415 kV

5.5 = 0.83

5.6 = 0.917

5.9 = 71.095 kVA

5.10 = 173.43 kVA

5.11 = 101.17 kVA

5.14 = 2222.2 kVA

TRANSFORMER SIZING FOR JATNI (KAJU PLANTATION) PUMPING STATION


Lighting 10.42

5.46

1.47

Sr.

No.L. F. D. F.




System P. F.

= Diversity Factor

= Motor Efficiency

Item DescriptionRating in

kWEffi.

Working Load

(kVA)

Connected Load Working Load


P. F.

Total Load

Chain pully

Exhaust Fan

70.77

Pump-1 26.01

Pump-2 27.40







5.7 FLC of motor = 40.212 AkW x 1000


Motor starting Kva with Star-Delta start = 3 x 1.7321 x kV x I FLC


P.F x Efficiency




5.13 Fault current of transformer secondary side (ISC) = 3.0915

5.12 Fault Level at transformer secondary side = 2.2222


MVARating of transformer in MVA x 100


kAFault Level in MVA

1.7321 x kV






%[Motor Starting kVA (S/D) + Base Load kVA] x 100



motor start with Star-Delta starting= 7.8

531



2 Total Working load 50 kW





pf1) - Tan (Cos-1

pf2))

532

1.0 Formula Used:



D. F.

Effi.

2.0

UnitTotal

(kW)Unit

Total

(kW)

2.1 22 0.917 0.83 0.9 1 2 44 1 19.8

2.2 11 0.892 0.81 0.9 1 2 22 2 19.8

2.3 2 0.83 0.82 1 2 1 2 1 1

2.4 0.5 0.67 0.82 1 1 6 3 6 3

2.5 10 0.8 0.8 1 1.5 Lumpsum 10 Lumpsum 6.6666667

81 50.266667

3.0 = 84.92 kVA

4.0 = 0.71

5.0

5.1 = 100 kVA

5.2 = 4.5 %

5.3 = 22 KW

5.4 = 0.415 kV

5.5 = 0.83

5.6 = 0.917

5.9 = 71.095 kVA

5.10 = 173.43 kVA

5.11 = 101.17 kVA

5.14 = 2222.2 kVA

TRANSFORMER SIZING FOR JATNI (KAJU PLANTATION) PUMPING STATION


Lighting 10.42

5.46

1.47

Sr.

No.L. F. D. F.




System P. F.

= Diversity Factor

= Motor Efficiency


kWEffi.

Working Load

(kVA)



P. F.

Total Load

Chain pully

Exhaust Fan

70.77

Pump-1 26.01

Pump-2 27.40







5.7 FLC of motor = 40.212 AkW x 1000




P.F x Efficiency










1.7321 x kV










533








pf1) - Tan (Cos-1

pf2))

534

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 25

B) ��


= 9.297701931









D) ��


= 139.12


212.24







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.438263899


�� !"��#



535

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 45

B) ��


= 7.943667669








3 OVERALL DERATING FACTOR 0.627

D) ��


= 40.35


64.35







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.515823138


��$�� !"��#��%% &��



536

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 55

B) ��


= 7.943667669









D) ��


= 22.26


35.50







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.636204732


��$�� !"��#�� &��



537

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 35

B) ��


= 7.943667669









D) ��


= 27.82


44.38








4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.301526492


��$�� !"��#��%� �� '� ��



538

A) FEEDER DATA



2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 30

B) ��


= 7.943667669









D) ��


= 17.39


27.74







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.697246335


��$�� !"��#��



539

1.0 Formula Used:



D. F.

Effi.

2.0

UnitTotal

(kW)Unit

Total

(kW)

2.1 45 0.936 0.86 0.9 1 2 90 1 40.5

2.2 2.5 0.83 0.82 1 1 1 2.5 1 2.5

2.3 8 0.8 0.8 1 1.3 Lumpsum 8 Lumpsum 6.1538462

2.4 0.5 0.67 0.82 1 1 6 3 6 3

103.5 52.153846

3.0 = 82.87 kVA

4.0 = 0.76

5.0

5.1 = 100 kVA

5.2 = 4.5 %

5.3 = 45 KW

5.4 = 0.415 kV

5.5 = 0.86

5.6 = 0.936

5.9 = 44.097 kVA

5.10 = 335.42 kVA

5.11 = 111.81 kVA

5.14 = 2222.2 kVA










2.2222





1.7321 x kV

(Rating in kVA of transformer assumed - Largest motor KVA)



5.12 Fault Level at transformer secondary side =



P.F x Efficiency


largest motor

5.7 FLC of motor = 77.771 AkW x 1000





9.62

Pump (existing)





System P. F.

= Diversity Factor

= Motor Efficiency


kWEffi.

Working Load

(kVA)



D. F.


P. F.


Total Load 69.06

Lighting

TRANSFORMER SIZING FOR JATNI (PHED Transmission) PUMPING STATION


5.46Exhaust Fan (existing)

3.67Chain pully (existing)

50.31

Sr.

No.L. F.

540








pf1) - Tan (Cos-1

pf2))

541

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 60

B) ��


= 9.297701931









D) ��


= 139.12


212.24







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.051833358


�� !"#��$�



542

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 9.297701931









D) ��


= 77.91


124.26







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.911737553


�� !"#��$��%& '��



543

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 9.297701931









D) ��


= 27.82


44.38








4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.487458847


�� !"#��$��(� ��!�)�!��



544

A) FEEDER DATA



2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 9.297701931









D) ��


= 26.09


41.60







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.394492669


�� !"#��$��



545








pf1) - Tan (Cos-1

pf2))

546

1.0 Formula Used:



D. F.

Effi.

2.0

UnitTotal

(kW)Unit

Total

(kW)

2.1 37 0.935 0.86 0.9 1 2 74 1 33.3

2.2 18.5 0.913 0.83 0.9 1 2 37 2 33.3

2.3 2.5 0.87 0.82 1 1 1 2.5 1 2.5

2.4 0.5 0.67 0.82 1 1 6 3 6 3

2.5 10.124 0.8 0.8 1 1.2 Lumpsum 10.124 Lumpsum 8.4366667

126.624 80.536667

3.0 = 129.00 kVA

4.0 = 0.75

5.0

5.1 = 160 kVA

5.2 = 4.5 %

5.3 = 37 KW

5.4 = 0.415 kV

5.5 = 0.86

5.6 = 0.935

5.9 = 113.99 kVA

5.10 = 276.09 kVA

5.11 = 161.05 kVA

5.14 = 3555.6 kVA


P. F.

= Diversity Factor

= Motor Efficiency

TRANSFORMER SIZING FOR JATNI (PHED) PUMPING STATION


Working Load

(kVA)

Connected Load

System P. F.

5.46

3.50

Pump-1 41.41

Sr.

No.L. F. D. F.

Lighting 13.18

Working Load



Total Load

Crane

Exhaust Fan

107.50

Pump-2 43.94


kWEffi.








5.7 FLC of motor = 64.013 AkW x 1000




P.F x Efficiency










1.7321 x kV










547

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 30

B) ��


= 14.89437688









D) ��


= 222.60


339.59







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 2

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.420733343


�� ! �"#$��%�



548

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 55

B) ��


= 14.89437688









D) ��


= 64.00


102.07







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.373493628


�� ! �"#$��%��&' (��



549

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 65

B) ��


= 14.89437688









D) ��


= 34.78


55.47







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.886103934


�� ! �"#$��%��)*+ (��



550

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 14.89437688









D) ��


= 41.74


66.57








4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.892065612


�� ! �"#$��%��,' ��"�-�" ��



551

A) FEEDER DATA



2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 14.89437688









D) ��


= 17.39


27.74







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.580775149


�� ! �"#$��%��



552

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 35

B) ��


= 14.86428723









D) ��


= 222.60


339.59







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 2

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.490855567

CABLE SIZE CHOSEN = 2 X 3.5CX120 sq.mm Al XLPE Cable

�� ! �"#$��%�



553

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 60

B) ��


= 14.89437688









D) ��


= 29.72


47.40







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.48882313


�� ! �"#$��%��&� '��



554

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 70

B) ��


= 14.89437688









D) ��


= 33.39


53.25







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.949941298


�� ! �"#$��%��()* '��



555

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 85

B) ��


= 14.89437688









D) ��


= 18.09


28.85







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.282550675


�� ! �"#$��%��+)& '��



556

A) FEEDER DATA



2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 30

B) ��


= 14.89437688









D) ��


= 26.09


41.60







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.653372042


�� ! �"#$��%�� ,#� �,��



557

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 14.89437688









D) ��


= 43.13


68.79








4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 2.305561214


.

�� ! �"#$��%��&� ��"�-�" ��



558

1.0 Formula Used:



D. F.

Effi.

2.0

UnitTotal

(kW)Unit

Total

(kW)

2.1 18.5 0.913 0.83 0.95 1 2 37 1 17.575

2.2 9.3 0.892 0.81 0.95 1 2 18.6 2 17.67

2.3 30 0.925 0.84 0.95 1 2 60 1 28.5

2.4 0.5 0.67 0.82 1 1 8 4 8 4

2.4 7.5 0.87 0.82 1 2 1 7.5 1 3.75

2.5 11.314 0.8 0.8 1 1.5 Lumpsum 11.314 Lumpsum 7.5426667

138.414 79.037667

3.0 = 130.38 kVA

4.0 = 0.73

5.0

5.1 = 160 kVA

5.2 = 4.5 %

5.3 = 30 KW

5.4 = 0.415 kV

5.5 = 0.84

5.6 = 0.925

5.9 = 121.39 kVA

5.10 = 231.66 kVA

5.11 = 77.22 kVA

5.14 = 3555.6 kVA










3.5556





1.7321 x kV

(Rating in kVA of transformer assumed - Largest motor KVA)



5.12 Fault Level at transformer secondary side =



P.F x Efficiency


largest motor

5.7 FLC of motor = 53.713 AkW x 1000





Pump-3

Total Load

Exhaust Fan

Lighting and small power (indoor and outdoor) 11.79

108.65

36.68

7.28




Pump -1 23.19

Pump-2 24.46



System P. F.

TRANSFORMER SIZING FOR KHORDA (JAMADEI) PUMPING STATION


Crane 5.26

= Diversity Factor

= Motor Efficiency

Sr.

No.Item Description

Rating in

kW


Effi.Working Load

(kVA)


P. F. L. F. D. F.


559








pf1) - Tan (Cos-1

pf2))

560

1.0 Formula Used:



D. F.

Effi.

2.0

UnitTotal

(kW)Unit

Total

(kW)

2.1 22 0.917 0.83 0.95 1 2 44 1 20.9

2.2 11 0.892 0.81 1 1 2 22 2 22

Pump -1 27.46

= Diversity Factor

= Motor Efficiency


kWEffi.

Working Load

(kVA)


P. F. L. F. D. F.



TRANSFORMER SIZING FOR KHORDA ( Gurjanga) PUMPING STATION


Sr.

No.

Pump -2 30.452.2 11 0.892 0.81 1 1 2 22 2 22

2.3 7.5 0.87 0.82 0.9 2 1 7.5 1 3.375

2.4 0.5 0.67 0.82 1 1 8 4 8 4

2.5 10.646 0.8 0.8 1 1.3 Lumpsum 10.646 Lumpsum 8.1892308

88.146 58.464231

3.0 = 99.26 kVA

4.0 = 0.71

5.0

5.1 = 100 kVA

5.2 = 4.5 %

5.3 = 22 KW

5.4 = 0.415 kV

5.5 = 0.83

5.6 = 0.917

5.9 = 71.095 kVABase load on transformer before starting fourth




P.F x Efficiency



5.7 FLC of motor = 40.212 AkW x 1000

Total Load

Crane

Exhaust Fan

82.72






System P. F.


Lighting 12.80

7.28

4.73

Pump -2 30.45

5.10 = 173.43 kVA

5.11 = 57.81 kVA

5.14 = 2222.2 kVA










= 2.2222





1.7321 x kV

largest motor



5.12 Fault Level at transformer secondary side


561








pf1) - Tan (Cos-1

pf2))

562

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 60

B) ��


= 9.297701931









D) ��


= 139.12


212.24







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.735363623


�� !"��#



563

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 55

B) ��


= 9.297701931









D) ��


= 12.85


20.50







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.944690954


��$�� !"��#�� %��



564

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 9.297701931









D) ��


= 23.29


37.15







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.245274439


��$�� !"��#��&& %��



565

A) FEEDER DATA



2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 9.297701931









D) ��


= 20.87


33.28







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.115594136


��$�� !"��#��



566

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 9.297701931









D) ��


= 34.78


55.47








4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.859323559


.

��$�� !"��#��&' �� (� ��



567

1.0 Formula Used:



D. F.

Effi.

2.0

UnitTotal

(kW)Unit

Total

(kW)

2.1 90 0.95 0.85 0.9 1 2 180 1 81

2.2 45 0.936 0.86 0.9 1 2 90 2 81

2.3 7.5 0.87 0.82 0.9 2 1 7.5 1 3.375

2.3 0.5 0.67 0.82 1 1 8 4 8 4

2.4 15 0.8 0.8 1 1.5 Lumpsum 15 Lumpsum 10

296.5 179.375

3.0 = 274.29 kVA

4.0 = 0.78

5.0

5.1 = 315 kVA

5.2 = 4.5 %

5.3 = 90 KW

5.4 = 0.415 kV

5.5 = 0.85

5.6 = 0.95

5.9 = 203.54 kVA

5.10 = 668.73 kVA

5.11 = 222.91 kVA

5.14 = 7000 kVA










= 7





1.7321 x kV

Base load on transformer before starting largest

motor (Rating in kVA of transformer assumed - Largest motor KVA)



5.12 Fault Level at transformer secondary side




P.F x Efficiency



5.7 FLC of motor = 155.05 AkW x 1000

Total Load

Crane

Exhaust Fan

228.57




Pump -1 100.31

= Diversity Factor

= Motor Efficiency


kWEffi.

Working Load

(kVA)


P. F.



System P. F.


L. F. D. F.



TRANSFORMER SIZING FOR KHORDA ( PHED) PUMPING STATION


Lighting 15.63

7.28

4.73

Sr.

No.

Pump -2 100.63

568








pf1) - Tan (Cos-1

pf2))

569

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 30

B) ��


= 29.30130143









D) ��


= 438.24


668.56







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 2

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.468041806


�� !



570

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 55

B) ��


= 29.27722971









D) ��


= 89.97


143.49







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.447620248


��"�� !��#$ %��



571

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 65

B) ��


= 27.89310579









D) ��


= 44.98


71.74







4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 1.140931639


��"�� !��&' %��



572

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 27.89310579









D) ��


= 76.52


122.04








4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.636144578


.

��"�� !��'' ��(��



573

1.0 Formula Used:



D. F.

Effi.

2.0

UnitTotal

(kW)Unit

Total

(kW)

2.1 132 0.957 0.86 0.9 1 3 396 2 237.6

2.2 Dewatering pump 1.5 0.79 0.81 1 1.5 1 1.5 1 1

2.3 EOT crane 15 0.902 0.81 0.9 2 1 15 1 6.75

2.4 Chain pully 3.7 0.83 0.82 0.9 2 1 3.7 1 1.665

2.5 Exhaust fan 0.5 0.67 0.82 1 1 6 3 6 3

2.6 Lighting (Indoor & Outdoor) 10 0.9 0.8 1 1.5 Lumsum 10 Lumsum 6.6666667

Total Load 429.2 256.68167

3.0 = 376.29 kVA

4.0 = 0.8186

5.0

5.1 = 400 kVA

5.2 = 4.5 %

5.3 = 132 KW

5.4 = 0.415 kV

5.5 = 0.86

5.6 = 0.957

5.9 = 239.6150762 kVA

5.10 = 962.3095429 kVA

5.11 = 320.7698476 kVA

5.14 = 8888.888889 kVA












1.7321 x kV

5.12 Fault Level at transformer secondary side = 8.888888889 MVARating of transformer in MVA x 100







P.F x Efficiency


5.7 FLC of motor = 223.122046 AkW x 1000





System P. F.




313.57


1.56

9.24

5.46

6.17

2.45

Sr.

No.Item Description

Rating in

kWEffi. P. F. L. F.

TRANSFORMER SIZING FOR RWPS PLANT



= Diversity Factor

Vertcal Pump 288.69

= Motor Efficiency


D. F.


(kVA)

574


Intermediate Pumping Station


2 Total Working load in IPS 257 kW





pf1) - Tan (Cos-1

pf2))

575

Short circuit calculation RWPS

Assumptions


2 Base MVA 2000



Z= 9.27%

Qty 1 Nos



3



Z= 10.18%

Qty 1 Nos



4

Line length = 18 kM




5


Capacity = 0.40 MVA

Z= 4.5%

Qty 1 Nos







Fault clearing time for 0.415kV ACB Breaker (t) = 0.08 Sec

Fault clearing time for 0.415kV MCCB Breaker (t) = 0.04 Sec



12 Starting current for Y-D= 2 times


Formula used

1

2

3 Zline =

4 Zcable =




Transformer at CWPS

Zsource =Base MVA

Fault level at 220kV bus

Ztransformer =Base MVA

X tranformer Z%Transformer capacity in MVA

Base MVAX Line Z

kV2

Base MVAX Cable Z

kV2

576

Calculation


220KV Bus 0.1 20000 52

220KV/132KV,100MVA transformer 1.7

1 132kV Bus 1.8 1130.8 5


3 33kV Bus 6.3 315.0 5.51

b RWPS

1 18 kM 33kV O/H line from Chandaka Substation to RWPS 9.03

2 33kV Bus 15.38 130.0 2.27 24.2

3 33kV/0.415kV, 0.4MVA transformer 202.50

4 0.415kV side of 0.4MVA transformer 217.88 9.2 12.77 38.4

(XLPE,AL,0.415kV)

5

0.415kV , XLPE ,3 X 3.5core x 185sqmm cable from

transformer to RWPS PMCC 30.07

6 RWPS PMCC 247.95 8.1 11.22 33.8

(,AL,0.415 kV)

7

0.415kV , XLPE ,3.5core x 50sqmm cable from RWPS

PMCC to RWPS Auxilary MCC 286.87

8 RWPS Auxilary MCC 534.82 3.7 5.20 11.1

Sr No Description

Impedance

" Z"

Fault level

"MVA"

Fault Current

"kA"

Minimum Cable

size "SQMM"

577

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 35

B) ��


= 36.76955262






2 GROUPING/SPACING WITH OTHER CABLES = Cable laid in Ground (3 cables touching)



D) ��


= 556.50


848.97





2 R AT CONDUCTOR TEMP. (3.5C x 185SQmm AL XLPE Cable) = 0.21


4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 3

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.571949485


��



578

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 45

B) ��


= 31.08260872









D) ��


= 128.52


196.07






3 X AT CONDUCTOR TEMP. (3C x 70SQmm AL XLPE Cable) = 0.0724

4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.896555308


�� !"# ��



579

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 30

B) ��


= 31.08260872









D) ��


= 82.08


125.22





2 R AT CONDUCTOR TEMP. (3.5C x 50SQmm AL XLPE Cable) = 0.82


4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.720435477


�� $%&'��(� ��



580

A) FEEDER DATA

1 WORKING LOAD (KW)


2 VOLTAGE (V) = 0.415

3 PF = 0.8



6 CONSTANT K = 94

7 LENGTH = 40

B) ��


= 31.98529823









D) ��


= 104.34


166.42








4 COSø = 0.8

5 SINø = 0.6

6 No of runs: = 1

% VOLTAGE DROP =

7 % VOLTAGE DROP = 0.64701408


�� )*� ��+�,�+&��



581

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Design Calculation 04-02-2011 R2_ELECTRICAL