4 Total kVAR to be connected across Bus 55 KVAR

Working load ( Tan ( Cos

^-1

pf1) - Tan (Cos

^-1

pf2))

1.0 Formula Used:

2.5 10.124 0.8 0.8 1 1.2 Lumpsum 10.124 Lumpsum 8.4366667

126.624 80.536667

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

P. F.

= Diversity Factor

= Motor Efficiency TRANSFORMER SIZING FOR JATNI (PHED) PUMPING STATION

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

Working Load (kVA) Connected Load

System P. F. Input Data and Calculations:

Total Load Crane Exhaust Fan

107.50

Pump-2 43.94

Item Description Rating in kW Effi.

Supply voltage System voltage

Calculation to check the starting of largest size motor

Rating of transformer assumed Nearest staanddard size (Confg. 11/0.433KV,Dyn11,Delta-star)

% impedance of transformer assumed From IS 2026

Rating of the largest size motor From the above table

P.F of largest size motor From the above table

Efficiency of largest size motor From the above table

5.7 FLC of motor = 64.013 A kW x 1000

1.7321 x V x p.f x efficiency

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 = 46.014 kVA kW

P.F x Efficiency Base load on transformer before starting fourth

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

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

5.13 Fault current of transformer secondary side (ISC) = 4.9464 5.12 Fault Level at transformer secondary side = 3.5556

S.C capacity of transformer

MVA Rating of transformer in MVA x 100 Impedance of transformer in %

kA Fault Level in MVA

1.7321 x kV

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

5.15 Voltage drop at transformer terminal when largest

motor start with DOL starting = 10.971 % [Motor Starting kVA (DOL) + Base Load kVA] x 100

(within 10%)

The selected rating of transformer is 160 kVA

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

(within 10%) S.C capacity of transformer

5.16 Voltage drop at transformer terminal when largest

motor start with Star-Delta starting = 7.7

A) FEEDER DATA 1 WORKING LOAD (KW)

2 WORKING LOAD (KVA) = 160

(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 in ground (3 cables touching)

RATING FACTOR = 0.69

3 OVERALL DERATING FACTOR = 0.6555

D)

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

= 222.60

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING = FULL LOAD CURRENT/DERATING FACTOR 339.59

3 Current carring capacity of 3.5C x120 Sqmm AL XLPE cable is = 223

4 No of cable required = 1.52

E) CHECK FOR VOLTAGE DROP

1 CABLE SIZE = 3.5C x120 Sqmm AL XLPE cable

2 R AT CONDUCTOR TEMP. (3.5C x 120 SQmm AL XLPE Cable) = 0.324

(FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

A) FEEDER DATA 1WORKING LOAD (KW)

2 WORKING LOAD (KVA) = 46

(AS PER SHORT CIRCUIT CALCULATION) C) LAYING CONDITIONS

1AMBIENT AIR TEMPERATURE = 45

RATING FACTOR = 0.95

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

RATING FACTOR = 0.66

3OVERALL DERATING FACTOR = 0.627

D)

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

= 64.00

2CURRENT RATING REQ.AFTER CONSIDERING DERATING = FULL LOAD CURRENT/DERATING FACTOR 102.07

3Current carring capacity of 3C x35 Sqmm AL XLPE cable is = 117

4No of cable required = 0.87

E) CHECK FOR VOLTAGE DROP

1 CABLE SIZE = 3C x35 Sqmm AL XLPE cable

2 R AT CONDUCTOR TEMP. (3C x 35 SQmm AL XLPE Cable) = 1.11

(FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

A) FEEDER DATA 1WORKING LOAD (KW)

2 WORKING LOAD (KVA) = 25

(AS PER SHORT CIRCUIT CALCULATION) C) LAYING CONDITIONS

1AMBIENT AIR TEMPERATURE = 45

RATING FACTOR = 0.95

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

RATING FACTOR = 0.66

3OVERALL DERATING FACTOR = 0.627

D)

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

= 34.78

2CURRENT RATING REQ.AFTER CONSIDERING DERATING = FULL LOAD CURRENT/DERATING FACTOR 55.47

3Current carring capacity of 3C x16 Sqmm AL XLPE cable is = 70

4No of cable required = 0.79

E) CHECK FOR VOLTAGE DROP

1 CABLE SIZE = 3C x16 Sqmm AL XLPE cable

2 R AT CONDUCTOR TEMP. (3C x 16 SQmm AL XLPE Cable) = 2.44

(FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

A) FEEDER DATA 1 WORKING LOAD (KW)

2 WORKING LOAD (KVA) = 30

(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 in trench (9 cables touching)

RATING FACTOR = 0.66

3 OVERALL DERATING FACTOR = 0.627

D)

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

= 41.74

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING = FULL LOAD CURRENT/DERATING FACTOR 66.57

Considering 35% extra current 89.87

3 Current carring capacity of 3.5C x25 Sqmm AL XLPE cable is = 96

4 No of cable required = 0.94

E) CHECK FOR VOLTAGE DROP

1 CABLE SIZE = 3.5C x25 Sqmm AL XLPE cable

2 R AT CONDUCTOR TEMP. (3.5C x 25 SQmm AL XLPE Cable) = 1.54

(FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

A) FEEDER DATA

1 WORKING LOAD (KW) 10

2 WORKING LOAD (KVA) = 12.5

(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 in trench (9 cables touching)

RATING FACTOR = 0.66

3 OVERALL DERATING FACTOR = 0.627

D)

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

= 17.39

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING = FULL LOAD CURRENT/DERATING FACTOR 27.74

3 Current carring capacity of 4C x16 Sqmm AL XLPE cable is = 67

4 No of cable required = 0.41

E) CHECK FOR VOLTAGE DROP

1 CABLE SIZE = 4C x16 Sqmm AL XLPE cable

2 R AT CONDUCTOR TEMP. (4C x 16 SQmm AL XLPE Cable) = 2.44

(FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

A) FEEDER DATA 1 WORKING LOAD (KW)

2 WORKING LOAD (KVA) = 160

(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 in ground (3 cables touching)

RATING FACTOR = 0.69

3 OVERALL DERATING FACTOR = 0.6555

D)

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

= 222.60

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING = FULL LOAD CURRENT/DERATING FACTOR 339.59

3 Current carring capacity of 3.5C x120 Sqmm AL XLPE cable is = 223

4 No of cable required = 1.52

E) CHECK FOR VOLTAGE DROP

1 CABLE SIZE = 3.5C x120 Sqmm AL XLPE cable

2 R AT CONDUCTOR TEMP. (3.5C x 120 SQmm AL XLPE Cable) = 0.324

(FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

A) FEEDER DATA 1 WORKING LOAD (KW)

2 WORKING LOAD (KVA) = 37

(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 in trench (9 cables touching)

RATING FACTOR = 0.66

3 OVERALL DERATING FACTOR = 0.627

D)

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

= 29.72

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING = FULL LOAD CURRENT/DERATING FACTOR 47.40

3 Current carring capacity of 3C x16 Sqmm AL XLPE cable is = 70

4 No of cable required = 0.68

E) CHECK FOR VOLTAGE DROP

1 CABLE SIZE = 3C x16 Sqmm AL XLPE cable

2 R AT CONDUCTOR TEMP. (3C x 16 SQmm AL XLPE Cable) = 2.44

(FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

A) FEEDER DATA 1WORKING LOAD (KW)

2 WORKING LOAD (KVA) = 24

(AS PER SHORT CIRCUIT CALCULATION) C) LAYING CONDITIONS

1AMBIENT AIR TEMPERATURE = 45

RATING FACTOR = 0.95

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

RATING FACTOR = 0.66

3OVERALL DERATING FACTOR = 0.627

D)

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

= 33.39

2CURRENT RATING REQ.AFTER CONSIDERING DERATING = FULL LOAD CURRENT/DERATING FACTOR 53.25

3Current carring capacity of 3C x16 Sqmm AL XLPE cable is = 70

4No of cable required = 0.76

E) CHECK FOR VOLTAGE DROP

1 CABLE SIZE = 3C x16 Sqmm AL XLPE cable

2 R AT CONDUCTOR TEMP. (3C x 16 SQmm AL XLPE Cable) = 2.44

(FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

A) FEEDER DATA 1WORKING LOAD (KW)

2 WORKING LOAD (KVA) = 13

(AS PER SHORT CIRCUIT CALCULATION) C) LAYING CONDITIONS

1AMBIENT AIR TEMPERATURE = 45

RATING FACTOR = 0.95

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

RATING FACTOR = 0.66

3OVERALL DERATING FACTOR = 0.627

D)

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

= 18.09

2CURRENT RATING REQ.AFTER CONSIDERING DERATING = FULL LOAD CURRENT/DERATING FACTOR 28.85

3Current carring capacity of 3C x16 Sqmm AL XLPE cable is = 70

4No of cable required = 0.41

E) CHECK FOR VOLTAGE DROP

1 CABLE SIZE = 3C x16 Sqmm AL XLPE cable

2 R AT CONDUCTOR TEMP. (3C x 16 SQmm AL XLPE Cable) = 2.44

(FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

A) FEEDER DATA

1 WORKING LOAD (KW) 15

2 WORKING LOAD (KVA) = 18.75

(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 in trench (9 cables touching)

RATING FACTOR = 0.66

3 OVERALL DERATING FACTOR = 0.627

D)

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

= 26.09

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING = FULL LOAD CURRENT/DERATING FACTOR 41.60

3 Current carring capacity of 4C x16 Sqmm AL XLPE cable is = 70

4 No of cable required = 0.59

E) CHECK FOR VOLTAGE DROP

1 CABLE SIZE = 4C x16 Sqmm AL XLPE cable

2 R AT CONDUCTOR TEMP. (4C x 16 SQmm AL XLPE Cable) = 2.44

(FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

A) FEEDER DATA 1WORKING LOAD (KW)

2WORKING LOAD (KVA) = 31

(AS PER SHORT CIRCUIT CALCULATION) C) LAYING CONDITIONS

1AMBIENT AIR TEMPERATURE = 45

RATING FACTOR = 0.95

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

RATING FACTOR = 0.66

3OVERALL DERATING FACTOR = 0.627

D)

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

= 43.13

2CURRENT RATING REQ.AFTER CONSIDERING DERATING = FULL LOAD CURRENT/DERATING FACTOR 68.79

Considering 35% extra current 92.86

3Current carring capacity of 3.5C x25 Sqmm AL XLPE cable is = 96

4No of cable required = 0.97

E) CHECK FOR VOLTAGE DROP

1 CABLE SIZE = 3.5C x25 Sqmm AL XLPE cable

2 R AT CONDUCTOR TEMP. (3.5C x 25 SQmm AL XLPE Cable) = 3.94

(FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

1.0 Formula Used:

2.5 11.314 0.8 0.8 1 1.5 Lumpsum 11.314 Lumpsum 7.5426667

138.414 79.037667

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

(within 10%) S.C capacity of transformer

5.16 Voltage drop at transformer terminal when largest

motor start with Star-Delta starting = 5.6

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

5.15 Voltage drop at transformer terminal when largest

motor start with DOL starting = 9.9295 % [Motor Starting kVA (DOL) + Base Load kVA] x 100

(within 10%) 3.5556

S.C capacity of transformer

MVA Rating of transformer in MVA x 100

Impedance of transformer in %

kA Fault Level in MVA

1.7321 x kV

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

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

5.13 Fault current of transformer secondary side (ISC) = 4.9464 5.12 Fault Level at transformer secondary side =

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 = 38.61 kVA kW

P.F x Efficiency Base load on transformer before starting fourth

largest motor

5.7 FLC of motor = 53.713 A kW 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

Pump-3

Total Load Exhaust Fan

Lighting and small power (indoor and outdoor) 11.79

108.65 36.68

7.28

Calculation to check the starting of largest size motor

Rating of transformer assumed Nearest staanddard size (Confg. 11/0.433KV,Dyn11,Delta-star)

% impedance of transformer assumed From IS 2026

Pump -1 23.19

Pump-2 24.46

Rating of the largest size motor From the above table

Considering 20% contingency System P. F.

TRANSFORMER SIZING FOR KHORDA (JAMADEI) PUMPING STATION

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

Crane 5.26

= Diversity Factor

= Motor Efficiency

Sr.

No. Item Description Rating in

kW

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

Effi. Working Load

(kVA) Input Data and Calculations:

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

Connected Load Working Load

CAPACITOR BANK SIZING ACROSS BUS

1 Average Power factor (pf1) 0.727

2 Total Working load 79 kW

3 Power factor To be improved (pf2) 0.98

Total kVAR to be connected across Bus

In document vd calculation (Page 40-54)