60120

180 240 300 360 420 480 540 600

11 Amp

4 Amp

7 Amp

112 Amp,5 min

45 Amp,10min

10

20

30

40

60

70

80

90

100

110

120

50

Time (min)

Cu

rre

nt (A

mp

)

112 Amp,5 min

130A

Protection Circuits &

Breakers

Interlocking Circuits

Emergency Lighting

Protection Circuits &

Relay Coils

DS Motor Circuit

LEGEND

Load Description

Section Load Details

Load (amp)

Time

Duration

(min)

A1 L1+L2+L3

127 5

A2 L1+L2

15 115

A3 L1+L2+L4

60 10

A4 L1+L2

15 170

A5 L1+L2+L5

22 60

A6 L1+L2

15 120

A7 L1+L2+L3

125 5

A8 L1+L2

15 115

L1

L2

L4

L3

L5

Continuous Momentary Continuous Momentary Continuous Momentary Continuous Momentary1 Line Protection Panel 4

1.1 Distance Protection Relay 1.00 20.00 50.00 20.00 50.00 0.18 0.45 0.73 1.82

1.2Backup (O/C, E/F) Protection Relay

1.00 15.00 25.00 15.00 25.00 0.14 0.23 0.55 0.91

1.3 Master Trip Relay 2.00 0.00 150.00 0.00 300.00 0.00 2.73 0.00 10.91

1.4 Dc Supervision Relay 2.00 4.50 0.00 9.00 0.00 0.08 0.00 0.33 0.00

1.5 Trip Coil Supervision Relay 6.00 4.50 15.00 27.00 90.00 0.25 0.82 0.98 3.27

1.6 Auxillary Relay 9.00 0.00 4.50 0.00 40.50 0.00 0.37 0.00 1.47

1.7 Indication Lamps 10.00 1.50 0.00 15.00 0.00 0.14 0.00 0.55 0.00

1.8 Semaphores 5.00 1.50 0.00 7.50 0.00 0.07 0.00 0.27 0.00

1.9 Energy Meter 1.00 0.50 0.00 0.50 0.00 0.00 0.00 0.02 0.00

1.10 Annunciator 1.00 20.00 35.00 20.00 35.00 0.18 0.32 0.73 1.271.11 Multifunctioning Meters 4.00 0.50 0.00 2.00 0.00 0.02 0.00 0.07 0.00

4.22 19.652 Bus Coupler Panel 1

2.1 O/C, E/F Protection Relay 1.00 15.00 25.00 15.00 25.00 0.14 0.23 0.14 0.232.2 Master Trip Relay 2.00 0.00 150.00 0.00 300.00 0.00 2.73 0.00 2.732.3 Dc Supervision Relay 2.00 4.50 0.00 9.00 0.00 0.08 0.00 0.08 0.002.4 Trip Coil Supervision Relay 6.00 4.50 15.00 27.00 90.00 0.25 0.82 0.25 0.822.5 Auxillary Relay 9.00 0.00 4.50 0.00 40.50 0.00 0.37 0.00 0.372.6 Indication Lamps 10.00 1.50 0.00 15.00 0.00 0.14 0.00 0.14 0.002.7 Semaphores 5.00 1.50 0.00 7.50 0.00 0.07 0.00 0.07 0.002.8 Energy Meter 1.00 0.50 0.00 0.50 0.00 0.00 0.00 0.00 0.002.9 Annunciator 1.00 20.00 35.00 20.00 35.00 0.18 0.32 0.18 0.322.10 Multifunctioning Meters 4.00 0.50 0.00 2.00 0.00 0.02 0.00 0.02 0.00

0.87 4.46

Nos per panel

Watt per Panel Current per PanelWattage per equipment Total Current

Total for Line Protection Control and Relay Panel

Total for Bus‐Coupler Panel

S.No. Description of Items Nos of panel

3 Transformer Protection Panel 13.1 Differential Protection Relay 1.00 20.00 50.00 20.00 50.00 0.18 0.45 0.18 0.45

3.2Backup (O/C, E/F) Protection Relay

1.00 15.00 25.00 15.00 25.00 0.14 0.23 0.14 0.233.3 Transformer HV REF 1.00 11.00 20.00 11.00 20.00 0.10 0.18 0.10 0.183.4 Master Trip Relay 2.00 0.00 150.00 0.00 300.00 0.00 2.73 0.00 2.733.5 Dc Supervision Relay 2.00 4.50 0.00 9.00 0.00 0.08 0.00 0.08 0.003.6 Trip Coil Supervision Relay 6.00 4.50 15.00 27.00 90.00 0.25 0.82 0.25 0.823.7 Auxillary Relay 9.00 0.00 4.50 0.00 40.50 0.00 0.37 0.00 0.373.8 Indication Lamps 10.00 1.50 0.00 15.00 0.00 0.14 0.00 0.14 0.003.9 Semaphores 5.00 1.50 0.00 7.50 0.00 0.07 0.00 0.07 0.003.10 Energy Meter 1.00 0.50 0.00 0.50 0.00 0.00 0.00 0.00 0.003.11 Annunciator 1.00 20.00 35.00 20.00 35.00 0.18 0.32 0.18 0.323.12 Multifunctioning Meters 4.00 0.50 0.00 2.00 0.00 0.02 0.00 0.02 0.00

1.15 5.10

Continuous Momentary Continuous Momentary1 Circuit Breaker 5

1.1 Spring Charge Motor 1 0 10 0 50

1.2 Trip Coil  6 0.03 3.2 0.9 161.3 Closing Coil 6 0.03 3.2 0.9 16

1.8 822 Disconnecting Switch 14

2.1 Motor  1 0 7 0 982.2 Interlocking Coils 1 0.03 3.2 0.42 44.8

0.42 142.83 Emergency Lighting 4 4

Description of Items

Total for Circuit Breaker

Total for Disconnecting Switch

Nos per Equipment

No of Equipmet

Current per equipment Total Current 

Total for Transformer Panel

Outdoor Equipment

S.No.