CT Calculation

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1 Rated Power 33000 KW 2 Rated Voltage 11 KV 3 Rated Power Factor 0.8 4 Rated Current 2165.1 Amps 5 Safety Margin 1.2 Times 6 CT Ration 2598.2 Hence CT Ratio Selected is 2600/1 Amps Vk Where Vk Knee Point Voltage Rct Secondary CT Resistance, decided by the CT Manuf Rl Lead Wire Resistance Secondary Fault Current Fault Level 40 KA 3 Secs Rct Ohms 2Rl 1.0 Ohms 15.38 Satey Margin 16.92 236.92 Volts CT Calculation for Vandana Project : 30(33) MW TG Set > 2 * If ( Rct + 2Rl ) If < 6 If Vk >

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Transcript of CT Calculation

Page 1: CT Calculation

1 Rated Power 33000 KW

2 Rated Voltage 11 KV

3 Rated Power Factor 0.8

4 Rated Current 2165.1 Amps

5 Safety Margin 1.2 Times

6 CT Ration 2598.2

Hence CT Ratio Selected is 2600/1 Amps

Vk

WhereVk Knee Point VoltageRct Secondary CT Resistance, decided by the CT ManufacturerRl Lead Wire Resistance

Secondary Fault CurrentFault Level 40 KA

3 SecsRct Ohms2Rl 1.0 Ohms

15.38Satey Margin 16.92

236.92 Volts

CT Calculation for Vandana Project : 30(33) MW TG Set

> 2 * If ( Rct + 2Rl )

If

< 6

If

Vk >