Civil Engineering Online Forum \ electrical engineering \ relay protection \ For differential protection of motors above 2000KW, how to deal with different CT ratios on both sides?

For differential protection of motors above 2000KW, how to deal with different CT ratios on both sides?

Generally speaking, for motors above 2000kW, differential protection needs to be set, and the CT transformation ratio on both sides of the motor should be consistent.
If the CT ratios on both sides are inconsistent, what should be done?

Published on 2010-09-30 12:22:30

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Answer All （25 ）

wzhq802

In order to reduce the impact of CT transformation ratio error, differential protection needs to set a reference transformation ratio, that is, convert the secondary current collected at each side into the actual primary current, and then convert it into the secondary current value through the reference transformation ratio. Therefore, you need to set a benchmark transformation ratio. If the transformation ratio on each side is not different, you can set it on either side. If the difference is large, you can set an intermediate transformation ratio.

2024-02-21 16:04:21 From PC comment report
electricity

Make it the same. This is not troublesome, but the trouble is that a CT is far away, so you should be careful in this choice.

2023-12-26 15:17:26 From PC comment report

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