Mathematics · Transformer Differential Protection
A star-delta connected three-phase transformer, 66 kV/11 kV, is protected by a biased differential relay. The CTs on the LV side have a ratio of 400 : 5. The ratio of the CTs on the HV side should be:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1200√3 : 5✓
- 22003 : 5
- 3200 : 5
- 4200√3 : 5
Correct answer
200√3 : 5
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