Computer · Power System Protection
A power transformer has its high-voltage (H.V.) and low-voltage (L.V.) windings connected in Star (with earthed neutral) and Delta, respectively. A differential protection scheme is used for this transformer. What should be the connection type of the current transformers (CTs) on the H.V. and L.V. sides respectively to compensate for the phase shift?
- 1H.V. side: Star, L.V. side: Star
- 2H.V. side: Delta, L.V. side: Star✓
- 3H.V. side: Delta, L.V. side: Delta
- 4H.V. side: Star, L.V. side: Delta
Correct answer
H.V. side: Delta, L.V. side: Star
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