Four Hazards of Wrong Polarity Connection of Current Transformer

1. If the current transformer is used in the relay protection circuit, it will cause the misoperation or refusal of the relay protection layer device.

2. If current transformers are used in the meter measuring loop, the correct measurement of power meters and electricity meters will be affected.

3.the use of incomplete star connection of the current transformer, such as the polarity of either phase is reversed, will cause the current of the current transformer (generally medium phase) is higher than the other phase.

4. If the current transformer adopts incomplete star connection, if the two phases are connected in reverse, although the three-phase current of the second measurement is still balanced, the phase Angle difference between it and the corresponding primary current is 180°, which will invert the watt-hour meter.