What are the characteristics of Zero Sequence Current Transformer in use?

The Zero Sequence Current Transformer cannot operate under the condition of exceeding the rated capacity. The overload will cause the passing current to exceed the rated current of the product, resulting in an increase in error and a decrease in the accuracy of the meter indication. Sometimes, it may even cause the core and winding temperature to be too high, causing insulation aging, and even damage to the product.

During the operation of Zero Sequence Current Transformer, it should ensure that its secondary circuit is closed. If the secondary winding is not needed, it should be short-circuited, and the secondary circuit can only have one grounding point.

In actual use, the side of the secondary coil and the iron core should be grounded at the same time. The grounding of the CT secondary side should be grounded. In order to avoid the breakdown between the primary winding and the secondary winding due to insulation faults, the secondary winding needs to be connected in series with a high voltage. When the secondary circuit is switched, the protective device should be stopped, and the circuit should not be opened during operation.

In the circuit system, the protection and the instrument have used the same group of products. When the meter circuit is working, it should be noted that the terminals of the meter itself are short-circuited, and neither open circuit nor short-circuit protection circuit is allowed. High frequency protection and zero sequence protection should be stopped before short circuit.