Difference between zero-sequence current transformer and current transformer

Difference between zero-sequence current transformer and current transformer
The basic principle is the same as the ordinary transformer. The main differences are:
1. The method of use is different. The zero-sequence current transformer is used to detect the zero-sequence current. Generally, all three hot wires are passed through the inner hole of the transformer.
2. The characteristics of the zero-sequence current determine that under normal circumstances, the primary current of the zero-sequence transformer is very small, but under abnormal conditions, the zero-sequence current will also be large. This requires a wide measuring range of the zero-sequence current transformer. Therefore, the zero-sequence transformer usually allows a larger multiple of overload, and the overload capacity is reflected by the "accurate limit factor".
3. Because the zero-sequence transformer usually passes through three live wires, the inner hole of the zero-sequence transformer is larger under the same primary current. "Inner hole diameter" is an important index of zero-sequence transformers. When ordering, generally indicate.
4, the accuracy level is low.

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