What is the difference between a current transformer and a zero sequence current transformer?

1. Current transformers and zero-sequence current transformers use different methods. Zero-sequence current transformers are used to detect zero-sequence current. Generally, all three fronts are passed through the inner hole of the transformer to measure the vector sum of the three-phase current. It is the zero sequence current.

　　2. The characteristics of the zero sequence current determine that the primary current of the zero sequence current transformer is very small under normal conditions, but under abnormal conditions, the zero sequence current will also be large.

　　3. Since the zero-sequence current transformer generally passes through three fronts, the inner hole of the zero-sequence transformer is larger under the same primary current. “Inner hole diameter” is an important goal of zero sequence transformer.

　　4. The Huaiqin level is lower. In daily life, we don’t often see current transformers, but it covers a lot of places, and it is indispensable. The current transformer is a special transformer, and its operating principle is similar to that of the transformer. The difference is that in the iron core of the transformer, the alternating main magnetic flux is generated by the current of the communication voltage applied to both ends of the primary winding. The alternating main magnetic flux in the iron core induces the corresponding secondary electromotive force and secondary current in the secondary winding of the current transformer. Since the primary winding and the secondary winding of the current transformer are made in the same iron core, they are interlinked by the same alternating main magnetic flux, so the current and the product of the number of turns of the primary winding and the secondary winding should be equal in value.