Difference between current transformer and zero sequence current transformer

- Mar 09, 2020-

1. Different methods are used. The zero sequence current transformer is used to detect the zero sequence current. Generally, all three live wires are passed through the inner hole of the transformer to measure the vector sum of the three-phase current, that is, the zero sequence current.
2. The characteristics of zero sequence current determine that the primary current of zero sequence current transformer is very small under normal conditions, but under abnormal conditions, the zero sequence current will also be very large.
3. Because the zero sequence current transformer usually passes through three live wires, the inner hole of the zero sequence current transformer is large under the same primary current. "Inner hole diameter" is an important index of zero sequence transformer.
4. The accuracy level is low.https://www.ctsensorducer.com/