Difference between Power Current Transformer and Zero Sequence Current Transformer
May 18, 2022| 1. The methods used are different. 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, and the vector sum of the three-phase currents is measured, that is, the zero-sequence current.
2. The characteristics of zero-sequence current determine that under normal circumstances, the primary current of the Zero Sequence Current Transformer is very small, but under abnormal circumstances, the zero-sequence current will also be large.
3. Since the Zero Sequence Current Transformer usually passes through three live wires, under the same primary current, the inner hole of the Zero Sequence Current Transformer is larger. "Inner hole diameter" is an important indicator of zero-sequence transformer.
4. The accuracy level is lower.