The use method and operation process of zero phase sequence current transformer

- Apr 20, 2019-

How to use zero phase sequence current transformer

The zero phase-sequence current transformer can be equipped with a current transformer on each of the three-phase circuits or a three-phase conductor through a zero-sequence current transformer, and a zero-sequence current can be installed on the neutral line N during operation. A transformer that is used to detect the sum of the current vectors of the three phases. Use these current transformers to detect the current vector sum of the three phases, ie zero-sequence current Io, IA+IB+IC=IO, when the three-phase load connected to the line is fully balanced (no ground fault, and no consideration of lines, electrical equipment) Leakage current), IO=0; when the three-phase load connected to the line is unbalanced, IO=IN, the zero-sequence current at this time is the unbalanced current IN; when a phase fault occurs in a phase, a The single-phase ground fault current Id, the zero-sequence current detected at this time, IO=IN+Id, is the vector sum of the three-phase unbalanced current and the single-phase ground current.

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