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Zero Sequence Current Transformer

Zero sequence current transformer is a special type of current transformer mainly used to detect zero sequence current in power systems and cooperate with relay protection devices to achieve protection or monitoring functions. Zero sequence current transformer, also known as residual current transformer, grounding current transformer or leakage current transformer, is mainly used to detect neutral unbalanced current. working principle The working principle of zero sequence current transformer is based on electromagnetic induction. On a three-phase line, a current transformer (CT) can be installed separately, or the three-phase wires can be passed through a zero sequence CT together, or a zero sequence CT can be installed on the neutral line N. These CTs are used to detect the vector sum of three-phase currents, namely the zero sequence current Io. When the three-phase load is completely balanced, Io is zero; When the three-phase load is unbalanced or a grounding fault occurs, Io is not zero. Difference from ordinary current transformers The main difference between zero sequence current transformers and ordinary current transformers lies in their working state and wiring method. The primary coil of a regular current transformer only passes through one phase conductor of the measured line, while the primary coil of a zero sequence current transformer passes through a three-phase conductor. Under normal circumstances, ordinary current transformers generate induced magnetic flux, while zero sequence current transformers do not generate magnetic flux. In addition, zero sequence current transformers can detect large ground fault currents during single-phase ground faults, while ordinary current transformers cannot effectively detect zero sequence currents.
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