漏电保护电流互感器加装磁屏蔽环的探讨

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Analysis of Electromagnetic Shield for LV Motor Electric Leakage Protection

摘要: 通过对漏电保护用零序电流互感器加装磁屏蔽环前后的对比分析,揭示零序电流互感器加装磁屏蔽环防止漏电保护装置误动作的机理。分析表明:加装磁屏蔽环改变了零序电流互感器的特性,可能导致漏电保护装置在接地故障情况下拒动。
- 漏电保护 /
- 零序电流互感器 /
- 磁屏蔽环 /
- 等值电路
Abstract: By comparison and analysis of the original equivalence magnetic field and circuit of the zero sequence CT for electric leakage protection with which with a electromagnetic shield, this paper shows how the electromagnetic shield works, finds that the CT with electromagnetic shield is with different characteristics from the original one. It is concluded that the electric leakage protection will not pickup when certain fault occurs.
- Electric leakage protection /
- Zero sequence CT /
- Electromagnetic shield /
- Equivalence magnetic field and circuit