主变低压侧接地保护功能完善及现场应用分析

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[摘要]针对发电机变压器单元接线方式且发电机与变压器之间的带出口断路器,探讨主变低压侧出现永久故障点、主变低压侧接地保护无跳闸功能时发生无法快速切除故障的问题,提出解决思路并进行现场实际应用分析。

[关键词]主变低压侧接地保护;GCB辅助接点;PT断线;辅助判据

[中图分类号]TM862[文献标志码]A[文章编号]1001-523X(2022)08-0058-03

Improvement of Grounding Protection Function at Low Voltage Side of Main Transformer and Field Application Analysis

Chen Qiang,Cao Gang

[Abstract]Aiming at the wiring mode of generator transformer unit and the outlet circuit breaker between generator and transformer,this paper discusses the problem that the permanent fault point occurs on the low-voltage side of main transformer and the fault cannot be removed quickly when the grounding protection on the low-voltage side of main transformer has no tripping function,and puts forward the solution and field practical application analysis.

[Keywords]low voltage side grounding protection of main transformer;GCB auxiliary contact;PT disconnection;Auxiliary criterion

电力系统中,中性点接地方式可分为中性点经消弧线圈接地、中性点不接地和中性点直接接地3种。(剩余4027字)

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