中压电网不同接地方式下过电压保护方案的探讨

Overvoltage Protection Solutions for Medium Voltage Power Supply System under Different Grounding Modes

我国3~35 k V中压供电系统一般采用中性点不接地或中性点经消弧线圈接地的供电方式。近年来,部分企业开始采用中性点经小电阻接地。针对企业供电系统各种不同的接地方式提出三种整体保护方案,并对其原理及优缺点进行分析,探讨中压供电系统过电压保护方案的技术可行性与经济性,以期找到一种有效的防范措施,全面提高企业的供电质量。

In China,the3~35kV medium voltage power supply system generally adopts the power supply mode of neutral point ungrounding or neutral grounding through arc suppression coil.In recent years,some enterprises began to use neutral grounding through small resistance.In this paper,three types of overall protection schemes are proposed for different grounding modes of power supply system.The principle,advantages and disadvantages of the three schemes are analyzed and the technical feasibility and economy of overvoltage protection solution for medium voltage power supply system are discussed,to find an effective preventive measure and improve the quality of power supply.