吉林省电网220kV变压器中性点保护间隙的选择  

Protective Gap Selection on Neutral-point of 220kV Transformers in Jilin Province

作　　者：董恩伏[1] 郑良华 

机构地区：[1]吉林省电力有限公司,吉林长春130021 [2]吉林省电力有限公司电力科学研究院,吉林长春130021

出　　处：《吉林电力》2007年第5期26-28,共3页Jilin Electric Power

摘　　要：分析、计算了220 kV系统中变压器中性点不接地时的过电压,根据国家电网公司和有关规程对变压器中性点保护的规定,提出了吉林省电网220 kV变压器中性点不接地采用单独290 mm间隙保护方式,使有效接地系统发生单相接地暂态过电压时保护不动作,保护变压器中性点在雷电冲击时绝缘不受损害。The overvoltage in 220 kV neutral unearthed transformer is analysed. According to the protective specifies of the related regulations to the transformer neutral point in the State Grid Co. , single 290 mm protective gap is adopted in 220 kV neutral unearthed transformers in Jilin Power Grid. The transient overvoltage protection does not act when single phase earthing occurred in effectively grounding system, So the insulation of the neutral point of the transformers does not be injured in lightning surge.

关 键 词：中性点保护间隙 变压器 220 KV电压等级 

分 类 号：TM772[电气工程—电力系统及自动化]