Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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750 kV主变加装中性点小抗的研究及应用分析

来源:电工电气发布时间:2016-03-14 15:14 浏览次数:7

750 kV主变加装中性点小抗的研究及应用分析 

蔡晶1,沈星2,石海珍1,杨利民1,张楠1 
(1 国网新疆电力公司检修公司,新疆 乌鲁木齐 830000;
2 国网电力科学研究院武汉南瑞有限责任公司,湖北 武汉 430074)
 
 

摘 要: 为降低乌北750 kV 变电站220 kV 侧的单相及两相接地( 非对称) 短路电流,使其小于三相短路电流,采用变压器中性点加装小抗的方法来实现该目标。研究了变压器中性点小抗的选择,以及变压器中性点加装小抗之后,对继电保护、绝缘配合及倒闸操作的影响。结果表明,当主变压器中性点经小抗接地时,接地短路电流幅值变小,保护装置的灵敏度变差,变电站的绝缘配合不受影响。
关键词: 短路电流;中性点小抗;继电保护;绝缘配合;倒闸操作
中图分类号:TM403.5 文献标识码:A 文章编号:1007-3175(2015)05-0015-05


Research and Application Analysis of 750 kV Main Transformer Adding Neutral Small Reactance 

CAI Jing1, SHEN Xing2, SHI Hai-zhen1, YANG Li-min1, ZHANG Nan1 
(1 State Grid Xinjiang Maintenance Company, Urumqi 830000, China;
2 Wuhan NARI Co., Ltd, State Grid Electric Power Research Institute, Wuhan 430074, China)
 
 

Abstract: To reduce the short-circuit current(asymmetric) of 220 kV side in Wubei 750 kV substation, making it reach the goal of less than three-phase short circuit current, the method of transformer adding neutral small reactance was adopted to reach the goal.This paper studied the choice of transformer neutral small reactance, and the influence of relay protection, insulation coordination and brake operation. The result shows that the grounding short-circuit current amplitude decreases, the sensitivity of protection device tails away, and the insulation coordination of the substation is not affected when the neutral point of main transformer via small reactance grounding.
Key words: short circuit current; neutral small reactance; relay protection; insulation coordination; switching operation


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