110kV变压器中性点不对称短路过电压研究  

Study of Neutral Point Asymmetric Short-circuit Overvoltage for 110 kV Transformer

作　　者：李鸿泽[1] 温生[2] 安韵竹[3] 

机构地区：[1]江苏省电力公司,江苏南京210024 [2]南京供电公司,江苏南京210008 [3]武汉大学电气工程学院,湖北武汉430072

出　　处：《水电能源科学》2011年第7期166-169,共4页Water Resources and Power

摘　　要：针对不对称故障在变压器中性点产生的过电压问题,运用对称分量法对不同情况下变压器中性点可能出现的最大过电压进行了理论计算,在ATP-EMTP中建立了宁夏洪广变电站的仿真计算模型,分别在单相接地短路、断线故障和系统非全相运行三种情况下仿真计算了变压器中性点的过电压,并分析了变压器中性点过电压在不同参数下的变化特点。计算结果表明,单相故障对变压器中性点绝缘可能造成的危害最大。In order to study the threat level of transformer neutral point under different faults, this paper analyzes overvolrage problems generated in the transformer neutral point under asymmetric faults. The symmetric component method is applied to calculate maximum overvoltage which may appear at the neutral point. Then the simulation model of Ningxia Hongguang substation is established with ATP-EMTP. The overvoltage of transformer neutral points is simulated under the conditions of single phase grounding short-circuit, disconnection faults, and open phase operation faults. Finally. the variation features of transformer neutral points overvoltage is also analyzed under the different parameters. The simulation result indicates that single phase faults may be the largest threat to transformer neutral points insulation.

关 键 词：110 KV变压器 中性点 不对称短路 过电压 ATP—EMTP 

分 类 号：TM41[电气工程—电器] TM77