铁磁谐振仿真模型的探讨  

Approach to Simulation Model of Ferroresonance

作　　者：雷娟[1] 郭洁[1] 高媛[1] 余芳[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《电瓷避雷器》2007年第4期33-37,共5页Insulators and Surge Arresters

基　　金：国家自然科学基金(No.50577051).

摘　　要：利用电磁暂态计算程序(EMTP)仿真计算中性点不接地配电网中电磁式电压互感器(简称PT)励磁饱和引起的铁磁谐振过电压,必须建立准确的PT等值模型。实测10 kVPT的空载伏安曲线,得出其励磁曲线,采用不计磁滞和计及磁滞两种PT仿真模型进行计算,并对计算误差进行对比分析,结果表明:系统发生高频和基频谐振时,磁滞损耗对PT各相过电压都有明显的阻尼作用。采用计及磁滞的PT模型计算,高频谐振时,每相最大过电压比不计磁滞时分别降低约41%、31%和42%;基频谐振时,有一相电压降低约27%;系统发生分频谐振时,磁滞的影响较小。可见采用计及磁滞的PT等值模型的计算结果更符合实际。In order to calculate the ferroresonance overvoltage in neutral ungrounded distribution system which is resulted from the saturation of the electromagnetic voltage transformer （PT）, it is necessary to establish the exact equivalent model of the PT. It shows the excitation curve of a 10 kV PT through the test date of the no-load by the no-load test on the PT. Simulation is done on two different PT models, one model which doesn＇t consider the effect of hysteresis and the other one simulates＇the effect. Through analyzing of the error of calculation results of simulation, the conclusion is that hysteresis loss have an distinct damping effect on each phase overvoltage of PT when high and fundamental frequency resonance appear in system, when high frequency resonance appears, through using the model considering hysteresis, the maximal overvoltage of each phase reduces about by 41%, 31% and 42% respectively as compared with ignoring hysteresis, when fundamental frequency resonance appears , voltage of the lower voltage phase reduces about 27%. When fractional frequency resonance appears in system, hysteresis have an little effect. It is obvious that the calculation result which uses the model considering hysteresis to simulate is more accuracy.

关 键 词：电磁式电压互感器 铁磁谐振 电磁暂态计算程序 

分 类 号：TM862[电气工程—高电压与绝缘技术]