电压互感器4PT接线对谐波测量结果的影响  

Impact of 4PT Connection on Harmonic Measurement Results

作　　者：代双寅[1] 李琼林[1] 单瑞卿 刘书铭[1] 

机构地区：[1]河南电力试验研究院,郑州450052 [2]河南省洛阳市供电公司,洛阳471009

出　　处：《电力系统及其自动化学报》2014年第4期71-75,共5页Proceedings of the CSU-EPSA

摘　　要：为了研究电压互感器4PT接线方式对谐波测量结果的影响,该文结合实际谐波测量案例,通过对谐波测量结果进行深入分析,根据变压器的电磁关系从理论上溯源谐波测量结果异常机理,并基于PSCAD/EMTDC对电压互感器的接线方式进行仿真研究,最后对电压互感器采用4PT接线时谐波测量提出建议。研究结果表明电压互感器采用4PT接线时增大了零序电流的阻抗,使磁通中产生了3次谐波成分,从而造成谐波测量结果中3次谐波成分显著增大,该方式下二次侧的测量结果不能真实地反映实际的谐波情况。In order to study the impacts of potential transformer with 4PT connection mode on harmonic measurement results,harmonic measurement results are analyzed based on an actual case and the reason of abnormal results is studied in theory according to the electromagnetic correlations of transformer.Then 4PT connection is simulated on PSCAD/ EMTDC.Finally,harmonic measurement suggestions are proposed.Analysis shows that when 4PT connection is used,the increase of zero sequence impedance makes the magnetic flux produce third harmonic component and leads to secondary voltage waveform distortion with third harmonic component.The harmonic measurement results can not accurately reflect the real harmonic situation.

关 键 词：电压互感器 接线方式 谐波 测量 仿真 

分 类 号：TM451[电气工程—电器] TM935