基于电感特征的并联电抗器匝间短路故障识别方法  

Inter-turn Short-circuit Fault Identification Method for Shunt Reactor Based onInductance Characteristics

作　　者：陈继瑞[1] 李宝伟[1,2] 倪传坤[1] 石欣[1] 王东兴 吕利娟[1] CHEN Jirui;LI Baowei;NI Chuankun;SHI Xin;WANG Dongxing;LYU Lijuan(XJ Group Co.,Ltd.,Xuchang 461000,China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology),Wuhan 430074,China)

机构地区：[1]许继集团有限公司,河南省许昌市461000 [2]强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《电力系统自动化》2022年第20期167-173,共7页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51877090);国家电网公司总部科技项目(特高压交流保护国产芯片替代关键技术及系统应用设计研究,5100-202255011A-1-1-ZN)。

摘　　要：电抗器绕组匝间短路或铁芯饱和时自身电感值会发生变化。实时计算出电抗器绕组电感值,将提高匝间短路故障识别的准确性。通过推导电抗器模型回路方程得到了匝间短路时电感值与电压、电流及短路电流之间的映射关系,提出了基于最小二乘法的电感值时域计算方法。针对匝间短路故障识别问题,研究分析了匝间短路故障及铁芯饱和时绕组电感及电感变化率值的不同收敛特征,提出了基于电感特征的并联电抗器匝间短路故障识别方法,并配合零序电流综合谐波及相电流特征共同识别电抗器饱和。所提方法不仅没有改变现有匝间短路保护基本原理,而且适用性强、可靠性高。The inductance value of the reactor winding changes due to inter-turn short-circuit or core saturation.The real-time calculation of reactor winding inductance improves the accuracy of inter-turn short-circuit fault identification.By deriving the circuit equation of the reactor model,the mapping relationship between the inductance value and voltage,current and short-circuit current is obtained,and the time-domain calculation method of inductance value based on the least square method is proposed.Aiming at the problem of inter-turn short-circuit fault identification,the different convergence characteristics of winding inductance and inductance change rate value when inter-turn short-circuit fault and core saturation occur are studied and analyzed.A method of inter-turn short-circuit fault identification of shunt reactors based on inductance characteristics is proposed,and the reactor saturation is identified together with zero-sequence current comprehensive harmonic and phase current characteristics.The proposed method does not change the basic principle of existing inter-turn short-circuit protection and has strong applicability and high reliability.

关 键 词：并联电抗器 铁芯饱和 电感变化率 匝间短路 综合谐波 

分 类 号：TM472[电气工程—电器]