变压器及并联电容器的铁磁谐振分析_李国庆.pdfVIP

第42 卷 第 9 期 电力系统保护与控制 Vol.42 No.9 2014 年 5 月 1 日 Power System Protection and Control May 1, 2014 变压器与并联电容器的铁磁谐振分析 1 1 2 1 李国庆 ，彭 石 ，张少杰 ，王振浩 （1.东北电力大学电气工程学院，吉林 吉林 132012；2.国网兴安盟供电公司，内蒙古 兴安盟 137400） 摘要：当变压器空载或轻载运行时，线路发生断线故障或断路器非同期合闸，可能造成并联电容器组与变压器铁芯线圈发生 铁磁谐振。以系统发生单相断线故障为例，推导出谐振时电网电压与并联电容器的谐振条件表达式。通过分析谐振时并联电 容器组与变压器铁芯线圈伏安特性，给出并联电容器与变压器产生铁磁谐振的机理和特点,并提出了有效抑制铁磁谐振发生 的具体措施。仿真结果验证了理论分析与抑制方法的正确性。 关键词：变压器铁芯线圈；并联电容器组；断线故障；铁磁谐振；过电压 Analysis of ferromagnetic resonance between transformer and shunt capacitor 1 1 2 1 LI Guo-qing , PENG Shi , ZHANG Shao-jie , WANG Zhen-hao (1. School of Electrical Engineering, Northeast Dianli University, Jilin 132012, China ； 2. State Grid Xing’an Electric Power Supply Company, Xing’an Meng 137400, China) Abstract: Under transformer no-load or light load operation, shunt capacitor banks and transformer core coil may cause the ferromagnetic resonance because of line breaks or circuit breaker asynchronous closing and then overvoltage is generated. Taking single-phase disconnection fault occurred in the power system for example, this paper derives resonance condition expression between the gird voltage and shunt capacitor capacitance. When ferromagnetic resonance is occurred, the mechanism and characteristics of ferromagnetic resonance generated by shunt capacitors and transformers are elaborated through analyzing the volt-ampere characteristic between shunt capacitor bank and transformer core coil, and specific measures that can effectively suppress