摘要
中性点非有效接地系统中,由铁磁谐振过电压导致的电磁式电压互感器故障频发,对电力系统运行安全造成极大威胁。10~35 kV配网系统铁磁谐振的产生及发展特性已得到广泛研究,但对66 kV系统铁磁谐振过电压的产生、发展及抑制方法的研究相对较少,且缺少现场实际故障录波数据支持。因此笔者基于北京地区某500 kV变电站66 kV侧电压互感器谐振过电压故障的录波数据,结合变电站实际设备参数与故障工况,采用ATP-EMTP电磁暂态仿真软件建立该变电站铁磁谐振仿真模型,对66 kV母线合断路器充电时激发产生的铁磁谐振过电压及发展过程进行分析,将仿真结果与实际录波进行比对验证仿真模型有效性,并提出减小电压互感器额定电压下的磁密、优化励磁特性及三角绕组串入小电阻短接的4PT接线等谐振过电压抑制方法。
The generation and suppression of ferromagnetic resonance in 10~35 kV distribution systems have been widely studied,but there is relatively little research on the generation,development and suppression methods of ferromagnetic resonance overvoltage in 66 kV systems,and there is a lack of actual fault recording data in the field to support it.Therefore,we obtained the recorded wave data of resonant overvoltage fault of 66 kV side voltage transformer in a 500 kV substation in Beijing area,combined with the actual equipment data of the substation,established the simulation model of the substation based on ATP-EMTP electromagnetic transient simulation software,analyzed the causes and development of resonant overvoltage during charging of 66 kV busbar closing breaker,and compared the simulation results with the actual recorded wave to verify the validity of the simulation model.The simulation results are compared with the actual recordings to verify the validity of the simulation model,and the resonant overvoltage suppression method of 4PT wiring is proposed by reducing the magnetic density of the voltage transformer at rated voltage,optimizing the excitation characteristics and shorting the delta winding in series with a small resistance.
作者
向常圆
宋宝同
李笑彤
崔涵
陈小月
王思涵
王晓冰
XIANG Changyuan;SONG Baotong;LI Xiaotong;CUI Han;CHEN Xiaoyue;WANG Sihan;WANG Xiaobing(State Grid Beijing Economic Research Institute Co.,Ltd.,Beijing,10003,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)
出处
《电瓷避雷器》
CAS
2024年第3期77-84,共8页
Insulators and Surge Arresters
关键词
电磁式电压互感器
故障分析
抑制措施
EMTP
electromagnetic voltage transformers
fault analysis
suppression measures
EMTP
