基于时域有限积分法的一二次融合配电开关雷击磁场分析  

Magnetic Field Analysis of Lightning Strikes for Primary and Secondary Fusion Distribution Switch Based on FITD

作　　者：张志华 路文超[2] 李再男 段建东 ZHANG Zhihua;LU Wenchao;LI Zainan;DUAN Jiandong(Electric Power Research Institute of State Grid Shaanxi Electric Power Company,Xi'an 710110,China;School of Electrical Engineering,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]国网陕西省电力公司电力科学研究院,西安710110 [2]西安理工大学电气工程学院,西安710048

出　　处：《高压电器》2021年第9期72-79,共8页High Voltage Apparatus

基　　金：国家自然科学基金项目(51877174);国网陕西省电力公司科技项目(5226KY16000M)。

摘　　要：一二次融合配电开关屡次出现因各种电磁干扰导致的二次回路信号误差,甚至开关误动或拒动的现象,而目前仅考虑了设备正常运行状态下电磁干扰。文中首先阐述一二次融合配电开关的电磁干扰机理,选择时域有限积分法进行开关电磁场分析;搭建大电流暂态发生装置模拟配电网雷电冲击下的电磁干扰,获取稳定的干扰信号;这些干扰信号用于电磁仿真软件CST MWS建模,分析某型号10 kV户外配电开关在电磁干扰下柱上开关和二次回路周围的磁场分布。仿真结果表明,在所提出的冲击干扰下,配电开关互感器侧瞬时磁场强度可达1300 A/m,FTU附近的瞬时磁场强度可达108.5 A/m,远超相关行业标准的规定值,在实际中极有可能造成二次设备出现故障。The primary and secondary fusion distribution switch has repeatedly appeared secondary circuit signal error due to various types of electromagnetic interference and even the situation of mal-operation or refusal operation.At present,the electromagnetic interference under the normal operating condition is only considered.The electromagnetic interference mechanism of primary and secondary fusion distribution switch is firstly described in this paper.The finite integration time domain(FITD)is used for the analysis of electromagnetic field of the switch.A large current transient generating device is set up to simulate the electromagnetic interference of the distribution network at lightning impulse and obtain stable interference signal.These interference signals are used for the modeling of electromagnetic simulation software CST MWS,and the magnetic field distribution around the pole switch and the secondary circuit of certain type of 10 kV outdoor distribution switch under electromagnetic interference is analyzed.The simulation results show that under the proposed impulse interference,the transient magnetic field strength at the instrument transformer side of distribution switch can reach 1300 A/m and that near the FTU can reach 108.5 A/m,which is far beyond the specified value of the relevant industry standards and,in practice,likely causes the fault of the secondary equipment.

关 键 词：一二次融合配电开关 电磁干扰 直击雷 时域有限积分法 

分 类 号：TM564[电气工程—电器]