一种适用于配电开关辐射场仿真分析方法

Simulation Method for Calculating Radiation Field of Distribution Circuit Breakers

在一、二次融合配电开关设备中,操作过程中暂态电磁辐射会对安装在开关内部的二次元件产生影响。目前对配电开关设备的电磁兼容问题研究集中在试验检测,而缺乏对电磁辐射场的仿真工作。文中研究目标是建立一种适合于配电开关电磁辐射场仿真方法,并通过实验验证仿真方法的适用性。通过分析配电开关设备近场辐射的特点,认为时域有限积分法是计算该电磁模型的适用方法,接下来使用CST微波工作室时域有限积分软件对一台10 kV的真空断路器进行了建模,仿真分析了合闸涌流操作引起的电磁辐射场,并进行了相同条件的辐射磁场测量实验。仿真得到的辐射磁场波形与实验采集结果对比显示,二者波形变化趋势一致,数值误差小于15%,证明了该仿真方法对计算配电开关设备的电磁辐射场的适用性。

In primary-secondary integrated distribution circuit breakers, the transient radiation caused by switching operations may affect the inner secondary devices. However, the existing researches on EMC problems of distribution switching equipment are mostly focused one xperimental tests, which are lack of simulation parts. The objective of this paper is to establish one simulation method which is suitable for researching electromagnetic radiation problems of distributioncircuit breakers, and to verify the method by experiments. By analyzing features of near-field radiation of distribution circuit breakers, finite integration time domain （FITD） is considered as a suitable calculating methodology for this electromagnetism model. Next, one simulation model of a 10 kV vacuum circuit breaker is established by the simulation software CST microwave studio, and then an electromagnetic radiation field caused by the inrush current is calculated with FITD. The experimentalm easurement in the same condition is also carried out. The comparison between the simulation and experiment results shows that waveforms of them are similar in tendency and the error range is within 15%, which proves the availability of this simulation method in electromagnetic radiation calculation of distribution circuit breakers.