消弧线圈分散补偿单相接地故障运行特性分析

为应对配电网电容电流剧增给增容改造带来的困难,文章提出了消弧线圈分散补偿接地方式,并对消弧线圈分散补偿接地系统的运行特性进行分析和研究。首先阐述了分散补偿接地系统的原理及特点,分析了分散补偿消弧线圈的调节原理和安装位置;然后讨论了分散补偿消弧线圈的安装位置、不同补偿容量分配和不同过渡电阻对故障点接地残流的影响;最后对分散补偿接地系统的弧光过电压进行分析。通过Matlab/Simulink建模和仿真,结果表明消弧线圈分散补偿能有效补偿故障接地电流并满足残流要求,发生间歇性故障接地时消弧线圈分散补偿也能很好地抑制弧光过电压至较低水平。

Analysis of single - phase - to - ground fault operation characteristic of arc suppression coil dispersion compensation

In order to solve the problems caused by the increase of capacitor current in distribution network, the decentralized compensation grounding method of arc suppression coil is put forward, and the running characteristics of arc suppression coil distributed compensation grounding system are analyzed and studied. Firstly, the principle and characteristics of decentralized compensation grounding system are expounded, and the principle and installation method of decentralized compensated arc suppression coil are analyzed. Then, the influence of decentralized compensation arc suppression coil installation position and different capacity distribution on ground residual flow under different transition resistance is discussed.Fanally, the overvoltage of the distributed compensation grounding system is analyzed.Through Matlab / Simulink simulation,the result shows that the decentralized compensation of the arc suppression coil and the traditional centralized compensation can effectively compensate the fault ground current and meet the residual flow requirements,and the decentralized compensation of the arc suppression coil can also suppress the arc overvoltage well.#$NLKeywords: arc suppression coil; decentralized compensation; ground residual flow; arc overvoltage