一种基于ZnO阵列的并联电容器投切过电压保护装置的研究

Research on Switching Over-Voltage Protection Device of Parallel Capacitor Based on ZnO Array

矿用供电系统具有线路长、非线性负荷严重的特点,并需要频繁切换无功补偿设备以维持井下系统电压稳定性。为了限制真空断路器投切电容器组产生的过电压,针对目前存在的过电压保护器中的氧化锌阀片能量不足、均能性差的问题,提出了一种基于非线性高能氧化锌阀片的并联电容串抗过电压保护器的设计方法,首先分析了电容器投切过电压机理及抑制的关键所在,其次,提出了氧化锌阀片的高能筛选、均能组合方法和流程,最后,通过仿真模型和实际线路对过电压保护器的性能进行了验证。论文研究成果可为过电压保护器的设计提供新思路,并具有一定的工程适用性。

In order to limit the over-voltage produced by switching capacitor bank of vacuum circuit breaker, a design method of shunt capacitor series anti-over-voltage protector based on non-linear high- energy zinc oxide valve plate is proposed to solve the problem of insufficient energy and poor energy uniformity of the zinc oxide valve plate in the current over-voltage protector. Firstly, the over-voltage mechanism of capacitor switching and the key point of suppression are analyzed. At last, the performance of the over-voltage protector is verified by the simulation model and the actual circuit. The research results of this paper can provide new ideas for the design of over-voltage protectors, and have certain engineering applicability.