摘要
强迫换流结束时刻真空开关两端电压会以阶跃形式上升至较大幅值,过大的电压峰值及变化率会直接增大弧后触头表面的电场强度及功率密度,从而影响其分断可靠性。本文旨在通过真空开关串联二极管及并联RC吸收支路的试验方案达到显著减小真空开关电压变化率的目的,依次开展了23kA电流等级分断试验,并探究二极管有无RC吸收支路对试验结果的影响,最后基于MATLAB/simulink仿真软件选取真空开关吸收支路的参数,并将仿真与试验结果对比,验证了方案的合理性与有效性。
At the end of the forced communication, the voltage across the vacuum switch will leap up to the largest amplitude. Excessive voltage peaks and change rate directly increase the electric field strength and power density of the contact after arcing, which affects its breaking reliability. A DC breaker scheme of the vacuum switch connecting a diode in series and connecting the RC absorption branch in parallel is designed. The 23 kA current level breaking test is carried out in turn, and the effect of diode with or without RC absorption branch on the test results is explored. Finally the absorption branch parameters of the vacuum switch are selected based on the MATLAB/simulink simulation. The rationality and effectiveness of the scheme is verified by comparing the simulation to te experiment.
作者
李博
彭振东
杨晨光
任志刚
Li Bo;Peng Zhendong;Yang Chenguang;Ren Zhigang(Wuhan Institute of Marine Electric Propulsion,Wuhan 430064,China)
出处
《船电技术》
2019年第8期23-26,共4页
Marine Electric & Electronic Engineering
关键词
强迫换流
分断可靠性
电压变化率
吸收支路
forced commutation
breaking reliability
voltage change rate
absorption branch
