新型弧后介质恢复强度测量系统

New Measurement System for Dielectric Recovery after Arc Extinction

断路器弧后介质恢复特性的准确测量,能为其开断性能研究和自身优化设计提供依据。基于现有断路器弧后介质恢复特性测量装置及方法,大多采用单点测量或脉冲能量不可控的多点测量方法,难以避免开断过程燃弧的随机性对介质恢复特性或外施脉冲电压对弧后介质恢复特性的影响,缺乏单脉冲能量可控的多点测试技术及装置。提出了一种新型纳秒弧后介质恢复特性测量方法,制作了纳秒脉冲弧后介质恢复强度测量装置,实现了前沿80 ns、脉宽230 ns、幅值最高10 kV、频率最高500 kHz、单脉冲能量最大8 mJ的探测脉冲的输出。经开断实验,验证了装置的可行性,为低压电器介质恢复测量提供了一种更加精确、过程可控的定量分析手段。

The accurate measurement of the dielectric recovery characteristics of the circuit breaker after arc extinction can provide the basis for its breaking performance research and self optimization design.However,most of the existing devices and methods for measuring the dielectric recovery characteristics of circuit breakers adopt single point measurement or multi-point measurement methods with uncontrollable pulse energy.Correspondingly,it is difficult to avoid the influence of the randomness of arc ignition on the dielectric recovery characteristics during the interruption process,or to avoid the impact of external pulse voltage on the dielectric recovery characteristics.There is a lack of multi-point testing technology and equipment with controllable single pulse energy.A new nanosecondmethod for measuring the dielectric recovery characteristics after arc extinction was proposed.According to this method,a nanosecond pulse device for measuring the dielectric recovery strength was designed and manufactured.The device has the following characteristics,80 ns leading edge,230 ns pulse width,max 10 kV amplitude,max 500 kHz frequency,max 8 mJ single pulse energy.The feasibility of the device is verified by breaking experiment,it can provide a more accurate and controllable quantitative analysis method for dielectric recovery measurement of lowvoltage electrical apparatus.