晶闸管开关电路在低压电器电寿命试验中的应用与分析

摘要

The non-contact thyristor circuit was specified for nonphysical breaking of big test current.In this case it not only has the function of a common mechanical switch as accompanied test samplem(ATS)but also helps to save hardware investment and human maintenance costs,and increases the test efficiency.The SCR thyristor circuit,based on the modification of existing motor-controlled softstarter,was used as silicon-control component. During the period of thyristor circuit modification,the voltage conversion peak and current multi-“zero-crossing”phenomena occurr because of SCR circuit conversion.The root reasons of these phenomena were analyzed and a software design of filtering waveform was specified to optimize the waveform,with which the actual problem is solved.Finally,with the multi-tests comparison between different calculation method,the practicability of the ATS circuit modification and correctness of software filtering method were validated.%采用晶闸管开关电路对较大过程试验电流进行无触点式非物理分断，替代机械开关实现了试验电路中陪试品的功能，极大地降低了产品试验站的硬件投入和人力维护成本，提高了测试效率。分析采用软件滤波的方式实现了波形的优化处理，解决了实际中的问题。最后通过试验，验证了该改造陪试电路的可行性和相应软件滤波方法的正确性。