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我厂电动机原来全部采用JR系列热继电器作为过流和单相运转保护,外线路短路则由DZ_4、DZ_(10)系列自动空气断路器保护。自投产以来,发现有下列问题:
All the original motors of our factory adopted JR series thermal relay as overcurrent and single phase operation protection, while the external circuit short circuit was protected by DZ_4 and DZ_ (10) series automatic air circuit breakers. Since it was put into production, the following problems have been found: