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据统计,三相交流电动机由于单相运转故障导致烧坏的数量占电动机损坏总数的70％以上,对于连续长期运转的电动机比例更高。因此,电动机“单相保护”,有的称为“断相保护”一直是国内外颇为注重的电工技术课题之一。过去国内外报道的单相保护原理及线路归纳起来有: 属于“温度原则”的直接式全热保护(热敏电阻及埋入式温度继电器)和间接模拟式热继电器及差动式热继电器的单相运转保护。
According to statistics, three-phase AC motor due to single-phase operation failure caused the number of burnout accounted for more than 70% of the total number of motor damage, for a long time continuous operation of the motor a higher proportion. Therefore, the motor “single-phase protection”, and some known as the “phase failure protection” has been the focus of electrical engineering at home and abroad one of the topics. Past single-phase protection at home and abroad reported the principle and circuit summarized as follows: the “principle of temperature” direct thermal protection (thermistor and embedded temperature relay) and indirect analog thermal relay and differential thermal relay Single-phase operation protection.