温度继电器检测电动机温度，超过额定温度发出信号，接触器切断主电路，完成电机保护。

Temperature relay tests temperature of motor, if it exceeds rating temperature to send a signal, contactor cut off main circuit to complete protection of motor.

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电动机过载保护通常采用继电器，而配电线路过载保护多采用断路器的长延时过电流脱扣器来完成。

Protection against motor over - load usually adopt thermal relay, but protection against line over - load usually adopt long delay over- current release of circuit- breaker.

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如果一台发电机组没有运转，并且没有逆功率继电器保护，运转的机组就会驱动这个机组，这台机组上的发电机则变成电动机运行。

If one set stops and reverse power protection is not provided, the set still running will drive the set that has stopped. The generator on the set that has stopped will act as a motor.

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