黑启动初始阶段，小系统空载运行的情况下，由于逆功率保护而往往发生机组并车失败问题。
When a small system is in on-load operation in the early stage of black start, unit paralleling may fail due to reverse power protection.
逆功率继电器的可靠性直接关系到大中型发电机变压器组的安全运行。
Reliability of reverse-power relay is of immediate effect on the secure operation of large and medium generator-transformer units.
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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