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数十年前提出“检同期”这一概念是指2个完全独立电源的同期。由于当时的系统较简单,控制技术也很落后,“检同期”实质上变成单一的检相角差,即利用一个同期闭锁继电器
The concept of “checking the contemporaneous period” put forward decades ago refers to the same period of two completely independent sources of power. Because at the time of the system is relatively simple, control technology is also very backward, “check the same period ” essentially become a single phase angle difference, that is, using a synchronous latch relay