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发电机投入并列运转时,自同期所需时间及电压下降程度不但决定于转速差率而且与发电机投入时机组之加速度大小及正负有关。怎样根据转速差率来选择合閘时间,这一问题可借助于週波差继电器01获得圆满的解决。这种週波差继电器是中央电工科学试验所研究出来的,已由工厂大量生产。比较复杂的问题是怎样来选择起动特性曲线亦即怎样选择机组起动方式,使机组在接近同期转速时不会出现过高的加速度。
When generators are put into parallel operation, the time required from the same period and the voltage drop are not only determined by the speed difference but also related to the magnitude of the acceleration and the positive and negative of the unit when the generator is put into operation. How to choose the closing time according to the speed difference, this problem can be solved by means of the weekly difference relay 01. This kind of cycle difference relay is researched by Central Electrotechnical Laboratory and has been mass-produced by the factory. The more complex issue is how to choose the starting characteristic curve that is how to select the starting mode of the unit so that the unit will not over-acceleration when approaching the same speed.