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狮子岩水电站是我县水电系统骨干电站,装机三台,每台机容量均为3200kW;有两台主变,其容量分别为8000kVA 和5000kVA;有一条35kV 线路连结县城中心变电站。因运行方式的改变,使得这条唯一的35kV 线路继电保护整定值也要作相应的改变。笔者根据运行方式的改变,两台主变在投切不同的位置时,使用它们在38.5kV 侧的跳、合闸位置中间继电器来实现这条线路的过电流保护装置自动切换,从而达到具有不同的整定值。现将主结线图及这条线路保护控制电路分别用图1和图2来表示。
Shiziyan Hydropower Station is the backbone of hydropower station in my county, installed three units, each machine capacity is 3200kW; has two main transformer, its capacity respectively 8000kVA and 5000kVA; has a 35kV line connecting the county center substation. Due to changes in operating mode, making the only 35kV line protection settings have to be changed accordingly. The author according to changes in mode of operation, the two main changes in the cast different locations, the use of them in the 38.5kV side of the jump, closing the position of the middle relay to achieve this line overcurrent protection device automatically switches to achieve different The setting value. The main line graph and this line protection control circuit are shown in Figure 1 and Figure 2.