Dingchang-high Voltage Switch

The purpose of load switch is corresponding to its structural characteristics. From the structural point of view, there are two main types of load switch. One is independently mounted on the wall and structure, and its structure is similar to that of disconnector; The other is installed in the high-voltage switchgear, especially the one using vacuum or SF6 gas, which is closer to the circuit breaker. The use of load switch is a comprehensive use of the two types of load switch.
1) When the load switch is in the off position, it has obvious disconnection points like the disconnector, so it can play an electrical isolation role. Necessary conditions for reliable power failure shall be provided for the power failure equipment or lines.
2) The load switch has a simple arc extinguishing device, so that the load current within the rated current of the load switch can be opened and closed. It can be used to open and close transformers, capacitor banks and distribution lines of a certain capacity. Some workshop transformers are far away from the circuit breakers in the high-voltage distribution room, so there is no obvious disconnection point in the workshop transformer room during power failure. A high-voltage load switch is often installed on the wall of the transformer room, which can not only operate the no-load current of the transformer nearby, but also provide obvious disconnection points to ensure the safety and reliability of power failure.
3) Load switch equipped with high-voltage fuse can be used as circuit breaker with limited breaking capacity. At this time, the load switch itself is used to open and close the load current under normal conditions, and the high-voltage fuse is used to cut off the short-circuit fault current. However, most of the load switches here are vacuum type or sulfur hexafluoride type. The entire ring network cabinet is small, and the maximum capacity can be ***0KVA transformer.