High voltage disconnector is an important switching appliance in power plant and substation electrical system, which needs to be used together with high voltage circuit breaker. Isolation switch is suitable for three-phase AC 50Hz, rated voltage 10KV-110KV outdoor device. It is used to connect, cut off or change the line of high voltage equipment under the condition of voltage and load. Its main function is: to ensure the safety of high voltage appliances and devices in maintenance work, play the role of isolating voltage, can not be used and cut off, put into the load current and open short circuit current, can only be used for some switching operations that do not produce strong arc, that is, it does not have the function of arc extinguision; According to the installation location, it is divided into indoor and outdoor type, and according to the number of insulation pillars, it is divided into single column, double column and three column, and there are optional equipment for each voltage level. How it works

High voltage isolation switch to ensure the safety of high voltage electrical appliances and devices in maintenance work, play the role of isolation voltage, can not be used and cut off, input load current and open short circuit current, can only be used for some switching operations that do not produce strong arc, that is, it does not have the function of arc extinguision; According to the installation location, it is divided into indoor and outdoor type, and according to the number of insulation pillars, it is divided into single column, double column and three column, and there are optional equipment for each voltage level. It can also isolate the part that needs to be cut off from the live part in the high voltage distribution device reliably to ensure the safety of maintenance work. The contacts of the high voltage isolating switch are all open in the air, with obvious breaking point. The isolating switch has no arc extinguision device, so it cannot be used to cut off the load current or short circuit current. Otherwise, under the action of high voltage, the breaking point will produce strong arc, and it is difficult to extinguiate by itself, and may even cause arcing (relative or phase short circuit), burn the equipment and endanger personal safety. This is the so-called "load pull isolation switch" serious accident.

High voltage disconnector can also be used to switch some circuits to change the operation mode of the system. For example, in a two-bus circuit, a high-voltage isolator can be used to switch the circuit in operation from one bus to the other.