Isolating switch, that is, when in the sub-position, there is an insulation distance and an obvious disconnection mark between the contacts; when in the closed position, it can carry the current under normal loop conditions and abnormal conditions (such as short-circuit) within the specified time Switching device under current.
Isolating switch generally refers to high-voltage isolating switch, that is, the isolating switch with a rated voltage of 1kV and above, usually referred to as isolating switch, which is the most used electrical appliance in high-voltage switching appliances, and its working principle and structure are relatively simple , But due to the large amount of use and high reliability requirements, it has a greater impact on the design, establishment and safe operation of substations and power plants. The main feature of the isolating switch is that it has no arc extinguishing ability and can only open and close the circuit when there is no load current. Isolating switch is used at various levels of voltage to change the circuit connection or isolate the circuit or equipment from the power supply. It has no current interruption capability and can only be operated after disconnecting the circuit with other equipment. Generally, it is equipped with an interlock device to prevent the switch from being operated incorrectly when the switch is under load. Sometimes a pin is needed to prevent the switch from being disconnected under the action of a large fault magnetic force.