Structural characteristics of high voltage load switches

High voltage load switch is a kind of high voltage electrical equipment which is specially used to turn on and off load current. With the release device, it can also trip automatically in the case of overload. But it only has a simple fire extinguishing device, so it cannot cut off the short circuit current. In most cases, the load switch is connected in series with a high voltage fuse, with which the short circuit current is cut off. Divided into indoor and outdoor. For example, the shape of the indoor high-pressure load switch is similar to that of the disconnecting switch. With arc extinguishing device, etc

What is the difference between high voltage load switch and disconnecting switch?

Disconnecting switch is a kind of switching equipment without arc extinguishing device, which is mainly used to disconnect the circuit without load current, isolate the power supply, and have obvious disconnecting point in the switching state, so as to ensure the safety maintenance of other electrical equipment. In the closed state can pass the normal load current and short circuit fault current reliably. Because it has no special arc extinguishing device, can not cut off the load current and short circuit current. Therefore, the disconnector can be operated only when the circuit is disconnected by the circuit breaker. Do not operate the disconnector with a load to avoid serious equipment and personal injury. Only voltage transformers, arresters, no-load transformers whose excitation current does not exceed 2A, and no-load lines whose current does not exceed 5A can be operated directly with disconnectors.

Load switch is a switch between circuit breaker and disconnecting switch, with a simple arc extinguishing device, can cut off rated load current and certain overload current, but can not cut off short circuit current.

How to choose the size of high voltage load switch?

The selection of a high-voltage load switch is basically the same as that of a circuit breaker. It must meet five conditions: rated voltage, rated current, cut-off current, limit current and thermal stability.