Isolating switch (Isolating switch) is a kind of switching device mainly used for "isolating power supply, switching operation, to connect and cut off small current circuit", without arc extinguishing function. When the disconnector is in the sub-position, there is an insulation distance between the contacts that meets the required requirements and a clear disconnection mark; in the closed position, it can carry the current under normal circuit conditions and the abnormal conditions (such as short circuits) within a specified time. Switching device for current. Generally used as a high-voltage disconnector, that is, a disconnector with a rated voltage above 1kV. Its own working principle and structure are relatively simple, but due to the large amount of use and high reliability requirements, it is necessary to design, build and The impact of safe operation is large. The main feature of the disconnector is that it has no arc extinguishing capability, and can only open and close the circuit without load current. The entry introduces the functions, characteristics, types, applications, error prevention improvements, maintenance, common problems, etc. of the isolating switch.
1. After opening the gate, establish a reliable insulation gap, and separate the equipment or line that needs to be repaired from the power supply with an obvious disconnection point to ensure the safety of the maintenance personnel and equipment.
2. Change the line according to the operation needs.
3. It can be used for small currents in split and close lines, such as the charging current of bushings, busbars, connectors, short cables, the capacitor current of switching voltage equalizing capacitors, the circulating current when double busbars are connected, and the excitation current of voltage transformers. Wait.
4. According to the specific situation of different structure types, it can be used to divide and close the no-load excitation current of a certain capacity transformer.