Classification and function of high voltage isolation switch

The operating principle and structure of the high-voltage isolation switch is relatively simple, but due to the large amount of use, the work reliability is required to be high, so the impact on the design, establishment and safe operation of the substation and the power plant is large. The main features of the disconnecting switch are: no arc extinguishing ability, and the circuit can only be divided and combined without load current.

High-voltage isolation switch according to the different installation methods, can be divided into outdoor high-voltage isolation switch and indoor high-voltage isolation switch. Outdoor high-voltage isolation switch can withstand the effects of wind, rain, snow, pollution, condensation, ice and thick frost, and is suitable for high-voltage isolation switch installed on the terrace. According to the difference of the insulating pillar structure can be divided into single column isolation switch, double column isolation switch, three column isolation switch. Among them, the single-column isolating switch directly uses the vertical space as the electrical insulation of the fracture under the overhead busbar. Therefore, it has the obvious advantage that it saves the floor space, reduces the lead wire, and at the same time, the state of the closing and closing is particularly clear. In the case of EHV power transmission, the use of single-column disconnectors in substations will have a significant effect in saving floor space.

The main function of the high and low pressure isolation switch is as follows:

1. After the gate is opened, establish a reliable insulation gap, and separate the equipment or circuit that needs to be repaired from the power supply with an obvious disconnection point to ensure the safety of maintenance personnel and equipment.

2, according to operational needs, change the line.

3, can be used to divide and match the small current in the line, such as the charging current of bushings, busbars, connectors, short cables, the capacitive current of the switching voltage-sharing capacitor, the circulation current when the double busbar is switched, and the excitation current of the voltage transformer. Wait.