1) After opening, establish a reliable insulation gap, and separate the equipment or lines that need to be overhauled from the power supply with an obvious disconnection point to ensure the safety of overhaul personnel and equipment.
2) Change the line according to operational needs.
3) It can be used to divide and combine the small currents in the circuit, such as the charging current of bushings, bus bars, connectors, short cables, the capacitance current of the switching voltage equalizing capacitor, the circulating current during double bus switching and the excitation current of the voltage transformer Wait.
4) According to the specific conditions of different structure types, it can be used to divide and combine the no-load excitation current of a certain capacity transformer.
According to different installation methods, high-voltage isolating switches can be divided into outdoor high-voltage isolating switches and indoor high-voltage isolating switches. Outdoor high-voltage isolating switch refers to a high-voltage isolating switch that can withstand the effects of wind, rain, snow, dirt, condensation, ice, and thick frost, and is suitable for installation on the terrace. According to the different insulation pillar structure, it can be divided into single-pillar isolating switch, double-pillar isolating switch, and three-pillar isolating switch. Among them, the single-column knife switch directly uses the vertical space as the electrical insulation of the fracture under the overhead bus. Therefore, it has obvious advantages of saving floor space, reducing lead wires, and the opening and closing state is particularly clear. In the case of ultra-high voltage power transmission, the effect of saving floor space is more significant after the single-column knife switch is adopted in the substation.
In low-voltage equipment, it is mainly suitable for low-voltage terminal power distribution systems such as houses and buildings. Main function: Breaking and connecting lines with load