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Date：08-31-2022
The load switch is a switching device between the circuit breaker and the isolation switch. It has simple arc extinguishing equipment, which can block extra load current and certain overload current, but cannot block short-circuit current. The load switch can switch on and off the load current, excitation current, charging current and capacitor bank current under normal operating conditions.
1) Vacuum-type high-voltage load switch: the use of vacuum medium to extinguish the arc, the electric life is long, the relative price is relatively high, and it is suitable for commodities of 220 kV and below.
2) Oil-immersed high-voltage load switch: It uses the energy of the arc itself to decompose and vaporize the oil around the arc and cools and suspends the arc.
3) Sulfur hexafluoride type high-voltage load switch: using sulfur hexafluoride gas to extinguish the arc, its breaking current is large, and the function of breaking capacitor current is good, but the structure is relatively messy, and it is suitable for products of 35 kV and above.
4) Compressed high-voltage load switch: It uses the compressed air of the piston during the breaking process to blow out the arc, and its structure is relatively simple, and is suitable for products of 35 kV and below.
5) Solid gas-generating high-voltage load switch: Use the energy of breaking the arc itself to make the gas-generating material in the arc chamber generate gas to blow out the arc. Its structure is relatively simple, and it is suitable for products of 35 kV and below.
6) Compressed air type high-voltage load switch: the use of compressed air to blow out the arc can interrupt a large current, and its structure is relatively messy, suitable for products of 60 kV and above.
