Gas-insulated high-capacity combined switch device with metal shell

Abstract

The invention provides a gas-insulated high-capacity combined switch device with a metal shell. The device adopts a three-phase independent structure and is sealed by a non-magnetic metal shell, and insulation gas is filled in the device. Each phase comprises 2-4 mutually and tightly coupled inductors and 2-4 breakers which are connected in parallel, wherein each inductor consists of inductance coils. Components such as an isolating switch, a grounding switch, a voltage mutual inductor, a current mutual inductor, and the like are added into the combined device as required to form the compactlyconfigured high-capacity combined switch device which is adaptive to a transformer substation. The components in the device can be divided into different gas inflation units through gas insulation valves so as to ensure that the gas pressure and the gas types of different gas inflation units can be configured differently as required. The invention is sealed by adopting the gas insulation with high electrical strength and the metal shell so as to ensure that the overall volume of an original open type combination of the inductors and the breakers insulated by air is reduced, and has more safety and stability and is not easily disturbed by external environment.

Description

technical field [0001] The invention relates to a gas-insulated large-capacity combined switchgear with a metal shell, which belongs to the field of power transmission and distribution. Background technique [0002] With the continuous strengthening of power system networking, the short-circuit capacity of the system is getting larger and larger, even exceeding the rated breaking current of the high-voltage circuit breaker, which seriously restricts the construction and development of the power grid. In addition, when a port short circuit occurs in a large-capacity generator, the resulting short-circuit current will also exceed the breaking capacity of the current high-voltage circuit breaker. According to calculations, when there is a short circuit at the outlet end of the Three Gorges generator set, the short circuit current can reach 300kA, while the breaking current of the existing domestic 500kV circuit breaker can only reach 63kA, and the foreign vacuum circuit breaker...

AI Technical Summary

Problems solved by technology

In order to ensure insulation, the coil insulation of the reactor uses a very thick insulating material, which increases the volume and cost of the reactor

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