Environment-friendly gas insulation ring main unit

Abstract

The invention discloses an environment-friendly gas insulation ring main unit. The environment-friendly gas insulation ring main unit is characterized by comprising an air tank, wherein the air tank is internally provided with a vacuum circuit breaker and an isolating switch; the vacuum circuit breaker is provided with a static contact knife which is matched with a movable contact knife of the isolating switch; when the static contact knife and the movable contact knife are disconnected, two fractures are formed; the movable contact knife comprises an upper knife holder and a lower knife holder, which are arranged separately; the upper knife holder is in sliding connection with a sliding contact; when the static contact knife and the movable contact knife are at a closed state, the sliding contact is guided by the static contact knife to generate sliding and is in contact with the lower knife holder to form a closed point; the upper knife holder is provided with an elastic part for enabling the sliding contact to generate resetting tendency when the static contact knife and the movable contact knife are disconnected. By adopting the environment-friendly gas insulation ring main unit, a disconnection insulating performance of the isolating switch is improved so that the requirements on the insulating performance when environment-friendly gas is used as an insulating medium are met.

Description

technical field [0001] The invention relates to the technical field of electrical switchgear, and more specifically relates to an environment-friendly gas-insulated ring network cabinet. Background technique [0002] In the current power supply network system in my country, in order to improve the reliability of power supply, the power supply network is usually connected into a ring, so that users can obtain power from two directions. This power supply method is called ring network power supply for short. The ring network cabinet in the ring network power supply equipment is the core switchgear, and the ring network cabinet can be divided into air type ring network cabinet, SF6 gas insulated ring network cabinet, solid insulated ring network cabinet and so on according to the difference of insulating medium. [0003] Existing gas-insulated ring network cabinets mainly use SF6 gas. Since SF6 was designated as a greenhouse gas at the Kyoto Conference on Global Warming Preventi...

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Problems solved by technology

[0004] However, since the insulation performance of existing environmentally friendly gases such as nitrogen and dry air is far lower than that of SF6 gas, and in order to meet the requirements of being able to merge with the user's existing SF6 ring main unit, the size of the gas box should be kept as small as possible. Therefore, it is necessary to improve the insulation capacity of the disconnector to solve the problem of insufficient insulation performance

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