All-solid insulating vacuum circuit breaker

Abstract

The invention discloses a metal-enclosed all-solid insulating vacuum circuit breaker and particularly relates to an outdoor all-solid insulating pole-mounted vacuum switch. The all-solid insulating vacuum circuit breaker refers to that a fixed installing portion of a primary electrified body is formed by fixedly sealing purpose-made normal-temperature curing silicone rubber high in insulation performance in a metal box by means of integral one-time vacuum pouring; a movement portion of the primary electrified body comprises three-phase vacuum arc-extinguishing chamber moving contact terminals, flexible couplings, dynamic insulating pull rods and output insulating shafts and is formed by sealing another purpose-made normal-temperature curing silicone rubber high in insulation performance in cavities of epoxy resin insulating supporting frameworks by means of split-phase vacuum pouring. The all-solid insulating vacuum circuit breaker has the advantages that the primary electrified body of the circuit breaker is in all-solid seal and all-solid insulation integrally; metal partitions and silicon rubber are added among three phases for insulation, so that the three phases only have voltage to earth, line-to-line insulating voltage strength is reduced, and the overall insulation service life of the circuit breaker is prolonged; the silicon rubber insulation materials are environment friendly and recyclable, and accordingly, the all-solid insulating vacuum circuit breaker creates a new situation for environment friendliness, recycling and reusing of circuit breaker equipment.

Description

technical field [0001] The invention relates to the technical field of electric equipment, in particular to an outdoor pole-mounted vacuum circuit breaker. Background technique [0002] The switch on the column is one of the most widely used main electrical equipment in the power distribution network system, and it is also a necessary electrical equipment for the intelligent distribution network. At present, among the outdoor switches used in the field of medium-voltage distribution networks known in the country, one is mainly air-insulated, such as ZW8, ZW32, etc., because they are extremely susceptible to outdoor environments such as temperature, humidity, pollution, and rain. During the operation of the equipment, the main insulation is reduced or fails, and the operating mechanism is also prone to corrosion, jamming and failure, and the failure rate of the equipment is very high. Moreover, the switch on the air-insulated column is bulky, requires maintenance, and is not...

AI Technical Summary

Problems solved by technology

At present, among the outdoor switches used in the field of medium voltage distribution networks known in the country, one is mainly air-insulated, such as ZW8, ZW32, etc., because they are extremely susceptible to outdoor environments such as temperature, humidity, pollution, and rain. During the operation of the equipment, the main insulation is reduced or fails, and the operating mechanism is also prone to rust, jamming and failure, and the failure rate of the equipment is very high.

Moreover, the switch on the air-insulated column is bulky, requires maintenance, and is not universal among different products, which makes the operation and maintenance cost high

It cannot meet the new high reliability requirements of the smart grid for vacuum circuit breakers; the second type is based on SF6 gas insulation, such as ZW20, etc. SF6 gas insulation cannot be used in plateaus and extremely cold regions, and insulation after SF6 gas leakage Falling will easily cause equipment explosion, and SF6 is a greenhouse gas, which is not environmentally friendly and difficult to recycle

SF6 pole-mounted switch is bulky and heavy, and the outlet method can only be horizontal outlet, which limits the installation and maintenance methods; the third type is a composite insulation method that rarely uses epoxy resin and air, and mainly uses a vacuum interrupter. Solid-sealed pole-injection technology, epoxy resin insulation reduces the volume of the switch, but due to heat curing, it is easy to cause damage to the charged body or cracking of the insulation layer due to thermal expansion and contraction, and epoxy resin is not environmentally friendly and cannot be recycled. Adding a buffer layer makes the partial discharge larger, which is easy to cause a breakdown of the operating insulation

In addition, the moving contact end of the arc extinguishing chamber, the flexible connection, and the dynamic insulating rod are still exposed to the air, and will also be adversely affected by external environmental factors to varying degrees.

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