Air switch cabinet

Abstract

The invention relates to an air switching device, in particular to a switching device using air insulation. The switch cabinet of the invention comprises a cabinet body which is provided with a secondary chamber, an air tank, a mechanism compartment and a cable chamber, wherein the secondary chamber is arranged on the top end of the cabinet body; the air tank and the mechanism compartment are arranged in the middle of the cabinet body; the cable chamber is arranged at the low end of the cabinet body; and the air tank is a sealed tank and is filled with air. The cabinet body of the device has the advantages of small size, environmental protection, long service life, strong adaptability in bad environments, low maintenance frequency, high reliability, high expansibility and the like.

Description

technical field [0001] The invention relates to a switchgear, in particular to a switchgear using gas insulation. Background technique [0002] At present, with the development of social economy, a large number of newly built or expanded urban substations are limited by the building area, requiring the floor space of power distribution devices to be further reduced. In order to meet this requirement, power equipment is gradually developing in the direction of intelligence, intensification and economy. The prefabricated box-type substation technology has been developed by leaps and bounds due to its outstanding advantages such as small size, high degree of intensification, small investment, and fast construction. In order to meet the compact and reliable requirements of box-type substations for high-voltage switchgear, various new types of high-voltage switchgear for box-type transformers are emerging, among which the new generation of switchgear products represented by SF6 ...

AI Technical Summary

Problems solved by technology

[0005]2. SF6 will decompose and form low-fluorine sulfur compounds during arc discharge. This compound is not only poisonous, but also corrosive to some insulating materials and metals. Will cause damage to its internal metal mechanism and affect product reliability

[0006]3. SF6 can only maintain gaseous state when the temperature is higher than -45°. Under normal use conditions, it has the possibility of liquefaction, so SF6 cannot temperature and low pressure

[0007]4. SF6 gas insulated switchgear utilizes the excellent cooling arc characteristics of SF6 gas, so that the built-in disconnector has a certain load breaking capacity, but this This kind of switch allows fewer times of breaking with load. Under normal circumstances, the number of mechanical breaking is about 2000 times, and the number of breaking with load is about 200 times. It has no short-circuit breaking function.

In order to reduce the size and cost, the switchgear generally adopts the structure of multiple functional units in the same box. When a unit in the inflatable box exceeds its service life, other units in the switchgear that are in the same box as the normal operation must also Replacement together, resulting in a serious waste of resources

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