Box-sharing gas-insulated metal enclosed switching device

Abstract

The invention discloses a box-sharing gas-insulated metal enclosed switching device. An upper sealed air box and a lower sealed air box are arranged in a cabinet body; a three-position isolating switch, a main bus casing and a main bus are arranged in the upper air box; an output shaft of a three-position spring operating mechanism extends into the upper air box and is connected with the three-position isolating switch through a rotary sealed connector; the three-position isolating switch is connected with a vacuum circuit breaker in the lower air box through a bus connector; the vacuum circuit breaker is connected with a spring mechanism through a metal corrugated pipe sealing mechanism; the vacuum circuit breaker is connected with an inner conical insulator which is sealed and fixed on the wall of the lower air box through a lead; and the inner conical insulator is inserted into a voltage transformer, a cable joint, a zero sequence transformer and a lightning arrester respectively. The switching device has the characteristics of good sealing effect, long service life, small size and wide application range and is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of high-voltage power transmission and distribution equipment, and in particular relates to a common-box type gas-insulated metal-enclosed switchgear adopting SF6 gas insulation technology. Background technique [0002] Common gas-insulated metal-enclosed switchgear (C-GIS) is a switchgear with SF6 gas as the insulating medium. It is widely used in engineering construction projects with tight land use and high reliability requirements, areas with particularly harsh environments and seriously polluted industries. district power station. It is especially suitable for plateau areas (such as Qinghai-Tibet Plateau), coastal areas with poor meteorological conditions, enterprises with serious pollution (such as chemical plants, cement plants), and places with important loads that cannot be powered off (such as subways and tunnels). [0003] Common box gas insulated metal-enclosed switchgear is an expansion of high...

AI Technical Summary

Problems solved by technology

[0004] In the medium voltage field, especially at the 40.5kV voltage level, conventional switchgears with air as the insulating medium are generally larger in size (the width of the cabinet is not less than 1200mm, and the volume is generally not less than 7 cubic meters), and the weight is relatively heavy (generally not less than 2t). , difficult to operate

Due to the limitations of environmental conditions (such as high altitude, humidity, salt spray, pollution, corrosion, etc.), traditional air-insulated switchgear can no longer meet the requirements of users in metallurgy, petrochemical, mining, and coastal areas; urban subways and light rail, high-rise 35kV gas insulated switchgear must also be used in construction, large enterprises and other occasions due to factors such as floor area and space constraints.

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