220kV double-interval modular HGIS electric wiring device

Abstract

A 220kV double-interval modular HGIS electric wiring comprises double bus bars arranged outside and a 220kV HGIS distribution device of sectionalized double bus configuration. On the basis of a conventional HGIS dual-row arrangement, a GIL pipeline is adopted to combine two intervals into an HGIS module, a set of bus casings are shared, and a double-break bus disconnector is adopted to be connected with the bus casings. The shared set of bus casings are two spaced SF6-air casings that share a set of connection open buses, and a double-break bus disconnector is adopted for configuration. Through adoption of the double-break bus disconnector, the mutual influence under various working conditions of the two intervals is eliminated, and the free combination of a single main transformer, a line, a bus coupler, a section and a bus set interval is realized.

Description

technical field [0001] The 220kV double-interval modular HGIS electrical wiring device involved in the invention belongs to the technical field of power transmission and transformation engineering design and construction. Background technique [0002] In my country, the 220kV power grid is a backbone grid for load distribution. The 220kV power distribution device generally has the characteristics of an important system position and a large scale of incoming and outgoing lines. The main wiring usually uses double busbars or double busbar segmented wiring. Commonly used 220kV switchgear: ① air insulated switchgear (AIS) type; ② tank circuit breaker type; ③ HGIS type; ④ gas insulated switchgear (GIS) type. ① and ② are generally classified as open equipment, while ③ and ④ are classified as compact equipment. With the development of society and economy, the requirements for substations to save resources and protect the environment continue to increase. Compact equipment has been...

AI Technical Summary

Problems solved by technology

The first is that the power outage of the expansion will affect a large area, and even cause the bus to stop completely; the second is that the risk of air leakage in the bus is high, and the risk of power outage maintenance is high; the third is that the amount of civil engineering works is large and the construction is difficult; outage time, leading to an increase in investment costs in the first phase

Especially in the 220kV and above substations where the power distribution device is arranged outdoors, when the number of 220kV outgoing lines is large, and overhead outgoing lines are mostly used, if GIS devices are used, the busbars often need to be extended, which increases investment and makes it difficult to effectively utilize the advantages of compact GIS layout

[0004] Like GIS, HGIS has the advantages of high equipment integration, advanced technology, compact layout, less maintenance, and long life. It also has the advantages of convenient expansion, short power failure time, and small impact range. Problems such as the doubled number of casings, especially the excessive increase in the occupied area compared with GIS, lead to the limitation of its application

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