High-voltage isolation switch having ice melting short circuit and normal function switching, and switching method

Abstract

The invention provides a high-voltage isolation switch having ice melting short circuit and normal function switching, and a switching method. The high-voltage isolation switch comprises a mounting rack, and the mounting rack is provided with a short circuit switch operation mechanism. The top part of the mounting rack is provided with a horizontal rack, and the upper part of the horizontal rack is provided with a three-phase high voltage isolation switch body. One end of the rotating porcelain bottle of the three-phase high voltage isolation switch body is provided with a three-phase short circuit isolation switch body. The three-phase short circuit isolation switch body is provided with a short circuit moving contact and a short circuit static contact. The short circuit moving contacts of the three-phase short circuit isolation switch body are respectively connected to a corresponding rotation bearing seat through different rotating porcelain bottles. The rotation bearing seat at the other end of the C-phase high-voltage isolation switch body is connected to a first vertical connecting rod through a first operation pulling rod, and the first vertical connecting rod is connected to a short circuit switch operation mechanism. The invention also provides a switching method of the high-voltage isolation switch having ice melting short circuit and normal function switching. The invention is advantageous in that the ice melting short circuit and the normal functions (like running and grounding) can be quickly switched.

Description

Technical field [0001] The present invention mainly relates to the technical field of high-voltage switches, in particular to a high-voltage isolation switch with ice melting short circuit and conventional function switching and a switching method thereof. Background technique [0002] At present, in the typical design of China Southern Power Grid, there is no bypass bus in 110kV and 220kV substations. When the DC ice melting device is installed in these substations, two unavoidable problems will be encountered: First, the ice melting bus on the output side of the DC ice melting device cannot be directly connected to the first end of the ice melting line; At the end of the line, there is no special short-circuit device that can pass ice melting current. This directly leads to a very low work efficiency in the entire ice melting process: about 44% of the time is spent on the short circuit at the beginning and end of the line. The current common practice is to build the ice-melti...

AI Technical Summary

Problems solved by technology

When installing DC ice-melting devices in these substations, two unavoidable problems will be encountered: First, the ice-melting bus on the output side of the DC ice-melting device cannot be directly connected to the head end of the ice-melting line; At the end of the line, there is no special short-circuit device that can pass the ice-melting current

Second, the space for connecting the DC ice-melting bus and the ice-melting line is limited. If a connecting device is installed between the ice-melting bus and the ice-melting line, it is necessary to expand the land acquisition of the site

[0003] In the existing working mode, the above operations are all carried out manually (according to the actual experience on site, the time to complete a short circuit of a 110kV and below transmission line and to remove the short circuit is generally about 0.5-1 hour). This method leads to low efficiency of ice melting work and high safety risks for maintenance personnel in on-site operations

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