Live replacement method for static contact of 220 kV flexible busbar

Abstract

The invention relates to the field of GW6 series alternating high-voltage isolating switches of a flexible busbar in a power grid 220 kV substation and particularly relates to a live replacement method for a static contact of the 220 kV flexible busbar. The live replacement method for the static contact of the 220 kV flexible busbar is characterized in that operation persons ascend to the position below the flexible busbar along an insulation herringbone ladder and subject the static contact of the flexible busbar to live replacement by means of using an idiostatic method to transfer potentials, and the live replacement method includes a detachment step and an installation step. Compared with replacement methods in prior art, the live replacement method for the static contact of the 220 kV flexible busbar has the advantages that the insulation herringbone ladder is used as an insulation manned platform and meets the requirement of an equipotential operation method, and the insulation herringbone ladder is small in size, can be lifted below the flexible busbar, and is applicable to live replacement operation for static contacts of GW6 series sing-column and double-column vertical opening type isolating switches of the 220 kV flexible busbar; the live replacement method is capable of promoting scientific and technological progress and has obvious social benefits and economical benefits; and the live replacement method fills the gap in the live replacement projects of the static contacts of the isolating switches and has a broad application prospect and a popularization value in national grid systems.

Description

technical field [0001] The invention relates to the field of GW6 series AC high-voltage isolating switches for flexible buses in 220kV substations of a power grid, in particular to a method for replacing static contacts of 220kV flexible buses with electricity. Background technique [0002] GW6 series single-column and double-column vertical opening type disconnectors are generally installed under the overhead soft busbars of 220kV substations. They are used for maintenance and section isolation, switching lines according to needs, splitting and closing no-load lines, and automatic fast isolation. Isolation of the fracture, clear separation and closing state, and the advantages of inspection. In addition to saving the floor area, it can also reduce the lead wires and reduce the investment of the power station. Therefore, it is more common in domestic 220kV substations. [0003] Substations in normal operation have two wiring methods: double busbar and single busbar. Due to t...

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Problems solved by technology

[0004] When connecting double busbars, the operator of the substation can only take the method of inverting the busbars, switching the power load to another busbar or sending it by bypass. Since dozens to hundreds of operations need to be done, the procedures are complicated and misoperation accidents are prone to occur , increasing the probability of operating personnel safety risks

[0005] In the case of single-bus connection, substation operators can only use bypass to send

Since the distance between the moving contact of the switch and the static contact of the soft bus is only 2.56 meters, the safety distance between the crane and the soft bus is lower than the standard of electric safety regulations, the crane cannot be hoisted, and the maintenance personnel cannot perform maintenance work. The 220kV single bus of the substation Maintenance or replacement can only be done if all the power is cut off, which will affect the reliability of system security and power supply

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