A double-break isolating switch with grounding linkage

Abstract

A double-break isolating switch having grounding linkage, comprising a housing, double-break switch devices, an isolating switch driving device, grounding switch devices, a grounding switch driving device, a grounding switch transmission mechanism, and a linkage device. The double-break switch devices are mounted inside the housing and implement synchronous opening or closing of breaks on both sides by means of the isolating switch driving device; the grounding switch devices are mounted on the housing to perform grounding opening / closing control on the double-break switch devices and implement closing or opening by means of the grounding switch driving device and the grounding switch transmission mechanism; the linkage device is connected to the isolating switch driving device and the grounding switch driving device respectively, so that the grounding switch devices can be closed only when the double-break switch devices are in an open state, or the double-break switch devices can be closed only when the grounding switch devices are in an open state.

Description

Technical field [0001] The invention relates to the field of equipment for converter stations / substations with voltage levels of 220 kV and above, and more specifically, to a double-break isolating switch with grounding linkage. Background technique [0002] Isolating switch (commonly known as "knife switch"), generally refers to a high-voltage isolating switch, that is, an isolating switch with a rated voltage above 1kV, usually referred to as an isolating switch, which is the most used electrical appliance in high-voltage switching appliances, and its own work The principle and structure are relatively simple, but due to the large amount of use and high reliability requirements, it has a greater impact on the design, establishment and safe operation of substations and power plants. The main feature of the isolating switch is that it has no arc extinguishing ability and can only open and close the circuit when there is no load current. Isolation switches are used at various lev...

AI Technical Summary

Problems solved by technology

[0004] The first stage: The traditional GIS switch design generally regards the isolation switch and the grounding switch as two independent functional units. At present, many mainstream manufacturers still adopt this design. Mis-closing the grounding knife switch when the gate is live and avoiding closing the isolation knife switch when the grounding knife is closed and grounded can only be controlled by electrical interlocking. If the electrical interlocking circuit fails or is unlocked by mistake, it may cause the grid line to trip. ACCIDENT

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