Nuclear phase method for totally-closed GIS system

Abstract

The invention discloses a nuclear phase method for a totally-closed GIS system, and the GIS system comprises two incoming overhead lines which are respectively the first incoming line and the second incoming line. The method comprises the steps: cutting off a drainage line of the two overhead lines; enabling the first and second incoming liens and all buscouples and segments in the GIS system to operate with no need of an additional power supply, switching on all incoming line switches and two isolation knife switches, wherein the feed lines of the two isolation knife switches are connected with a bus; separating grounding lines of incoming line PTs at the first and second incoming line PTs, and remotely measuring grounding and inter-phase insulation resistances at the separated grounding lines, so as to determine the phase sequence of the GIS system. The invention also discloses a nuclear phase method between the overhead line incoming wire and bus of the GIS system. The invention also discloses the GIS system with the incoming line being a transformer, and a nuclear phase method among internal buses. The method can improve the nuclear phase efficiency, and reduces the nuclear phase cost.

Description

technical field [0001] The invention relates to the technical field of substations, in particular to a nuclear phase method for a fully enclosed GIS system. Background technique [0002] GIS (GasIsolatedSwitchgare, gas isolation switch station) refers to the abbreviation of combined electrical appliances consisting of circuit breakers, isolating switches, grounding switches, transformers, lightning arresters, busbars, connectors and outlet terminals, all of which are enclosed in metal grounding In the outer casing, there is a certain pressure of SF6 (sulfur hexafluoride) insulating gas inside. [0003] The current method for GIS system phase verification is to disassemble the cable terminal of the GIS system, then connect the cable terminal to the phase phase verification system for phase verification, and then install the cable terminal and fill it with sulfur hexafluoride gas. This kind of method that the cable terminal must be removed to carry out power outage nuclear ph...

AI Technical Summary

Problems solved by technology

This kind of method that the cable terminal must be removed to carry out power outage nuclear phase work, the phase nuclear process is more cumbersome, increases the workload of the phase core, leads to the increase of the cost of the core phase of the closed GIS system; and will increase the cable terminal of the closed GIS system. The sealing problem brought about by the disassembly process leads to poor sealing performance of the GIS system, lower insulation performance, and easy to cause electric shock accidents, resulting in prolonged commissioning time of the substation

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