Double-side grounding type online testing system and testing method for switchgear

Abstract

The invention discloses a double-side grounding type online testing system and a double-side grounding type online testing method for switchgear, which relate to the technical field of power equipmenttests, and particularly to the double-side grounding type online testing system and the double-side grounding type online testing method for conducting comprehensive tests on switchgear of power transmission, transformation and distribution lines. The double-side grounding type online testing system comprises the tested switchgear and an action driver controlling the tested switchgear to switch on and switch off, and further comprises a host, a connecting cable, grounding wires and a current sensor, wherein the grounding wires connected with a wiring terminal on the same side of the tested switchgear are electrically connected with the same grounding welding pile, and the grounding welding pile is electrically connected with constant current source output ends in the host by means of theconnecting cables. The invention aims to provide the online testing system and testing method for improving the power failure test efficiency of the switchgear, optimizing the test flow and reducing the operational risk.

Description

technical field [0001] The invention relates to the technical field of power equipment testing, in particular to a double-side grounding online testing device and a testing method for performing comprehensive tests on switching equipment of transmission, transformation and distribution lines. Background technique [0002] Switchgear includes line opening and closing equipment such as circuit breakers, knife switches, switch cabinets, air circuit breakers, and low-voltage switches. It is an important equipment in power transmission, transformation, and distribution systems, and it is used in a large amount. Taking circuit breakers as an example, generally there are about 20-30 circuit breakers in a 220kV substation. According to the requirements, the power supply company should regularly test the switchgear to judge the status of the switchgear and eliminate hidden dangers in the system. The test of switchgear mainly includes mechanical characteristic test and loop circuit t...

AI Technical Summary

Problems solved by technology

There are mainly the following problems in the existing on-line switchgear power failure test: a) When the switchgear is powered off, it is necessary to hang the grounding wire on both sides of the switchgear, that is, both sides are grounded, but it is often necessary to remove the single side grounding wire when performing the power failure test , there are many processes; b) The removal of the connecting wire requires frequent lifting of the insulating rod, which is prone to fall to the adjacent live interval, resulting in electric shock accidents, and the risk is high; c) The removal of the connecting wire needs to be approved by the three departments of regulation, operation and maintenance, and management. Efficiency is not easy to improve, and the preparation period is long; d) For the power failure test of online equipment, because of its high installation position, multiple workers are often required to lift a 3 to 5-meter-long insulating pole on the ground or on the operating platform for disassembly work. , the dismantling work must comply with the regulations, one operation time is long, and the test efficiency is low; e) The test instruments and cables of different tests are different, and the wiring methods are generally different.

In many saline-alkali areas and copper ground network areas (especially at the low-voltage switch of substations), the resistance of the ground network is very small, which is only several times or dozens of times the circuit resistance of the switchgear. When the current passes, the ground network part has a large flow , this part of the current cannot be ignored. If the previous algorithm or wiring is still used, there will be a large error, which will lead to misjudgment of the equipment

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