SF6 gas-insulated metal-enclosed complete alternating-current voltage-withstanding and partial-discharge test device

Abstract

The invention discloses an SF6 gas-insulated metal-enclosed complete alternating-current voltage-withstanding and partial-discharge test device. The device comprises a reactor tank, a transition tank, a right-angle tank, a capacitor tank and a three-way butt joint tank; the electric reactor tank, the transition tank, the three-way butt joint tank, the right-angle tank and the capacitor tank are sequentially isolated by basin-type insulators, and each tank is filled with SF6 gas as an insulating medium. According to the complete test device, SF6 gas is used for insulation, the device is light in weight and small in size, the limitation of lifting tools, placing places and the like in a GIS hall of an underground powerhouse can be effectively solved, meanwhile, a high-voltage loop adopts a totally-closed tank structure, other external electromagnetic interference and pulse signals in a plant station can be effectively shielded, a coupling capacitor for partial discharge test is arranged, the partial discharge test can be carried out by adopting the principle of a pulse current method, and the partial discharge test device has obvious advantages on partial discharge analysis in an insulation verification test after GIS handover test or GIS maintenance.

Description

technical field [0001] The invention relates to the technical field of electrical equipment insulation detection, and specifically provides an SF6 gas-insulated metal-enclosed complete set of AC withstand voltage and partial discharge test device for GIS. Background technique [0002] GIS (Gas insulated swichgear) is a metal-enclosed switchgear that uses SF6 as the insulation and arc-extinguishing medium. It seals circuit breakers, disconnectors, grounding switches, current transformers, voltage transformers, busbars and other components inside the metal cavity. The fully enclosed design of GIS makes it less affected by the environment, and its operation is safe and reliable. Compared with the open air insulated switchgear AIS (Air insulated switchgear), it occupies a much smaller area and is favored by the power system. In order to check whether there are various hidden dangers leading to internal failures (including packaging, transportation, storage, installation and comm...

AI Technical Summary

Problems solved by technology

However, this kind of equipment structure has the following problems: ① Air is used as the insulating medium, and the required insulation distance and insulation margin are relatively high; ② The high voltage during the test has a greater impact on the surrounding equipment; ③ It is significantly affected by the environment; ④ This type of The interior of the equipment adopts solid insulation, the equipment is heavy and large in size, and there are problems such as inconvenient transportation and difficult hoisting; ⑤Partial discharge test can only be tested by UHF partial discharge test or ultrasonic partial discharge test method, and pulse current method cannot be used for testing Effective testing, the validity and analyzability of the test results are poor; ⑥The distribution of the electric field in the test circuit is uneven, and it is easily affected by the electromagnetic interference of the environment, resulting in a large background noise during the partial discharge test

The above six problems lead to some specific GIS installation environments, such as underground plant structures of pumped storage power stations, urban underground GIS halls, etc., it is difficult to carry out GIS AC withstand voltage test with traditional open AC withstand voltage test equipment, and partial discharge test is basically unable to carry out

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