Partial discharge charged detection comprehensive diagnosis method of GIS (Gas Insulated Switchgear) for electric power

Abstract

The invention relates to a partial discharge charged detection comprehensive diagnosis method of GIS (Gas Insulated Switchgear) for electric power, which comprises the following steps of: quickly surveying whether the insulation performance of the running GIS is normal or not by adopting a transient voltage-to-ground test method and in combination with a high-frequency CT (Computed Tomography) matched with a high-speed oscilloscope background noise test method; accurately measuring the abnormal GIS through a ultra-high frequency sensor matched with a high-speed oscilloscope or a portable frequency spectrometer to confirm whether a partial discharge signal of the running equipment exists; diagnosing the discharge part and the discharge defect type of the running equipment by applying an ultrasound partial discharge and ultra-high frequency partial discharge test method; and further confirming the discharge defect of the running equipment by adopting a SF6 decomposition product analysis method for a suspected defect gas chamber and adopting an X-ray perspective irradiation method for a suspected defect part. The partial discharge charged detection comprehensive diagnosis method of the GIS has the advantages of various means, highly-efficient test, definite diagnosis and the like.

Description

technical field [0001] The invention belongs to the technical field of insulation partial discharge diagnosis of electrical equipment, and is especially suitable for live detection of partial discharge of GIS equipment. Background technique [0002] With the development of power grid construction, due to the limitation of site conditions, geological conditions and environmental conditions in the construction of substations, there are more and more cases of using GIS equipment. for GIS equipment, or most SF 6 As far as gas-insulated equipment is concerned, its insulation defect is the main cause of equipment failure, and according to statistics, it accounts for more than 60%. How to detect and judge the insulation performance of GIS equipment, including HGIS, GIL, and even tank circuit breakers of GIS-like equipment, has always been a difficult and important point. [0003] The research and application of partial discharge diagnosis technology for electrical equipment has b...

AI Technical Summary

Problems solved by technology

Due to the influence of environmental interference information, different types of detection methods have certain limitations, but relatively speaking, the mixed application of transient ground voltage method and high-speed oscilloscope background noise direct measurement method is a convenient and effective inspection method. Correspondingly, the spectrum analysis method and the high-speed oscilloscope discharge signal direct detection method are more effective for confirming the presence or absence of the discharge signal, but the effect is slightly cumbersome; while the more mature ultrasonic partial discharge and ultra-high frequency partial discharge It is more effective to implement the discharge test method to realize the diagnosis of the discharge part and discharge defect type of the operating equipment, but it is not the most suitable as a patrol inspection method in terms of cost-effectiveness ratio and personnel quality requirements; when confirming After identifying the discharge site, SF can be further used 6 Decomposition analysis method and X-ray fluoroscopy irradiation method are used to assist in the charging confirmation of discharge information, so as to effectively ensure the meticulousness and credibility of the entire detection plan

Images