Abstract
Identification of insulation defects in gas insulated metal-enclosed switchgear (GIS) is important for partial discharge (PD) evaluation. This article proposes a polar coordinate pattern approach to characterize the different kinds of defect types. These defect types include floating electrodes, a fixed protrusion on the enclosure, surface contamination on the spacer, metallic prominence on the high voltage electrode, a void in the insulator, and free metal particles on the enclosure. First, the physical models for the insulation defects in the established GIS model are designed. Second, the phase resolved pulse sequence (PRPS) data sets are obtained using ultra-high frequency (UHF) measurement. Then, the polar coordinate patterns are proposed to characterize the defects. Nine discharge parameters combined with the parameters based on quadrant statistical theory constitute the input feature vector to identify the PD types. The experimental results show that these new parameters could produce a clear, quantitative description of the characteristics of the defect types and could be used to distinguish between the different kinds of defect types.
Highlights
In high-voltage power systems, gas insulated metal-enclosed switchgear (GIS) is widely used.Electrical insulation is an important problem in all high voltage power equipment; insulation fault detection is necessary
Combined with the parameters based on quadrant statistical theory, these parameters constituted the input feature vector to identify partial discharge (PD) types
In the polar coordinate pattern, the horizontal axis in the phase resolved partial discharge (PRPD) pattern is in a head to tail arrangement, so the observation of the partial discharge phase characteristics can be more intuitive
Summary
In high-voltage power systems, gas insulated metal-enclosed switchgear (GIS) is widely used. Electrical insulation is an important problem in all high voltage power equipment; insulation fault detection is necessary. If an insulation fault existing inside GIS is not detected, it may cause insulation faults in the GIS. If any insulation fault exists inside GIS [1], the intensity of the electric field around the insulation fault increases locally. In this case, it will cause partial discharge (PD). This paper, through experiments in the GIS test cavity, applies the UHF method to monitor the PD of the six types of defects in GIS. Six types of insulation defects are identified by the parameters extracted from the polar coordinate pattern
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