access icon openaccess Investigation of sensitivity of the ultra-high frequency partial-discharge detection technology for micro-crack in epoxy insulator in GIS

This is an open access article published by the IET and CEPRI under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 17/09/2019, Accepted 27/04/2020, Revised 17/03/2020, Published 27/04/2020

The ultra-high frequency (UHF) method has been widely used in a gas-insulated system (GIS) for partial-discharge detection, and many achievements have been realised. In addition, many studies based on artificial defects have been made to confirm its validity. Therefore, the UHF method is generally believed to be sufficiently effective for GIS monitoring. However, in practical application, the authors find that for some micro-crack discharge in GIS insulator, the UHF method has low sensitivity. To fully study the characteristics of the micro-crack discharge in the GIS insulator, an experiment is conducted in this study using an actual post insulator with a micro-crack defect. The current signal based on IEC 60270 standard and the radio-frequency electromagnetic signal is simultaneously measured for thorough analysis. The results show that some submillimetre crack defects may occur in the GIS insulator. Its discharge is mainly presented as glow discharge, and the discharge signal frequency usually cannot reach the UHF band; thus, it cannot be effectively detected by the UHF method. This study provides complementary information to the applicability of the UHF method and inspires further study of the GIS insulator and its monitoring technology.

Inspec keywords: IEC standards; partial discharge measurement; gas insulated switchgear; glow discharges; microcracks; epoxy insulators

Other keywords: GIS insulator; submillimetre crack defects; ultrahigh frequency partial-discharge detection technology; discharge signal frequency; gas-insulated system; GIS monitoring; glow discharge; microcrack defect; radiofrequency electromagnetic signal; IEC 60270 standard; epoxy insulator; UHF method; microcrack discharge; actual post insulator

Subjects: Switchgear; Charge measurement; Power line supports, insulators and connectors; Dielectric breakdown and discharges

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