Journal
IEEE TRANSACTIONS ON POWER DELIVERY
Volume 36, Issue 5, Pages 3266-3269Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRD.2021.3089030
Keywords
Partial discharge; MV switchgears; transient earth voltage; location; modularization
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Funding
- Shaanxi Electric Power Research Institute of State Grid in China [PESL-00077-2021]
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This paper presents a PD monitoring and locating system for medium-voltage switchgears using transient earth voltage (TEV) detectors. The system utilizes a time-of-flight methodology to identify the switchgear affected by PD among a row of switchgears, and implements a time sharing access mechanism to automatically identify the site of PD. Experimental results confirm the efficiency of the system in identifying switchgear with PD among three 10 kV metal-clad switchgears.
Identifying the location of partial discharges (PDs) and providing clear information on insulation vulnerabilities in power systems can help utility companies to improve their maintenance efficiency. This paper presents a PD monitoring and locating system for medium-voltage switchgears using a set of transient earth voltage (TEV) detectors. A time-of-flight methodology was used to identify the switchgear affected by PD among a row of switchgears. A time sharing access mechanism, which was implemented by multiple high-frequency surface mounting relays integrated into each TEV detector, was applied to automatically identify the site of PD and minimize the number of expensive high-speed acquisition cards. The operation principle and implementation of the modular system were formulated, and the efficiency of the proposed system in identifying the switchgear with PD among three 10 kV metal-clad switchgears was confirmed experimentally.
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