Abstract
Fault diagnosis via partial discharge (PD) detection can timely identify and remove the deteriorating insulation, enhancing the persistence and resilience of power apparatuses. Visual and ultrasonic-based inspection method is a common manner to seek PD-affected power equipment in overhead distribution lines. However, the approach suffers from two deficiencies, inefficiency for widely distributed apparatuses or lines and ineffectiveness for internal PDs. An alternative solution is to use the travelling wave (TW)-based PD detection method, which can detect and locate PD in a remote distance. However, inconvenient installation and security problems of the conventional TW detectors impede their further application. Aimed at the limitations, the paper develops an improved TW-based PD detector for overhead distribution lines. Non-invasive and safe PD detection is achieved by a fiber optic transmission-enhanced Rogowski coils. Calibration of the PD detector is achieved via vector fitting technique and signal reconstruction. Finally, an on-site testing was carried out on a 5550-m PD-affected 10- kV overhead line and the result reveals that PD localization relying on the developed PD detectors can significantly improve the efficiency of PD measurement of overhead distribution lines.
Published Version
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