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Partial discharge (PD) level under the specified AC/DC test voltages, which is one key parameter indicating the insulation reliability of ultra-high voltage direct current (UHVDC) converter transformers, do not often be accurately determined due to the impact of the external electromagnetic interference. To solve this problem, a method that uses the ultra-high frequency (UHF) technology to monitor...
In order to compare the sensitivity between the UHF and ultrasonic methods for partial discharge detecting in GIS, a 252kV GIS experimental platform was established. Four typical defect models are taken into consideration, including metal particle stuck on the insulator surface; free metal particle on the insulator surface; ground electrode defect and poor contact of high voltage electrode. Through...
The widespread application of SF6 gas insulated substations (GIS) in high voltage power transmission requires reliable fault detection and diagnosis techniques. Partial discharge (PD) detection has so far been proven to be the most effective tool for GIS insulation diagnosis. Both ultra high frequency (UHF) technique and acoustic means have been popularly used in PD detection thanks to their well-noted...
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