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High-voltage storage capacitors, which have composite insulations of polypropylene film and paper impregnated with oil, are working under charge-discharge mode. The insulations are not only exposed to electrical stress but also to thermal stress. Failure factors of composite insulation in capacitors are analyzed from three aspects: partial discharge (PD), space charge, and thermal factors. In order...
Partial discharge detection under DC is an appropriate method for insulation condition estimation. This paper presented a DCPD measurement and analysis system. System, characterized by high signal to noise ratio and strong ability for interference suppression, was composed with narrowband RLC balanced detection circuit, gain-stable amplifier and band-pass filter. Through trigger acquisition, DCPD...
High voltage storage capacitors have been widely used in industry, agriculture and military fields. From the former researches, it was found breakdown always happened during large impulse discharge process. Through waveforms comparison, large impulse discharge had the similar high dv/dt to high voltage rectangular wave. The high dv/dt caused much partial discharge and space charge effect to insulation...
As for storage capacitor charged under DC and discharges with a large pulse, partial discharge detection under DC is fit for its work condition. The paper presents the principle and construction of a detecting instrument for DC partial discharge (PD) within storage capacitor as well as the results of the first stage experiments. In order to increase the sensitivity of measurement system for large...
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