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| Measurement and Analysis for Pulse Sequence of Partial Discharge Signals Under DC Voltage |
| Si Wenrong, Li Junhao, Yuan Peng, Guo Hong, Luo Yongfen, Li Yanming |
| Xi’an Jiaotong University Xi’an 710049 China |
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Abstract A time recovery and lag model with its hypothesis to analysis partial discharge (PD) pulse sequence signals under DC voltage is introduced in this paper. A group of histograms to analysis DC PD are deduced from the two basic parameters, the discharge magnitude and arrive time which can be recorded by the PD measurement system. Three basic defect models of oil-paper insulation including corona, bounded cavity and surface discharge, and a typical discharge model of corona in air are described after the DC PD test and measurement system are shown. The PD measurement system has a special anti-noise technique which resorts to the characteristic of pulse waveshape signals in time and frequency domain to achieve fast separation of random pulsed noise signals. Test results of those defect models are analyzed and discussed respectively, which show that PD pulse sequence under DC voltage has its own characteristic with different defect models. Some of analyze results can be explained well with the time recovery and lag model with its hypothesis. This provides a test and theoretical evidence for study of detection and identification of PD pulse sequence under DC voltage.
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Received: 01 July 2008
Published: 04 March 2014
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2010, Vol. 25 
