ANALYSIS AND DE-NOISING OF PARTIAL DISCHARGE SIGNALS IN MEDIUM VOLTAGE XLPE CABLES

  • سال انتشار: 1396
  • محل انتشار: کنفرانس بین المللی افق های نو در علوم مهندسی
  • کد COI اختصاصی: ENGCONF01_051
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 668
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نویسندگان

ahmad moradi

Student of Islamic azad university south Tehran branch

mohammad mortazi

Student of Islamic azad university south Tehran branch

alireza nadi polkhabi

Sudent of Islamic azad university of karaj

چکیده

The partial discharge (PD) measurements have been widely used in the field of insulation diagnostics . The presence of partial discharges inside the cable indicates the degradation of insulation material . This paper deals with the development of insulation diagnostic method based on the partial discharge measurements . The useful information about the partial discharge activity and insulation defects is extracted by the experimental results . A measuring test setup was established in the high voltage laboratory . Artificial cavity was introduced inside the MV XLPE cable by using the traditional needleplane configuration . The aim of study was to interpret the variations in the partial discharge characteristics over the insulation ageing period in terms of physical phenomenon’s taking place in PD sources . The statistical characteristics formulated with the help of PRPDA technique and characteristics by using HFCT sensor were studied and analyzed . The variations in these characteristics allow to diagnose the insulation conditions as well as detect the type of discharge mechanisms . In order to design an efficient de-noising filter for onsite and online PD monitoring system . various factors such as optimal wavelet selection, number of decomposition levels and threshold setting has been studied . An automated de-noising based on the frequency characteristics of partial discharge signals has been presented in this study .

کلیدواژه ها

Partial Discharge characteristics, XLPE insulated cables, insulation degradation, monitoring, PRPDA

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