Conventional and Un-Conventional Partial Discharge Detection Methods in High Voltage XLPE Cable Accessories
Partial discharge (PD) measurement methods are most important and preferred in testing of underground high voltage cables and they have received much attention in recent years. Apparent charge, partial discharge inception voltage as well as number and distribution of PD pulses are most important quantities for the determination of the insulation quality. Identification with certain PD patterns and localization of PD are most important aspects. Different ways to suppress external noise is applied to detect signals with high sensitivity also in difficult on-site conditions. Partial discharge detection method can be classified into two techniques, conventional and un-conventional. Conventional PD detection is a standardized method for PD measurement as described in IEC 60270. This method based on measurement of apparent charge displacement q in the leads of the sample. This charge is usually expressed in pico-Coulombs (pC). Un-conventional PD measurement is based on detection of high frequency PD activities. In this paper an overview covering best practices for PD measuring using conventional and un-conventional methods is presented and predictive diagnostic programs to cable system is applied. It contains also the results of many measurements carried out on XLPE cable system.
Partial Discharge-High voltage cables- Conventional and un-conventional- Cross bonding links-High frequency current transformers.
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