Recovery voltage response of XLPE cables based on polarisation and depolarisation current measurements. Issue 24 (14th November 2019)

• Record Type: Journal Article
• Authors: Morsalin, Sayidul; Sahoo, Animesh; Phung, Bao Toan
• Is Part Of: IET generation, transmission & distribution. Volume 13:Issue 24(2019)
• Page Start: 5533
• Page End: 5540
• Publication Date: 2019-11-14
• Subjects: voltage measurement -- power cable insulation -- equivalent circuits -- electric current measurement -- XLPE insulation -- mathematical analysis; XLPE cables -- depolarisation current measurements -- recovery voltage measurement -- common diagnostic techniques -- condition assessment -- electrical insulation -- dielectric response -- polymeric insulation -- mathematical model -- RVM measurement -- Debye equivalent circuit -- depolarisation currents -- r‐C relaxation branches -- depolymerisation -- PDC -- polarisation and depolarisation currents -- cross‐linked polyethylene insulated cable -- Bode plots -- voltage 11 kV; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2019.1004
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : Recovery voltage measurement (RVM) is one of the common diagnostic techniques for the condition assessment of electrical insulation. The method has been used to examine the dielectric response, especially deterioration or depolymerisation of the polymeric insulation under ageing condition. In this study, a mathematical model of the RVM measurement based on the Debye equivalent circuit is elucidated. The methodology for determining the modelling parameters from the polarisation and depolarisation currents (PDCs) is described. For the experiments, two short‐sections of service‐aged 11‐kV cross‐linked polyethylene insulated (XLPE) cable are used, and the PDC of these test specimens are measured. Here, the model adapted comprises three R‐C relaxation branches, where each branch represents a polarisation type. From the derived model, the peak of the RV can be predicted and are constructed over a wide range of charging time. Bode plots of the test objects are also presented with the magnitude and phase response which assist in understanding the RVM response.