Research on the discharge characteristics of XLPE insulated DC cables
Source abstract
Abstract
This paper focuses on the discharge of cross-linked polyethylene (XLPE) insulated DC cables, which has become a concern of power utilities when carrying out a voltage withstand test or an outage maintenance. Based on the electrical tree initiation test of XLPE block samples under grounded DC voltages, the main cause and key factors for damages of DC insulation resulted by grounding discharge were investigated, and the allowable voltage level to start the accelerated discharge operation was estimated. By the laboratory tests of two XLPE cable samples discharged under different conditions, the basic discharge rules were observed, the equivalent circuit was set up, and the equipment parameters were determined. In addition, a method to estimate the discharge time for cable lines with different lengths was proposed. Finally, the on-site measured data of decay voltage and leakage current were presented for a 200 kV DC XLPE cable line which had been discharged steppedly through a resistance grounding device after the DC voltage withstand test, and the experimental results were found to be in good agreement with the theoretical data.
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Research context
OpenAlex topics: High voltage insulation and dielectric phenomena · Lightning and Electromagnetic Phenomena · Electrical Fault Detection and Protection
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Electrical Engineering, Xi’an Jiaotong University 1 , Xi’an 710049, China
Zhoushan Power Supply Company, State Grid Corporation 2 , Zhoushan 316021, China
Funding
National Natural Science Foundation of China · National Key Research and Development Program of China
References (19)
Show source-provided references
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