Electrical tree inception characteristics of XLPE insulation under power-frequency voltage and superimposed impulse voltage

• Published in: 11th International Symposium on High-Voltage Engineering (ISH 99) pp. 4.320.P2 - 4.323.P2
• Main Authors: Wang, Hongxin, He, Jingliang, Zhang, Xiuge, Li, Zipin, Li, Luo, Guan, Genzhi
• Format: Conference Proceeding Journal Article
• Language: English
• Published: London IEE 1999
• Subjects: Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric breakdown and discharges; Dielectric breakdown and space-charge effects; Dielectric properties of solids and liquids; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Electrical engineering. Electrical power engineering; Exact sciences and technology; Materials; Organic insulation; Physics; Power cables; insulation testing; impulse testing; electrical tree inception characteristics; power-frequency voltage; XLPE insulation; transmission cable; power cable insulation; power cable testing; space charge effect; tree initiation tests; superimposed impulse voltage; 220 kV; impulse voltage; space charge; trees (electrical); XLPE cable insulation; pre-applied power-frequency stress; impulse inception strength; polarity; Polymer; Experimental result; Electric insulating material; Impulse; Electric discharge; Overvoltage
• ISBN: 0852967195; 9780852967195
• ISSN: 0537-9989
• DOI: 10.1049/cp:19990857

This paper deals with treeing inception voltage characteristics of XLPE cable insulation subjected to impulse voltage superimposed on power-frequency voltage. The tree initiation tests were performed on specimens removed from a section of 220 kV transmission cable. The impulse inception strength of an electrical tree was found to be dependent on the pre-applied power-frequency stress and the relative polarity of the superimposed impulse voltage. Besides, it also shows an obviously accumulative effect and tree inception delay. These phenomena are discussed in connection with the space charge effect. (4 pages)