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V-t characteristics of partial discharge inception in liquid nitrogen/ PPLP® composite insulation system for HTS cable

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5 Author(s)
H. Okubo ; Dept. of Electr. Eng., Nagoya Univ., Japan ; M. Hazeyama ; N. Hayakawa ; S. Honjo
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In this paper, we studied partial discharge (PD) inception characteristics and V-t characteristics of PD inception in liquid nitrogen (LN2)/polypropylene laminated paper (PPLP®) composite insulation system for high temperature superconducting (HTS) cable. Experimental results revealed that the magnitude of initial PD was in the range of 2.0-30 pC irrespective of butt gap condition and the initial PD was generated at the first and third quadrant of voltage phase. PD inception electric field strength (PDIE) without butt gap was 5-10% higher than that with butt gap and thicker butt gap gave larger PDIE drop. Moreover, PDIE with butt gap depended on the butt gap thickness and the number of PPLP® layers. The reason is explained by the existing probability of weak points of electrical insulation at butt gap. Finally, lifetime indices n of V-t characteristics at PD inception were obtained as 80-100 irrespective of butt gap condition. These values showed enough flat characteristics of V-t phenomena of electrical insulation.

Published in:

IEEE Transactions on Dielectrics and Electrical Insulation  (Volume:9 ,  Issue: 6 )