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Decrease in ac surface partial discharges on an insulator with backing electrode by use of a hollow electrode
Author(s) -
Tsurumizu Tatsuya,
Yamano Yoshiaki
Publication year - 1997
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/(sici)1520-6416(19971130)121:3<1::aid-eej1>3.0.co;2-8
Subject(s) - electrode , insulator (electricity) , materials science , electric field , voltage , composite material , optoelectronics , electrical engineering , chemistry , physics , quantum mechanics , engineering
Alternating‐current surface partial discharges (PDs) in air from the triple junction (TJ) of a cylindrical insulator with a backing electrode were decreased by use of a hollow electrode. The voltage applied was varied over a range from 1 to 1.5 times the PD initiation voltage (Vpd). The thickness of the insulator was varied over a range from 2 mm to 7.5 mm. For applied voltages of 1.2 × (Vpd) and 7.5 mm thickness, the combined magnitude of the PD pulses for the hollow electrode was about 80% smaller than that for the nonhollow electrode; the total number of pulse events was 40% to 50% smaller than for the nonhollow electrode; and PD pulses stronger than approximately 7 × 10 −11 C were suppressed significantly. Calculation of the electric field around the TJ suggested that the generation and propagation of the PD pulse resulted from an increase in potential and strength of the vertical field component on the surface of the insulator near the TJ. It was observed from powder figures that the propagation of PDs on the hollow insulator kept their length about 50% shorter than on the nonhollow insulator. © 1998 Scripta Technica, Inc. Electr Eng Jpn, 121(3): 1–8, 1997