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Insulation recovery characteristics of 500 kV class dc insulator assemblies after arc extinction
Author(s) -
Sunabe KinYa,
Goda Yutaka,
Tanaka SinIchi
Publication year - 1999
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(19991130)129:3<29::aid-eej4>3.0.co;2-4
Subject(s) - insulator (electricity) , materials science , impulse (physics) , composite material , arc (geometry) , electrical engineering , voltage , electric arc , arc flash , electrode , chemistry , physics , engineering , mechanical engineering , quantum mechanics
The insulation recovery characteristics of 500‐kV‐class dc insulator assemblies were measured. Switching impulse voltage was applied to a tension insulator assembly and three kinds of suspension insulator assemblies (V‐, Y‐, and I‐arranged) following arc extinction. Arc current ranged from 400 A to 4000 A and arc duration from 0.1 s to 0.4 s. (1) All insulator assemblies show slow insulation recovery after arc extinction up to an impulse withstand voltage of 100 to 200 kV. The insulation recovery rates increase near the impulse withstand voltage of 500 kV. (2) At arc current of 400 to 4000 A, for a duration of 0.1 s, the recovery rate for all insulator assemblies decreases with increases in arc current. This is believed to be due to the increases in the postarc gas temperature caused by the increased arc current. (3) When the arc duration is increased from 0.1 s to 0.2 s at a current of 4000 A, the insulation recovery of the V‐ and Y‐arranged assemblies is delayed by 0.05 s. This is believed to be due to the increases in the temperature of postarc gas caused by the longer arc duration. (4) By measuring the insulation recovery characteristics of the tension insulator assembly and three kinds of suspension insulator assemblies with an arc current of 4000 A and an arc duration of 0.1 s, the minimum value of nonvoltage time for a 500‐kV dc transmission line is calculated to be 0.17 s. © 1999 Scripta Technica, Electr Eng Jpn, 129(3): 29–39, 1999