Premium
A study on hybrid insulation composition joint using gas and solid insulator for gas‐insulated power equipment
Author(s) -
Shinkai Hiroyuki,
Goshima Hisashi,
Yashima Masafumi
Publication year - 2011
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/eej.21107
Subject(s) - insulator (electricity) , switchgear , materials science , conductor , gas composition , cable gland , sulfur hexafluoride , voltage , electrical engineering , electrode , composite material , circuit breaker , mechanical engineering , engineering , chemistry , physics , thermodynamics , organic chemistry
SF 6 is used as the main insulation gas for gas‐insulated switchgear (GIS), but it has recently become a gas that must be restricted because of its greenhouse effects. To date, we have studied the insulation characteristics of compressed N 2 and CO 2 as possible alternatives for SF 6 . We have reported that N 2 or CO 2 must be pressurized to 2.0 MPa when it is used as a substitute for SF 6 at 0.5 MPa. Therefore, we have proposed a hybrid installation composition that uses gas and solid insulators. Because the central conductor of GIS is covered by a solid insulator in this composition, a high‐pressure gas at 2.0 MPa is not needed. However, the joint of the solid insulator becomes a weak point for discharge development. In this paper, we describe an effective configuration for improvement of the withstand voltage based on experiments. The most effective connector was made of resin without an implant electrode and the most effective configuration was one without a solid–solid interface between the solid insulator of the central conductor and the resin connector. In this experiment, the improvement of breakdown electric field of the hybrid composition was 44% or more compared with the case of only gas insulation (conventional method). In addition, further improvement can be expected by optimizing the insulation creepage distance and configuration. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 178(1): 11–20, 2012; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21107