A study on hybrid insulation composition joint using gas and solid insulator for gas-insulated power equipment

SF6 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 N2 and CO2 as possible alternatives for SF6. We have reported t...

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Bibliographic Details
Published in:Electrical engineering in Japan 2012-01, Vol.178 (1), p.11-20
Main Authors: Shinkai, Hiroyuki, Goshima, Hisashi, Yashima, Masafumi
Format: Article
Language:English
Subjects:
Carbon dioxide
Conductors (devices)
Connectors
gas-insulated power equipment
hybrid insulation composition
Insulation
Insulators
On-line systems
Polymers
Resins
SF6 alternative gas
SF6 gas quantity consumed reduction
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Summary:SF6 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 N2 and CO2 as possible alternatives for SF6. We have reported that N2 or CO2 must be pressurized to 2.0 MPa when it is used as a substitute for SF6 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
ISSN:0424-7760
1520-6416
1520-6416
DOI:10.1002/eej.21107