NDLI: Washing withstand voltage tests on station insulators

Content Provider	IEEE Xplore Digital Library
Author	Sharp, R. Yokoi, S. Akizuki, M. Burnham, J.
Copyright Year	2001
Description	Author affiliation: Pacific Gas & Electr. Co., San Francisco, CA, USA (Sharp, R.)
Abstract	An investigation was undertaken to determine the cause of flashovers on semi-conducting glaze (also called resistive glaze) station post insulators produced by two different manufacturers, that were experienced by Pacific Gas and Electric Company (PG&E) during pressure washing in the Moss Landing Substation. The insulators that flashed were being struck by over spray water caused during washing of adjacent insulators. Comparative tests were performed at NGK's High Voltage Laboratory in Komaki, Japan with semi-conducting glaze station posts, ordinary glaze station posts, and pin type insulators energized at 70 kV (phase to ground) under different conditions of wetting and artificial contamination. The tests confirmed that semi-conducting glaze insulators had excellent performance while contaminated and in heavy clean mist, or while clean but subjected to heavy salt mist. However, when an extreme volume of water from overspray cascaded across the sheds of contaminated semi-conducting insulators they could flash as the mechanisms that give semi-conducting glaze insulator their excellent performance are defeated. Under these conditions the washing withstand voltage of ordinary and semiconducting glaze insulators is the same. Two countermeasures, modifying the wash pattern and reducing the volume of water by using a nozzle with a small orifice diameter, were found to be effective in reducing flashover probability when washing insulators in a substation.
Starting Page	765
Ending Page	770
File Size	249912
Page Count	6
File Format	PDF
ISBN	0780372859
DOI	10.1109/TDC.2001.971334
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-11-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage Insulator testing Glazes Water pollution Flashover Substations Dielectrics and electrical insulation Gas insulation Manufacturing Spraying
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in