NDLI: Research on the process of the transformer winding inter-turn discharge caused by corrosive sulphur

Content Provider	IEEE Xplore Digital Library
Author	Ming Chen Yangchun Cheng Chun Deng Shaoyu Liu Changjin Diao
Copyright Year	2011
Description	Author affiliation: State Key Lab. of Alternate Electr. Power Syst. with Renewable Energy Sources, EMC North China Electr. Power Univ., Beijing, China (Ming Chen; Yangchun Cheng; Changjin Diao) \|\| North China Electr. Power Res. Inst. Co..Ltd., China (Chun Deng; Shaoyu Liu)
Abstract	Corrosive sulphur has been identified to cause unexpected failure in electric power transformer in recent years. In this paper, The winding samples were aged in 25# Kunlun transformer oil with sulphur powder to form sulphur corrosion. Then their partial discharge inception voltage and partial discharge developing process were researched by high voltage experiments. Tens samples were aged for 14, 24 and 30 days in oven of 130 ć with sulphur concentration of 0.3mg/g. Fourier infrared spectral analysis was done to confirm the cuprous sulfide has deposited on the surface of the insulation paper. Tearing strength of the paper bands of the windings was measured to analyze the influence of the corrosion to the paper. In order to research the influence of the sulphur corrosion to the dielectric characteristic of the windings, the partial discharge inception voltage and the developing process of the partial discharge were measured under step raising high voltage. The results show that the sulphur corrosion reduces the tearing strength and the partial discharge inception voltage so that the corroded transformers have more risk to partial discharge and short circuit failures. The PDs of the windings has a developing process. The average magnitude, maximum magnitude and PD numbers increase with high voltage or time obeyed an exponent rule, but the pattern of the phase distribution point graph of the PDs has almost no change. According to the increasing speed, the developing process has three stages. At the first stage, the PD phenomena were stable for very long time, the PD number and PD magnitude had not obvious increase. At the second stage, the PD number and PD magnitude suddenly increased with exponent rules. At the third stage, there were more and more very big PD pulses. The PDs can be divided into small ones and big ones. These research are valuable for the life evaluation and condition monitoring of large electrical power transformers.
Sponsorship	DEI
Starting Page	476
Ending Page	479
File Size	1197263
Page Count	4
File Format	PDF
ISBN	9781457709852
ISSN	00849162
e-ISBN	9781457709869
DOI	10.1109/CEIDP.2011.6232698
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-10-16
Publisher Place	Mexico
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Partial discharges Aging Windings Power transformer insulation Oil insulation Copper
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