NDLI: An Attempt to Investigate the Transformer Failure by using DGA and SFRA Analysis

Content Provider	IEEE Xplore Digital Library
Author	Patil, S.S. Chaudhari, S.E.
Copyright Year	2012
Description	Author affiliation: High Voltage Product Technology Centre, Global R&D centre, Crompton Greaves Limited, Mumbai, India (Patil, S.S.; Chaudhari, S.E.)
Abstract	A sudden increasing power demand leads to manufacture of large number of oil immersed power transformers and other electrical power equipments. Power transformers are the most vital equipment in power system. Any failure in transformer leads to malfunction of whole power system. Unfortunately, the failure rate of these transformers is very high in India, 25% per annum, which is not favorable as compared to international units of 1–2 %. Failures happen due to internal reasons or operational hazardless. Transformer insulation deteriorates as the function of temperature, moisture and time. The core and winding losses, stray losses in tank and metal support structures are the principle sources of heat which cause oil and winding temperature rise. There are multiple reasons for overheating such as improper cooling, excessive eddy currents, bad joints, blocked radiators, overloading, improper earthing and harmonic contents in power supply. This leads to accelerated aging of oil and cellulosic solid insulation, which generate the gases within transformer and further leads to permanent failure. To prevent such failures, effective analysis and diagnosis needs to be investigated. The type of gases generated and amount of gas concentrations in oil efficiently evaluated using Dissolved Gas analysis (DGA). Various other electrical diagnostic tests like winding resistance test, short circuit impedance, oil analysis and sweep frequency response analysis (SFRA) are also helpful for identification of abnormalities and probable fault area. SFRA technique is widely accepted and used for transformer mechanical condition assessment. Based on the type and concentration of gases generated in oil along with application of SFRA test on transformer can help to identify the abnormal areas prior to catastrophic failure. An attempt has made for the investigation on relation of DGA with SFRA response. Case studies are presented here for the transformers which have higher fault gas concentrations (DGA). Additional diagnostic tests and analysis, inspection and history data has found supportive in investigation.
Starting Page	1
Ending Page	4
File Size	1017379
Page Count	4
File Format	PDF
ISBN	9781467328524
ISSN	21609241
e-ISBN	9781467328517
DOI	10.1109/ICPADM.2012.6318985
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-24
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Monitoring Resonant frequency Minerals Windings Electric breakdown Failure Analysis Power transformer Insulation Deterioration Overheating DGA SFRA Resonance shift
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
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Frequency response measurement of a power transformer

Location of faults in transformer winding using SFRA

Power transformer health monitoring: A shift from off-line to on-line detection

Insight into SFRA responses & interpretations with regard to insulation system of transformer

Minimum detection of power transformer short circuit fault using frequency response analysis

Impact of insulating oil degradation on the power transformer frequency response analysis

Identification and location of breakdown in windings

Internal overvoltages in cast resin transformer windings in presence of resonance effects

Hydrocarbon gases dissolved in palm-based insulation oil after experienced breakdown

An Attempt to Investigate the Transformer Failure by using DGA and SFRA Analysis

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