Anomalies in On-Load Tap Changers: failure prevention through continuous monitoring and advanced data analysis techniques

Loading...
Thumbnail Image
Paper number
1931
Working Group Number
Conference name
CIRED 2019
Conference date
3-6 June 2019
Conference location
Madrid, Spain
Peer-reviewed
Yes
Short title
Convener
Authors
Tozzi, Marco, Camlin Power Ltd, United Kingdom
Cox, Steve , Electricity North West, United Kingdom
Chiesi, Lorenzo , Camlin Technologies, Italy
Mudryk, Anatoliy, Camlin Power Ltd, United Kingdom
Abstract
One of the leading causes of power transformer failures is the fault of the On-Load Tap Changer (OLTC) mechanism, mainly due to issues of dielectric, thermal or mechanical nature. Offline tests can assess the tap changer condition, in particular the Dynamic Resistance Measurements and DGA, but the results can be difficult to interpret, requiring expert analysis, in addition to the need for taking the transformer out of service.Electricity North West (ENW) has run an Innovation project to maximize the use of existing assets. In particular, ENW has identified that there is a need for improving the management of repair, maintenance and replacement of OLTC in the distribution transformers.Beside the conventional offline-tests it was decided to explore the capabilities of continuous on-line monitoring devices to find out leading indicators to properly plan maintenance and avoid catastrophic and dangerous failures. A project has started consisting of installing 42 permanent monitoring system collecting, continuously, parameters such as motor current, temperatures, transformer load, tap position and vibro-acoustic signature.The raw data have been collected for months and analysed by both data scientists and transformer experts. The paper describes the results of the first data analysis, which show a potential in providing automated algorithms able to correlate a multitude of parameters, set automatically alarm thresholds and detect anomalies that need further investigation.
Table of content
Keywords
Publisher
AIM
Date
2019-06-03
Permanent link to this record
https://cired-repository.org/handle/20.500.12455/653
http://dx.doi.org/10.34890/876
ISSN
2032-9644
ISBN
978-2-9602415-0-1