Understanding condition is the key to better transformer management

EA Technology has produced a new podcast explaining the latest testing techniques available to maximise the performance of MV and HV transformers, and reduce costs.


View it online at www.eapodcasts.co.uk

The five minute film takes a ‘whole life’ view of transformer management, from acceptance trials and witnessing with suppliers, through condition tests in service, to forensic investigations into why assets have failed.


EA Technology director Tony Hill explained: “New testing and asset management techniques are extremely valuable to help operators decide when to maintain, repair or replace their transformers.”


The film gives an overview of the testing techniques used for routine maintenance as well as advanced diagnostics, including sweep frequency response analysis, which provides a benchmark of a transformer’s condition so that changes can be monitored over time. It also explains the value of tan delta tests, which provide a detailed analysis of tap changer continuity and the condition of windings, bushing and insulation.


In addition to providing information on individual transformers, test data can be used to develop Health Indices for whole fleets of transformers. This is the basis of new Condition Based Risk Management (CBRM) strategies, where assessment of asset condition becomes the core driver for all investment decisions on maintenance and replacement.


The film also examines the value of thermal modelling as a technique for safely extending the power that can be handled by specific transformers, without affecting their reliability.


Mr Hill added: “Understanding the condition of transformers is one of the keys to better asset management, because it results in greater network reliability, less downtime, improved performance, lower maintenance costs and more intelligent replacement strategies.”