Case studies are an important part of testing and investigating issues pertaining to transformer health and failure. The following case studies are applied to the LEDT model and other generally accepted methods. The purpose of these case studies is to assess the LEDT model. Click on the links below to go to the specific case studies.
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Background [2] On the 15 May 2005 this 390 MVA GSU transformer failed. During the previous unit outage the transformer oil was purif... -
INTRODUCTION A major challenge to transformer engineers of power utilities and major industries is the management of an ageing transform... -
The Rogers Ratio method is another ratio method very similar to the Dornenburg method however only having the three ratios R1 :CH 4 /H 2 ... -
Different gases/parameters have different solubility levels in mineral oil [DiGiorgio1]. It is important to correctly identify the level... -
Power transformers are generally designed for an operating life of 30 to 35 years. However, depending on how the transformer is operated,... -
The correct design and operation of the cooling system of a power transformer is very important to maintain the health of the transformer. ... -
The following report highlights the problem of the production of combustible gases in the selector of the tap changer of gen/motor transfo... -
The Duval Triangle Method makes use of the three combustible gases CH 4 , C 2 H 4 and C 2 H 2 that are transformed for representation i... -
Background: After running under elevated gas levels the transformer was taken out of service for an on-site internal inspection on 9 M... -
Background: A 700 MVA GSU transformer indicated increasing gassing trends before shut down in 2004 for an internal inspection. Prior t...
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