High / medium voltage power transformers diagnostic examination

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Dr. Németh Bálint
Department of Electric Power Engineering

The high-voltage transformers are essential appliances of the electrical energy-system and greatly affects on the entire system operational safety.

The purpuse of the high-voltage transformer’s diagnostic examination to implement a series of tests - preventing malfunctions or failures, or at least reduce their number - which would minimize the operational costs.

In the first part of my thesis I reviewed the main diagnostic methods.

Using the results of transformers diagnostic tests - received from ELMŰ ÉMÁSZ Network Ltd. – I demonstrated how we can get a comprehensive picture with the diagnostic methods about the appliance’s (insulation, electrical and mechanical) conditon. In addition, I examined - through the diagnostic methods - the errors can be detected the insultation of transformers and other structural parts.

The test results demonstrated that the various diagnostic methods provide information about different part of the appliances, so in order to assess the general condition of the equipment worth to use several diagnostic methods.


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