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The Investigating of Winding Failure on 50 MVA Power Transformers by Performing SFRA Combined with Traditional Measurement
Author(s)
Singkhawat, Pongpon
Date Issued
October 25, 2020
Type
Conference Paper
Abstract
This paper presents the assessment for transformer winding's conditions by using the test method in terms of Sweep Frequency Response Analysis (SFRA), short-circuit leakage impedance, and winding capacitance measurement. The strength and weaknesses of the mentioned test methods are discussed in detail. The investigation of two power transformers rated of 50 MVA 115-23 kV is presented. The insulation condition of the first transformer was extremely risky. This transformer was experienced with the severely fault current and then was tripped out from the system. The test results indicated that one phase winding of this transformer deformed and eventually led to a shorted turn. For the second transformer, it was subjected to frequent non-severe external faults; the condition of this transformer was regularly investigated after each fault occurrence. The test results showed that the winding is likely to be deformed. Therefore, it was replaced by a new transformer to prevent sudden failure, which may happen if the defected transformer was still used in the power system. From these experiences, it is shown that the combination testing methods are needed to provide the efficiency investigation of the transformer problems.
Citation
Proceeding 8th International Conference on Condition Monitoring and Diagnosis Cmd 2020, 122-125, 2020