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Effect of voltage waveforms of HVDC converter transformer on lifetime characteristics

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dc.contributor.author Thind, B. S.
dc.contributor.author Thomas, A. J.
dc.contributor.author Reddy, C. C.
dc.date.accessioned 2021-10-26T20:15:20Z
dc.date.available 2021-10-26T20:15:20Z
dc.date.issued 2021-10-27
dc.identifier.uri http://localhost:8080/xmlui/handle/123456789/3150
dc.description.abstract The converter transformers are reported to fail generally on the thyristor-valve side, where complex alternating voltage waveforms superimposed with dc voltages would occur. The effect of these waveforms on the failure and endurance of the valve side winding insulation of the transformers is not yet understood, which is investigated here. In this paper, the voltage waveforms occurring in a converter transformer are obtained through PSCAD/EMTDC for a typical double pole ±500 kV, 1000 MW DC-link HVDC transmission system based on the CIGRE benchmark system. The waveforms are then amplified using a High Voltage amplifier for experimental breakdown investigations. Stepped-stress damage equalization method has been used for obtaining the lifetime characteristics from failure data. A comparison with life curve under pure sinusoidal and actual alternating voltages with superimposed dc and harmonic voltage has been made to understand why the converter transformers generally failed on the valve side. The results first time give fundamental reasons for the possible failure of the converter transformers and put forth important design considerations en_US
dc.language.iso en_US en_US
dc.subject Converter transformer failure en_US
dc.subject harmonics en_US
dc.subject HVDC insulation en_US
dc.subject life estimation en_US
dc.subject voltage endurance coefficient en_US
dc.subject electric breakdown en_US
dc.subject aging en_US
dc.subject damage equalization en_US
dc.title Effect of voltage waveforms of HVDC converter transformer on lifetime characteristics en_US
dc.type Article en_US


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