Cause Analysis of Abnormal Increase in Acetylene Volume Fraction in Ultra-high Voltage Converter Transformers and Preventive Measures
The phenomenon of abnormal increase in acetylene volume fraction in low-voltage converter transformers of a ultra-high voltage converter station is analyzed.The oil chromatography data,core grounding current and clamp grounding current,load,temperature,and operation of on-load tap changers of the low-voltage converter transformers are analyzed,the comparison with the high-voltage converter transformers is conducted,the fault type is identified,the reason for the abnormal increase in acetylene volume fraction is determined.Finally,the corresponding preventive measures are proposed so as to ensure the safe operation of ul-tra-high voltage converter transformers.
ultra-high voltageconverter transformeracetyleneon-load tap changer
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