Cause Analysis and Preventive Measures Research on Secondary Voltage Reduction of 220 kV Capacitor Voltage Transformer
In this paper,a typical case of secondary voltage reduction fault of 220 kV capacitor voltage transformer is introduced.Through the charge detection,test analysis,disassembly inspection and other links,the abnormal data in the process of excita-tion,conversion ratio,oil chromatography and other tests were analyzed.There are two main reasons for the secondary voltage reduction fault.Firstly,the high-voltage wiring terminal of the intermediate transformer of the electromagnetic device was not reliably tightened,forming a series contact resistance of the primary loop.Secondly,the quality of the secondary winding lead in-sulation was poor,and local cracking occured during operation,resulting in secondary winding parallel contact resistance.Com-bined with the causes,preventive measures are put forward from the aspects of product design,manufacturing,selection and e-quipment daily operation and maintenance inspection.
capacitor voltage transformersecondary voltagesecondary windingcontact resistance
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