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- W2356372466 abstract "Current transformer(TA)is an important part of the power utility control circuits,and its failure may result in phase to ground fault or high energy explosion which seriously hinders the operation of substations.In order to improve the operation reliability of current transformers,the basic theory and testing technology of frequency dielectric spectroscopy are adopted to introduce a method used for insulation condition and aging diagnosis,which incorporates frequency domain spectroscopy(FDS)and high voltage dielectric loss test.Firstly FDS tests are performed on three 220kV oil-immersed TA.Tanδ-f and C*-f waveforms are obtained for main insulation of each TA.Then high voltage dielectric loss tests are performed on the equipment to obtain tanδ-U waveform,which shows accordance to the FDS results at power frequency and 10kV.Furthermore,it is found that,both serious aging and damp result in increase of moisture content in solid insulation and the dielectric loss at low frequency level;the tanδ-U waveform of insulation affected by aging has a U-shape,and that of insulation affected only by moisture shows similar dielectric loss in the whole tested voltage range,which could be considered as a new approach to distinguish the two situations.It is concluded that,as an reliable tool to evaluate moisture content in papers and conductance of oil,FDS could offer more effective and accurate diagnosis to high voltage TA combining with high voltage dielectric loss tests." @default.
- W2356372466 created "2016-06-24" @default.
- W2356372466 creator A5078909773 @default.
- W2356372466 date "2012-01-01" @default.
- W2356372466 modified "2023-09-25" @default.
- W2356372466 title "Insulation Diagnosis of High Voltage Current Transformer by Frequency Dielectric Spectroscopy" @default.
- W2356372466 hasPublicationYear "2012" @default.
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