Development of the Portable Demagnetizing Apparatus of a New Type GIS Current Transformer
In view of the problem of uorse demagnetizing effect of the demagnetizing apparatus of a traditional cur-rent transformer,develop a complete set of demagnetizing apparatus of the portable GIS current transformer,on the basis of AC way,set up demagnetizing apparatus parameters according to selective results.On the basis of DC way,use constant voltage frequency mothed and constant frequency varying voltage mothed to control residual magnetism.Based on the voltage method to design secondary winding excitation admittace degaussing circuit.By the experi-ment,contrast the apparatus in the paper with traditional apparatus A and B.The experiment results show that under the same current ratio and exert voltage conditions,the degaussing ratio of traditional apparatus is 75.2%and 86.3%.The deaussing ration in the paper is up to 96.5%.The experiment is successful.
GIS current transformerportable demagnetizing apparatusDC way