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The working principle of a electric current transformer is based onelectromagnetic induction, mainly composed of a closed iron core and windings.Its primary winding has relatively few turns and is connected in series withthe current circuit to be measured. However, due to the frequent occurrence offull current passing through the current transformer during use, its secondarywinding has relatively more turns. During use, errors may occur in the currenttransformer. Therefore, technical personnel can adopt the heterodynemeasurement method to shield interference signals and ensure the accuracy ofmeasurements during on-site examining and repairing of current transformers.This article mainly introduces the characteristics of transformers and theiron-site examining and repairing process and errors, and describes the specificapplication of heterodyne measurement in on-site examining and repairing ofcurrent transformers.

Introduction of an intriguing approach for eletric current transformer on-site examining repairing