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A precision transformer used for an audio-frequency power standard

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2 Author(s)
Deshi Zhang ; Nat. Inst. of Metrol., Beijing, China ; Yaolan Jia

A precision current transformer for the audio-frequency band in which an auxiliary current transformer equalizes the potential along the primary and secondary windings of the main current transformer is discussed. The arrangement results in a dramatic reduction of capacitive leakage current. In this way, a ratio error of less than 10 p.p.m. and phase angle error of less than 10 μrad is achieved at frequencies up to 10000 Hz

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Instrumentation and Measurement, IEEE Transactions on  (Volume:39 ,  Issue: 3 )