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Accurate measurement of distorted, noisy and pulsed currents is still a challenge. Current transformers introduce unacceptable errors in magnitude and/or phase shift. Rogowski coils are useful for clamp-on field measurements, but can be cumbersome to use. This paper presents a transducer consisting of coreless transformer and a non-integrating electronic amplifier. Calibration of two prototype transducers,...
This paper presents a novel resonant frequency tracking control method for the full bridge type high frequency inverter. The proposed method uses only one AC current transformer though a general PLL as a frequency control method uses 2 current or potential transformers. Furthermore, the high frequency inverter system does not need to employ an active converter to control the DC bus voltage for the...
A novel optical fiber DC current transformer (OFDCCT) with advantages of robustness to the electromagnetic field, flexibility to the install condition, simple structure and electrical insulation has been developed. In this paper, some measurement results which are difficult to be realized by a conventional current sensor are shown. Such results emphasize the advantages of the OFDCCT. Furthermore,...
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