Application of optically measuring techniques was attempted to develop harmonics voltage and current measuring instruments for distribution systems. To develop the harmonics voltage measuring system using a Bi12GeO20 crystal as a sensing Pockels cell for high voltage distribution lines, zinc oxide elements were adopted as a voltage divider. Also, an optical current sensor system was improved on the harmonics current measuring system using a R3Fe5O12 film as a Faraday device. Besides, in a practical three-phase distribution systems the developed high voltage harmonics measuring devices using the optical voltage sensor and current sensor were compared with conventional harmonics analyzers for low voltage.
As a result, it was confirmed that the developed high voltage harmonics measuring devices showed successfully good characteristics in practical use.
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