A winding or bushing type power transformer has heretofore been used for the purpose of measuring (monitoring) high voltages.
A method of measuring the high voltage by means of electro-optical effect has also been proposed. Such method makes use of Pockel's effect or Kerr's effect. The present article relates to study on the fundamental characteristics in case of measuring high voltages with the aid of the electro-optical Kerr's effect.
The present article first shows the experimental results of the temperature characteristic, polarization characteristic, insulation breaking characteristic etc, of nitrobenzene filled in a Kerr cell and then shows the results of measurement obtained by applying DC-high voltage, AC-high voltage or high frequency high voltage to the Kerr cell.
In practice, various matters have to be taken into consideration, particularly the fact that the degree of purity of the nitrobenzene is a very large factor in succeeding in measurement by this method.
The range of measurement may be extended by increasing the gap formed between the electrodes of the Kerr cell. The linearity of the measuring range is good. The present method is easier in applying voltages and more advantageous as an apparatus for measuring the high voltage than the conventional method with the aid of Pockel's effect which makes use of solids (ADP, KDP etc).