The paper describes the development of a core imperfection monitoring and detection system which eliminates the need for a high-voltage high-current excitation winding. The system is based on an electromagnetic testing technique. The paper reports a number of tests conducted in the United Kingdom and USA and gives comparisons of results made with the conventional ring flux test method and the new method. Accuracy of fault location and ease of implementation are discussed.
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C. D. Rickson (1986) studied this question.