Electrical discharges that do not completely bridge the electrodes are called partial discharges. Although small, these discharges have been known for more than fifty years to cause progressive deterioration. Since 1945 the use of new high voltage dielectrics has required the use of sophisticated detection techniques. Discharge detection has grown into an indispensible tool for the evaluation of modern insulation. The subject has received little attention in books on high voltage techniques although a good deal is scattered in various papers and reports. The object of this book is to collect this knowledge and present it as a coherent study. Topics covered include the behaviour detection and measurement of discharges, the choice of detection method and procedure, the location of discharges and discharge detection in practice.
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