Partial Discharge Tells the Tale: New Zealand utilities adopt cost-effective cable condition monitoring to improve reliability

摘要

THE POPULATION OF AGED CABLES IS INCREASING IN MANY POWER SYSTEMS at a time when there is an increasing demand for energy and improved continuity of supply. Insulation failure of a cable due to partial discharge (PD) can have severe social and economic consequences. Constraints on preventive maintenance work imposed by revenue budgets and a lack of trained technicians, coupled with the need to maintain or improve supply reliability, means that. PD measurements for insulation assessment are a cost-effective diagnostic tool. On-line PD, measurements provide an efficient method for detecting insulation defects, and assessing and monitoring the insulation of cables to prevent in-service failures. Noninvasive, efficient and widely applicable portable on-line PD measurement techniques are now the preferred choice of the electricity industry.