a rapid degeneration which destroys a good bushing in a matter of hours. At present, there is great interest by the electricity supply industry in monitoring the condition of high-voltage bushings. However, some bushings failing early in service are due to failures to control voltage or carry out essential maintenance, while others relate to incipient failure mechanisms built in at manufacture. This view is evidenced by the minority of bushing failures worldwide. References IEC60137-2008, BEAIRA Technical Report Q/T123-1952 Design of High Voltage Stress Controlled Condenser-Type Bushings and Capacitors, BEAIRA Technical Report Q/T125-1952 Stresses in High Voltage Condenser Bushings, BSEN 50180, 50181, 50386 Electric power systems components Electric transformers