Resin-Bonded Paper Bushings for EHV Systems

The development of resin-bonded paper bushings for extra-high voltages is described. The problems of thermal stability, internal partial discharges, breakdown along laminae, and the manufacture of large insulating bodies are discussed. An evaluation of the merits of resin-bonded and oil-impregnated paper bushing is made. The suitability of new bushing designs is shown by reporting the experiences in operational and experimental networks up to system voltages of 1050 kV.