Laboratory Evaluation of 345-kY Cable 1 High-Pressure Polybutene Oil Pipe-Type Cable After Field Testing at Cornell University

After 3.6 years of overvoltage and high-temperature cycles at the Cornell University High-Voltage Testing Facility,1 sections of a prototype 345-kV 500-MVA cable and joints were returned for evaluation. Dielectric strength and loss were measured on the completed cable. Oil and paper properties were compared with similar tests made prior to the field testing.