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access icon free Influences of low temperature on internal gas-filled cavity discharges in EPR cable termination and its feature factors analysis

© The Institution of Engineering and Technology
Received 03/04/2020, Accepted 16/11/2020, Revised 17/07/2020, Published 08/01/2021

Ethylene–propylene rubber (EPR) cable is the most commonly used type in high-speed railway. Several flashover accidents take place in cable termination in an extremely cold environment. In this study, EPR cable terminations were tested in a simulated low-temperature system with varied applied voltages. The results showed that the differences in elastic modulus and free space volume between EPR insulation and stress control tube (SCT) in a frigid environment would lead to structural defects between them. Damages on the EPR insulation occurred in the form of flashover point when the ambient temperature declined to −30°C and below, with the growth rate of discharge and resulting extent of damage across the EPR/SCT interface being non-linearly related to ambient temperature. Besides, the partial discharge (PD) initial voltage and PD extinction voltage under low-temperature conditions reduced by >40% compared with those at 20°C. The flashover probability of EPR terminations increased significantly, and the shape characteristics of PD patterns have also changed obviously at low temperatures. It can be verified that under the high-voltage and low-temperature conditions, the EPR/SCT interface is prone to organisational mismatch, which will lead to the PD phenomenon and seriously affect the stable operation of EPR cable terminations.

Inspec keywords: flashover; electric connectors; power cable insulation; elastic moduli; partial discharges; ethylene-propylene rubber

Other keywords: partial discharge initial voltage; EPR insulation; internal gas-filled cavity discharges; ambient temperature; low-temperature system; temperature -30.0 degC; PD initial voltage; ethylene-propylene rubber cable; temperature 20.0 degC; low-temperature conditions; high-speed railway; feature factors analysis; EPR cable termination; flashover probability; flashover accidents; EPR-SCT interface; stress control tube; PD extinction voltage

Subjects: Dielectric breakdown and discharges; Power cables; Organic insulation; Power line supports, insulators and connectors

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