Simulation Research on the Effects of Air Gaps and Ambient Temperature on a 27.5 kV Power Cable
Source abstract
Abstract
A 27.5 kV cable is one of the important infrastructures of a high-speed railway traction power supply system, and the reliability of the cable directly affects the stability and safety of the high-speed railway power supply. The cable runs in the complex environment of the laying site and will inevitably face the influence of electrical stress and thermal stress, resulting in air gap and insulation deterioration, which poses a threat to the safety of a high-speed railway traction power supply system. In this paper, an electric–thermal coupling model is built and simulated under normal operating conditions and different cable damage conditions. The distributions of the electric field and thermal field under different conditions of cables are explored. The weak points of a cable with poor heat resistance and easily produced air gaps are found. The influence of various temperature differences on a damaged air gap inside the cable is studied. Finally, the damage mechanism of a further increase in the cable’s air gap caused by partial discharge of the air gap is proven. This study provides a theoretical basis for inhibiting cable degradation and prolonging cable life.
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Research context
OpenAlex topics: Thermal Analysis in Power Transmission · High voltage insulation and dielectric phenomena · Aerodynamics and Fluid Dynamics Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
China Academy of Railway Sciences Corporation Ltd., Beijing 100081, China
College of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Funding
Science and China Academy of Railway Sciences Corporation Limited · National Nature Science Foundation of China
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