Insulators Are Not Suitable For Comprehensive Thermo-electrical-mechanical Verification Under Fault Short-circuit Conditions.

In the design and operation of high-voltage transmission systems, insulation material high voltage transmission line insulators performs supporting and insulating functions under normal operating conditions. However, in the event of a short circuit, the coupling effects of heat, electric field, and mechanical loads on 111 exceed the conventional design limits. In the event of a sudden increase in short-circuit current, insulation material overhead power line insulators experiences severe heat accumulation and electromagnetic force impact. This multi-physics coupling effect cannot be fully reflected by traditional thermo-electric-mechanical verification methods. Existing thermo-electric-mechanical verification mainly relies on conventional load conditions and lacks a sufficiently quantitative model for the time-history characteristics of temperature rise and mechanical response of insulation materials under short-circuit conditions. This may lead to biased assessments of the actual stress state of insulation material tension insulator.