Study on the Deterioration Characteristics of ECR Glass Fiber in Composite Insulators Under Acid-Heat Conditions

During the actual operation of composite insulators, they may be affected by various deterioration factors. Acid generated by partial discharge and abnormal heating may accelerate the deterioration of ECR glass fibers in composite insulators, leading to decay-like fracture of composite insulators. In this article, the deterioration experiment of ECR glass fibers comprehensively considered the effects of acid and temperature. The acid heat deterioration experiment of ECR glass fibers were conducted to investigate the changes in morphology and mechanical properties of ECR glass fibers. The results showed that the degradation effect of acid solution on ECR glass fibers was not significant at room temperature, while the surface of ECR glass fibers deteriorated by acid heat became rough and a large amount of powdery debris appeared; Meanwhile, compared to nitric acid, oxalic acid has a more severe degradation effect on glass fibers. After 12 days of deterioration with 1mol/L oxalic acid at 80 ℃, the tensile strength and elastic modulus of glass fibers decrease by more than 90%; After acid heat degradation, there are a large number of “debris” on the surface of the glass fiber. Fiber damage and fracture phenomena occur at the same time.