A Study on RTV Coating: Ageing and Reduction of Coating Length on Insulator

Abstract

The performance of RTV coatings on insulator was not efficient due to degradation of their electrical and mechanical properties with age. The degree of ageing of the RTV coated insulators depends upon the severity in the pollution level of the environment and service voltage. Polymer surface of the insulator exposed to stress for long term due to pollution mechanical and electrical properties will be lost. In present study tracking and erosion test for 1000hrs as per IEC 61109 standards is performed and ageing performance of Type-A, Type-B insulators are evaluated. Inclined plane test is conducted as per IEC 60587 standards for different lengths of RTV coated Insulator to optimize and economize the performance of RTV coated insulator. It was possible to conclude that ageing test on RTV coated insulator is essential to evaluate long term performance of coatings and 1/4 length of the RTV coated insulator is sufficient to withstand the pollution severity.