Investigations on rain fog pollution test

• Published in: 11th International Symposium on High-Voltage Engineering (ISH 99) pp. 4.111.S25 - 4.114.S25
• Main Authors: Devandranath, D, Nirgude, P.M, Rao, G.V, Shivakumara Aradhya, R.S, Sudheer, A.P, Mohan Rao, N.S, Channakeshava
• Format: Conference Proceeding Journal Article
• Language: English
• Published: London IEE 1999
• Subjects: Applied sciences; Dielectric materials and properties; Electrical engineering. Electrical power engineering; Exact sciences and technology; Insulation and insulating coatings; Power line supports, insulators and connectors; Testing. Reliability. Quality control; wetting; electric breakdown; insulator testing; IEC 507; insulator rain fog pollution testing; wetting action test; layer conductance test; insulator contamination; pollution layer wetting; withstand capability; test facility; nine disc insulator string; solid layer test method; Test method; Salt spray test; Pollution; Electric insulating material; Electric discharge
• ISBN: 0852967195; 9780852967195
• ISSN: 0537-9989
• DOI: 10.1049/cp:19990805

In the solid layer test method, it is mentioned that warm or cold water may be used, instead of steam for wetting the pollution layer. So an attempt is made to perform the solid layer test with the wetting action obtained from tap water, called the rain fog test. An important aspect of this method is that the existing spraying system of the salt fog method is used for the development. This will simulate the actual conditions of the pollution layer wetted with slight rain or drizzle or mist. In the rain fog method, the insulator is coated with a pollution whose layer conductivity simulates the site condition and tap water fog is applied to the insulator to simulate the actual rain, dew or drizzle. The withstand capability of the insulator string is tested as specified in IEC 507, 1991. To standardize the rain fog test facility, two tests are conducted viz. wetting action test (layer conductance test) and reference test on a nine disc insulator string. These two tests are identical to the tests necessary to standardize the solid layer test facility as specified in IEC-507. The rain fog test is a combination of salt fog test as well as solid layer test facility. (4 pages)