Insulation Boards in Switchgear at Navy Shore Facilities.
Abstract
The Civil Engineering Laboratory was tasked to determine the cause of failures experienced with the insulation boards used in recently procured electrical power switchgears at Navy Shore Facilities. Phenolic and polyester glass materials used as bus supports (the area of failure) were tested under high voltage to ascertain their time-to-track resistance properties. Also samples of the same materials were coated with silicone grease and tested. It was found that polyester glass insulation material meeting the requirements of MIL-M-14G Type MAT-30 will provide reliable service when used as bus supports in 15-kv switchgear. The application of silicone grease caused little improvement in the track-resistance properties, and under certain environments could cause an adverse condition. Porcelain insulating material will not track and, under adverse environments, is the best material for bus supports.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1974
- Accession Number
- ADA004939
Entities
People
- David E. Weems
Organizations
- Naval Facilities Engineering Service Center