Reclassification of askarel transformers-field application and results

Several field-proven processes are now available by which pure askarel (PCB) transformers may be reconditioned with guaranteed reclassification to non-PCB status of less than 50 p.p.m. One such proprietary procedure, introduced by Westinghouse, by which more than 60 commercially owned transformers have been reclassified at very low PCB levels following a few months of processing and 90 days of in-service waiting period, is discussed. The process, the extensive test program, and actual case history results are discussed.<>