We have a number of old style "last forever" mechanical Magneblasts. Per EPRI, AM-13.8 nominal timing is 100 ms for Close and 50 ms for Open. I spoke with GEXPRO and apparently these values are meant for a newly manufactured breaker or GE factory rebuild.
Does anyone out there have any...
thread238-219928 In megger's "A guide to Diagnostic Insulation Testing above 1kV" The paragraph before the Step Voltage Test section states that PI testing is not appropriate for oil filled transformers. I went to the AVO Megger Substation Maintenance Class which does instruct performing the...
