2009 Edition, December 9, 2009
Recommended Practice for Insulation Testing of AC Electric Machinery with High Voltage at Very Low Frequency
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Description / Abstract:
This document describes very low frequency (VLF) testing of ac
electric machines. It covers acceptance testing of new machines in
the factory or on-site after erection. Also covered is the routine
maintenance testing of machines that have been in service. In order
to facilitate communication and comparison among investigators,
this document recommends that the VLF used be 0.1 Hz ± 10%.