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IEEE 433
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IEEE 433 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%.
Purpose
The purposes of this recommended practice are as follows:
a) To provide a uniform procedure for testing the stator (armature) insulation of ac electric machines with VLF voltage, in order to obtain consistent results
b) To recommend constants for relating VLF tests to power-frequency and direct-voltage tests to obtain equally effective test levels
c) To describe VLF test equipment and wave shape
d) To define terms that have specific meaning in VLF testing.
Purpose
The purposes of this recommended practice are as follows:
a) To provide a uniform procedure for testing the stator (armature) insulation of ac electric machines with VLF voltage, in order to obtain consistent results
b) To recommend constants for relating VLF tests to power-frequency and direct-voltage tests to obtain equally effective test levels
c) To describe VLF test equipment and wave shape
d) To define terms that have specific meaning in VLF testing.