IEEE - 433
Recommended Practice for Insulation Testing of AC Electric Machinery with High Voltage Rating up to 30 kV at Very Low Frequency
| Organization: | IEEE |
| Publication Date: | 9 February 2022 |
| Status: | active |
| Page Count: | 30 |
scope:
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%. For ac electric machines, voltages between 3.3 kV to 30 kV are considered to be high voltage machines.
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
Document History
