ANSI/IEEE 433:2009
Recommended Practice for Insulation Testing of AC Electric Machinery with High Voltage at Very Low Frequency

Standard No.

ANSI/IEEE 433:2009

Release Date

2009

Published By

American National Standards Institute （ANSI)

Latest

ANSI/IEEE 433:2009

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 very low frequency used be 0.1 Hz +/- 10 percent.

ANSI/IEEE 433:2009 history

• 2009 ANSI/IEEE 433:2009 Recommended Practice for Insulation Testing of AC Electric Machinery with High Voltage at Very Low Frequency