IEEE 1799-2022

This recommended practice provides procedures to detect external discharges in form-wound bars and coils and complete stator windings of rotating machines operating in air with a rated line-to-line voltage greater than 2300 V at power frequency. The recommended practice is applicable to bars, coils, and complete stator windings. The recommended practice covers two inspection methods--the visual blackout test and the use of corona imaging instruments.

The purpose of this recommended practice is to suggest specimen preparation, test parameters, and procedures for detecting external discharges associated with bars, coils, and complete stator windings using the above-mentioned methods. It also recommends acceptance criteria and a procedure for retest in the event of a test failure.

Revision Standard - Active. The procedure for quality control testing of external discharges on stator coils, bars, and windings of large air-cooled ac electric machines is described in this recommended practice.