本推荐规程提供了一种程序，用于检测在工频额定线间电压大于2300 V的空气中运行的旋转电机的绕线棒和线圈以及完整定子绕组中的外部放电。建议的做法适用于棒、线圈和完整的定子绕组。推荐规程包括两种检查方法:目测断电试验和电晕成像仪器的使用。

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.