scope:

This guide covers the application of surge voltage protective equipment to ac rotating machines rated 1000 V and greater. The guide does not cover motors applied in solid-state switched adjustable speed drives. This standard, the first part of two parts, covers the insulation surge withstand strength of motors and generators with windings having form-wound multi-turn coils and the application of surge protection to form-wound multi-turn coil motors. The second part will cover application of surge protection to generators with formwound multi-turn coils, plus insulation surge withstand strength and surge protection of single-turn coil generators and motors.