IEEE C62.21-2003/Cor 1-2008

This guide covers the application of surge voltage protective equipment to AC rotating machines rated 1000 volts and greater. The guide does not cover motors applied in solid-state switched adjustable speed drives. Part 1 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. Part 2 will cover application of surge protection to generators with form-wound multi-turn coils, plus insulation surge withstand strength and surge protection of single-turn coil generators and motors.

In Table 2: correct an error in the K value for Y grounded primary to Delta secondary connection; and clarify the ambiguity in Y ungrounded primary to Y grounded and Y ungrounded secondary connections. Provide a correct illustrative example of surge protection to a motor by use of the equations in Annexes A.1 and A.2. Make it possible for an IEEE SA staff group to develop software on a CD (a VuSpec to accompany the paper standard that will enable the user to solve these equations for their own problems) to use this standard for that purpose. To enable comparison of the approximate solutions by a Table-Look-Up procedure presented in the main body of the standard with the more accurate solutions by calculator/computer using the equations in Apppendix A.

Corrigendum Standard - Inactive-Reserved. Errors identified in IEEE Std C62.21-2003 are addressed in this corrigendum.