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IEEE 522-2023

Current Revision

IEEE Guide for Testing Turn-to-Turn Insulation on Form-Wound Stator Coils for Alternating-Current Rotating Electric Machines

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Revision Standard - Active. Made in this guide are suggestions on testing the dielectric strength of the insulation separating the various turns from each other within multi-turn form-wound coils to determine the acceptability of the coils. Typical ratings of machines employing such coils normally lie within the range of 200 kW to 100 MW. Test voltage levels described herein do not evaluate the ability of the turn insulation to withstand abnormal voltage surges, as contrasted to surges associated with normal operation. These suggestions apply to the following: a) Individual stator coils after manufacture b) Coils in completely wound stators of original manufacture c) Coils and windings for rewinds of used machinery d) Windings of machines in service to determine their suitability for further service (preventive-maintenance testing) The repetitive voltage surges (spikes) associated with Variable Frequency Drives (VFDs) are not addressed here.
This guide makes suggestions on testing the dielectric strength of the insulation separating the various turns from each other within multi-turn form-wound coils to determine the acceptability of the coils. Typical ratings of machines employing such coils normally lie within the range of 200 kW to 100 MW. Test voltage levels described herein do not evaluate the ability of the turn insulation to withstand abnormal voltage surges, as contrasted to surges associated with normal operation. These suggestions apply to the following: a) Individual stator coils after manufacture b) Coils in completely wound stators of original manufacture c) Coils and windings for rewinds of used machinery d) Windings of machines in service to determine their suitability for further service (preventive-maintenance testing) The repetitive voltage surges (spikes) associated with Adjustable Speed Drives (ASDs) are not addressed here.
This guide will address the following: a) Define surge/impulse testing as applied to the windings of an electric machine; b) Review the service conditions which affect or change voltage levels in a coil; c) Recommend devices suitable for measuring surges, with precautions to avoid erroneous results; d) Describe various points in time at which surge testing should be performed; e) Present suggested surge test levels for form-wound multi-turn coils.

SDO IEEE: Institute of Electrical and Electronics Engineers
Document Number 522
Publication Date Oct. 30, 2023
Language en - English
Page Count 34
Revision Level
Supercedes
Committee Electric Machinery
Publish Date Document Id Type View
Oct. 30, 2023 522-2023 Revision
Aug. 9, 2004 522-2004 Revision
Sept. 11, 1992 522-1992 Revision
Feb. 25, 1977 522-1977 Revision