Active PAR

P522

Guide for Testing Turn Insulation of Form-Wound Stator Coils for Alternating-Current Electric Machines

The purpose of this guide is to make suggestions on testing the dielectric strength of the insulation separating the various turns from each other within multiturn 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: (1) Individual stator coils after manufacture (2) Coils in completely wound stators of original manufacture (3) Coils and windings for rewinds of used machinery (4) 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 (VFD's) are also not addressed here.

Sponsor Committee
PE/EM - Electric Machinery
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Joint Sponsors
DEI/SC
Status
Active PAR
PAR Approval
2016-12-07
Superseding
522-2004

Working Group Details

Society
IEEE Power and Energy Society
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Sponsor Committee
PE/EM - Electric Machinery
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Working Group
Matl - WG522 - Materials SC - Turn Insulation of Form-Wound Stator Coils
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IEEE Program Manager
Ashley Moran
Contact
Working Group Chair
Paul Gaberson
No Active Projects
No Active Standards
No Superseded Standards
No Inactive-Withdrawn Standards

522-2004

IEEE Guide for Testing Turn Insulation of Form-Wound Stator Coils for Alternating-Current Electric Machines

Revision of IEEE Std 522-1992 Suggestions are made for testing the dielectric strength of the insulation separating the various turns from each other within multiturn form-wound coils to determine their acceptability. Typical ratings of machines employing such coils normally lie within the range of 200 kW to 100 MW (270 hp to 135 000 hp). The test levels described do not evaluate the ability of the turn insulation to withstand abnormal voltage surges, only surges associated with normal operation. The suggestions apply to: (1) individual stator coils after manufacture; (2) coils in completely wound stators; (3) coils and windings for rewinds of used machinery; and (4) windings of machines in service to determine their suitability for further service (preventive-maintenance testing). Coil service conditions, test devices, and test sequence are discussed.

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