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 135000 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.
IEEE 522-2004 history
2023IEEE 522-2023 IEEE Guide for Testing Turn Insulation of Form-Wound Stator Coils for Alternating-Current Electric Machines
2004IEEE 522-2004 Guide for Testing Turn Insulation of Form-Wound Stator Coils for Alternating-Current Electric Machines
1992IEEE 522-1992 Guide for testing turn-to-turn insulation on form-wound stator coils for alternating-current rotating electric machines
1977IEEE 522-1977 Guide for Testing Turn-to-Turn Insulation on Form-Wound Stator Coils for Alternating-Current Rotating Electric Machines-For Trial Use