Project Details
This recommended practice applies to stator coils or bars (half coils) of electric machinery operating at any
voltage level. It usually applies to machines with a voltage rating of 6 kV and higher. Individual stator coils
outside a core (uninstalled), individual stator coils installed in a core, and completely wound stators are
covered in this recommended practice.
The tests apply to all coil insulation systems: pre-impregnated coils, post impregnated coils (global
impregnation), and fully-loaded (resin-rich) taped coils. This recommended practice is not applicable to
non-impregnated individual coils.
The coil insulation under test is the major groundwall insulation that is external to the conductor structure.
Only that part of the strand and turn insulation that is dielectrically in series with the groundwall insulation
enters into the measurements. When testing individual coils and utilizing guard electrodes, only that part of
the groundwall insulation under the low voltage electrode (outer electrode) enters into the measurement.
Standards Committee | |
PAR Approval |
2019-09-05
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PARs |
Additional Resources Details
Historical Base Standard |
Working Group Details
Working Group |
Matl - WG286 - Materials SC - Measurement of Power Factor Tip-Up of Electric Machinery Stator Coil Insulation
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Standards Committee | |
Society | |
IEEE Program Manager | |
Existing Standards |
The power factor tip-up testing of stator coils and bars for use in large electric machineryis covered in this recommended practice.
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