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IEEE 286
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IEEE 286 March 30, 2000 Recommended Practice for Measurement of Power Factor Tip-Up of Electric Machinery Stator Coil Insulation
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Description / Abstract:
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.
Purpose
The purpose of this recommended practice is to describe the power factor and the power factor tip-up of the coil insulation and to specify test procedures for their measurements.
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.
Purpose
The purpose of this recommended practice is to describe the power factor and the power factor tip-up of the coil insulation and to specify test procedures for their measurements.