IEEE 286 Recommended Practice for Measurement of Power Factor Tip-Up of Electric Machinery Stator Coil Insulation

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IEEE 286 Document Information:

Title
Recommended Practice for Measurement of Power Factor Tip-Up of Electric Machinery Stator Coil Insulation

The Institute of Electrical and Electronics Engineers, Inc.

Publication Date:
Mar 30, 2000

Scope:

Foreword

This power factor tip-up test for stator coils has been used by electric machinery manufacturers and users since the original standard was issued in 1968. The original versions discussed minimally the theory of measurements. In this updated version, additional theory of the measurement and additional procedures are given for individual stator coils and bars and completely assembled windings.  

Scope

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.

Keywords:

electric generators

stator winding

power factor

stator bar

cell capacitance

tan delta

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