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IEC/TR 60894

Guide for a Test Procedure for the Measurement of Loss Tangent of Coils and Bars for Machine Windings

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Organization: IEC
Publication Date: 1 March 1987
Status: inactive
Page Count: 24
ICS Code (Components for rotating machines): 29.160.10
scope:

The characteristics of an insulation system can be evaluated in terms of dielectric strength, insulation resistance, dielectric loss, etc.

This report is applicable to a method of measuring dielectric loss properties of the insulation system of the slot portions of new coils or bars for rotating electrical machines having rated voltage UN of 5 kV and above.

The test is applicable to form wound coils or bars in which the insulation is cured before the winding is inserted in the stator.

For tests on post-impregnated machines, see Appendix A.

Object

The uniformity of manufacture is judged to some extent by measurement of the dielectric loss tangent as a function of voltage and by statistical evaluation of the test results.

For a known insulation system, the following properties can be assessed:

 - a low loss tangent at low voltage (0.2 UN) indicates a high degree of molecular crosslinking of the bonding medium (degree of resin cure),

 - the magnitude of delta tan delta by increase of voltage gives some indication of the void content  of the insulation.

Document History

IEC/TR 60894
March 1, 1987
Guide for a Test Procedure for the Measurement of Loss Tangent of Coils and Bars for Machine Windings
The characteristics of an insulation system can be evaluated in terms of dielectric strength, insulation resistance, dielectric loss, etc. This report is applicable to a method of measuring...

References

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