DSH 262 Application of the tests depending on the insulation class, measurement
http://decisions.iecee.org/icons/ecblank.gif DSH 262
Application of the tests depending on the insulation class, measurement of temperature on motor wind ...
11.5, 11.6
60745-1(ed.2)
Standard: IEC60745-1, Ed.2 Sub clause: 11.5, 11.6 Sheet n. 262
Page 1(1)
Subject: Application of the tests
depending of the insulation
class, measurements of
temperature on motor
windings
Key words:
- insulation class,
- resistance variation,
- infrared,
- windings
Decision n. 18 taken
at 35th meeting/1998
Questions:
1 - During the heating test the temperature of a known insulation class system exceeds the
temperature limits specified in sub-clause 11.5. In this case, is it possible to jump multiple
insulation classes when using 11.6. (This would mean that the test of clause 11.6 is
applicable whatever the value of exceeding temperature rise) ?
2 – How is the measurement of temperatures on armatures windings performed, specially
when the windings of the rotor are not easily accessible? Is it possible to use infrared guns?
Decisions:
1- The clause 11.6 is applicable for any temperature rise value independently of the
insulation class
2- Resistance variation method is generally used, dismantling the motor and extrapolating
with a resistance/time curve, if necessary.
Other methods (Infrared , thermocouples) are not widely used and need to be confirmed.
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