DSH 262 Application of the tests depending on the insulation class, measurement

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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)

3 K1 d7 Y& m& tStandard: IEC60745-1, Ed.2 Sub clause: 11.5, 11.6 Sheet n. 262
) G8 }$ J( J% H- QPage 1(1)
Subject: Application of the tests
. U+ `4 L9 ?' h: b# t5 U/ L/ Udepending of the insulation
+ D! \" {5 J6 S# f; rclass, measurements of
% e8 P8 W; W  a2 Dtemperature on motor
. N+ ]. ?5 i' T) o6 U$ `2 Vwindings
) {5 a( X( Z% k. b: D2 z# KKey words:
- insulation class,
- resistance variation,
- infrared,
- windings
Decision n. 18 taken
* j4 X1 o* X$ Q* M/ n5 n) d* Cat 35th meeting/1998
3 Q% F! m9 k4 O, A* ]" e7 b& MQuestions:
" n1 v. \' }' P6 a6 M0 w1 H1 - During the heating test the temperature of a known insulation class system exceeds the
5 X1 |9 c1 N4 N6 G8 K9 o# ~1 r, Vtemperature 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?
$ u7 u' w; g) q# T: v. ^! w: mDecisions:
1- The clause 11.6 is applicable for any temperature rise value independently of the
% p% Y5 F! N% s& j' h# \insulation class
' t* n: D7 r' l) K: {1 b2- Resistance variation method is generally used, dismantling the motor and extrapolating
1 p9 T) K1 `. V' C1 A3 n- ywith a resistance/time curve, if necessary.
Other methods (Infrared , thermocouples) are not widely used and need to be confirmed.
7 t/ m8 ~1 E% K0 T2 Z, O2 ?+ R