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

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DSH 262 : ]" M* @; k, \" D  c

Application of the tests depending on the insulation class, measurement of temperature on motor wind ...

11.5, 11.6

60745-1(ed.2) 1 U: w! M7 Y" h3 W. [

Standard: IEC60745-1, Ed.2 Sub clause: 11.5, 11.6 Sheet n. 262
Page 1(1)
Subject: Application of the tests
6 f, F' @3 q9 X; H' I" e" o0 _+ fdepending of the insulation
' g- m& B1 a1 ]$ g5 X+ n+ Uclass, measurements of
8 e. J  y/ U, {; ~temperature on motor
windings
. w" C9 ^! e. MKey words:
- insulation class,
- resistance variation,
- infrared,
1 o5 d( r( N7 H) K! }- windings
Decision n. 18 taken
) B) H2 q5 L* C5 N. A* R/ rat 35th meeting/1998
Questions:
; Q( q. Q4 J$ K' n; R9 v6 N1 - During the heating test the temperature of a known insulation class system exceeds the
& f) R1 C2 ~* O  g+ Ptemperature 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
2 g$ B9 S+ Z8 T" Q6 e$ a9 japplicable whatever the value of exceeding temperature rise) ?
3 J' v& n! Q& {6 D2 – 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
0 w4 ^. z0 i* d4 H' y8 ^$ O# t& ?insulation class
! w4 a- p3 c: g# i# Y' {2- Resistance variation method is generally used, dismantling the motor and extrapolating
) z6 U* K, {$ hwith a resistance/time curve, if necessary.
Other methods (Infrared , thermocouples) are not widely used and need to be confirmed.