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

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DSH 262 1 J$ X" q6 @  }/ ?! g  v . z8 Q( ]% a5 @8 K) C- b

Application of the tests depending on the insulation class, measurement of temperature on motor wind ... $ v- O& b$ {6 p; E+ h4 ]) M& m

11.5, 11.6 8 M4 @5 A; X; g2 j

60745-1(ed.2)

Standard: IEC60745-1, Ed.2 Sub clause: 11.5, 11.6 Sheet n. 262
Page 1(1)
/ p5 W9 @; V2 P$ [" O* ZSubject: Application of the tests
1 H: I# L' }; {. kdepending of the insulation
! M( h8 [+ m5 J! r& z* c1 @class, measurements of
temperature on motor
windings
" }' u  X. Z# mKey words:
3 c' T) e7 C" ^- insulation class,
8 e4 w7 P3 j* l3 U: }( X- resistance variation,
- infrared,
- windings
4 h4 f- [9 e  u$ T! r& JDecision n. 18 taken
at 35th meeting/1998
Questions:
- n4 s+ ?* Y6 k6 ~2 P( C1 - 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
6 x, ?6 W4 }+ {# Uinsulation classes when using 11.6. (This would mean that the test of clause 11.6 is
9 A# ^( ]* [) }applicable whatever the value of exceeding temperature rise) ?
2 I  j! \( b! \. e  `6 }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?
+ E+ {3 D+ j$ T( J& UDecisions:
. G0 C' e0 v+ d8 [7 A1- The clause 11.6 is applicable for any temperature rise value independently of the
insulation class
5 m9 w/ W4 Z% c& g' j2- Resistance variation method is generally used, dismantling the motor and extrapolating
. n& n7 F7 z: C& i# zwith a resistance/time curve, if necessary.
) ]  V/ G  h/ G, VOther methods (Infrared , thermocouples) are not widely used and need to be confirmed.