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 1 c0 @! i6 e# O8 X% o$ w- x

60745-1(ed.2)

Standard: IEC60745-1, Ed.2 Sub clause: 11.5, 11.6 Sheet n. 262
6 C9 L. H) ^; O7 h" tPage 1(1)
! S( x  B8 D, LSubject: Application of the tests
depending of the insulation
1 h# z) Q1 i+ hclass, measurements of
1 A9 c  {" b( u; z+ [# }temperature on motor
windings
Key words:
- insulation class,
! R8 t' f, [1 V' m1 ^& k4 Z- resistance variation,
- infrared,
* H# ?3 a7 d- W7 {- windings
; ?  B$ |3 p: _- F- s# c, _Decision n. 18 taken
at 35th meeting/1998
. V) T7 S( l$ c2 q7 H$ Z6 v+ U; dQuestions:
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
8 @3 }) J8 a; a; y2 h5 Dapplicable 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?
) S/ X5 g: y' t/ P* x' ~' LDecisions:
8 L" _% s1 S6 r8 i5 J1- 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
+ `- c% \5 [, C; f" D* Mwith a resistance/time curve, if necessary.
Other methods (Infrared , thermocouples) are not widely used and need to be confirmed.

/ v; F# t) C! E% @