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 ... 8 C5 `0 N% g' `5 |

11.5, 11.6

60745-1(ed.2) " U5 o7 @0 G2 N# V

3 n1 o# N, I! s6 RStandard: IEC60745-1, Ed.2 Sub clause: 11.5, 11.6 Sheet n. 262
) e, x: o1 k/ w# m: bPage 1(1)
Subject: Application of the tests
- e' w: F! x" f# r4 t& d3 u+ @) P% Bdepending of the insulation
( G. W3 n  S* b1 u1 U1 h; aclass, measurements of
# ^; G( v: W  S, g9 K4 l$ htemperature on motor
windings
! B0 T- E; _9 M" c0 B0 fKey words:
- insulation class,
5 k, u% j0 Z4 H% C5 {+ K0 q5 R- resistance variation,
) ]6 t2 k9 s& M( d0 J* B+ Z- infrared,
- windings
Decision n. 18 taken
4 d' G" `: p6 c9 p1 b& j5 P7 Zat 35th meeting/1998
Questions:
3 a6 B% W0 `4 n1 G7 D/ |' g5 H9 x1 - During the heating test the temperature of a known insulation class system exceeds the
" R4 f' w+ [  ?4 \temperature limits specified in sub-clause 11.5. In this case, is it possible to jump multiple
" x6 z+ t' X  |insulation classes when using 11.6. (This would mean that the test of clause 11.6 is
. H' }9 i. w5 S6 B8 _( ^1 eapplicable whatever the value of exceeding temperature rise) ?
2 – How is the measurement of temperatures on armatures windings performed, specially
1 {. |+ f" |. T5 K4 Mwhen the windings of the rotor are not easily accessible? Is it possible to use infrared guns?
- ?% x" m% S' ?, `: QDecisions:
& Y4 L# c! F7 G/ L, j9 l1- The clause 11.6 is applicable for any temperature rise value independently of the
, J, M6 Q5 O6 uinsulation class
2- Resistance variation method is generally used, dismantling the motor and extrapolating
5 m; k5 e* {2 Z$ ?+ k, Lwith a resistance/time curve, if necessary.
& d5 W; a* x, t3 r, C+ `) v; COther methods (Infrared , thermocouples) are not widely used and need to be confirmed.
8 U& _" O" D; d5 s1 j
5 @' E5 P. V, i% [