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

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DSH 262 6 d9 c6 a+ ?6 b# C8 g! H/ C

Application of the tests depending on the insulation class, measurement of temperature on motor wind ... 8 C6 ^7 H! r! M( F& O; K

11.5, 11.6

60745-1(ed.2)

Standard: IEC60745-1, Ed.2 Sub clause: 11.5, 11.6 Sheet n. 262
; p1 T8 _" X5 f. a# D6 DPage 1(1)
Subject: Application of the tests
depending of the insulation
" C% N, d; t( C* y6 [, Eclass, measurements of
temperature on motor
, t$ K6 l" e( l2 L! [windings
; t$ X5 l/ m7 A- ?5 x9 `0 UKey words:
  y$ o' ^( R+ [2 O7 {- insulation class,
* B4 a' n6 N( h) {: [0 z5 ]- resistance variation,
; {. g2 J5 M  g8 ^- infrared,
' e! T2 `- `* R- }5 Z- windings
Decision n. 18 taken
at 35th meeting/1998
Questions:
5 p4 f' i9 n, L8 u- O1 - 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
& a! B/ {) y8 V! L3 O& Dinsulation 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?
Decisions:
1- The clause 11.6 is applicable for any temperature rise value independently of the
insulation class
1 @5 t0 X+ }8 o2- Resistance variation method is generally used, dismantling the motor and extrapolating
with a resistance/time curve, if necessary.
Other methods (Infrared , thermocouples) are not widely used and need to be confirmed.
, U3 R$ K& u+ W; V& V1 V