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

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DSH 262 & l6 E4 Q7 ?( P" L( B

Application of the tests depending on the insulation class, measurement of temperature on motor wind ... ) C4 p7 e1 F6 z( `! M1 ?

11.5, 11.6

60745-1(ed.2)

Standard: IEC60745-1, Ed.2 Sub clause: 11.5, 11.6 Sheet n. 262
+ F5 o9 Z/ {1 @. k; j# EPage 1(1)
8 K  ]0 e) P2 L$ \7 jSubject: Application of the tests
2 o" J8 ~$ a8 Ddepending of the insulation
$ i  K6 `2 ?! \% vclass, measurements of
temperature on motor
windings
7 |8 w( o# Q$ F" oKey words:
  d5 G8 l  [" \; s2 ^0 M- insulation class,
- resistance variation,
- infrared,
# h) n+ m6 o8 ?- windings
Decision n. 18 taken
  Z* V9 f9 d; v+ `3 mat 35th meeting/1998
0 @. O/ Y6 p2 \( E/ zQuestions:
5 {' f9 E1 T6 ^& g* Z3 U& U. f, V1 - 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
. u1 ?6 Q5 A( dinsulation classes when using 11.6. (This would mean that the test of clause 11.6 is
) Q  \; h/ q7 I& Eapplicable 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:
8 @. [8 _& w! F0 O; v$ K1- The clause 11.6 is applicable for any temperature rise value independently of the
% S9 Z' e5 P' N4 ?( M. Z' jinsulation class
- ~3 y' Y! W  X6 ~) f1 \5 p2- Resistance variation method is generally used, dismantling the motor and extrapolating
) N4 ]5 Z  O8 u8 \1 o2 @with a resistance/time curve, if necessary.
Other methods (Infrared , thermocouples) are not widely used and need to be confirmed.
5 H; ]. M/ ^2 h  R- b