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

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DSH 262 " ~- ^. k# x& _+ c3 S % m1 _+ {' a3 t: f9 b

Application of the tests depending on the insulation class, measurement of temperature on motor wind ...

11.5, 11.6

60745-1(ed.2) # S: m' ]& m' \

Standard: IEC60745-1, Ed.2 Sub clause: 11.5, 11.6 Sheet n. 262
Page 1(1)
8 b* ~. M8 j! @* L: S# F0 p$ B2 V* l) G2 ISubject: Application of the tests
" e. O' m6 j: f/ \( Xdepending of the insulation
  y% d& B% W8 v7 ?class, measurements of
temperature on motor
windings
2 v  X. |  H7 H4 x  w0 F$ QKey words:
- insulation class,
- resistance variation,
9 T0 `% y2 q9 ~1 @- infrared,
- windings
% o& J8 V" J9 ?* U' zDecision n. 18 taken
6 _2 }' }- n, j6 }, O# Mat 35th meeting/1998
% C$ O& ^" D) `# L8 CQuestions:
6 t- G4 F/ Z8 }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
$ c8 n. s/ E. Rinsulation 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
$ o" [- }. n! B5 ?3 r: h! Z2 Uwhen 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
) H2 r: Q0 }3 R2 M! _2- Resistance variation method is generally used, dismantling the motor and extrapolating
# p$ U: T% u5 M" n& k9 ^with a resistance/time curve, if necessary.
% |- ^* v% X! `Other methods (Infrared , thermocouples) are not widely used and need to be confirmed.
. E7 G# b7 ]$ Q* D% A: E8 ^/ K