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

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DSH 262 * p# F0 R& o2 j

Application of the tests depending on the insulation class, measurement of temperature on motor wind ... 4 y$ s. t4 k3 x( h/ w8 ^0 U) P# ]' C

11.5, 11.6   _3 ~1 @# x! Y8 ?

60745-1(ed.2)

Standard: IEC60745-1, Ed.2 Sub clause: 11.5, 11.6 Sheet n. 262
# g1 P- \& i& `% q; IPage 1(1)
Subject: Application of the tests
+ o. C/ a7 @' Adepending of the insulation
class, measurements of
temperature on motor
" i6 ^! M: H) }windings
Key words:
- insulation class,
! F. g3 Z" w" S: t, W' u5 j- resistance variation,
- infrared,
- windings
% w- E7 P+ \( Y5 i5 SDecision n. 18 taken
at 35th meeting/1998
) K( B' q7 {& d3 }) j2 k  vQuestions:
+ F" U2 |% I: z0 F8 {$ \% c1 - 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
7 O) e% u6 |1 p9 B% X; P/ v2 B* x( W2 W4 Vapplicable whatever the value of exceeding temperature rise) ?
5 G7 |* X' i/ e2 – 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:
* i8 N& ]- s7 a+ h! f: i4 L1- The clause 11.6 is applicable for any temperature rise value independently of the
insulation class
/ A" c9 P7 a0 E! m* C' t2- Resistance variation method is generally used, dismantling the motor and extrapolating
$ R8 H  @6 F  v* J4 z! ?& ?with a resistance/time curve, if necessary.
( h9 R2 T5 |, z: V: k6 {; bOther methods (Infrared , thermocouples) are not widely used and need to be confirmed.