DSH 541 Transformer overload

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DSH 541 0 m- m( c' ~' F; h0 L" K9 }

Transformer overload * T' }- L& a7 N. N: o8 [- H

4.3, 11 ( q; l- C1 e  @0 d; \3 `

60065(ed.6) ) ?6 t: @( }  u" W; e' a

4 a, V( V% N9 b2 YStandard(s)-(year and edition):
IEC 60065 (1998) 6th Ed
Sub clause(s):
2 k2 r& Z$ V' [/ s) I4.3, 11
6 Y: `' s4 o6 l/ i7 X" M5 Q9 [: YDec. No.
9 h  C. k# N+ FDSH-541
' V7 t3 y' o8 B) M' J" QSubject:
Transformer overload
$ N7 U9 H5 l) ?+ O% @9 E6 {Key words:
FAULT CONDITIONS
Decision of:
40th CTL meeting /2003
Question:
The standard does not specify a transformer overload test, as there is, , for example, in IEC 60950.,
If it is obvious, based on engineering judgment of the technical design of the product, that
due to a single fault condition (e.g. component failures, short circuit of functional insulation)
; \2 j8 v) Y9 han overload situation on a transformer is likely to occur, which approach should be
followed?
. H' {: u) W) t' s: J0 V6 ?1) The actual overload on the transformer shall be performed, taking into account the 'characteristics' of
eventual protective devices.
! ~" t( ?$ G6 j' \4 n2) All possible single fault conditions shall be performed. For those situations where the protective
3 ~4 i& P+ W* z" d5 V# i+ _device reacts, the current through the protector shall be measured and the characteristic of the
1 ~/ L  C6 f! c8 e8 Q3 Kprotector shall be taken into account.
3) No overload condition shall be created, since the standard does not specify this in wording.
, O+ C! G* l& V0 x4) Other possibilities.
8 J, A% `$ d: {- D. j7 o5 N* IDecision:
4 I  j2 W/ n- o' Q# |Following the standard option 2 from above has to be used.
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