DSH 541 Transformer overload

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DSH 541 # I. D8 P3 |5 ]- u/ Q7 K  g$ ?

Transformer overload , L% p8 h; k! W# s4 K- b

4.3, 11

60065(ed.6) 6 x; C" P6 J+ N& v% m9 N

0 I( x5 u  C, \5 A: o+ M9 yStandard(s)-(year and edition):
; A9 o4 n! ]1 A/ O3 ]IEC 60065 (1998) 6th Ed
$ c7 g, I) m& m+ BSub clause(s):
' L7 O0 E9 d/ b3 Y, W* F4 Q4.3, 11
Dec. No.
) |; x- |) B9 f' T6 _! HDSH-541
Subject:
Transformer overload
; D% z- z, o5 o9 |Key words:
+ n) ]" _% c* e8 \! nFAULT CONDITIONS
  l+ D) E5 D* CDecision of:
' H/ y1 I) l6 U40th CTL meeting /2003
Question:
! p: Q  @9 P/ \* [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
) X" O5 B+ M: B# C9 q2 ^) _due to a single fault condition (e.g. component failures, short circuit of functional insulation)
9 h+ g  c& m4 b& dan overload situation on a transformer is likely to occur, which approach should be
followed?
) g. I/ ^% o4 I8 y( }' \. k1) The actual overload on the transformer shall be performed, taking into account the 'characteristics' of
+ P, v6 b: s6 O. Z% G+ C* V' D! Eeventual protective devices.
+ u6 f' h6 a$ q" R  a/ o2) All possible single fault conditions shall be performed. For those situations where the protective
device reacts, the current through the protector shall be measured and the characteristic of the
" m8 j8 Z+ |  M  ]* sprotector shall be taken into account.
  _/ w( h" v9 Q7 B+ D. w# r3) No overload condition shall be created, since the standard does not specify this in wording.
% a4 d3 Y, }% p, S9 K4) Other possibilities.
Decision:
Following the standard option 2 from above has to be used.

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