DSH 541 Transformer overload

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DSH 541 # f2 [1 e- x  }9 N5 `8 ?& K

Transformer overload

4.3, 11 6 J" A- {/ l+ V7 ]! p

60065(ed.6) + j7 e3 p0 j, a9 j

7 h/ Z1 S6 ~8 `+ lStandard(s)-(year and edition):
IEC 60065 (1998) 6th Ed
Sub clause(s):
4.3, 11
Dec. No.
DSH-541
Subject:
8 O8 L) y. S) h  W5 D- aTransformer overload
Key words:
FAULT CONDITIONS
1 j) _7 }% l2 V, H% R5 a) {; SDecision of:
: H) R+ ?* Y; W* o; Y5 e: u! `40th CTL meeting /2003
Question:
  g0 G) e; h6 m! rThe 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
- f8 Y% q/ s, a% Z" {2 N& vdue to a single fault condition (e.g. component failures, short circuit of functional insulation)
3 S1 t8 Q& L3 X4 ?  x, yan overload situation on a transformer is likely to occur, which approach should be
! x3 ~- C- G1 r7 rfollowed?
1) The actual overload on the transformer shall be performed, taking into account the 'characteristics' of
% L! A9 T2 A2 Y/ s) F" @1 Z/ Ceventual protective devices.
4 ^! F2 F1 x3 f# s- ~2) All possible single fault conditions shall be performed. For those situations where the protective
" k. z5 x3 }  F$ b+ |& Idevice reacts, the current through the protector shall be measured and the characteristic of the
7 I: U9 [( G0 U3 j# nprotector shall be taken into account.
3) No overload condition shall be created, since the standard does not specify this in wording.
4) Other possibilities.
: }1 s# k8 b) i8 eDecision:
% L' Y8 W0 b- t% R( }; Z; eFollowing the standard option 2 from above has to be used.
" I9 I$ o: P( o( r. e& J  R! c
8 _6 `/ ~& e  _4 g