DSH 541 Transformer overload

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DSH 541 - u1 @' g) c5 E+ N; s9 M! S " I2 O4 ^+ b8 |5 j( w' n

Transformer overload # t: T  e7 o0 z5 D3 o" j

4.3, 11

60065(ed.6) / }4 [9 W% n6 `& [) m! I0 s: t7 k

Standard(s)-(year and edition):
IEC 60065 (1998) 6th Ed
2 h  }1 i4 T0 |8 M/ \1 V+ R( JSub clause(s):
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* B! d  D5 ?- T* r6 l- bDec. No.
DSH-541
8 s* Z: }& F3 W1 Z" }# I3 ~Subject:
( M6 x2 [1 K' U" O6 dTransformer overload
, @& i1 }1 f* ?1 z* d9 `Key words:
FAULT CONDITIONS
6 D( ^8 f' @6 v0 tDecision of:
40th CTL meeting /2003
Question:
& l# f5 [9 E1 m2 U4 i3 \% OThe standard does not specify a transformer overload test, as there is, , for example, in IEC 60950.,
* t2 P8 m( h" o( G) ^  P6 ~! eIf 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)
6 \; J& r% [; Z2 }6 Oan overload situation on a transformer is likely to occur, which approach should be
5 x3 \3 [. R- c0 Z" [followed?
1) The actual overload on the transformer shall be performed, taking into account the 'characteristics' of
eventual protective devices.
2) All possible single fault conditions shall be performed. For those situations where the protective
; G* _( `; J) h- |8 x. ldevice reacts, the current through the protector shall be measured and the characteristic of the
protector shall be taken into account.
* x! S& Z6 g3 P, }( l3) No overload condition shall be created, since the standard does not specify this in wording.
8 r; [& \' }- N" y( \9 N+ P4) Other possibilities.
. w& \" M% x* r/ j/ r. z3 \Decision:
& T1 u0 d$ E4 qFollowing the standard option 2 from above has to be used.

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