DSH 541 Transformer overload

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DSH 541 " G+ I4 @' \7 f7 M; s3 w! f: \) K' d: T 4 X0 r1 R0 R5 G0 y3 p. h

Transformer overload

4.3, 11

60065(ed.6)

+ w* l# U" a2 [' @Standard(s)-(year and edition):
IEC 60065 (1998) 6th Ed
Sub clause(s):
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; W& X6 O3 h. j# mDec. No.
DSH-541
Subject:
# X  R: m7 J. d8 }Transformer overload
4 W+ W+ \( a( f6 ^9 Q  xKey words:
  P/ }, j* P2 r  V0 g6 iFAULT CONDITIONS
2 W9 x# [* z" \/ R& qDecision of:
. f' @" j- J; v% Q40th CTL meeting /2003
Question:
! d, r* x2 I+ ~3 b8 ZThe standard does not specify a transformer overload test, as there is, , for example, in IEC 60950.,
( m  w+ y; G+ K3 d4 f8 iIf it is obvious, based on engineering judgment of the technical design of the product, that
& F$ R: k, l, o1 d3 g* v+ Ldue to a single fault condition (e.g. component failures, short circuit of functional insulation)
an overload situation on a transformer is likely to occur, which approach should be
followed?
' r2 i) D( n; A) G8 |# P1) The actual overload on the transformer shall be performed, taking into account the 'characteristics' of
$ R1 X- k6 G0 y% geventual protective devices.
2) All possible single fault conditions shall be performed. For those situations where the protective
+ o- y: {" V9 m: J/ cdevice reacts, the current through the protector shall be measured and the characteristic of the
protector shall be taken into account.
3) No overload condition shall be created, since the standard does not specify this in wording.
  g5 j9 d0 f6 _6 N, n( D9 D  n4) Other possibilities.
Decision:
Following the standard option 2 from above has to be used.
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