DSH 541 Transformer overload

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DSH 541 ) L" E( d% ~) Y

Transformer overload   g: q9 o  l  e3 A& u4 q2 R  Q

4.3, 11 5 }- H0 a5 L& g, L7 F7 Y

60065(ed.6) 8 b$ _' i# F' u+ _+ r

! S3 s+ K' z2 B2 J% X3 U* w( zStandard(s)-(year and edition):
6 T3 y8 e; [# `4 xIEC 60065 (1998) 6th Ed
Sub clause(s):
4.3, 11
Dec. No.
DSH-541
Subject:
+ C) _$ k6 J; D4 j: K6 U5 }. P# p9 OTransformer overload
0 O  u1 Q8 B& D8 sKey words:
6 u: Z1 s/ i$ OFAULT CONDITIONS
6 x; ~& Q. G* Y$ H4 G& H2 DDecision of:
40th CTL meeting /2003
5 B5 W# w" ^/ z7 w; L2 c% VQuestion:
6 A# H7 Y+ r1 U4 g7 XThe standard does not specify a transformer overload test, as there is, , for example, in IEC 60950.,
& {0 L( p( @* qIf 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)
. S9 L- \1 n& D9 q: f! Y$ `an overload situation on a transformer is likely to occur, which approach should be
4 }+ ^- d% d5 f" S+ s9 w5 f3 cfollowed?
  d! F4 H! ?, ~) A$ m# P1) The actual overload on the transformer shall be performed, taking into account the 'characteristics' of
( n$ p" l  ~+ Meventual protective devices.
0 e: m: S/ j6 d8 C0 U2) All possible single fault conditions shall be performed. For those situations where the protective
* Y# f( K1 D9 }2 Q! udevice reacts, the current through the protector shall be measured and the characteristic of the
) F4 \2 b  D7 Wprotector shall be taken into account.
0 H. K% l" g3 K3) No overload condition shall be created, since the standard does not specify this in wording.
) U6 {0 w/ b6 f  l- M8 Z& z4) Other possibilities.
  o# }0 D/ q% M9 t. N; ~5 @Decision:
& g2 d* i/ y% {, ^/ h3 gFollowing the standard option 2 from above has to be used.
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