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0 `( X2 a3 T1 c9 F k, y9 CStandard(s)-(year and edition):
& u7 g6 A* Q3 ~1 WIEC 60065 (1998) 6th Ed
0 F( K" V8 Y6 `1 J+ U# dSub clause(s):8 A) J% j5 d: e/ _" j/ C- e+ j/ Z
4.3, 11
/ D' p- L2 C- N: aDec. No.) c+ l; z0 a* [( e& Y; ]2 `1 L
DSH-541
" q: M' H6 H; d# A# h: eSubject:
, ?3 ]* _+ s5 DTransformer overload7 @/ w" a4 D- ~8 d7 u6 K8 N) M b
Key words:
$ U8 K5 t9 _ gFAULT CONDITIONS& T s/ d9 G5 q% f8 s) J
Decision of:
* q3 c; W& R. Q40th CTL meeting /2003
+ ^" z+ ^, A+ p( c8 O2 ?/ h& p7 `Question:
% z. J0 h/ t3 E1 K% y/ mThe standard does not specify a transformer overload test, as there is, , for example, in IEC 60950.,
) R' q8 G+ K8 T7 t) I: F* x: M" _5 lIf it is obvious, based on engineering judgment of the technical design of the product, that
- Q2 }4 ]6 m9 y- Edue to a single fault condition (e.g. component failures, short circuit of functional insulation)
3 {/ A3 k4 D3 u/ y2 g; k! u& |- Uan overload situation on a transformer is likely to occur, which approach should be2 u1 Y, A4 ?, @: U3 \6 }& w
followed?
* C: M* b- Q, u1) The actual overload on the transformer shall be performed, taking into account the 'characteristics' of) t9 D, q5 u& d1 I/ e7 _
eventual protective devices.
2 x4 d e3 I0 Q* j2) All possible single fault conditions shall be performed. For those situations where the protective4 R2 u. o& A. N3 x9 O1 r$ ]
device reacts, the current through the protector shall be measured and the characteristic of the* x2 ]) X- u' {+ P
protector shall be taken into account.
: f* W+ W1 K* `% ]3 [3) No overload condition shall be created, since the standard does not specify this in wording.
5 K6 k& [$ B8 l4 t w! g4) Other possibilities.
# c3 N4 t: d! B. y3 h3 P, m. P9 y( kDecision:- T3 H( w3 X2 Q3 V& I
Following the standard option 2 from above has to be used.' @9 v H# a1 u
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