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|  DSH 541
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| Transformer overload
6 Y0 X. j5 L$ a7 v% o) T3 G1 n9 A | 4.3, 11
5 o( W+ `/ Q! S( L3 ~ | 60065(ed.6)
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Standard(s)-(year and edition):
# b q. f* N+ S6 iIEC 60065 (1998) 6th Ed- U+ y( W. m3 G1 O
Sub clause(s):' {$ r* ]. }" X- O- ?
4.3, 112 }$ `- P* D* w2 G7 l
Dec. No.1 _& T- d' Q) r8 b3 x
DSH-541
3 t a O' Z3 A* {Subject:
8 x: m0 R q# E7 f' ETransformer overload
) O, f6 [. q$ s) n. Z+ UKey words:
( B j' F: i5 }7 w x- _0 jFAULT CONDITIONS8 n: b0 I$ Q* N; p) T
Decision of:
+ \' d. K4 u5 v) g( c, Z# @40th CTL meeting /2003
5 V1 O7 F- H" [* c/ F+ s# W+ X( NQuestion:
y$ s" [6 I* ?1 H$ {% _, ?& _2 ~The standard does not specify a transformer overload test, as there is, , for example, in IEC 60950.,* w' p1 x* f$ J& ^8 k9 M
If it is obvious, based on engineering judgment of the technical design of the product, that
1 e, H: ]2 N* j8 r6 a/ w! u; Y: o E' {due to a single fault condition (e.g. component failures, short circuit of functional insulation)$ ~# v% o4 {- y, H! W) k* f+ S5 X9 x
an overload situation on a transformer is likely to occur, which approach should be
4 R9 A+ o9 W7 d: dfollowed?6 x0 Z6 m8 f1 h. N7 i& }
1) The actual overload on the transformer shall be performed, taking into account the 'characteristics' of q0 R: U( F* ^8 R9 ~
eventual protective devices.3 K% M9 N# n2 t1 x9 H: a! {
2) All possible single fault conditions shall be performed. For those situations where the protective
( u) k9 m: O G. C! L; {9 e5 @device reacts, the current through the protector shall be measured and the characteristic of the
4 I W# `, I/ w% t: A, z6 t% Hprotector shall be taken into account.
2 ]: _5 e* K5 r8 x6 [; C* T3) No overload condition shall be created, since the standard does not specify this in wording.
# v4 p- ?0 t+ ^! w4) Other possibilities.. M3 o7 f# G. D; G
Decision:
- {8 f. E/ \* y Y) dFollowing the standard option 2 from above has to be used.
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