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| DSH 541
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* v/ W9 p5 j6 O9 {( ^( G5 X0 t! @ | Transformer overload( N7 u2 U2 L, @9 p9 U& ]! X* p
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| 60065(ed.6)
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Standard(s)-(year and edition):/ I( K+ K8 m1 X$ S" y% L0 v
IEC 60065 (1998) 6th Ed! E2 c) z3 o/ H# L9 q
Sub clause(s):
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Dec. No.* y @ m! K# l6 V, L5 I
DSH-541
2 F& N4 Y0 v+ `2 y$ v8 P6 I$ \Subject:
! H4 Y3 }/ W8 a0 X# J6 Y' y5 T6 uTransformer overload
( R, ^- B! Z i) lKey words:
3 r! A# q9 j; x7 HFAULT CONDITIONS
0 }" }- F! p9 I. V+ ?4 {Decision of:
2 b' ]4 h/ B4 x1 K# X3 y. X40th CTL meeting /20039 y( ]6 k1 T" n1 F
Question:9 z( o% s. T9 \' |3 _2 R& y
The standard does not specify a transformer overload test, as there is, , for example, in IEC 60950.,
$ A( [) l l! r) D3 _. bIf it is obvious, based on engineering judgment of the technical design of the product, that' O' P e5 i6 F" h1 N
due to a single fault condition (e.g. component failures, short circuit of functional insulation)
7 Q$ w) o& `. Ian overload situation on a transformer is likely to occur, which approach should be
/ I' x6 X/ h2 J4 Z9 h8 T+ ~! U% {followed?
& [1 B6 Z( Q9 P& T3 k1) The actual overload on the transformer shall be performed, taking into account the 'characteristics' of
$ w8 r" Q& `- q8 P$ C/ B( Z. V! `/ }eventual protective devices.
3 F( g9 ^& z+ C& X2) All possible single fault conditions shall be performed. For those situations where the protective
* N* w7 f7 W7 A+ L, }device reacts, the current through the protector shall be measured and the characteristic of the. R$ V! M, g; G( g
protector shall be taken into account.5 B: P' I; m" D: T- `
3) No overload condition shall be created, since the standard does not specify this in wording.3 c5 F3 O6 B h2 U
4) Other possibilities. N9 a. x; _4 |! `+ \
Decision:2 c4 {) F3 h5 f/ d+ |+ ~: I, M1 O
Following the standard option 2 from above has to be used.
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