|
|
|  DSH 513
; F9 \: w5 F2 a, ^! y! Z# N
$ s3 _' x" V' W | Overload protection of transformers and associated circuits! G% q/ O, p* |- G; j8 K$ b+ [
| 173 c# i) N; j4 r6 `3 S
| 60335-1(ed.3); I4 Y! X4 I: z4 w6 h
|
; m- S( X) [! C( ?- ]: F/ D
Question:& Q) v7 ?: p9 j
1) In case of transformer mounted on an appliance, shall the short-circuit on the secondary% @) g$ }7 I/ h) v
winding always be carried out, if the transformer is not in compliance with specific standard/ d) F. P+ n* N- L
(e.g. IEC 60742)?
! V$ f4 Q# t) {2) If on the secondary winding a protection device like a fuse-link is connected, is it correct' ^0 ]' p3 t2 c1 p A
to introduce the short-circuit after the protection device?. y- b5 o* ]4 |: r* V6 c
Rationale:- Q9 V; `6 x& N4 \3 q4 W _6 K
See question.
! P" n1 F- Y2 K! g4 u9 FDecision:
x2 E5 T* p: \ E1 p1) No, the notes 1 and 2 of clause 17 have to be considered.
& \* t8 N3 D+ R3 I) O2 `2) Yes, if between the winding and the protection device there is no possibility of a shortcircuit
$ n( }, L( ~! `to occur.
3 }, D% R( o0 R, L9 Y
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发表于 2012-9-9 16:50
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