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|  DSH 5136 ]$ v Z. w2 b5 y7 z
3 Z( y3 V# K8 d" c
| Overload protection of transformers and associated circuits
9 l% U5 r7 S) L3 l8 j | 17
( `1 H6 n3 U0 P | 60335-1(ed.3)0 q$ [' M' V, _5 \7 P
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" k" J$ n {5 O8 ^% iQuestion:
/ V" B, P+ y7 D) X1) In case of transformer mounted on an appliance, shall the short-circuit on the secondary
6 m! P4 z; b. c' dwinding always be carried out, if the transformer is not in compliance with specific standard
6 v B' a' W+ T/ \0 n8 s" Q) b(e.g. IEC 60742)?: ?* f- K* ?7 V) F/ C& z
2) If on the secondary winding a protection device like a fuse-link is connected, is it correct
. {9 @. w% f: c9 F' V/ Dto introduce the short-circuit after the protection device?
( \+ F7 R1 V/ s9 P4 }7 ZRationale:8 n0 |" Z$ l3 T( `% t( g3 V
See question.
- T3 g, s* g l' m* s7 E+ N6 }Decision:
5 X; M1 d% e7 h2 h1) No, the notes 1 and 2 of clause 17 have to be considered.; E0 E% ]6 a. A. \# V
2) Yes, if between the winding and the protection device there is no possibility of a shortcircuit
; X8 a" Z/ ?: v* S+ j+ \: yto occur./ r% }# ?, {; X+ Q9 P1 M1 e2 ^. q
4 P/ X0 y, W8 |: ]; ~
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发表于 2012-9-9 16:50
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