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|  DSH 5133 U! k0 B6 Q) P& X, E0 m: Y
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| Overload protection of transformers and associated circuits
$ A/ O8 a) j5 U3 k& G | 17" n; b* f4 t- l& A% y) @
| 60335-1(ed.3)
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1 C0 e* w6 q! `! A! pQuestion:
" R$ z6 ^* U" ~) f1) In case of transformer mounted on an appliance, shall the short-circuit on the secondary9 A8 w* z, t" n n9 b3 L/ Z
winding always be carried out, if the transformer is not in compliance with specific standard# t$ V4 n7 u w+ L
(e.g. IEC 60742)?
$ b7 F- H7 {' t& r+ P" n/ J' I+ h2) If on the secondary winding a protection device like a fuse-link is connected, is it correct
" Q7 I% n8 K# b Pto introduce the short-circuit after the protection device?# ^) [3 _. t3 z5 j5 r% g8 O
Rationale:
: v I2 f! x& h; CSee question.
& y4 W% Y( p% L/ {/ p' A" \Decision:5 y% N! I7 W/ S5 Q+ x7 H5 u5 W
1) No, the notes 1 and 2 of clause 17 have to be considered.5 j7 T3 n8 P" m2 q6 R+ J/ P
2) Yes, if between the winding and the protection device there is no possibility of a shortcircuit1 h* d# V! J4 q7 P% C
to occur.7 Z) o( T* ]! o
q; l/ {, W: F+ o1 i# |* w; R8 P: v
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发表于 2012-9-9 16:50
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