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|  DSH 513
& X2 ?/ p; j2 M; r/ K& G m: B/ K, R" n# |4 C G
| Overload protection of transformers and associated circuits
8 p2 ?# Z6 M- c0 r+ I% U! w# Y+ g& Q | 17% b2 Z$ q& j! [2 F) R; ]
| 60335-1(ed.3)
+ k' u' m* {, d8 ^: A4 ? |
* j/ l( i9 ~9 c/ F [# T& PQuestion:8 Z' f6 P! ?% a
1) In case of transformer mounted on an appliance, shall the short-circuit on the secondary+ N: ? f( H! E6 ~% A
winding always be carried out, if the transformer is not in compliance with specific standard" y9 u7 `6 G; f7 I1 A; B- s9 ?
(e.g. IEC 60742)?
; ~4 d3 K2 r( n2) If on the secondary winding a protection device like a fuse-link is connected, is it correct9 ?, {1 S! \' H, v4 N
to introduce the short-circuit after the protection device?; X# Q& h. R! ~- }- h
Rationale:
& n+ B# ]3 {% I; BSee question.1 A6 v6 I0 M: ~* C) E9 j) J( i/ }1 R
Decision:0 G" s7 _4 ^ ~ e( t
1) No, the notes 1 and 2 of clause 17 have to be considered.
' D U8 t8 i% v) v% d7 o2) Yes, if between the winding and the protection device there is no possibility of a shortcircuit$ Q2 x2 L* m' y) t- i
to occur.! B& [: A" C) B: k
1 o. e O8 ~$ W' W6 }2 w
9 F0 ^$ q) E+ u- D, C |
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发表于 2012-9-9 16:50
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