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|  DSH 513
7 K( @, E6 o. E+ ^& r0 G$ I* B+ H% x1 q! \) q: G: p' h+ d" T
| Overload protection of transformers and associated circuits
0 ?4 ]- A- T2 v0 B# m3 |; n | 17* G1 m( E* O% X5 U
| 60335-1(ed.3)/ n7 b' a% _+ L1 G+ ?; Q
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( s& ]# q: C: v- c9 eQuestion:; \: e; f4 D$ b$ T# X0 a7 I
1) In case of transformer mounted on an appliance, shall the short-circuit on the secondary
. S0 Q2 x% N4 X& t' Zwinding always be carried out, if the transformer is not in compliance with specific standard; J8 d4 f9 C/ z! C$ j
(e.g. IEC 60742)?! W" A6 s# ]1 X5 C( x0 M
2) If on the secondary winding a protection device like a fuse-link is connected, is it correct! h! s L1 q" p+ z/ h
to introduce the short-circuit after the protection device?
5 D9 d: W. q% _9 Z* m' |$ K( F0 J4 fRationale:# |1 K. J$ |3 S
See question.9 T b1 K p+ M0 L0 f
Decision:
: ~ b0 y7 p9 G# l: [6 d1) No, the notes 1 and 2 of clause 17 have to be considered.
9 j, f4 F# b6 g: ?3 W# r' u2) Yes, if between the winding and the protection device there is no possibility of a shortcircuit2 m& ]) x' n( I5 Q) a5 L
to occur.+ s! [$ Q# B# g$ X
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发表于 2012-9-9 16:50
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