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|
|  DSH 5133 n7 X3 k% u. p" Z* E' t7 M& C
( D7 [' H; }4 N* R' b- y
| Overload protection of transformers and associated circuits7 G4 h: P! F1 ~
| 178 `# f6 P0 C+ ]2 K
| 60335-1(ed.3)
. w W1 G6 s& W: p |
5 I; h. S. E) @
Question:$ v- L* r$ Q6 `7 h$ h
1) In case of transformer mounted on an appliance, shall the short-circuit on the secondary0 a3 d K+ e6 D& g& o
winding always be carried out, if the transformer is not in compliance with specific standard) y; ]$ ]+ i7 H/ F+ v, w
(e.g. IEC 60742)?
5 e! A+ V0 ]) Y) Y5 \ u) c2) If on the secondary winding a protection device like a fuse-link is connected, is it correct
: A7 U1 R2 F# p, U5 R+ F4 mto introduce the short-circuit after the protection device?2 C, a2 ~2 O) Y, j+ p- W
Rationale:" v, j+ Q( ^8 F9 l W; J
See question.* M+ R1 v |, S: W' a
Decision:* k# y& m- P. y
1) No, the notes 1 and 2 of clause 17 have to be considered.1 l% g+ y1 h& I" o; `. v
2) Yes, if between the winding and the protection device there is no possibility of a shortcircuit
/ ?' U5 {7 @8 K6 kto occur.
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4 A: K7 s6 j6 f! V0 D v7 k
% ]/ x4 F3 E2 ~( n+ c |
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发表于 2012-9-9 16:50
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