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|  DSH 513
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5 n1 e$ n) e; n+ w | Overload protection of transformers and associated circuits
5 k- V) T! v5 O$ X; ]7 s | 17
' {7 O' b- s% P$ B- l( k | 60335-1(ed.3)1 I) w" w/ c- P. Y( K1 n& _
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( a. o1 C+ V) r E0 @% |Question:$ J8 C3 l/ r6 s8 m) ~3 |: }; _
1) In case of transformer mounted on an appliance, shall the short-circuit on the secondary2 W! M8 a/ {( v% @/ _6 j
winding always be carried out, if the transformer is not in compliance with specific standard
$ W1 d; V1 j# o" N$ E(e.g. IEC 60742)?
9 v4 e& Y g& C# V! @! ]2) If on the secondary winding a protection device like a fuse-link is connected, is it correct
% i" N$ s2 T8 I7 I; pto introduce the short-circuit after the protection device?6 [! U2 Z& r" o; i1 I% x
Rationale:7 ]9 u& D4 d1 }! t2 ^7 Y+ ?$ S3 C7 G
See question.- J& u2 [% @: u- n" n0 g8 N1 n
Decision:
- @ w; t4 a) ~1) No, the notes 1 and 2 of clause 17 have to be considered.3 {8 r {5 u6 {- ?
2) Yes, if between the winding and the protection device there is no possibility of a shortcircuit. ?" R5 q0 p2 y5 S8 n2 w
to occur.
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发表于 2012-9-9 16:50
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