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[TRON] DSH 541 Transformer overload

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发表于 2012-11-8 18:30 | 显示全部楼层 |阅读模式
广东安规检测
有限公司提供:
DSH 541
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Transformer overload
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4.3, 11; `# y0 C8 R& i( j, U% o9 K' }
60065(ed.6)
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Standard(s)-(year and edition):
7 u1 x' _" p& _IEC 60065 (1998) 6th Ed
0 G  [7 h# h0 F5 c6 @Sub clause(s):
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Dec. No.
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Subject:* [' K, R- Q+ r! U  X! I$ }7 a
Transformer overload
) S. a3 x; t+ C8 q; Y4 s  b! RKey words:: d' Y" x- A& d' h* X6 z
FAULT CONDITIONS' t# R( q3 u, ~: o2 y' ?+ h3 a
Decision of:
- ^. Y/ D6 g% ?9 \2 {40th CTL meeting /2003% U, K5 b$ F7 X
Question:; O% V5 X) u5 Y
The standard does not specify a transformer overload test, as there is, , for example, in IEC 60950.,) u. L" @3 I7 \4 v# h# }1 V
If it is obvious, based on engineering judgment of the technical design of the product, that5 r$ l6 W# i9 e- \- f$ F: N8 Q
due to a single fault condition (e.g. component failures, short circuit of functional insulation)
. P' E8 P) z: J& x: ?, Ian overload situation on a transformer is likely to occur, which approach should be
- y8 \) [- r0 C5 m; k: A  S5 k- Tfollowed?9 l5 z; g9 A! L
1) The actual overload on the transformer shall be performed, taking into account the 'characteristics' of2 m' V  u$ n0 ]) n( E
eventual protective devices.& ^1 f2 U! G1 Q( u4 k6 a1 m
2) All possible single fault conditions shall be performed. For those situations where the protective! Z2 s) y' p0 V" Q2 E+ v
device reacts, the current through the protector shall be measured and the characteristic of the9 p7 }0 k. ?9 a. f. e0 `
protector shall be taken into account.
, v! L0 h3 m6 J4 M: o3) No overload condition shall be created, since the standard does not specify this in wording.
% x3 Q9 u5 b/ q4) Other possibilities.
, t; C& @" _3 ]6 B+ e+ {Decision:
8 j: W( G: G! YFollowing the standard option 2 from above has to be used.
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