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楼主: sky2214

[音视频产品] 是否所有类型的fuse炸开都算fail

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 楼主| 发表于 2011-8-21 22:36 | 显示全部楼层
广东安规检测
有限公司提供:
RATIONALE:
" @- {+ r- D/ _1 F* p, o2 \% b& q1 D
Generally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds
. _  a8 g4 l5 n+ r2 p" n4 B" j) d' Tthe breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3/ @# o1 L2 E( R( w
(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary* `  A0 H$ {" o5 X$ c9 t
Circuits, they should have high breaking capacity (1500 A) if the prospective short-circuit current; I0 k8 ^$ D/ A$ Y4 V
exceeds 35 A or 10 times the rated current of the fuse, whichever is greater.” (In the U.S. and/ R- s) l( D5 N2 a3 y
Canada, UL 248-14 fuses are indicated as appropriate alternative fuses per Annex P.2, and thus% [# _0 u( ]9 m' L/ R/ l
a similar consideration applies.) Typically, high breaking fuses are ceramic, not glass cased, and
2 k& u% z$ Z9 Q1 m; Tthe note is attempting to document that the breaking capacity of a fuse is a valid consideration
" D1 {: o; T. |# _4 A! @during performance testing.% Y& \2 p- s0 `5 e- }

) u. e6 H3 |' l+ M1 P7 D( CFurthermore, a bursting fuse can expel dead metal parts onto surrounding circuitry, potentially
) x3 M4 l5 g. w& l  k2 v$ obridging insulation and contributing to risk of fire or electric shock. Similarly, glass and metal
$ M$ H  }; H& W! L8 Hpieces can be expelled through nearby enclosure openings.
9 y) T1 u5 q* c5 @9 p1 E( p+ F
0 b  X- R( \1 g: Z) S9 gAlso, a bursting fuse terminating a test also is not a consistently repeatable result - during one
* M1 K; t* q7 x. a1 gapplication of a fault, the fuse may burst but none of the glass or metal may exit the unit or0 q8 }( Q1 i( |9 `
bridge live parts or insulation. With another application, it may not burst since the short circuit/ U, Z5 ~6 ^7 M% x" g  y
across a component was initiated during the zero crossing of the mains supply voltage. With1 x- n' \4 d) R. i& q- o
another application, the fuse may burst, expelling metal pieces that bridge live parts or critical
2 S! x" N; R, E! |0 |- {' x7 ainsulation.
2 u- b! ~, e0 X4 |
0 S# J9 P. t9 d9 E8 V. u6 ]A bursting fuse also is not an acceptable test result in either IEC or UL component fuse7 |; K: @7 ]8 [6 D* G) P
standards.
 楼主| 发表于 2011-8-21 22:45 | 显示全部楼层
之前只听人说保险管炸了不行,加套管也不可以,现在终于知道是那里规定的!/ ^  a  z' r: A$ e, d
感谢 Alexsong and ajay!!!!
发表于 2011-8-21 22:58 | 显示全部楼层
很想了解第三方认证机构有关故障测试的过程及评判依据,望高人解答,谢谢。
发表于 2011-8-21 23:28 | 显示全部楼层
不能设计成自动保护吗。
发表于 2011-8-22 09:10 | 显示全部楼层
我这里也刚刚发生一个这样的情况,加了套管,套管较短,保险丝还是脱落了,焊接面铜皮都烧没了
发表于 2011-8-22 10:47 | 显示全部楼层
引用第20楼sky2214于2011-08-21 22:36发表的  :
& u% t! ]6 L$ @1 FRATIONALE:. n, e' U3 ^' ^. ^

; m# [3 @0 R3 {1 K0 P9 zGenerally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds) i' S: L% Z& N. j: y& }: l
the breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3
- n2 ~) L7 x* W! f! `% H$ L(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary. L& K  A- A. }2 V
.......
+ q. o  X- m+ d# \* d7 L# Z; P' V

! S4 O+ c3 [6 a' G- }2 j% l* j, k$ s" w: I: x% a3 a; q/ O4 U5 e" p
, C* I2 F" a1 w" o9 b1 ]: @
我怎么在UL60950-1 PAG里面没找到?
发表于 2011-8-22 11:21 | 显示全部楼层
英语不好,只明白最后一句。有中文版吗?
 楼主| 发表于 2011-8-22 12:27 | 显示全部楼层
引用第25楼jinanny于2011-08-22 10:47发表的  :4 W% ^/ F" g5 b; ?0 x7 q

4 Z) Y0 L" B( R# r& D% h8 s: L' W% D0 c5 m; [$ @$ m! M% p
' r, Y3 M: [2 I  o) L: D

5 j  [3 Z0 o+ z9 A' v4 r4 ^" Z# x& ]+ R5 G
.......
, P3 s1 D2 _) \2 t
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