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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:
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Generally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds
( n; [9 c! q1 v$ \: hthe breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3
* w# C6 ^9 n6 R1 [1 E(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary
* f8 |) W: a& Z& K# FCircuits, they should have high breaking capacity (1500 A) if the prospective short-circuit current
; E7 c8 K2 ^7 |( u7 \0 zexceeds 35 A or 10 times the rated current of the fuse, whichever is greater.” (In the U.S. and. p8 T1 R& O3 S' y0 f
Canada, UL 248-14 fuses are indicated as appropriate alternative fuses per Annex P.2, and thus; _& i' {  I; f5 f& G
a similar consideration applies.) Typically, high breaking fuses are ceramic, not glass cased, and' N0 c* u7 N8 U( M  w% f
the note is attempting to document that the breaking capacity of a fuse is a valid consideration1 @7 C; }8 R5 r' k' r4 p! t
during performance testing.
  c+ d+ M' I, H$ I! W: Y% s5 z# v# P/ T
Furthermore, a bursting fuse can expel dead metal parts onto surrounding circuitry, potentially
, }  z" n4 v2 w1 s# ]; I) ~bridging insulation and contributing to risk of fire or electric shock. Similarly, glass and metal
8 }4 z, C) E; Upieces can be expelled through nearby enclosure openings.# d, \4 D* ~7 e! A1 P+ H

2 `$ h' v( X7 G3 k) `* zAlso, a bursting fuse terminating a test also is not a consistently repeatable result - during one- }1 s5 a8 v2 F" I- R( N% g
application of a fault, the fuse may burst but none of the glass or metal may exit the unit or
8 l, k( }( U. n5 Nbridge live parts or insulation. With another application, it may not burst since the short circuit
* ~/ V/ e$ l9 T/ z0 q  I5 v& @across a component was initiated during the zero crossing of the mains supply voltage. With1 \( Q+ f% j1 A; q2 c1 [6 j
another application, the fuse may burst, expelling metal pieces that bridge live parts or critical
5 O2 D% Y0 u: B4 zinsulation.0 v- w/ _, C" h. N6 t9 W$ t
, D+ r# l4 n) c& f+ L) D9 m
A bursting fuse also is not an acceptable test result in either IEC or UL component fuse. E$ z5 B8 g9 M( y+ V
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!
3 |% b/ d3 I5 F* x/ N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  :2 y( [! U& ]  ^+ Y" z! q
RATIONALE:
2 C% a6 h6 D" X; \: K9 C
; [5 `) X* V$ P% _Generally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds, j; p7 c, @! Q8 m, L8 {
the breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3
' q5 r' |# |( m% W(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary
% }) \2 D( z1 L0 V3 V( O.......

& {+ G, [8 Z* u; h* ^1 A
) |, h; n" T- i; s9 z6 m  L& t
% ~5 b8 J" b& W4 J! |4 v* R$ M# h8 v4 p4 H  v0 c
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  :- w- Z( O/ {( h9 r# m# g
3 `) N+ r7 R# D/ F/ K! i- M

  b2 G6 m" m* c- p
4 v8 j& q3 L' |' p% k7 S& D
+ n3 g6 V8 J! ?. n* z6 X8 ]& _4 d9 h  f; s5 e, l
.......

2 P& r) D0 L' l7 P) Kpage 301
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