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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 exceeds2 s" F! |' N$ k, h
the breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3% i' _( \# a% ^" Q# \- V
(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary& c) e' S8 }2 T/ o( T& @3 r2 p( @
Circuits, they should have high breaking capacity (1500 A) if the prospective short-circuit current
5 t9 x2 |8 }  `6 h" x  K$ Uexceeds 35 A or 10 times the rated current of the fuse, whichever is greater.” (In the U.S. and2 F/ m+ @. F% R1 F' s. C$ P0 M
Canada, UL 248-14 fuses are indicated as appropriate alternative fuses per Annex P.2, and thus
  s' ?0 W1 s- E; |, |, Ma similar consideration applies.) Typically, high breaking fuses are ceramic, not glass cased, and
$ T, A4 J: @8 G" Kthe note is attempting to document that the breaking capacity of a fuse is a valid consideration& b+ M' ^2 e% c6 n4 ?
during performance testing.0 i* z- ~1 D4 L) b

1 Z/ t* s: e. o, N4 VFurthermore, a bursting fuse can expel dead metal parts onto surrounding circuitry, potentially) T/ b+ k% J- ^+ @$ q! L; E4 F2 G- _
bridging insulation and contributing to risk of fire or electric shock. Similarly, glass and metal
5 O" W4 H' q: F/ ]2 Vpieces can be expelled through nearby enclosure openings.
3 M  T& p. n; ^  a
. o' d% f' ^5 r( uAlso, a bursting fuse terminating a test also is not a consistently repeatable result - during one
4 m8 X& v5 C+ n6 y9 [4 y7 eapplication of a fault, the fuse may burst but none of the glass or metal may exit the unit or" V) B8 [2 F1 l& X& h- t" x+ s
bridge live parts or insulation. With another application, it may not burst since the short circuit8 f( z. V0 V7 e; n5 M/ Z* X/ z
across a component was initiated during the zero crossing of the mains supply voltage. With/ l) F, z! Y& ^" `: Y% k1 W; y
another application, the fuse may burst, expelling metal pieces that bridge live parts or critical
7 j' L, ]$ D' u# V5 M4 W6 `insulation.
9 d; R  z2 p' `/ [7 B% S: O
/ q3 q' ^5 f" u2 F6 l! oA bursting fuse also is not an acceptable test result in either IEC or UL component fuse
$ U2 B9 ~3 B1 h) K# h/ k% G& hstandards.
 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!
" u6 G0 U$ ^7 e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  :( r5 h" A) x$ }: K5 \  P& N
RATIONALE:; l1 O1 ^/ H; _
( \. M  A) V: N# `8 C3 j6 s
Generally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds
3 A4 Q& k" T5 u4 x9 M( d7 |the breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3
# Q5 ~! A! z: g- Z* \0 y8 X(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary
) z* t5 P, Y- F" w: l5 a  J.......

; W' X! T) I, t* A/ L  u/ B& v! P$ M) T$ q6 z1 j1 d, e. ?  B: Y

/ @7 p' @! A. Y2 W) D* C/ Y0 }- F$ o$ q4 y  |& V
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  :" ^+ c- }! L  N" c2 T- H( v5 q

% n4 y9 n* D  p3 ~5 L: K5 |; Q- q0 H9 |; p; l, j: j, x0 l7 W

( G, R* k! `6 V2 u
+ V. y3 w  r6 @* o  r: M! [0 f+ r
9 c( d) t4 {, H.......
0 a# R/ C3 N/ y& f- {
page 301
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