是否所有类型的fuse炸开都算fail

sky2214

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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
Canada, UL 248-14 fuses are indicated as appropriate alternative fuses per Annex P.2, and thus
a similar consideration applies.) Typically, high breaking fuses are ceramic, not glass cased, and
the note is attempting to document that the breaking capacity of a fuse is a valid consideration
during performance testing.
  c+ d+ M' I, H$ I! W
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.

2 `$ h' v( X7 G3 k) `* zAlso, a bursting fuse terminating a test also is not a consistently repeatable result - during one
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. With
another application, the fuse may burst, expelling metal pieces that bridge live parts or critical
5 O2 D% Y0 u: B4 zinsulation.

A bursting fuse also is not an acceptable test result in either IEC or UL component fuse
standards.

sky2214

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!!!!

badatong

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。

jxwyzg

不能设计成自动保护吗。

dz02941

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

jinanny

引用第20楼sky2214于2011-08-21 22:36发表的  :
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
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
我怎么在UL60950-1 PAG里面没找到？

vanedom

英语不好，只明白最后一句。有中文版吗？

sky2214

引用第25楼jinanny于2011-08-22 10:47发表的  :


  b2 G6 m" m* c- p
4 v8 j& q3 L' |' p% k7 S& D
+ n3 g6 V8 J! ?. n* z6 X8 ]& _
.......

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