是否所有类型的fuse炸开都算fail

sky2214 · 发表于 2011-8-21 22:36

RATIONALE:

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
(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary
Circuits, they should have high breaking capacity (1500 A) if the prospective short-circuit current
exceeds 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.

Furthermore, a bursting fuse can expel dead metal parts onto surrounding circuitry, potentially
bridging insulation and contributing to risk of fire or electric shock. Similarly, glass and metal
pieces can be expelled through nearby enclosure openings.

Also, 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
bridge live parts or insulation. With another application, it may not burst since the short circuit
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
insulation.

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

sky2214 · 发表于 2011-8-21 22:45

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！
感谢 Alexsong and ajay!!!!

badatong · 发表于 2011-8-21 22:58

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 · 发表于 2011-8-21 23:28

不能设计成自动保护吗。

dz02941 · 发表于 2011-8-22 09:10

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 · 发表于 2011-8-22 10:47

引用第20楼sky2214于2011-08-21 22:36发表的  :
$ v( M8 o" e' H8 x3 j' FRATIONALE:
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9 [% K6 d1 S3 P1 bGenerally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds6 @, p4 \9 J6 U' I1 g( N) l/ [
the breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3, @8 ~. _+ |& J
(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary9 p6 C4 Q: w  A: T, ]0 x
.......

我怎么在UL60950-1 PAG里面没找到？

vanedom · 发表于 2011-8-22 11:21

英语不好，只明白最后一句。有中文版吗？

sky2214 · 发表于 2011-8-22 12:27

引用第25楼jinanny于2011-08-22 10:47发表的  :
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