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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:* M  ~' i2 p9 P& p6 W
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Generally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds8 A9 E8 ]! r% J4 g( o& Q
the breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3
7 b5 F5 O6 N  W" |% [  @' V( Q(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary
+ a. v( g- u2 D& ^9 |2 j1 T  OCircuits, they should have high breaking capacity (1500 A) if the prospective short-circuit current
: O2 w. ]0 k! E/ h8 z; Eexceeds 35 A or 10 times the rated current of the fuse, whichever is greater.” (In the U.S. and7 I) ]9 y, W! x3 t; `: ^
Canada, UL 248-14 fuses are indicated as appropriate alternative fuses per Annex P.2, and thus! o/ I( J# B9 \1 C( `
a similar consideration applies.) Typically, high breaking fuses are ceramic, not glass cased, and1 V# r7 u# ~  W/ Q, X. |
the note is attempting to document that the breaking capacity of a fuse is a valid consideration. f, [  v+ S8 I, w* D+ _
during performance testing.: t0 s- R& c* r! l
  n3 W+ K1 E( o6 S0 ^
Furthermore, a bursting fuse can expel dead metal parts onto surrounding circuitry, potentially
; U) B. a  c# K2 h) Ybridging insulation and contributing to risk of fire or electric shock. Similarly, glass and metal
  x2 B) `, c% C9 e4 c9 b) Bpieces can be expelled through nearby enclosure openings.8 \4 j- o" O" Z2 X/ R" P" D4 D
+ N9 V$ _1 }3 A2 b1 T2 E
Also, a bursting fuse terminating a test also is not a consistently repeatable result - during one
9 Q9 A/ [5 ~1 C: k( \5 Lapplication of a fault, the fuse may burst but none of the glass or metal may exit the unit or
7 S. ?3 [0 B2 ]* G- v7 ~$ Ubridge live parts or insulation. With another application, it may not burst since the short circuit
6 B/ X( W# y. U( @- p2 j( V7 a: hacross a component was initiated during the zero crossing of the mains supply voltage. With
, h% f8 a5 c2 n! Qanother application, the fuse may burst, expelling metal pieces that bridge live parts or critical2 z2 [8 L4 N- m3 }% e! I2 _5 U
insulation.
( q2 [  I: U, _. }% A* o) W, z' y$ ^% b+ ^  c1 t# Y
A bursting fuse also is not an acceptable test result in either IEC or UL component fuse
  K: `) q4 s9 P" [& M# K8 k1 ustandards.
 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!2 n1 [' T# P5 X/ X
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  :
$ v( M8 o" e' H8 x3 j' FRATIONALE:
# o( y4 O0 m( D1 P  h9 }
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
.......

5 f, x# W! l6 k8 M& N+ K
- v# F. `- K3 s5 r* W' l4 e* D  c( u" s: A9 N
& \0 n0 K! ]9 T9 w$ L# p
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  :
2 X9 G7 l7 u* g+ M8 _
" z6 Z2 |3 x  y$ U. Y8 u3 I/ B0 Q! d" c' v4 [/ d& ^
# q9 S/ d" E9 W+ n1 |$ Y/ t

  y3 q8 R  S2 f: Q) h
0 J3 d+ u; r& T+ O2 Y; ].......

5 r; R1 b* v+ n' ?( v3 Ypage 301
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