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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:4 L0 v8 O+ |# S6 P! H+ _9 V' q
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Generally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds2 J* l0 {8 L' u5 ~( ~, k
the breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3
+ S% e( P$ G5 z3 f  b* |(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary( D5 U" ?) P$ x. q7 H( P
Circuits, they should have high breaking capacity (1500 A) if the prospective short-circuit current$ e! j: T  N/ ^( H/ Z" |  v
exceeds 35 A or 10 times the rated current of the fuse, whichever is greater.” (In the U.S. and: \  J5 a* z/ k8 A* y
Canada, UL 248-14 fuses are indicated as appropriate alternative fuses per Annex P.2, and thus
/ b5 j5 x" |+ l1 G( p' y6 B* aa similar consideration applies.) Typically, high breaking fuses are ceramic, not glass cased, and
1 A$ \: X+ f/ w3 o7 k+ n; i3 mthe note is attempting to document that the breaking capacity of a fuse is a valid consideration
% {) C3 i7 p" U. [( v# O5 xduring performance testing.
2 q% O5 I8 J# Y& ]- n8 `3 C1 N, N& \& x6 f0 x
Furthermore, a bursting fuse can expel dead metal parts onto surrounding circuitry, potentially' C. p. d& e& T' f- S# {
bridging insulation and contributing to risk of fire or electric shock. Similarly, glass and metal
, v$ |1 e- g# ?6 V$ f) |pieces can be expelled through nearby enclosure openings.
6 U+ P# }/ d7 s* [  i; N) \0 z; L  _$ [+ [6 Y, t9 b! O
Also, a bursting fuse terminating a test also is not a consistently repeatable result - during one
; |" m4 b. `$ E/ _application of a fault, the fuse may burst but none of the glass or metal may exit the unit or8 ~3 V0 h5 ]9 c( _  W: f
bridge live parts or insulation. With another application, it may not burst since the short circuit: w: S4 c$ q6 j2 ^
across a component was initiated during the zero crossing of the mains supply voltage. With
4 Q; _8 T/ _1 D$ h+ _! lanother application, the fuse may burst, expelling metal pieces that bridge live parts or critical
5 _/ K. c; Q( X1 u/ E1 |5 T% \insulation.% L+ `4 d1 m& `- y0 N" I) a* ^
: Q' t& W; ~2 r* t! m
A bursting fuse also is not an acceptable test result in either IEC or UL component fuse* f  J; I# I1 p3 t2 y9 c
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!1 z/ T8 p& W0 Q  p1 \* Z/ V
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  :. B2 q3 t$ L2 @1 o
RATIONALE:: ]$ n/ e. t6 J& f$ K

+ r$ w1 w9 R! |& [Generally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds
" a" X" G/ }; Fthe breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3
9 x0 {, z9 {7 w$ r* |6 N5 |7 }(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary
: h1 o5 W7 n, R" \9 A  n.......

6 _- N2 D: p4 [- _7 v! t
4 {3 `1 G) V8 ~& n4 r. y$ j' A8 B. `* D7 u

1 _0 L. o3 f' O/ Q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  :* O  v2 _0 `# ]
/ \6 X, f) G, w$ _/ f0 h) @
9 m, i+ U" Y# J" G5 ?# F4 d5 Z
+ r1 o% [, G# m# H& W3 y2 R/ x' ^9 D
6 p3 _7 v/ s, n

7 C) ?3 M7 P1 l.......

+ |% S& t. n" rpage 301
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