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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:) K* D/ u) w0 W$ ~& j+ w( k
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Generally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds
' i( x3 \1 ?7 z1 vthe breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3! g3 w. i' t$ e/ U! Y6 m
(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary9 k- |0 L' E& a+ U) G! N. j
Circuits, they should have high breaking capacity (1500 A) if the prospective short-circuit current2 b3 x3 \: j( n# W( |- F% i4 P
exceeds 35 A or 10 times the rated current of the fuse, whichever is greater.” (In the U.S. and
9 J* B- f% G8 j/ K8 }2 xCanada, UL 248-14 fuses are indicated as appropriate alternative fuses per Annex P.2, and thus, G3 f% o% s' j! ]
a similar consideration applies.) Typically, high breaking fuses are ceramic, not glass cased, and
7 Y% d7 o' a! v9 y0 B" lthe note is attempting to document that the breaking capacity of a fuse is a valid consideration
7 x6 n  d% ]# A) k2 @5 Z1 q. I, dduring performance testing.6 k4 H! F5 b6 `! }: T! L
' i  X' T1 b/ G# T( u' E( ~! r
Furthermore, a bursting fuse can expel dead metal parts onto surrounding circuitry, potentially
* D! m( l$ O0 E% H8 h  Hbridging insulation and contributing to risk of fire or electric shock. Similarly, glass and metal3 z- k! U0 \  u$ E6 X- f
pieces can be expelled through nearby enclosure openings.
2 `0 E+ o1 u. q/ u! @* G: K7 p/ f3 f* P) K2 W7 @7 C
Also, a bursting fuse terminating a test also is not a consistently repeatable result - during one; g0 y$ d6 g9 {- y, `4 F
application of a fault, the fuse may burst but none of the glass or metal may exit the unit or6 p, n: F* \4 f4 C+ N' S
bridge live parts or insulation. With another application, it may not burst since the short circuit
# V( W/ A4 _( t+ X6 kacross a component was initiated during the zero crossing of the mains supply voltage. With' X$ o2 u/ R7 U7 N) l/ U$ g
another application, the fuse may burst, expelling metal pieces that bridge live parts or critical- \; j8 T. u+ T* G8 X6 ?3 S
insulation.
- \3 o2 ]  Y# [0 m4 a1 V
. M( {' R0 E0 Z$ ^9 W2 ~, pA bursting fuse also is not an acceptable test result in either IEC or UL component fuse
9 g7 C2 H4 D1 y0 B& ~% U0 j$ c3 vstandards.
 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!
4 l  w9 Y/ ~/ I, D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  :. I7 _" x$ N& d$ Z# y
RATIONALE:# ]3 D6 S+ |. h* S$ _
" w' |9 q; a3 E4 S
Generally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds& ^* h' ]& p: g- }5 A5 I9 I: F' D3 F
the breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3
+ D+ S1 [1 }( v$ |6 w(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary
/ i* l; O5 y  x' b. U.......

5 R  {6 Q, P- n6 v; e1 E
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/ W( f+ w6 w3 i+ P$ B# d( Y9 u5 L# m% J) U% y) V7 `# I
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  :
+ S1 H3 X; X2 x) ^% x
8 e" j1 A2 P4 x# q2 t9 b3 B3 e6 V7 L& O/ I) y; A7 P

- V& L: v1 K7 c- X& i, n3 d- u+ k* f4 h+ S2 Z
. @$ ]( I4 J7 U$ h$ l9 r
.......
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page 301
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