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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:
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Generally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds4 M+ ]1 ?, g6 x; W6 x. o$ F
the breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3
0 l/ a# }; U5 A7 _1 O# |( j(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary
7 w' ?' V1 H  x6 }0 n* c4 N9 iCircuits, they should have high breaking capacity (1500 A) if the prospective short-circuit current
5 F1 Z( u8 H- Y0 Iexceeds 35 A or 10 times the rated current of the fuse, whichever is greater.” (In the U.S. and1 r/ A& y, S5 ^9 T4 F* u
Canada, UL 248-14 fuses are indicated as appropriate alternative fuses per Annex P.2, and thus6 b# y& B8 ~5 U
a similar consideration applies.) Typically, high breaking fuses are ceramic, not glass cased, and
, |; ^1 Q' U( z, X, Uthe note is attempting to document that the breaking capacity of a fuse is a valid consideration, G3 k; w( ~! K5 {9 S
during performance testing.' A- d3 x4 d3 q* o

3 h: e, E* Q6 ^% u+ ~' x) g1 zFurthermore, a bursting fuse can expel dead metal parts onto surrounding circuitry, potentially( x! \4 H# }, N" N. R# X
bridging insulation and contributing to risk of fire or electric shock. Similarly, glass and metal
5 n! d) k/ l/ H2 n! |( @. Q8 r) Bpieces can be expelled through nearby enclosure openings.
2 m& `7 k# A: {' F5 s
" H; a8 C, e  rAlso, a bursting fuse terminating a test also is not a consistently repeatable result - during one2 }4 ^. [4 z. i) X$ |; q4 |
application of a fault, the fuse may burst but none of the glass or metal may exit the unit or! e, [7 ~+ i$ V" r, O: D
bridge live parts or insulation. With another application, it may not burst since the short circuit
, x2 x& Q! f: G' w" Zacross a component was initiated during the zero crossing of the mains supply voltage. With5 @$ y- `: I) N- d$ g' f
another application, the fuse may burst, expelling metal pieces that bridge live parts or critical1 P* W9 v$ _8 i
insulation.( L  G0 {6 D1 o5 Q" y

1 v) z/ j& d9 y1 o0 z9 Q4 u; HA bursting fuse also is not an acceptable test result in either IEC or UL component fuse
# K' G4 m1 P; L! j2 d8 qstandards.
 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!
9 ~- n8 B4 n6 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  :
) {* ^# \; c# c5 K9 PRATIONALE:; _- @2 q( W  I: r/ q5 A

. L- i4 |% r! O$ @  y3 r$ S( Y9 m2 EGenerally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds$ c: @$ p6 a2 c
the breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3/ \- T8 n) V4 t8 P3 }& X
(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary
# U+ j4 z0 d8 {, o- t0 l.......

6 `: Y5 [( k3 [& {# A) v: _& N8 ]! t9 ~6 j6 g2 m: e% R  M5 W

1 P: i) u  \6 K% x% P, ^4 n. i' A9 W; m) y0 |$ B( I! 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  :0 M% s! H; n4 Y3 R  L& l

1 i. X* B4 \( U2 Z
2 M" s) `; x! d1 c8 y. m- q  \+ J6 v# ?" G+ p' J

0 a, z! o5 L* \4 N+ }4 z0 Z; |+ C1 e8 M" @3 z% E7 w0 L1 O
.......
- u: a$ n% l& l$ p  K  ?6 Y! P
page 301
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