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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:/ E7 H2 A% I+ W# }

% x: Y  ~0 {+ ~5 @* G/ S4 yGenerally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds
/ H" g3 [0 v. ]( m3 l" x1 ?1 q% V# [; Zthe breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3. S: W4 ~7 J% B  E0 e$ `
(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary! J& E( b$ O2 E3 }) x1 |9 t
Circuits, they should have high breaking capacity (1500 A) if the prospective short-circuit current
4 S/ o: ]3 N# ^0 Eexceeds 35 A or 10 times the rated current of the fuse, whichever is greater.” (In the U.S. and' P% `. U( y$ u9 `1 p
Canada, UL 248-14 fuses are indicated as appropriate alternative fuses per Annex P.2, and thus
# M5 t/ q* E! ~" i2 z, Ia similar consideration applies.) Typically, high breaking fuses are ceramic, not glass cased, and
' N# \# D' u7 Lthe note is attempting to document that the breaking capacity of a fuse is a valid consideration
( w$ ^% K- O$ H+ ]) yduring performance testing.
4 Q& Y( O. Y* T
. J3 T1 H* T, zFurthermore, a bursting fuse can expel dead metal parts onto surrounding circuitry, potentially6 ^. k9 q. E+ |! Q4 X3 t+ y* z
bridging insulation and contributing to risk of fire or electric shock. Similarly, glass and metal; |' U$ o+ B5 P; a- c; y4 o# X
pieces can be expelled through nearby enclosure openings.
* R# S7 W! o  t9 `5 m4 n( n( r, N8 D
Also, a bursting fuse terminating a test also is not a consistently repeatable result - during one
% ?8 J9 J6 ?8 _0 l& [  lapplication of a fault, the fuse may burst but none of the glass or metal may exit the unit or% A2 {3 C6 p; D& r6 V6 k
bridge live parts or insulation. With another application, it may not burst since the short circuit; }5 r2 j9 x9 t  B/ L
across a component was initiated during the zero crossing of the mains supply voltage. With( u, q" ]1 m5 _7 {
another application, the fuse may burst, expelling metal pieces that bridge live parts or critical
: Y: D2 q" N* n+ F8 x$ M" }# t8 _insulation.
! }5 U8 n  a3 l* c% L
5 o! Q' ?$ A" K) W$ {0 w/ qA bursting fuse also is not an acceptable test result in either IEC or UL component fuse
- ?/ ^/ Z! @! Q( w! F6 O  Wstandards.
 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!
$ o! x7 i8 p. q" ?2 S6 j7 i: b5 L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  :
: x, h1 H8 v) U5 H# J) gRATIONALE:1 Y' w- f' i( B  f" N  x
9 w- \* C8 V2 K( {+ U9 E# i: u
Generally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds
: }' r+ o0 y" U" B( H# ?' ~the breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3; J: V+ [& }& K4 k0 D
(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary
" c" d1 b; c, M0 ], R6 u.......

' c. T* Y% y, r+ A1 l1 j
/ D: u/ N- U+ H9 q: Z! S5 v, x4 W3 h  F: V( S0 |

' T3 ~$ M1 q( O; B8 ^' I7 i8 h& \2 a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 X# R3 n/ p' W3 d7 w3 _' S
- A0 Q. C; ^8 t" i
) P) a6 k1 G" n6 \/ {

  u" U7 X( x  D# x2 e8 l
8 r9 m) S7 w( F+ _' |/ R: W: R; L7 ~; v' I  H: X) J' D
.......
6 v& Z4 |$ }6 `2 ^) ~! j7 Z
page 301
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