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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:
, W% z; G$ c; h. _, o# w6 D0 L1 k, a7 d  Y( e
Generally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds
( w* U6 I& [9 @3 Y: u$ ithe breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3% m" u1 g" J; t. H! S
(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary
- Z+ B9 [) j9 y; k) GCircuits, they should have high breaking capacity (1500 A) if the prospective short-circuit current# b  r9 |# n! y1 x- u1 A. r( {2 k
exceeds 35 A or 10 times the rated current of the fuse, whichever is greater.” (In the U.S. and
. m) ~0 R+ F: r% C8 h; w* y2 C! |/ fCanada, UL 248-14 fuses are indicated as appropriate alternative fuses per Annex P.2, and thus( n4 ^/ g$ @3 f$ c/ H! X* a
a similar consideration applies.) Typically, high breaking fuses are ceramic, not glass cased, and
. A. @" x. A/ v+ f5 i3 gthe note is attempting to document that the breaking capacity of a fuse is a valid consideration' v8 O+ n6 g+ x& \2 S' Q1 V/ o! i
during performance testing.- s! D6 k) i0 d2 d' w4 Z% L

" T4 h+ J/ f- R% W$ z, j1 Y: A8 gFurthermore, a bursting fuse can expel dead metal parts onto surrounding circuitry, potentially
/ `; a9 a! I& |8 I: p$ Nbridging insulation and contributing to risk of fire or electric shock. Similarly, glass and metal" ~5 @1 y2 w) L0 Y
pieces can be expelled through nearby enclosure openings.
+ k: ?8 r* r) H; B6 ^5 V1 q
/ J5 \/ h/ p4 u: g5 eAlso, a bursting fuse terminating a test also is not a consistently repeatable result - during one
/ t* p# t, r3 H6 ]  Capplication of a fault, the fuse may burst but none of the glass or metal may exit the unit or
. n" U/ `/ Z7 W0 V3 W: mbridge live parts or insulation. With another application, it may not burst since the short circuit7 u! C5 H5 s! }* M
across a component was initiated during the zero crossing of the mains supply voltage. With& h7 _+ I* [0 p
another application, the fuse may burst, expelling metal pieces that bridge live parts or critical
: x% d! Y6 X' r% ^7 ?insulation.# u* ]: j' @1 B4 g0 P
$ m2 ]. r0 q9 m0 V% L- U
A bursting fuse also is not an acceptable test result in either IEC or UL component fuse; e, W! \" s: _3 s9 u# `
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!9 Z$ o- z/ y8 B) m1 P
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  :* ^, r, u* j7 i0 [) l5 W6 E" ~
RATIONALE:3 L; u0 a  }* f* v. A1 L, L

1 b& n- Y& f# I4 V" KGenerally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds
, K- s- ]8 J, Qthe breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3, P1 z2 t6 j! D% ^2 S
(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary" k7 f6 W& e% X% _9 T7 }3 d+ P
.......

$ I: y8 O+ s3 R  {( s! J
0 y2 a  F4 V$ k" Y% r: Q5 g" e6 L5 o5 o/ u4 m0 F
/ ?2 D& y6 w- I) c# g
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  :
: M3 q( a2 g3 ^4 q
  T- @  f+ U/ n1 r/ e. N. g+ c3 q( K. T( Y

) Y+ ^2 ?: S& `3 w) C! V$ k& J% Z) B" W7 H2 f
. ~! W4 x6 f0 @3 p0 t
.......

+ A9 B9 V; T0 ]* K# d) g; Y7 h% M/ hpage 301
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