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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:8 U5 }) A# T/ u* }2 R

# l$ T# P" `4 y: P) g0 V2 L2 \Generally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds
" V( o2 d3 ?1 |$ T) Uthe breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3
! ?: B" A8 M7 F2 p, T4 Y(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary0 c$ J" I8 C/ d+ _
Circuits, they should have high breaking capacity (1500 A) if the prospective short-circuit current7 L9 U: x) i) z3 S
exceeds 35 A or 10 times the rated current of the fuse, whichever is greater.” (In the U.S. and
8 J- p: X8 Z9 k, m5 oCanada, UL 248-14 fuses are indicated as appropriate alternative fuses per Annex P.2, and thus+ }5 n( T, E3 C& ?
a similar consideration applies.) Typically, high breaking fuses are ceramic, not glass cased, and
- W- h  b1 J6 _7 k# d! a$ u0 |1 zthe note is attempting to document that the breaking capacity of a fuse is a valid consideration
4 j/ A: I+ G" J) S  N! pduring performance testing.
9 }& M  z" \- b8 W/ ^7 L" @7 z+ U) r( r7 I, R2 D3 E: q7 _. S
Furthermore, a bursting fuse can expel dead metal parts onto surrounding circuitry, potentially! H. `! I' m9 L: p6 p! q7 D
bridging insulation and contributing to risk of fire or electric shock. Similarly, glass and metal
9 f5 \- V" o( Q; spieces can be expelled through nearby enclosure openings.! d  W  W0 T1 U. |4 o: I
; N/ s  ^3 _$ y, {' j4 X; j
Also, a bursting fuse terminating a test also is not a consistently repeatable result - during one! T0 i$ R* G5 }/ X
application of a fault, the fuse may burst but none of the glass or metal may exit the unit or
0 W( r) q+ t' O: A( wbridge live parts or insulation. With another application, it may not burst since the short circuit9 \3 D/ O/ G- a$ P3 [/ m
across a component was initiated during the zero crossing of the mains supply voltage. With! Q" s1 _, U2 L5 e8 [, a
another application, the fuse may burst, expelling metal pieces that bridge live parts or critical9 G' B- x; Z" V. v
insulation.) `  Q) Y" x" x) [" l( ^8 u
7 S7 N  h& }3 t+ v% ^1 z
A bursting fuse also is not an acceptable test result in either IEC or UL component fuse( p) `; ?# e- K$ U/ o: h  X- r
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!% o! Q* x& |& E% }: ]
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  :
( V, j3 V  y1 fRATIONALE:
0 W9 w0 g$ Z0 u1 u" ]. K: ]' M7 g' u1 D
1 E2 i6 H7 M( uGenerally, when a fuse bursts it is because it is subjected to a short-circuit current that exceeds
1 Z" J3 X5 v% T' r; G' Sthe breaking (rupturing) capacity of the fuse. The informative Note to sub-clause 2.7.3, s7 P! y! S& \* F% v& M& H
(Short-circuit backup protection) states “If fuses complying with IEC 60127 are used in Primary1 `5 R* d( `& v! T
.......

) U- f0 A( w; Z3 ~9 J% R  Y# ^1 l8 Z0 M6 n

% A: l1 P  p+ P# b1 ]
, b1 C+ p8 J  e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  :
7 p7 p4 s  y6 @& E1 L( u7 p/ s; W7 U# b
% a* C" G& f+ y: F, m

( _. |: Z/ G6 C9 j- O, J: G" ^$ ~# A3 d- e0 }; |$ U

8 J! C4 m/ @) x7 o+ u.......

9 r; v9 M/ D; u5 @; Kpage 301
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