|
The fuse-link is short-circuited during the test and the current passing through both the fuselink
A0 ~1 W3 z8 ]4 W4 }: T5 k. \and the short-circuit link under the relevant fault condition, is measured:1 V4 M5 B- r0 O. N9 i' `7 `
– if this current remains less than 2,1 times the rated current of the fuse-link, the. [, q& b3 O5 X& i- q
temperatures are measured after a steady state has been attained;
0 e! @: |4 ~- l/ V* j– if this current is either immediately 2,1 times the rated current of the fuse-link or more, or' C1 V# F+ E9 v0 V2 W
reaches this value after a period of time equal to the maximum pre-arcing time for the% q# A) ]5 {8 |+ o! c' V
relevant current through the fuse-link under consideration, both the fuse-link and the shortcircuit
1 q# ?0 u' h9 o0 i4 l/ C7 clink are removed after an additional time corresponding to the maximum pre-arcing
! f4 l$ g/ T& e: B* `& Ftime of the fuse-link under consideration and the temperatures are measured immediately.: v- z5 N+ U" j4 W& `7 o" E
; k. ?# ^6 Z- G% c6 m5 c6 y
以上是有关熔断体的操作问题,我想问的是:+ o* n; G/ |- U' Y# X) m, X; T
1.为什么是2.1倍的额定电流值,不是1.5倍,2倍,也就是为什么是2.1不是其他值% j$ u ?! k0 Z5 Y/ h2 v
2.pre-arcing time 怎样计算呢? |
|