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The fuse-link is short-circuited during the test and the current passing through both the fuselink
) Q8 u4 U- q! D. kand the short-circuit link under the relevant fault condition, is measured:* A0 G, U5 O" }* H
– if this current remains less than 2,1 times the rated current of the fuse-link, the
: e1 b) g7 \0 f+ I/ ltemperatures are measured after a steady state has been attained;0 m# M R) R9 @) v' l
– if this current is either immediately 2,1 times the rated current of the fuse-link or more, or1 Q8 v# Z( P: y: P& d" Q/ _' _
reaches this value after a period of time equal to the maximum pre-arcing time for the& P* K0 A# @1 t \8 z# M
relevant current through the fuse-link under consideration, both the fuse-link and the shortcircuit' r0 K9 Y9 }( b
link are removed after an additional time corresponding to the maximum pre-arcing
) {3 ?3 H4 a4 ~5 _- ktime of the fuse-link under consideration and the temperatures are measured immediately.
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* ~( j, ?1 C) T7 ~2 X3 {以上是有关熔断体的操作问题,我想问的是:2 i! x9 W) l7 y, M# C; ]: J$ j0 C
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& q* }+ n" F4 i; J3 K
2.pre-arcing time 怎样计算呢? |
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