9 b Q0 F) x0 m, K' U% Z2 i4.4.4.5 Output short circuit. ?( c) I5 J. o
Each power output port of the PCE, and each section of a tapped output, shall be tested one- z3 o5 Z! V8 {
at a time, to simulate short circuits in the load or wiring. Overcurrent protection devices as2 n L5 `, E& r4 n( q. a
provided in the PCE or as specified in the installation instructions, shall be fitted during the1 a5 y( R" N# E' S+ C
test. All other outputs are loaded or not loaded, whichever load condition of normal use is less " F, V {2 ]% ~, Bfavorable. 0 T# V& x4 p% ?7 Z- \* B1 s5 A) a' W$ c+ k5 ETesting is required to be performed on all combinations of terminals for the port under : \2 G) Z7 @+ y, Q7 m: Jconsideration, two at a time, including neutral and earth terminals, and one test with all( l6 j0 o. I: ]
current-carrying terminals of the port shorted together at once. Where analysis shows that the- D9 E9 S! D8 d
test for one combination is representative of other combinations, tests may be omitted.3 Y% ^& }2 a$ V+ c
In addition to the requirements of 4.4.3, the short-circuit currents are to be recorded and if9 U! u, F5 k+ v
they exceed the maximum rated current of the circuit, the maximum measured current shall be 4 z- o9 ]5 v* L! K w e# `provided in the installation manual for the purpose of coordination of overcurrent protection of. Y( L4 S) G P$ G" b
the external circuit conductors (see 5.3.2). D" ~$ S5 A N5 t2 {2 w
The value(s) to be recorded and to be provided with the PCE instructions are the peak 1 P Y" }5 b" S! A; v+ Fcurrent, and the highest of the RMS current values measured or calculated over a time period 4 m4 R+ n' S$ N- m( das follows:6 ~' Z F! }1 q& _8 i
a) for AC signals, 3 cycles of the nominal AC frequency for the port under consideration, in 2 _" u" a `5 }: d# vwhich case the value is to be stated as the 3-cycle RMS value; 7 k! i' D3 q8 b+ R lb) for all signals, the duration of the short circuit from the time the short circuit is applied, until & F7 h$ E# E6 V/ R9 J' ]the time the short circuit current is interrupted by a protective device or other mechanism, in $ f5 J0 A# V% T8 b! qwhich case the value stated is to include the RMS value and the time period in seconds;' U% e3 l* x5 u+ r
c) for short circuit tests that result in a continuous non-zero value, the steady-state RMS 2 h# a/ n! A; v* A+ B7 Cvalue, in which case the value is to be stated as a continuous RMS value.5 S% Z1 |7 @; I3 y4 M9 V
NOTE Where the intended use of the short-circuit current information requires a different type of measurement, 0 K. `* `) R+ B6 aadditional data may be provided. For example, for AC mains fault current contribution some utilities may prefer a $ O' I) ?. a; N0 Y/ {¼-cycle RMS or other RMS calculation to the 3-cycle RMS above.作者: 戏尘 时间: 2012-8-2 00:14
和设计有关 然后看你做异常时FUSE 的能否保护作者: houfengp83 时间: 2012-8-29 19:36
不管是交流侧或者直流侧都可以不用保险丝，交流并网侧可用继电器保护异常动作，直流侧如果连接到限流源就不存在过流作者: kevin245 时间: 2013-8-30 16:56
沒錯 -->不管是交流侧或者直流侧都可以不用保险絲 % G5 ?" a5 z2 d7 Z我們以前有裝, 現在都拿掉了.