( ~* J- h8 g" y5 W7 }4.4.4.5 Output short circuit& N) ]( R+ i# u I( v* k% I
Each power output port of the PCE, and each section of a tapped output, shall be tested one + F4 W% C5 z& f2 y$ rat a time, to simulate short circuits in the load or wiring. Overcurrent protection devices as3 q# G7 b6 C: {5 l: ]" H2 a: e4 j
provided in the PCE or as specified in the installation instructions, shall be fitted during the 9 {, f3 J T( U5 m2 utest. All other outputs are loaded or not loaded, whichever load condition of normal use is less 6 P9 s- {8 ?5 B8 G# R' k! ?' qfavorable./ h% G1 B7 M! Q, b2 W. @/ Z: ?
Testing is required to be performed on all combinations of terminals for the port under 2 y- M8 V+ Y* Oconsideration, two at a time, including neutral and earth terminals, and one test with all4 D* |: t, t" e8 \0 k
current-carrying terminals of the port shorted together at once. Where analysis shows that the j: o# R" @! ztest for one combination is representative of other combinations, tests may be omitted. # x1 L( ?* Z+ [In addition to the requirements of 4.4.3, the short-circuit currents are to be recorded and if : \' a# Y6 o+ K4 s' {they exceed the maximum rated current of the circuit, the maximum measured current shall be3 Q: s( `" J# g
provided in the installation manual for the purpose of coordination of overcurrent protection of 1 o3 o2 m/ m7 d1 jthe external circuit conductors (see 5.3.2). ! M5 S5 ]& H5 a9 dThe value(s) to be recorded and to be provided with the PCE instructions are the peak3 k+ B" T1 }" i- S3 l8 c9 A$ r
current, and the highest of the RMS current values measured or calculated over a time period " [2 F+ q3 o+ [2 `' k2 eas follows:6 n0 N( r5 r9 T2 H
a) for AC signals, 3 cycles of the nominal AC frequency for the port under consideration, in! t& u$ K8 {$ ^9 V1 x: F# C8 a$ x Y
which case the value is to be stated as the 3-cycle RMS value;' {7 d1 U/ \2 ?
b) for all signals, the duration of the short circuit from the time the short circuit is applied, until9 ]: C" _+ X. F$ w {/ g
the time the short circuit current is interrupted by a protective device or other mechanism, in ( J. q1 A" u5 Awhich case the value stated is to include the RMS value and the time period in seconds; $ w7 f/ l4 n# w) _$ Q6 F+ I4 A+ ~c) for short circuit tests that result in a continuous non-zero value, the steady-state RMS ) E/ d, M3 u* g4 H! fvalue, in which case the value is to be stated as a continuous RMS value. ) H. a/ `8 W3 ~) x9 K1 t* qNOTE Where the intended use of the short-circuit current information requires a different type of measurement, & o1 K' n, [7 ?, Aadditional data may be provided. For example, for AC mains fault current contribution some utilities may prefer a# J- `$ Z: F8 S; T2 ?2 | p
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 . c% }. L) j8 R5 E# _# o- o
我們以前有裝, 現在都拿掉了.