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直流侧可有可无，通过short test评估就OK；
& h! S; d: Z! j0 ^, {5 S交流侧就看你设计了，要样机里没有，需在说明书中说明装机时交流侧用的外置Fuse的Rating，相关要求如下（IEC 62109-1）：
( n$ |; O' M6 u3 p* n! l N2 l/ [# Q8 k' x v& c
4.4.4.5 Output short circuit9 T# C; g* l3 H9 a4 w
Each power output port of the PCE, and each section of a tapped output, shall be tested one: j& p5 A% ~ Q! y$ _ S
at a time, to simulate short circuits in the load or wiring. Overcurrent protection devices as% S9 m L3 C1 \2 m' T
provided in the PCE or as specified in the installation instructions, shall be fitted during the
3 k& K% [1 G6 F2 r, @4 o! ftest. All other outputs are loaded or not loaded, whichever load condition of normal use is less* w/ v. k7 L/ A. j
favorable.0 ~9 ~! |3 Q) o5 M6 A
Testing is required to be performed on all combinations of terminals for the port under; o6 ]; O) O1 P+ y1 w
consideration, two at a time, including neutral and earth terminals, and one test with all
* R; a6 N" ]$ s% [current-carrying terminals of the port shorted together at once. Where analysis shows that the) j! y6 C& e) \; W( V
test for one combination is representative of other combinations, tests may be omitted.! X n) G# p1 m) |8 q- S
In addition to the requirements of 4.4.3, the short-circuit currents are to be recorded and if
! Y: f. ~# y' G; O* O, Bthey exceed the maximum rated current of the circuit, the maximum measured current shall be: x8 }* X+ c% |
provided in the installation manual for the purpose of coordination of overcurrent protection of* o4 Y9 N0 a. i3 s7 J# q3 A B/ Z
the external circuit conductors (see 5.3.2).
2 V' f; I m( a( _ d4 L2 {The value(s) to be recorded and to be provided with the PCE instructions are the peak% Q9 M' ]% k3 w% \! \; Q
current, and the highest of the RMS current values measured or calculated over a time period, Q$ l. \! ~$ s( V8 b
as follows:; a: e+ r, T+ B% C$ `1 n* I& \+ ]
a) for AC signals, 3 cycles of the nominal AC frequency for the port under consideration, in) s' y- W" ]0 g) J! g, U+ E4 J
which case the value is to be stated as the 3-cycle RMS value;0 L$ U+ T: H+ z9 G* k4 T
b) for all signals, the duration of the short circuit from the time the short circuit is applied, until
! ?$ k; I" N z0 }! j- sthe time the short circuit current is interrupted by a protective device or other mechanism, in
; H# c. J4 l Q/ I$ j7 Kwhich case the value stated is to include the RMS value and the time period in seconds;
5 i* X7 y2 d# l$ lc) for short circuit tests that result in a continuous non-zero value, the steady-state RMS
2 T) ~5 p7 u$ |/ E" Hvalue, in which case the value is to be stated as a continuous RMS value.
5 {* P0 S4 K( ^/ ^NOTE Where the intended use of the short-circuit current information requires a different type of measurement,
) p v }7 J, e: Padditional data may be provided. For example, for AC mains fault current contribution some utilities may prefer a
8 v8 s, I; U) ~! S" K6 S4 ]( u; X¼-cycle RMS or other RMS calculation to the 3-cycle RMS above. |
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发表于 2012-7-31 20:32
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