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直流侧可有可无，通过short test评估就OK；$ k6 r% N- D# Y$ }, Z
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）：8 y/ H+ H1 | N; l
, Y9 p; l6 z( ?. }# W
4.4.4.5 Output short circuit
' I/ S! J5 x* hEach power output port of the PCE, and each section of a tapped output, shall be tested one' t' _. G5 y4 [- O+ g0 y& E8 C
at a time, to simulate short circuits in the load or wiring. Overcurrent protection devices as% t2 x4 ]) w4 n: x* S( N1 q
provided in the PCE or as specified in the installation instructions, shall be fitted during the. Z6 R7 _6 x* `6 ^% j
test. All other outputs are loaded or not loaded, whichever load condition of normal use is less
g2 R# y' C7 U- l! Wfavorable.
; w0 ]. J1 b, g' R" S4 P' D/ x3 I/ sTesting is required to be performed on all combinations of terminals for the port under
" P* p' b. T- B* H- i" ~consideration, two at a time, including neutral and earth terminals, and one test with all2 v5 X; n: ^( K6 q% _
current-carrying terminals of the port shorted together at once. Where analysis shows that the
: s# g( ]+ \& n: {; @% I/ etest for one combination is representative of other combinations, tests may be omitted.
" G: R: }2 W6 L3 p/ tIn addition to the requirements of 4.4.3, the short-circuit currents are to be recorded and if0 S$ V( ? [4 i7 N G" P
they exceed the maximum rated current of the circuit, the maximum measured current shall be+ q; j" g% M( p# x5 O; z r
provided in the installation manual for the purpose of coordination of overcurrent protection of
: W1 q7 C: _4 |6 f4 ^1 `' P6 Sthe external circuit conductors (see 5.3.2).- u% ~( u0 k! Y9 ~
The value(s) to be recorded and to be provided with the PCE instructions are the peak; h+ L% W% h; j! `
current, and the highest of the RMS current values measured or calculated over a time period8 y. E G8 u+ e0 |# L% ^8 j8 p9 j
as follows: ]5 P5 t* j9 _0 s0 j
a) for AC signals, 3 cycles of the nominal AC frequency for the port under consideration, in' l1 L% y. o' @) V) }5 T, m" Q
which case the value is to be stated as the 3-cycle RMS value;% J) ^, [3 [/ P( J1 H6 {
b) for all signals, the duration of the short circuit from the time the short circuit is applied, until6 i) g% ]; p K& K; t" r" |+ z
the time the short circuit current is interrupted by a protective device or other mechanism, in
/ i9 J% T+ h5 i0 Awhich case the value stated is to include the RMS value and the time period in seconds;3 f) \7 q: L2 f% P& l
c) for short circuit tests that result in a continuous non-zero value, the steady-state RMS
s' F" W/ Q* w$ S% D/ vvalue, in which case the value is to be stated as a continuous RMS value.- l/ e$ @' ~4 A' R$ ?2 \
NOTE Where the intended use of the short-circuit current information requires a different type of measurement,
5 m" z) [- g) Aadditional data may be provided. For example, for AC mains fault current contribution some utilities may prefer a
; ^4 Q9 m% ^: \- x- T# Z¼-cycle RMS or other RMS calculation to the 3-cycle RMS above. |
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