逆变器中交流、直流侧的保险丝，必须要安装吗？

yeanling

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看到其他厂家的一些逆变器产品中都没有交流、直流侧保险丝。或者是只有交流侧有保险丝。那样的设计安规上是否可以？保险丝到底是否需要安装？怎么安装才符合要求呢？

11狼

大部分厂家都是在交流侧安保险丝，但是也有在直流侧安装的，这要看你的设计了

清水白菜

直流侧可有可无，通过short test评估就OK；
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）：
6 }) [. F' {! H( h, S% E$ z' N
0 E( A; T3 E3 o# G% L4.4.4.5 Output short circuit
% T. r$ t: A4 U& w# xEach power output port of the PCE, and each section of a tapped output, shall be tested one
. Z' y! M: f9 n" V' ?' i& p6 \8 fat a time, to simulate short circuits in the load or wiring. Overcurrent protection devices as
8 j) j! V+ u# Q4 D$ y( Gprovided in the PCE or as specified in the installation instructions, shall be fitted during the
9 e% y& G2 T- v: \test. All other outputs are loaded or not loaded, whichever load condition of normal use is less
favorable.
" l) V4 p9 R- }  l' ZTesting is required to be performed on all combinations of terminals for the port under
% f- N* W  J' g: a# T' c8 S- G- uconsideration, two at a time, including neutral and earth terminals, and one test with all
current-carrying terminals of the port shorted together at once. Where analysis shows that the
test for one combination is representative of other combinations, tests may be omitted.
9 Q  {1 z" }- b3 v/ n$ CIn addition to the requirements of 4.4.3, the short-circuit currents are to be recorded and if
they exceed the maximum rated current of the circuit, the maximum measured current shall be
+ |7 Y/ |& U) ^1 }- |3 o8 qprovided in the installation manual for the purpose of coordination of overcurrent protection of
the external circuit conductors (see 5.3.2).
8 R$ l; U1 ^. O" a  }! r4 OThe value(s) to be recorded and to be provided with the PCE instructions are the peak
current, and the highest of the RMS current values measured or calculated over a time period
as follows:
a) for AC signals, 3 cycles of the nominal AC frequency for the port under consideration, in
which case the value is to be stated as the 3-cycle RMS value;
7 _9 V3 |; j+ P& n  Z8 N: wb) for all signals, the duration of the short circuit from the time the short circuit is applied, until
6 o1 k  R) ]3 {2 \  r, l) kthe time the short circuit current is interrupted by a protective device or other mechanism, in
which case the value stated is to include the RMS value and the time period in seconds;
c) for short circuit tests that result in a continuous non-zero value, the steady-state RMS
8 |# n; E2 z  e0 ^value, in which case the value is to be stated as a continuous RMS value.
NOTE Where the intended use of the short-circuit current information requires a different type of measurement,
: ~; d5 m7 `% E  c& c1 o7 Dadditional data may be provided. For example, for AC mains fault current contribution some utilities may prefer a
¼-cycle RMS or other RMS calculation to the 3-cycle RMS above.

戏尘

和设计有关 然后看你做异常时FUSE 的能否保护

houfengp83

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

kevin245

沒錯 -->不管是交流侧或者直流侧都可以不用保险絲      
) C; }* e/ k4 I1 l我們以前有裝, 現在都拿掉了.