3. Application information
KP100L Quick Installation Guideline
14
Ground fault breaker / RCD (Residual Current Device)
For KP100L, the use of RCDs type B is not indispensable and RCDs type A can be used.
KP100L has built-in fault current protection function required in Germany standard of
VDE V 0126-1-1:2006-02, so DC residual current can be detected and cannot flow to the grid.
Notice of selecting RCD
・
The use of RCDs for each unit is recommended.
・
I
Δ
n(rated residual operating current of RCD) has to be selected according to the local regulations about
the
system configuration, and residual current caused by capacitive characteristic of cable and PV modules.
・
In the systems which DC current detection of I
Δ
n<30mA is required, type B has to be used.
・
KP100L has built-in fault current protection function but residual current is not zero, so the more
KP100L installed units, the much residual current flows in the grid. When multiple KP100L are
installed, downstream RCD(for KP100L) and upstream RCD has to be determined by
consideration of increasing residual current.
・
Ultimately, the selection of RCD depends on System Integrators’ judgment. OMRON provide this
information for selection of RCDs, but we are not responsible for the selection of RCD.
SPD in Grid side
SPD is used to protect the inverter against lightening surge voltage in AC line.
Example of SPD
•
Class II
•
Nominal voltage 230/400 VAC
•
Nominal discharge current (8/20us) I
n
:20 kA
•
Maximum discharge current (8/20us)I
max
:40 kA
•
Protection revel: 1.5 kV
This is just example. Contact company of
protection device for selection.
L1
L2
L3
N
PE
