Decentralised system
A decentralised system means that multiple inverters are installed on the area for only a few strings (all strings are not led into one central inverter). This eliminates extensive DC wiring and allows the installation of a SPD type T1, or in the best case, a combined T1+T2 SPD, only in position A, i.e. as close to the inverter as possible. A suitable SPD representative can be HLSA12,5
PV 1 500. This product is determined specifically for UCPV = 1 500 V DC, but we also offer
variants for 1 000 V DC. It is in Y connection, which is resistant to earth fault of live conductors and
has zero residual (leakage) current. If you insist on a cheaper variant, we also offer variants in the
same voltage range in U connection with a marking /2 at the end of the product name. The HLSA12,5 PV product
series for LPL levels I and II is not equipped with an internal DC arc fault disconnector, and therefore
back-up fuse is required. If remote monitoring of the surge protection status is required, the variants
marked S can be used, i.e. for example HLSA12,5 PV 1 500 S. The potential-free contact
of this remote monitoring is then connected to the building‘s control system (typically as an input of
a PLC control system), where it permanently informs the investor about the status of the surge protection
device, without the need for physical control of the switchboard.
On the other hand, due to extensive wiring on the AC side, it is necessary to install two SPDs type T1,
or in the best case to select a combined SPD type T1+T2+T3, at position B and C, as the distance between
the inverter and the main switchboard is longer than 10 m. In this switchboard, it is common to find a
TN-C system configuration with a voltage size of 3 x 230 V / 50 Hz. HLSA25G-255/3+0 S in
the remote monitoring version corresponds to these conditions at position C. If the entire electrical
distribution of the building is of TN-S type, the HLSA25G-255/4+0 S configuration can
be used. SPD type T1 needs to be repeated directly in front of the inverter - position B. If we consider
a three-phase TN-C system, a suitable representative is, for example, HLSA12,5-275/3+0 M S.
There are also cases where there is an isolated power supply system on the AC side, for this case it is
important to select an SPD from a series directly designed for the IT power supply system, e.g. HLSA12,5-440/3+1
IT, which is installed in both positions.
Our solutions
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SPD FOR DC (INVERTER)Nahrávám ...
By ticking this box you will give us the information that you are not sure about the correctness of your selection. However, it is necessary to send an inquiry. -
SPD FOR AC (INVERTER)Nahrávám ...
By ticking this box you will give us the information that you are not sure about the correctness of your selection. However, it is necessary to send an inquiry.
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SPD FOR ACNahrávám ...
By ticking this box you will give us the information that you are not sure about the correctness of your selection. However, it is necessary to send an inquiry.