With LPS where the separation distance "s" is not observed
If the building has an air termination system and the separation distance between the air termination system and the panels is not observed, there is a risk of a direct lightning strike to the building and the PV system (impulse current with parameters of 10/350 µs). In this case, it is necessary to install SPD type T1, or in the better case to select a combined SPD type T1+T2. This type of building normally belongs into the LPL II level, for which the use of a surge arrester for PV applications with a discharge ability of 9,375 kA/pole is required using a supplementary earthing connection. A suitable SPD representative on position A, or on positions A and D when the distance between the inverter and the panels is greater than 10 m, may be the HLSA12,5
PV 1 000. This product is determined specifically for the voltage UCPV = 1 000 V DC, but we also
offer variants for 1 500 V DC. It is in the Y connection, which is resistant to the 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 1 000 S. The potential-free
contact of this remote monitoring is then connected to the 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. If the PV array is
protected by an external LPS and if sufficient separation distance cannot be observed, the external LPS
must be connected directly to the metal structure of the PV panels.
Since the building is equipped with an air termination system, it is necessary to install SPD type T1
in the main switchboard - at position C, or in the best case to select combined SPD type T1+T2+T3. This
type of building normally belongs into the LPL II level, for which the use of an 18,75 kA/pole arrester
is required. In this switchboard, at the beginning, before the PEN conductor is split into PE and N conductors,
it is common to see a TN-C system configuration with a voltage value of 3x 230 V / 50 Hz. These conditions
correspond to the product HLSA25G-255/3+0 S with remote monitoring. If the entire electrical
distribution system of the building is of type TN-S, the configuration HLSA25G-255/4+0 S can
be used. If the inverter is more than 10 m away from the main switchboard, it is necessary to repeat SPD
type T1 directly in front of the inverter - position B. If we consider a three-phase TN-S system, a suitable
representative is, for example, HLSA12,5-275/3+1 M S.
Our solutions
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SPD FOR DC (INVERTER)Nahrávám ...
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SPD FOR AC (INVERTER)Nahrávám ...
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SPD FOR ACNahrávám ...
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SPD FOR DCNahrávám ...
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