7P.26.9.420.1020 FINDER, 7P.26.9.420.1020 Datasheet - Page 20

• Manufacturer Part Number: 7P.26.9.420.1020
• Description: SURGE ARRESTER, PV TYPE, 420VDC
• Manufacturer: FINDER

Specifications of 7P.26.9.420.1020

• Current Rating: 100mA
• Supply Voltage: 420VDC
• No. Of Poles: 1
• Mounting Type: DIN Rail
• Rohs Compliant: Yes
• Svhc: No SVHC (20-Jun-2011)

Photovoltaic system on a building without a lightning protection
system (LPS)
As an example, Figure 10 represents a simplified photovoltaic system
placed on a building without lightning rod. In such a system, the
protection against lightning must be considered at the following points
of installation:
- DC input of the inverter
- AC output of the inverter
- Low voltage supply network
At the DC input to the inverter SPDs specific for photovoltaic systems
must be installed, according to the PV system voltage. At the inverter
AC output, type 2 surge arresters must be installed suitable for the type
of system. At the point of connection to the LV supply network, install
type 2 surge arresters suitable to the type of system (TT, TN). In more
complex systems, it might be necessary to introduce additional SPDs.
For example; if the PV panels are more that 10m from the inverter: fit
one set of SPD as close as possible to the panels and one close to the
inverter. At the point to delivery of energy, must be connected an SPD
Type 1 or combined (1+2).
Figure 10: example of a photovoltaic system located on a building
without LPS, protected on the DC side by an SPD with U
and on the AC side by a 7P.22, specific for TT systems.
Photovoltaic system on a building with a lightning protection
system (LPS)
Where an LPS exists it is good practice to install the photovoltaic
panels in the area protected by the lightning rod.
In addition it is necessary to realize a good equipotential bonding
system, which must be positioned as close as possible to the entry point
of LV supply into the structure. The LPS, the SPD and all metal parts have
to be connected to this equipotential system.
SPD protection on the DC side is the same as for systems without LPS,
consequently an arrester for PV systems of a suitable voltage (U
should be used.
An appropriate Type 2 SPD should protect the AC side of the inverter,
assuming a Type 1 SPD is already installed upstream.
However, if the inverter is sited in the field, for example; below the
structure that supports the panels, then we recommend installing a Type
1 SPD to the AC side, instead of Type 2. Note that under EN 62305
installation of a Type 1 SPD is mandatory at the point of delivery of
electricity, if the building has LPS (with or without solar panels).
20
OC STC
= 420 V,
OC STC
)
7P Series - Surge Protection Device (SPD)
SPD fuse protection
The Finder SPD can break a 100 A DC (@200 V DC) current. This means
that for short circuit current of string (Isc) lower than 100 A, it is not
necessary to install a back up fuse.