Steca Power Tarom 2070, Инструкция по установке и эксплуатации

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8 Overvoltage protection in your photovoltaic system
ve vo
Photovoltaic systems have to be mounted very often on sites like mountain tops or next to high structures
like transmission poles. These locations have a high risk of damages due to lightning. Harmful levels of
over voltage will occur through direct hits or even more frequently induced by flashes as far as 100
meters. To prevent your electronic equipment from these damaging over voltage spikes, you have to
include all parts of your system into the over voltage protection: building, modules, frames, wires,
controller, inverter, loads, antenna and grounding.
In any case, a good lightning protection can reduce the risk of damages in a great measure, but not
prevent them completely. We can give you some hints for further reading, but it is not possible to describe
the overvoltage protection for all installations in detail here.
See these sites for more recommendations for lightning protection
http://www.iea-pvpsuk.org.uk/PV%20for%20standalone/T3-13%202003.pdf
O r ltage can damage your PV system
r check the internet sites from producers of over voltage protection units:
ww.dehn.de
o
w , www.phoenixcontact.de/ueberspannungsschutz , www.citel.de , www.cirprotec.com , …
Transient voltage spikes can be caused by effects of lightning. It’s not necessary that the system got a
direct hit – in this case the energy is normally tha
that the degree of destruction is obviously.
Even a discharge between clouds or a strike far
can induce energy pulses into the elec
conducting parts of the installation like wires,
structure or electronic components.
Not even a visible and/or audible lightning strike
thunder can cause a transient voltage spike.
discharges of electrostatic charge may cause tran
spikes of some 1000 V ! Such transient voltage ike
can be a positive or a negative pulse related to the ground.
s induced by distant lightning Internal overvoltage protection
to
se
rgy
If the power is too
will be destroyed by
e
the plus (+) pole of the
ient
e Power
g rack should be grounded. The module cables to the
to be as short as possible
r and modules should be as short as possible
he modules (and the load) may not be separated to avoid loops between
transient over voltage spikes
t high
away
trical
metal
with
Also
sient
sp
High voltage spike
Inside the PowerTarom there are electronic
components (varistors and suppressor diods)
limit the energy of transient spikes. The
elements normally absorb some limited ene
and convert them into heat.
big even these elements
overheating.
Some general hints for the over voltag
protection in your system:
-
grounding of
battery helps to reduce the trans
voltage level. All plus (+) terminals of th
-
the module frames and the mountin
regulator should have been shielded.
-
all connections to the ground have
-
the connections between regulato
-
the + and – cable of t
Tarom regulator are internally connected.
them
solar
generator
transient voltage spike
electronic
equipment
transient
voltage clamped
voltage
M+
suppressor varistors
diode
to
regulator
ground
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