EN
38
5.4 Grid output connection (AC side)
WARNING –
B
To avoid risks of electrical shock, all wiring
operations must be carried out with the disconnect switch
downstream of the inverter (grid side) opened and applying
LOTO procedure on it. Be careful not to mistakenly exchange
the phases with neutral!
The inverter must be connected to a three-phase system with the
center of the star connected to ground:
• TN-C
• TN-C-S
• TN-S
• TT
L2
PEN
L1
L1 L2 L3 N PE
L3
L2
N
L1
L3
L2
L1
L3
L2
N
L1
L3
PE
TN-C
L1 L2 L3 N PE
L1 L2 L3 N PE
TN-C-S
IT
L1 L2 L3 N PE
L1 L2 L3 N PE
TN-S
L2
N
L1
L3
PE
TT
NOTE –
D
The connection of the neutral (N) on the inverter is
optional (dashed line on the above schematics); the inverter
will automatically detect the presence or absence of the
connection without any setting by the user.
To connect the inverter to the grid could be use a connection cable:
•
3W
(3 phases).
•
3W + PE
(3 phases without neutral wire)
•
4W + PE
(3 phases with neutral wire).
ATTENTION –
A
In any case, the inverter’s earth (PE)
connection is mandatory according to IEC 62109.
5.4.1 Load protection breaker (AC disconnect
switch)
To protect the AC connection line of the inverter, an overcurrent
protection device with the following features must be installed
(these are the caracteristic of a load protection switch referred to a
single inverter installation):
Load
protection
breaker
PVS-10-TL
PVS-12.5-TL PVS-15-TL
Type
Automatic circuit breaker with thermal-
magnetic protection
Voltage/
current rating
400Vac
min25A (*)
400Vac
min32A (*)
400Vac
min32A (*)
Magnetic
protection
characteristic
Magnetic curve B/C
Number of
poles
3W (3 phases without neutral wire) or
4W (3 phases with neutral wire).
(*): please consider thermal and other derating when selecting the
current rating of the protection equipment for your application.
5.4.2 Differential protection downstream of the
inverter
All FIMER string inverters commercialized in Europe are equipped
with a device for protection against ground faults in accordance
with the safety standard IEC 62109-2 (please refer to sections
4.8.2 and 4.8.3 of the Standard). In particular, FIMER inverters
are equipped with a reading redundance for the ground leakage
current sensitive to all components of both direct and alternating
current. Infact the measurement of the ground leakage current
is carried out simultaneously and independently by 2 different
processors: it is sufficient for one of the two to detect an anomaly
to trip the protection, with consequent disconnection from the grid
and to stop the conversion process.
Furthermore, there are other three tripping levels with limit set
respectively at 30 mA, 60 mA and 150 mA to cover the “rapid”
changes in fault current induced by accidental contact with leaking
live parts. The max. tripping times are progressively shortened as
the speed of change in the fault current increases and, starting
from the 300 msec/max for the 30 mA change, they are reduced
respectively to 150 msec and 40 msec for 60 mA and 150 mA
changes.
In case of installation of a residual current protection device, this
shall meet the following characteristics in order to prevent nuisance
tripping due to capacitive leakage current of photovoltaic modules:
Residual current
protection
device
requirements
PVS-10-TL
PVS-12.5-TL PVS-15-TL
Type
A / AC
Sensitivity
300mA
NOTE –
D
For protection of the AC line, on the basis of the
information above with regard to the differential protection
integrated in FIMER inverters, it is not necessary to install a
type B ground fault switch.
NOTE –
D
In accordance with article 712.413.1.1.1.2 of
Section 712 of IEC Standard 64-8/7, we hereby declare that,
because of their construction, FIMER inverters do not inject
ground fault direct currents.
NOTE –
D
In the case of systems which consist of several
inverters connected to a single switch with differential
protection, it is recommended to install a device which allows
the adjustment of the tripping value and the tripping time.
Содержание FMR-PVS-10-TL-SX
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