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5.9.3 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.
There is an absolute threshold of 1.0 A for PVS-100-TL or 1.2 A for
PVS-120-TL and of total leakage current AC+DC with protection
tripping time at a max. of 300 msec.
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-100-TL
PVS-120-TL
Type
A / AC
Sensitivity
1.0 A
1.2 A
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.
5.9.4 Characteristics and sizing of the line
cable
Depending of the type of the AC panel it’s possible to use single
conductors cables or a multipolar cable:
• Single-core AC panel
(11)
configuration have 4xM40 cable glands
(62)
for the ”N” neutral, “R”, “S”, “T” phases and a M25 cable gland
(23)
for the earth cable.
• Multi-core AC panel
(56)
configuration (optional) have a M63
cable gland
(63)
for the ”N” neutral, “R”, “S”, “T” phases and a
M25 cable gland
(23)
for the earth cable.
The cross-section of the AC line conductor cables must be sized
in order to prevent unwanted disconnections of the inverter from
the grid due to high impedance of the line that connects the
inverter to the power supply; If the impedance is too high it causes
an increase in the AC voltage which, on reaching the limit set by
the standards in the country of installation, causes the inverter to
switch off.
The AC cables must be connected to the AC connection busbar
(21)
using a cable lug (not supplied) of a suitable size for installation
on the M10 threaded studs used for securing the cable.
Single
conductor
cable
Multipolar
cable
Cable diameter range
19 - 28 mm
37 - 53 mm
Conductor cross section min. 70mm
2
...max 185mm
2
Cable lug dimensioning
b
a
for M10 Stud
a = 10.5 mm (min)
b = 40 mm (max)
Conductor material
copper or aluminum
ATTENTION –
A
The AC connection busbars
(21)
are in
copper tin-plated; therefore if aluminum cables are used, the
correct coupling with the copper bars must be guaranteed by
using appropriate bi-metallic cable lug.
5.9.5 AC output cables connection
WARNING –
B
Before carrying out any operation, check that
any external AC switch downstream to the inverter (grid side)
are in OFF position and check for voltage absence on the
AC conductors!
Routing of the AC cables inside the inverter must be carried out
from the right side of the inverter.
Depending of the version of the AC panel installed on the inverter
it will be necessary to route the AC output and ground cables into
different ways:
Single-core configuration (11) (default) :
4xM40 cable glands
(62)
for the ”N” neutral, “R”, “S”, “T” phases
and a M25 cable gland
(23)
for the earth cable.
In this configuration the AC output and ground cables must be
inserted into the proper cable glands, trying to follow a logical order
based on the position of the internal connections:
•
N = Neutral (indicated with a label near the AC connection busbar
(21)
)
•
T = Phase T (indicated with a label
near the AC connection busbar
(21)
)
•
S = Phase S (indicated with a label
near the AC connection busbar
(21)
)
•
R = Phase R (indicated with a label
near the AC connection busbar
(21)
)
• The earth connection can be made
using the Protective earth point
(int.)
(25)
, Protective earth point
(ext.)
(10)
or both (this is required
by regulations in force in certain
countries of installation).
= Earth (indicated with the
protective earth symbol near the protection earth connection
point (int.)
(25)
or protection earth connection point (ext.)
(10)
).
Multi-core configuration (56) (optional):
one M63 cable gland
(63)
for the ”N”
neutral, “R”, “S”, “T” phases and a
M25 cable gland
(23)
for the earth
cable.
This version of the AC panel can be
ordered separately.
PVS-100_120-TL_B2
23
62
PVS-100_120-TL_B2
63
23