18
EN
Load protection breaker (AC disconnect switch) and differential protection downstream of the inverter
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):
PVS-100-TL PVS-120-TL
Type Automatic circuit breaker with differential thermal-magnetic protection
Nominal Voltage /Current 400 Vac / min. 150 A (*) 480 Vac / min. 150 A (*)
Magnetic protection characteristic Magnetic curve B/C
Number of poles 3/4
(*): please consider thermal and other derating when selecting the current rating of the protection equipment for your application.
In case of installation of a residual current protection, the device shall meet the following characteristics in order to prevent nui-
sance tripping due to capacitive leakage current of photovoltaic modules:
PVS-100-TL PVS-120-TL
Type A / AC
Sensitivity 1.0 A 1.2 A
ABB declares that the ABB transformerless inverters, in terms of their construction, do not inject continuous earth fault currents
and therefore there is no requirement that the differential protection installed downstream of the inverter be type B in accordance
with IEC 60755 / A 2.
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 configuration have 4xM40 cable glands for the ”N” neutral, “R”, “S”, “T” phases and a M25 cable gland for the earth cable.
• Multi-core configuration (optional) have a M63 cable gland for the ”N” neutral, “R”, “S”, “T” phases and a M25 cable gland for the
earth cable.
The cross-section of the AC line conductor 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 point.
Single core cable Multi-core cable
Cable diameter range 19 - 28 mm 37 - 53 mm
Min. conductor cross section 50 mm²
Cable lug dimensioning
b
a
for M10 Stud
a = 10.5 mm (min)
b = 40 mm (max)
The AC connection busbars (21) are in copper tin-plated; therefore if aluminum cables are used, the correct cou-
pling with the copper bars must be guaranteed by using appropriate bi-metallic cable lug.
ABB inverters must be earthed via the connection points marked with the protective earth symbol and using a cable with an ap-
propriate conductor cross-section for the maximum earth fault current that the generating system might experience.
area.
Any failure of the inverter when it is not connected to earth through the appropriate connection point is not cov-
ered by the warranty.
The earth connection can be made through the Protective Earth point (int.) (25) or Protective earth point (ext.) (10) or both (if this
is required by regulations in force in certain countries of installation).
The sizing of the earth cable depend on the choice of the connection point (internal (25) or external (10)) where it will be con-
nected:
Protective earth point (int.) (25) Protective earth point (ext.) (10)
Cable diameter range 10 - 17 mm (M25 cable gland) -
Max. conductor cross section 95 mm² -
Cable lug dimensioning
b
a
for M10 Stud
a = 10.5 mm (min)
b = 40 mm (max)
for M8 Stud
a = 8.4 mm (min)
b = all dimension accepted
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Line cable and protection devices
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Characteristics of the protective grounding cable
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