Features - ABB PRO-33.0-TL Series Product Manual

28 Hardware description

Features

Feature
Automatic operation
DC reverse polarity
protection,
monitored
DC ground-fault
monitoring
MPPT
Residual current
detection
AC grid monitoring
with anti-islanding
AC overcurrent trip,
monitored
AC short-circuit
protection
Overtemperature
protection
DC switch
(-S & -SX)
DC string fuses,
monitored
(-SX)
String monitoring
(-SX)
Input surge
protection devices,
monitored (-SX)
Input varistors
Description
The inverter starts and stops automatically based on the amount of
solar radiation. It connects to and disconnects from the electrical grid
automatically according to country requirements. The inverter monitors
itself and generates information to the user.
The inverter has a short-circuit diode between the DC terminals to
protect the internal electronics from reverse voltages. The inverter
informs the user of a reversed DC connection.
In accordance with VDE0126-1-1 and IEC62109-2, the inverter
monitors the impedance between the electrical ground and the DC
terminals before it connects to the electrical grid.
Maximum power point tracking. MPPT automatically operates the PV
generator, array, string or module at its maximum power point.
In accordance with VDE0126-1-1 and IEC62109-2, the inverter has a
DC and AC sensitive residual current monitoring unit (RCMU) which
measures the L1, L2 and L3 currents. If residual currents (DC or AC)
are detected, the inverter disconnects from the grid.
In accordance with VDE0126-1-1 and IEC62116, the inverter monitors
the voltage and frequency of the electrical grid. The inverter stops the
power conversion and disconnects from grid if a missing electrical grid
is detected (anti-islanding).
The inverter software has an over-current trip function. The inverter
informs the user if an over-current trip occurs.
If an external AC side short circuit occurs, the inverter disconnects from
the grid to protect its electronics.
If the inverter detects harmful internal temperatures, it temporarily limits
the output power. If the internal temperature rises to dangerous limits,
the inverter stops power conversion and disconnects from the grid.
The manual DC switch which isolates the PV array from the electrical
grid.
The string fuses protect the PV modules and string cabling against
earth faults due to installation errors or faulty components. There are
string fuses on both the negative and positive inputs.
String monitoring measures the current in each string and compares it
to the average current of selected strings. The feature gives a warning
when the current in one of the strings deviates from the average. You
can set the threshold value.
The surge protection device (SPD) protects the inverter from induced
voltage spikes, for example, from thunderstorms. The inverter monitors
the SPD and informs the user when it must be replaced.
Input overvoltage protection varistors which protect the inverter from
induced voltage spikes.