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C013C7
7 - Appendix
P
rotective devices within the inverter
Anti-Islanding
In the event of a local grid outage from the utility company, or when the equipment is switched off for maintenance
operations, the inverter must be physically disconnected safely, to ensure protection of people working on the
grid, all in accordance with the relevant national standards and laws. To prevent possible islanding, the inverter
is equipped with an automatic protective disconnection system called an Anti-islanding system.
Grounding/differential protection fault
The inverter has a sophisticated ground protection circuit that continually monitors the ground connection for
significant changes in fault current. when a ground fault current sufficient to cause safety hazards is detected,
this circuit shuts down the inverter and illuminates a red LED on the front panel indicating a ground fault condi-
tion. The inverter is equipped with a terminal for the system ground conductors.
Arc Fault Detection (AFD)
This safety function allows the inverter to recognize electrical arcing on DC cables. Once the arcing has been
detected the inverter will fall into secure state. The inverter will remain in this disconnected state even after
turning it off and on again.
It is possible to unlatch the unit by pressing the ‘ESC’ button on the display after a complete check of DC ca-
bles. The AFD board performs a safety Self-Test at each start-up providing the result of the test on the inverter
display.
Additional protective devices
The inverter is equipped with additional protective devices to guarantee safe operation in any circumstance.
These protective devices include:
•
Continuous monitoring of the grid voltage to ensure the voltage and frequency values stay within operating
limits.
•
Control of internal temperatures to automatically limit the power if necessary to ensure the unit does not
overheat (derating).
T
opographic diagram of the equipment
The input of a photovoltaic (PV) inverter is intended to be connected to a PV array. The input circuitry includes
Maximum Power Point Tracking (MPPT) circuitry, which maximizes the output of the PV array under all
allowable environmental conditions.
All models are provisioned with two independent inputs, each equipped with its own MPPT circuit that enables
the inverter to be connected to two independent arrays that are maximized for output power individually. See
block diagram figure on next page. The main segments of the design are the independent input DC-DC
converters (termed ‘boosters’, one for each MPPT channel) and the main output inverter. Both of the DC-DC
converters and the output inverter operate at a high switching frequency to enable a compact design and low
weight.
These versions of ABB inverters utilize “high-frequency switching” transformers, to provide a high-level of gal-
vanic isolation between inverter input (array) and output (grid). This circuitry provides galvanic isolation from
the secondary (AC side), while maintaining very high performance in terms of energy yield and export. An in-
verter with two independent input DC-DC converters; each converter is typically dedicated to a separate array
and has independent Maximum Power Point Tracking (MPPT) circuitry and control. This means that the two
Содержание PVI-3.0-TL-OUTD-S-US
Страница 1: ...ABB solar inverters Product manual PVI 3 0 3 6 3 8 4 2 TL OUTD S US A 3 0 to 4 2 kW ...
Страница 16: ... 16 3005CC2 2 Installation location ...
Страница 32: ... 32 3007CC3 3 Mounting and wiring ...
Страница 62: ... 62 C011C5 5 Troubleshooting ...
Страница 66: ... 66 C012C6 6 Maintenance ...
Страница 72: ... 72 C013C7 7 Appendix Output power with one DC section operating ...