Unit Description; Overview; Optional Accessories - Ingeteam INGECON SUN String Control 320 Handbuch Für Montage Und Betrieb

Ingeteam

2. Unit description

2.1. Overview

The INGECON SUN String Control has various functions.
Firstly it acts as a grouping box for strings, in which up to 16 strings from the PV array are placed in parallel.
Secondly it includes a series of fuses and fuse holders, which protect the installation and enable the switching of
the PV array (the fuse holders must never be opened when powered).
Finally, this unit carries out readings of the currents carried by each string, triggering an alarm in the event that a
string has an anomalous current and sending information on the production of each string.
When the inverter starts up and injects power into the grid, the PV array current crosses the INGECON SUN String
Control. This then starts to measure the currents that pass along each string, comparing them, and detecting any
currents that are out of range.
Detection of an anomalous current
Periodically the unit measures each string and calculates the average current of all the strings weighting them
by their rated current. Then a calculation is made of the deviation of each string with respect to the weighted
average. If the deviation of any of the strings exceeds the percentage defined in the configurable parameter average
deviation %, then it is considered that the string has an anomalous current. If the current of this string stays above
the average deviation % over a time greater than the Time before alarm the unit generates an Anomalous current
alarm.
The process of detecting anomalous flows begins when the average current exceeds the larger of two values: 0.5 A
or 10% of the rated current of the strings. This is done to filter alarms in periods of very low radiation or at sunrise
and sunset.
Detection of blown fuse
This unit does not have hardware for blown-fuse detection, but it evaluates the currents and under certain
conditions deems there to be a possibility that the fuse is blown.
The unit deems a string to have a blown fuse when its current does not exceed 2% of its nominal current while the
average for the rest of the unit exceeds 20% of the nominal current of the installation.
As can be inferred from these conditions, the unit deems a fuse to be blown when the string has zero-current (with
a safety margin) and the rest of the installation is in production. For this reason this fault may not be a blown fuse
but a connector without good contact, or a cable cut in the installation, etc.

2.2. Optional accessories

Isolating switch
Optionally the INGECON SUN String Control can be equipped with a DC isolating switch.
Isolating switch with communication-assisted tripping
Optionally the INGECON SUN String Control can be equipped with a DC isolating switch with communication-
assisted tripping.
DC surge arresters
These units have the option of incorporating surge arresters that, in the event of voltages higher than 1000 VDC,
route the voltage to ground as a protection measure.
Communication accessories
There are two distinct options for communicating the units.
RS-485
Ethernet
GSM/GPRS
See the corresponding Communication accessories manual for more information on the different possibilities.
44 AAS2011IQM01_ - Installation and usage manual
Unit description