Ingeteam INGECON SUN PowerMax TL U B 1000 Vdc Series Installation And Operation Manual page 54

Ingeteam
2. If connecting the equipment to the transformer's same low voltage winding, these must be synchronized. These
equipment have all the necessary elements to synchronize up to four inverters.
INFO
See section "13. Connection of the DCAC connections module" to proceed with connection.
3. PV fields connected by these inverters to the same transformer must have the same voltage settings.
4. The short circuit voltage of a transformer should not be greater than 8% between the primary winding and
secondary winding(s).
5. We recommend inserting a grounded metal screen between the high voltage winding and low voltage
winding.
6. The low voltage winding must withstand pulsating voltage components with dU/dt of 500 V/uS voltage.
Because of inverter operation, the voltage between a phase and ground can reach 3/2 of the open circuit
voltage of the PV array.
7. We recommend using the Dy11 connection.
8. The connection to the medium voltage grid will be the nominal connection point.
9. We advise using transformers equipped with five-point voltage regulators, with the possibility of selecting
the following options:
10. The impedance of the inverter's transformer (Zmv) must be calculated according to the breaking capacity
of the inverter's thermomagnetic circuit breaker. Depending on the AC voltage of the inverter, its
thermomagnetic circuit breaker supports the following rated short circuit current (Ik):
The following table outlines the transformer's short circuit voltage according to the inverter's AC voltage
and the number of inverters connected to the same transformer. The transformer's short circuit voltage
(Ucc) must be equal to or greater than the ones shown in the following table:
AC voltage
Up to 450 Vac
460 ~ 690 Vac
No electronic equipment may be connected to the power grid. All auxiliary loads must be isolated from the power
grid via a galvanically isolated transformer, as shown in the section "6.8.2. Auxiliary transformer".
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5% 2.5%
AC voltage
Up to 450 Vac
460 ~ 690 Vac
Minimum Ucc depending on the number of inverters connected to the same transformer
1 inverter
1.9%
2.3%
Low Voltage / Medium
Voltage
0% -2.5%
Ik
85 kA
65 kA
2 inverters 3 inverters
3.8% 5.6%
4.6% 6.9%
ABK2027IQE01_A - Installation and Operation Manual
Preparation for installing the unit
-5%
4 inverters
7.5%
9.2%