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Ingeteam
5.3. Requirements for transformers and insulation monitor
5.3.1. Grid connection transformer (units without a transformer)
This section lists the technical features of the grid connection transformer which converts the medium or high supply
voltage to the operating voltage of the INGECON SUN Power U unit.
1.
The transformer's power must be greater than the sum of the power ratings of the connected inverters. Take
into account the environmental conditions of the site.
2.
INGECON SUN Power U inverters connected to the inverter's low voltage winding must be synchronized.
3.
MPPTs connected via INGECON SUN Power U to the same transformer must have the same voltage settings.
4.
The Ucc short circuit voltage of the transformer must be equal or less than 6%.
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.
7.
Because of inverter operation, the voltage between a phase and ground can reach 3/2 of the open circuit
voltage of the PV array.
8.
We recommend using the Dy11 connection.
9.
The neutral of the low voltage winding must not be grounded.
10. The connection to the medium voltage network will be the nominal connection point.
11. We advise using transformers equipped with five-point voltage regulators, with the possibility of selecting
the following options:
5%
No electronic equipment may be connected to the power grid. All auxiliary loads must be isolated from the power grid
through a transformer with galvanic isolation.
5.3.2. Auxiliary transformer
The auxiliary transformer transforms the voltage from the power part of the unit to its control and consumption part.
Ingecon
Sun Power U
®
36
2.5%
0%
Auxiliary
protection
220 ~ 240 Vac
60 Hz
-2.5%
P
S
Installation manual
-5%
ABB2000IKI01
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