Transformers And Insulation Monitor For Tl Models; Grid Connection Transformer; Auxiliary Transformer - Ingeteam Ingecon Sun Power Series Installation Manual

Installation manual

5.3. Transformers and insulation monitor for TL models

5.3.1. Grid connection transformer

This section lists the technical characteristics of the grid connection transformer which converts the medium or high
supply voltage to the operating voltage of Ingecon® Sun Power TL units.
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 TL inverters connected to the inverter's low voltage winding must be synchronised.
See section 5.5.
3. MPPTs connected by Ingecon® Sun Power TL 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.
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 neutral of the low voltage winding must not be grounded.
9. The connection to the medium voltage network will be the nominal connection point.
10. We advise using transformers equipped with five-point voltage regulators, with the possibility of selecting
the following options:
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
The primary circuit is connected to the power input. We recommend installing protection and switching components
to protect this transformer.
The technical requirements of the auxiliary transformer are:
AAS2000IKI01
5% 2.5%
Sun Power
®
auxiliary
protections
auxiliary loads
0% -2.5% -5%
P S
grounding insulation
Ingeteam Power Technology, S.A.
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