Measuring Equipment Connected To The Power Grid - Ingeteam INGECON SUN PowerMax TL B Series Installation And Operation Manual

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The auxiliary transformer transforms the voltage from the power part of the unit to its control and current part.
The primary circuit is connected to the power input. We recommend installing protection and switching
components to protect this transformer.
In the event of using a residual current device between the transformer secondary connected to ground and the
auxiliary loads of the unit, said device shall be 300 mA, of industrial use, a selective version and super immune.
The technical requirements of the auxiliary transformer are:
• The transformer's power should be suitable for the loads connected to it, taking the site environmental
conditions into account. The minimum power value is 4700 VA per inverter.
• The power winding must withstand pulsating voltage components with dU/dt of 500 V/uS. Because of
inverter operation, the voltage between a phase and ground can reach 3/2 of the open circuit voltage of
the PV array.
• Delta connection is advised in the power part and star connection in auxiliary loads.
• We recommend connecting the neutral of the auxiliary loads to ground.

6.9. Measuring equipment connected to the power grid

All measuring devices connected to the power grid (wattmeters, meters, etc.) should be isolated from the grid by
voltage transformers, current transformers, etc.
50
L1
L2
L3
I> I> I>
Auxiliary transformer
Residual current device
L1 L2 L3 N
Auxiliary consumptions
Preparation for installing the unit
Medium voltage transformer
Circuit breaker (characteristic
L, I)
ABQ2026IQE01_A - Installation and Operation Manual
L1
L2
L3