External Disconnection Device; Medium Voltage Transformer - Ingeteam INGECON SUN 160TL Manuel D'installation

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The stray capacity of the PV array must always be lower than:
• 11.3 μF if it is connected to a 50 Hz grid.
• 9.4 μF if it is connected to a 60 Hz grid.
The inverter cannot operate with grounded PV arrays; the PV array must be isolated.
The stray capacity depends mainly on two factors:
• Installation factors (structure, ceiling, etc.), inclination, manufacture of the photovoltaic module, type of
module.
• Environmental factors: humidity, rain, etc.
The installer is responsible for ensuring that the PV array does not exceed these limits, to ensure the correct
operation of the inverter.
If said levels are exceeded, the inverter may stop due to the limit of rms residual current established by regulation
IEC 62109.

5.8. External disconnection device

The DC and AC supply must be shut off for equipment inspection work. To do this, the installer must fit an external
disconnection device.

5.9. Medium voltage transformer

In installations where the use of a medium voltage transformer dedicated to the inverters is required, this
transformer must meet the following requirements:
• The transformer must have a rated power equal to or greater than the sum of the power of the inverters
installed downstream.
• The transformer must have a star configuration in the low-voltage side and a delta configuration in the
high-voltage side.
• It is recommended to use transformers with Ucc <6%.
• It is recommended to use transformers equipped with five-point voltage regulators (0, ±2.5, ±5%).
• The transformer low-voltage side must withstand an earth fault current at three times the grid frequency
in the range of 10 Arms/MVA.
• The dimensioning of the transformer must take into account:
• The power cycles of the photovoltaic application.
• The voltage and frequency characteristics (and their tolerances) of the connection point.
• The regulations of the country where it is to be installed.
• The environmental factors of the installation location (temperature, humidity, altitude, etc.).
• The transformer is an essential part of the installation; its features must be taken into account when
designing the necessary downstream protections.
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Preparation for installing the unit
ABZ2011IQM01_C- Installation and Operation Manual