Method for connecting an energy generation installation to a medium voltage network and energy generation installation

A photovoltaic installation, comprising:

• a photovoltaic (PV) inverter connected on an input side thereof to a photovoltaic generator and its output connected without a switch in-between to a low-voltage side of a medium-voltage transformer,
• a capacitive voltage divider arranged on a medium-voltage side of the medium-voltage transformer configured to detect first voltage values,
• a voltage detection means arranged on the low-voltage side of the medium-voltage transformer for detecting second voltage values,
• a circuit breaker arranged on the medium-voltage side of the medium-voltage transformer and configured to connect the output of the PV inverter to a medium-voltage grid,
• a calibration unit configured to adjust the first voltage values to the second voltage values during the idle state of the medium-voltage transformer,
• a controller configured to actuate the circuit breaker when voltage values detected at the capacitive voltage divider and adjusted by the calibration unit exceed a first threshold value.