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VDE AR-N ​

This section explains how to evaluate a connection request according to the VDE AR-N methodology, based on the standards AR-N 4100, AR-N 4105, and AR-N 4110.

Evaluation Methodology ​

The VDE AR-N connection request evaluation assesses grid interferences using the VDE AR-N rules. Calculations rely on short circuit power, which is determined using the short circuit project settings and the maximum three-phase short circuit power at the supply terminal (or point of common coupling, if defined). Generator short circuit current contribution is always enabled, regardless of the settings.

This tool functions similarly to the D-A-CH-CZ tool. For further guidance, refer to the D-A-CH-CZ help system.

Status ​

Each connection request can be assigned a status, which determines its inclusion in static or time series simulations. The available statuses are:

  • Pending (OFF): Default status upon creation. The request is under evaluation.
  • Canceled (OFF): The request has been canceled by the client.
  • Approved (ON): Approved without requiring any measures.
  • Approved with measures (ON): Approved with required grid or device-side measures.
  • Built (ON): Physically built but not yet added to the customer list; still considered in simulations.
  • Closed (OFF): Built and added to the customer list.

Grid Upgrades and Connection Requests ​

Grid upgrades and connection requests are applied to the grid based on their status before simulations begin. They are integrated into the grid model in the order selected and influence the simulation accordingly.

The displayed grid adapts to reflect the selected upgrades and requests. If any cannot be applied (e.g., due to missing grid elements), they are deselected, and a warning is shown.

To modify the default selection, simply select or deselect items from the list. Your selection is saved for the session, even when navigating to other simulations. Reloading the page or clicking refresh will restore the default selection.