Technical requirements for medium-voltage connections and their significance for renewable energies
The standard VDE-AR-N 4110 defines the technical requirements for connecting generation systems to the medium-voltage grid. It is of central importance for the integration of renewable energies and ensuring grid stability. In this article, we highlight the most important aspects of VDE-4110, its significance for medium-voltage systems and the relationship with the related standards VDE 4105 (low voltage) and VDE 4120 (high voltage).
What is VDE-AR-N 4110?
Technical connection rule medium voltage. VDE-AR-N 4110 is a technical connection regulation (TAR) that applies to customer installations in the area of the Medium voltage applies. Among other things, it regulates the planning, construction, operation and modifications of such systems. This standard implements the European requirements of the Network Code "Requirements for Generators" (RfG) in Germany and ensures that decentralised generation systems contribute to stable grid operational reliability.
Important requirements of VDE-4110:
- Grid connection conditions:
- Clear specifications for voltage levels, reactive power and Grid stability.
- Requirements for behaviour in the event of grid faults, such as passing through voltage dips.
- Certification procedure:
- Simplified verification for systems between 135 kW and 950 kW since the 2023 update
- Issue of a simplified system certificate C instead of comprehensive certifications.
- Relevance for Transformer compact stations:
Our transformers are the ideal solution for implementing VDE-AR-N 4110, offering high efficiency and reliability when integrating decentralised energy sources.
VDE 4105 and VDE 4120 in comparison:
VDE-AR-N 4105:
This standard is aimed at the connection of generation systems to the Low-voltage grid. It is particularly relevant for small PV systems and households.
VDE-AR-N 4120:
This regulation applies to installations in the High voltage range and emphasises robust technical standards for large industrial plants and energy parks.
For companies operating in the Medium voltage range The VDE-4110 requirements are of central importance for the safe and efficient utilisation of our transformer stations.
Conclusion
VDE-AR-N 4110 is a key document for the planning and operation of medium-voltage systems. With its clear specifications on grid stability and simplified certification procedures, it contributes to the efficient integration of renewable energies. Customers who work with medium-voltage systems can rely on our Compact transformer stations to safely fulfil the requirements of VDE-4110. For further information, please do not hesitate to contact us. Contact us or visit our website for detailed insights into our solutions.
Frequently asked questions about VDE 4110
What does VDE-AR-N 4110 regulate?
Technical connection rules for medium voltage. VDE-AR-N 4110 regulates the technical requirements for the connection of generation systems to the medium-voltage grid. It includes specifications on grid connection conditions, grid stability, certification procedures and requirements for decentralised energy generation systems.
What are the differences between VDE 4105, VDE 4110 and VDE 4120?
VDE 4105: Applies to generation systems in the low-voltage range, e.g. households and small PV systems.
VDE 4110: Aimed at systems in the medium voltage range, such as industrial applications and large decentralised generators.
VDE 4120: Refers to systems in the high-voltage range and focusses on large industrial plants and energy parks.
What role do transformers play in the implementation of VDE 4110?
Transformers are essential to ensure a safe connection to the medium-voltage grid. Our Compact transformer stations fulfil all the technical requirements of VDE-4110 and at the same time offer high efficiency and reliability.
How does the inverter work within a photovoltaic system?
The inverter is the central element of a photovoltaic system, which converts the direct current (DC) generated by the solar modules into alternating current (AC). The latter is required for the operation of household appliances or for feeding into the public power grid. Once the solar energy has been converted into electrical energy by the solar modules, the direct current generated is passed on to the inverter. Here, the direct current is converted into a sinusoidal alternating current whose frequency and voltage correspond to the values of the public grid. The inverter also monitors the output of the photovoltaic system and ensures optimum energy yield.
When is VDE-AR-N 4110 applicable?
VDE-AR-N-4110 must be applied when a generation system is connected to the medium-voltage grid. It applies to all relevant technical and operational requirements in the medium-voltage range.
When is VDE-AR-N 4105 applicable?
VDE-AR-N 4105 is used when a generation system is connected to the low-voltage grid, for example for smaller photovoltaic systems or systems for households.
When is VDE-AR-N 4120 applicable?
VDE-AR-N 4120 applies to systems that are connected to the high-voltage grid. It is relevant for large industrial projects and energy parks that feed in high power.
Reference to VDE Verlag:
"Further information on technical publications and electrical engineering standards can be found directly at VDE Publishing House."
Reference to the VDE website:
"You can gain a comprehensive insight into the Association of Electrical Engineering and the current technical regulations and standards at the official VDE website."
