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PDF Download: VDE-AR-N 4110 - The New Technical Connection Rules for Medium Voltage in Germany


What is VDE-AR-N 4110 and why do you need it?




If you are a customer or a generator operator who wants to connect your installation to the medium voltage grid in Germany, you need to comply with a set of technical rules that ensure the safe and reliable operation of the grid. These rules are defined by VDE, the Association for Electrical, Electronic & Information Technologies, in collaboration with network operators, plant operators, manufacturers, authorities, and other stakeholders. One of these rules is VDE-AR-N 4110, which specifies the technical connection rules for medium-voltage.




vde-ar-n 4110 pdf download



In this article, we will explain what VDE-AR-N 4110 is, what are its key requirements, how to comply with it for power generating plants, and how to download it as a PDF document. By reading this article, you will learn everything you need to know about VDE-AR-N 4110 and how it affects your installation.


VDE-AR-N 4110: Technical Connection Rules for Medium-Voltage




VDE-AR-N 4110 is an application rule that specifies the technical connection rules (TCR) for planning, erection, operation, and modification of customer installations that are connected at the grid connection point to the medium voltage grid of a network operator. Customer installations include reference and power generating plants, storages, and combined facilities of generation/demand/storage.


VDE-AR-N 4110 was published in October 2018 as part of the VDE FNN activities to prepare the system toward increasing feed-in of renewable energy in line with energy transition. It replaces, among others, the guidelines "Power Generation Plants at the Medium Voltage Grid" as well as the "Technical Connection Conditions for Medium-High Voltage" of 2008.


VDE-AR-N 4110 develops for the first time requirements of the European Network Code "Requirements for Generators" (RfG) for Germany entered into force in 2016. The RfG describes the grid connection requirements for generators at all voltage levels The main objectives of VDE-AR-N 4110 are to ensure the security and reliability of the medium voltage grid, to facilitate the integration of distributed energy resources, to harmonize the technical requirements across Germany, and to comply with the European standards and regulations.


Some of the benefits of VDE-AR-N 4110 are that it provides a clear and transparent framework for customer installations, it enables a more efficient use of the grid capacity, it supports the grid stability and resilience, and it fosters the innovation and competitiveness of the energy sector.


Key requirements of VDE-AR-N 4110 for customer installations




VDE-AR-N 4110 defines a number of technical requirements for customer installations that are connected to the medium voltage grid. These requirements cover aspects such as fault ride-through capability, reactive power provision, protection systems and settings, power quality, communication and data exchange, metering and monitoring, documentation and testing, and others.


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In this section, we will briefly describe some of the most important requirements of VDE-AR-N 4110 for customer installations. For a complete and detailed description of all the requirements, please refer to the official document of VDE-AR-N 4110.


Fault ride-through capability




Fault ride-through capability is the ability of a customer installation to remain connected to the grid and to support the grid recovery in case of a fault or disturbance. Faults can be caused by various events such as lightning strikes, short circuits, equipment failures, or switching operations. Faults can result in voltage dips or swells, frequency deviations, or phase shifts in the grid.


VDE-AR-N 4110 requires that customer installations must not disconnect from the grid during or after a fault, unless instructed by the network operator or for safety reasons. Customer installations must also provide dynamic grid support by injecting or absorbing active and reactive power according to predefined curves and parameters. The fault ride-through capability depends on the type and severity of the fault, as well as on the type and size of the customer installation.


Reactive power provision




Reactive power provision is the ability of a customer installation to generate or consume reactive power in order to regulate the voltage at the grid connection point. Reactive power is a component of the electric power that does not perform any useful work but is needed to maintain the voltage level and the power factor in the grid. Reactive power can be positive (capacitive) or negative (inductive).


VDE-AR-N 4110 requires that customer installations must provide reactive power according to predefined curves and parameters. The reactive power provision depends on the voltage level at the grid connection point, as well as on the type and size of the customer installation. Customer installations must also be able to switch between different modes of reactive power provision (such as constant power factor, constant reactive power, or voltage control) upon request by the network operator.


Protection systems and settings




Protection systems and settings are the devices and parameters that protect a customer installation and the grid from damages or hazards caused by faults or disturbances. Protection systems include relays, circuit breakers, fuses, switches, isolators, and others. Protection settings include thresholds, delays, curves, and others.


VDE-AR-N 4110 requires that customer installations must have adequate protection systems and settings that ensure the selective disconnection of faulty components or sections without affecting the rest of the installation or the grid. Customer installations must also coordinate their protection systems and settings with those of the network operator and other customers connected to the same grid. The protection systems and settings depend on the characteristics and configuration of the customer installation and the grid. How to comply with VDE-AR-N 4110 for power generating plants




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