Netzkontor GmbH

The Medium-Voltage Grid Explained

The medium-voltage grid serves as the central link between the supraregional high-voltage level and the local low-voltage supply. With voltages ranging from 10 kV to 30 kV, it forms the distribution layer that efficiently transmits electricity over medium distances—for example, from substations to industrial facilities or to transformer stations in residential areas.

Function and Importance of the Medium-Voltage Grid

The medium-voltage grid is responsible for transmitting electrical energy from the higher-level high-voltage grids to consumers in cities and rural areas. It supplies not only households but also commercial and industrial facilities, hospitals, and other institutions with high energy demands. It also serves as a feed-in level for decentralized energy generators, such as wind and solar power plants, that feed their electricity into the grid. 

Structure and Technology of the Medium-Voltage Grid

Medium-voltage grids typically operate with three-phase alternating current. They consist of a combination of overhead lines and underground cables, with the choice of installation method depending on factors such as terrain and environmental regulations. Substations convert the medium voltage to the low voltage of 400/230 V required by end users. 

Challenges and Future Prospects

With the increasing expansion of renewable energy and decentralized power generation, the demands on the medium-voltage grid are growing. It must become more flexible and intelligent in order to efficiently control power flows and ensure grid stability. Modern grid control technology and digitalization play a crucial role in this regard.