Distributionslinje

Distributionslinje is a component of an electrical distribution network that carries electricity from distribution substations to end users. It forms the lower-voltage portion of the grid, typically operating at medium voltage or low voltage depending on the country. In many regions MV distribution lines carry around 10–35 kilovolts and step down to 0.4 kilovolts (400 V) or 230 V at the customer connection via distribution transformers.

Distributionslinje can be implemented as overhead lines on poles or as underground cables. Overhead lines use poles, conductors, and insulators, while underground cables are laid in conduits. Conductors are usually aluminum or copper. Protective devices such as fuses or reclosers isolate faults and help restore supply quickly. The distribution network is typically radial, delivering power from a single or a few sources to customers, though looped configurations exist to improve reliability.

The operator of a distributionslinje is typically a distribution system operator (DSO), responsible for planning, operation, maintenance, fault response, voltage regulation, and reliability. Connections to customers require compliance with grid codes and safety standards. Design choices depend on geography, load density, climate, and resilience requirements, balancing cost, ease of maintenance, and vulnerability to outages.

Distributionslinje is distinct from high-voltage transmission lines, which move electricity over long distances at higher voltages, and from the service line that connects the distribution network to individual buildings.