Netzleitung

Netzleitung is a system of conductive lines forming part of an electrical power network. It includes overhead transmission lines and underground or submarine cables that carry electric power between generation facilities, substations, and consumers. In transmission networks, Netzleitungen operate at high voltages to minimize losses, while distribution networks use lower voltages to reach end users.

Construction and forms: Overhead lines use steel-reinforced aluminium conductors, supported by towers and insulated with composite or glass/porcelain insulators. Underground cables are buried in ducts, with insulation and shielding to handle voltage and environmental exposure. Material choices depend on voltage, load, geography, and cost.

Electrical characteristics: The behavior is described by per-length resistance, inductance, capacitance, and conductance; surge impedance and propagation velocity govern fault currents and transients; corona discharge can occur at high voltages; losses include resistive I^2R heating and dielectric losses in cables; environmental and electromagnetic effects to consider.

Operation and planning: Netzleitungen require routing planning, right-of-way acquisitions, and protection systems; grid operators install switching stations and protection relays; maintenance ensures reliability and safety; standards by IEC and CENELEC govern design, testing, and operation.

Applications and types: Overhead lines are common for long-distance transmission; underground cables are used within cities or offshore contexts; submarine cables connect national grids.

Safety and environmental considerations: clearances, interference, EMI, land use; weather, icing, wind; installation and operation require permits and adherence to regulatory requirements to minimize risks to people and the environment.