suurjänniteverkon

Suurjänniteverkko, meaning high-voltage grid in Finnish, refers to the network of power lines that transmit electricity at very high voltages. This is a crucial component of a country's electrical infrastructure, responsible for efficiently transporting large amounts of power from generation sources, such as power plants, to distribution substations where the voltage is stepped down for local use. The high voltage is used to minimize energy loss during long-distance transmission; power loss is proportional to the square of the current, so by increasing voltage, current can be decreased for the same amount of power, thus significantly reducing resistive losses in the transmission lines.

These grids operate at voltages typically ranging from tens of thousands of volts up to several hundred thousand volts. The infrastructure involves large pylons supporting thick conductors, as well as substations equipped with transformers and switching equipment. The maintenance and operation of the suurjänniteverkko are complex undertakings, requiring specialized knowledge and technology to ensure reliability and safety. The planning and expansion of these networks are also strategic decisions, influenced by factors such as energy demand, renewable energy integration, and national security. In Finland, the responsible operator for the high-voltage transmission grid is Fingrid Oyj.