Siirtöjohto

Siirtöjohto, often translated as power transmission line, refers to the electrical infrastructure used to transport large amounts of electrical energy over long distances. These lines are a critical component of the electricity grid, connecting power generation plants to substations and ultimately to distribution networks that serve end consumers. Siirtöjohto typically operates at high voltages, such as tens or hundreds of kilovolts, to minimize energy loss during transmission. The high voltage allows for lower current, and power loss is proportional to the square of the current, hence the reduction in loss.

The physical construction of siirtöjohto involves conducting wires, usually made of aluminum or copper, supported by large towers or pylons. These towers are spaced at regular intervals to maintain the tension and clearance of the wires. Insulators, made of materials like ceramic or glass, are used to prevent electrical current from flowing from the wires to the towers. Overhead lines are the most common type, but underground and submarine siirtöjohto also exist for specific applications where overhead lines are impractical or undesirable. Regular maintenance and inspection are essential to ensure the reliability and safety of siirtöjohto.