Sähköasemilta

Sähköasemilta refers to electrical substations in Finnish. Electrical substations are a critical part of the electricity transmission and distribution network. They serve as intermediate points between high-voltage transmission lines and lower-voltage distribution lines that deliver power to consumers. The primary function of a substation is to transform voltage levels up or down as needed.

Within a substation, various equipment plays key roles. Transformers are essential for changing voltage. Switchgear, including circuit breakers and disconnect switches, allows for controlling and isolating parts of the electrical system for maintenance or in case of faults. Relays and protective devices monitor the system and trigger actions to prevent damage. Capacitors and reactors are often used to regulate voltage and improve power factor.

Substations are categorized by their function. Transmission substations connect high-voltage transmission lines, stepping voltage down for further distribution. Distribution substations are located closer to consumers, further reducing voltage to levels suitable for residential, commercial, and industrial use. Mobile substations are temporary installations used for emergency power or during maintenance of permanent facilities.

The design and operation of electrical substations are governed by stringent safety regulations to protect personnel and the public, as well as to ensure the reliability of the power supply. They are typically unmanned and remotely monitored, with maintenance performed by specialized technicians. The efficient and safe operation of sähköasemilta is vital for the functioning of modern society.