välijaotusjaamad

Välijaotusjaamad, often translated as intermediate distribution substations or simply intermediate substations, are key components in electrical power distribution networks. They serve to step down voltage from higher distribution levels to lower voltage levels suitable for direct consumption by industrial users, large commercial facilities, or smaller local distribution networks.

These substations are typically located in proximity to the end-users they serve, reducing the length of low-voltage distribution lines. This placement helps to minimize voltage drop and power losses. Unlike main substations that connect the transmission grid to the primary distribution network, välijaotusjaamad operate at a lower voltage hierarchy.

The primary function of a välijaotusjaam involves the use of transformers to reduce voltage. They receive power at a medium voltage, for example, 10 kV or 20 kV, and transform it to a lower voltage, such as 400 V or 6 kV. The exact voltage levels can vary depending on the specific country's power system standards and the requirements of the connected consumers.

In addition to voltage transformation, välijaotusjaamad also play a role in protecting the distribution network. They are equipped with protective relays, circuit breakers, and fuses to detect and isolate faults, preventing damage to equipment and ensuring the safety of the system. The design and capacity of a välijaotusjaam are determined by the anticipated power demand of the area it serves.