Series capacitor and double conductors in the Swedish transmission system

AS THE WATER power resources in Sweden are located in the northern provinces, while the consumption is concentrated in the southern parts, the high-voltage network is characterized by large transmission distances. In the existing 220-kv network the average transmission distance is 300 miles and when all hydroelectric power has been developed the distance will have been increased to about 450 miles. This is the main reason why it has been found economical to introduce the higher transmission voltage of 380 kv.