Val av spänning och frekvens i den svenska järnvägens kontaktledningar
For historical reasons, Swedish railways use 15 kV/16? Hz overhead contact lines for train traction, while the most common standard worldwide is 25 kV/50-60 Hz. This leads to higher investment costs for railway conversions and expansions, and to greater energy losses in the distribution of electricity to the trains. Yet to get away from these drawbacks by investing in a 25 kV/50 Hz overhead contac
