Definitions for "15 k V AC"
V AC at 16.7 Hz is a railway electrification system used by Germany, Austria, Switzerland, Sweden, and Norway since 1912. The high voltage enables high power at low losses, while the lower frequency reflects technical limitations at the turn of the 20th century. In particular, the lower frequency reduces flashover problems in the motors, although at the cost of a non-standard line frequency requiring frequency conversion and separate supplies.