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美国Amtrak公司东北走廊在纽约和华盛顿之间的接触网采用单相交流12kV 25Hz电流制。沿线有向牵引变电所供电的二相交流138kV 25Hz架空输电线。各种供电源又与这根输电线连接。在东北走廊的线路改造中,在费城里士满建造了世界上最大的静止变频装置。这个装置由5组额定容量各为36MW/45MVA的相同的变频单元组成,向架空输电线输送180MW/225MVA的电能。该装置于2002年7月投入运行。
US Amtrak Northeast Corridor in New York and Washington, the contact network using single-phase AC 12kV 25Hz current system. Two-phase AC 138kV 25Hz overhead transmission line powered by directional traction substation along the line. A variety of power supply is connected with this power transmission line. In the northeastern corridor of the line reconstruction, in Richmond, Philadelphia built the world’s largest static frequency conversion device. This unit consists of five identical frequency conversion units each rated at 36MW / 45MVA and delivering 180MW / 225MVA of electricity to overhead power lines. The unit was put into operation in July 2002.