Multiple point HV DC transmission system - has several rectifier annaand inverter stations connected in series by ring line

摘要

A multiple point high voltage d.c. transmission system has rectifiers and inverters connected with three phase networks. Current and/or voltage controllers and a signalling device are allocated to these rectifier and inverter stations. A d.c. two-wire line interconnects all stations. Each station has switches in both d.c. wires, and a transverse link with switches between the wires. Each station has a shunting switch in a connecting wire between the transverse links.