%0 Electronic Article %A Qiang Huang %A Guibin Zou %A Chunhua Xu %A Jie Zhang %A Shuo Zhang %K EMTDC %K internal faults %K short-circuit fault characteristics %K dc transmission line protection method %K TP %K fault voltage %K PSCAD %K external faults %K single-end protection scheme %K current-limiting reactors %K four-terminal symmetrical bipolar HVDC grid %K abrupt changing point %K multilevel converter-based HVDC grid %K transition period %K transient voltages %K MMC %K fast single-end line protection method %K meshed multiterminal HVDC grid %K protection technique %X In view of the short-circuit fault characteristics, the protection technique of the dc lines limits the development of the modular multi-level converter (MMC)-based HVDC grid in a large extent. This study derives the calculation formulas of the transient voltages of internal and external faults and proposes a single-end protection scheme based on the transition period (TP) from the abrupt changing point to the first extreme point of the fault voltage. Due to the current-limiting reactors, the TP of the internal fault is much shorter than that of the external fault, which is used to discriminate internal fault from external fault. A four-terminal symmetrical bipolar HVDC grid based on MMC is modelled using PSCAD/EMTDC, and simulation results demonstrate the validity of the new proposed dc transmission line protection method. %T Fast single-end line protection method for the meshed multi-terminal HVDC grid %B The Journal of Engineering %D March 2019 %V 2019 %N 16 %P 1602-1606 %I Institution of Engineering and Technology %U https://digital-library.theiet.org/;jsessionid=2gkjgkeo2ku13.x-iet-live-01content/journals/10.1049/joe.2018.8722 %G EN