A method of handling faults on power lines in a DC, direct current, power system comprising at least two converters (CONV 1, CONV 2, CONV 3) in corresponding converter stations (12, 14, 16) connected to different DC power lines, where each converter station is connected to a number of DC power lines (L1, L2, L3) at least one of which is a power line in the DC power system and each connection is made via at least one line separating device (LS1, LS2, LS3, LS4, LS5, LS6, LS7, LS8, LS9), the method being performed in a fault handling arrangement and comprising upon the detecting of a fault of a first power line in the DC power system interconnecting a first converter (CONV 1) in a first converter station with a second converter (CONV 2) in a second converter station, where the first power line is connected to the first converter (CONV 1) via a first line separating device and to the second converter (CONV 2) via a second line separating device, operating the first line separating device in cooperation with operation of the second line separating device to disconnect the first power line from the DC power system, operating at least one further line separating device, of the first converter station for isolating the first converter station from the DC power system, investigating if the fault has been cleared, after the second line separating device has been operated for separating the first power line from the second converter station while power lines between the second converter station and any other converter station are operational, and operating the first line separating device in cooperation with operation of the second line separating device to reconnect the first power line and said at least one further line separating device of the first converter station to again connect the first converter station to the DC power system if the fault has been cleared and otherwise permanently disconnecting the first power line and reconnecting the first converter station to the DC power system. upon the detecting of a fault of a first power line in the DC power system interconnecting a first converter (CONV 1) in a first converter station with a second converter (CONV 2) in a second converter station, where the first power line is connected to the first converter (CONV 1) via a first line separating device and to the second converter (CONV 2) via a second line separating device, operating the first line separating device in cooperation with operation of the second line separating device to disconnect the first power line from the DC power system, operating at least one further line separating device, of the first converter station for isolating the first converter station from the DC power system, investigating if the fault has been cleared, after the second line separating device has been operated for separating the first power line from the second converter station while power lines between the second converter station and any other converter station are operational, and operating the first line separating device in cooperation with operation of the second line separating device to reconnect the first power line and said at least one further line separating device of the first converter station to again connect the first converter station to the DC power system if the fault has been cleared and otherwise permanently disconnecting the first power line and reconnecting the first converter station to the DC power system.