A valve
short circuit fault classification and positioning method of a high-
voltage direct current transmission converter comprises the steps: a, if a high-
voltage direct current transmission
protection system determines that a converter has valve
short circuit faults, the processor of a
protection system reads current magnitude information collected by a current
measurement device in a sampling window; b, the processor performs integration calculation of section
electric charge quantity and
branch electric charge quantity differences; c, the processor distinguishes the
alternating current side short of the converter, the bridge arm
short circuit and the
direct current outgoing line short circuit according to the size relation of each section
electric charge quantity; and d, if the bridge arm short circuit happens, the processor further locates a fault bridge arm according the sizes of the
branch electric charge quantity differences and the direction of the
alternating current branch current. The method provided by the invention can rapidly classify positioning valve short circuit faults to facilitate rapidly and effectively
processing faults and prevent accidents from being enlarged; and the method provided by the invention is not influenced by fault moments,
noise and the length of the sampling window, and is low in sampling rate requirement and good in adaptability.