System for discriminating kinds of surges on power transmission lines

A system for discriminating a kind of a surge on a power transmission line and for locating a place on the power transmission line where the surge occurred, said system having at least one master station and at least one slave station,

• each of said master and slave stations being connected to said power transmission line and being located at one or more ends of said power transmission line, and each of said stations including receiving means for receiving surges which occur on the power transmission line,
• said master station further comprising:
• calculation means for calculating a time difference between a first time when the surge was received by said receiving means of said master station and a second time when the surge was received by said receiving means of said slave station, and
• locating means for locating a place on the power transmission line where the surge occurred based upon said time difference, and
• one of said stations comprising:
• an analog-to-digital converter for digitizing into a digital signal said surge received by said surge receiving means of said one station;
• extraction means for extracting from said digital signal obtained by said analog-to-digital converter information representative of the surge waveform;
• memory means for storing predetermined reference information concerning the nature of surges;
• and
• discriminating means for comparing said information representative of the surge waveform obtained by said extraction means with said reference information stored in said memory means to discriminate the kind of surge.