Pulse reflection type fault location device utilizing a dark-trace tube display

Claim 1

A device for the location of faults at the instant of occurrence thereof in a power transmission line provided with protective relays, said device comprising: a trigger unit including an input connected to said protective relays, said trigger unit including an output and being adapted to generate at said output, upon operation of said protective relays, a short duration voltage pulse; a record-duration control unit adapted for controlling record duration of probing pulses and pulses reflected from a fault, said further unit including an input connected to the output of said trigger unit and including and being adapted to generate at an output with a preset time delay a positive rectangular pulse of predetermined duration; a syncpulse unit connected to the output of said record-duration control unit and including and being adapted to generate at a plurality of outputs, during presence at the input thereof of said positive rectangular pulse, a series of short synchronizing pulses following each other at uniform intervals; a transmittedpulse generator unit including an input connected to one of the outputs of said sync-pulse unit and including an output connected to said power transmission line, said transmitted-pulse generator unit being adapted to generate synchronously with each pulse generated by said sync-pulse unit a probing pulse transmitted to said power transmission line; an amplifier including an input connected to said power transmission line and including and being adapted to generate at an output amplified probing and reflected pulses; a calibration-marker unit including an input connected to one of the outputs of said sync-pulse unit and including and adapted to generate at an output a set of calibration markers synchronously with each pulse generated by said sync-pulse unit; a time-base unit including an input connected to said sync-pulse unit and including and adapted to generate at an output a sawtooth wave synchronously with each pulse generated by said syncpulse unit; a dark-trace tube including vertical and horizontal deflection coils and a modulator connected to the output of said record-duration control unit; said vertical deflection coil being connected to the output of said amplifier and to the output of said calibration-marker unit; said horizontal deflection coil being connected to the output of said time-base unit; said darktrace tube including and being adapted to provide for recording and displaying on a screen, as a dark image, said probing and reflected pulses along with the calibration markers whereby provision is made for a subsequent determination of the distance to the fault in said power transmission line.

Claim 2

A device for the location of faults at the instant of occurrence thereof in a power transmission line provided with protective relays, said device comprising: a trigger unit including an input connected to said protective relays, said trigger unit including an output and being adapted to generate at said output, upon operation of said protective relays, a short duration voltage pulse; a record-duration control unit adapted for controlling record duration of probing pulses and pulses reflected from a fault, said further unit including an input connected to the output of said trigger unit and including and being adapted to generate at an output with a preset time delay a positive rectangular pulse of predetermined duration; a syncpulse unit connected to the output of said record-duration control unit and including and being adapted to generate at a plurality of outputs, during presence at the input thereof of said positive rectangular pulse, a series of short synchronizing pulses following each other at uniform intervals; a transmittedpulse generator unit including an input connected to one of the outputs of said sync-pulse unit and including an output connected to said power transmission line, said transmitted-pulse generator unit being adapted to generate synchronously with each pulse generated by said sync-pulse unit a probing pulse transmitted to said power transmission line; an amplifier including an input connected to said power transmission line and including and being adapted to generate at an output amplified probing and reflected pulses; a calibration-marker unit including an input connected to one of the outputs of said sync-pulse unit and including and adapted to generate at an output a set of calibration markers synchronously with each pulse generated by said sync-pulse unit; a time-base unit including an input connected to said sync-pulse unit and including and adapted to generate at an output a sawtooth wave synchronously with each pulse generated by said syncpulse unit; a dark-trace tube including vertical and horizontal deflection coils and a modulator connected to the output of said record-duration control unit; said vertical deflection coil being connected to the output of said amplifier and to the output of said calibration-marker unit; said horizontal deflection coil being connected to the output of said time-base unit; said darktrace tube including and being adapted to provide for recording and displaying on a screen, as a dark image, said probing and reflected pulses along with the calibration markers whereby provision is made for a subsequent determination of the distance to the fault in said power transmission line.