FIELD: instrumentation engineering; three-phase single-ended insulated- or compensated-neutral supply mains.
SUBSTANCE: proposed method involves detection of first failed phase on occurrence of single-phase ground fault, disconnection of power-transmission line from power supply, shorting-out of first failed phase and conductor of second serviceable phase at certain distance in end of power transmission line, grounding of neutral point of power supply or lead of one of its serviceable phases, connection of power transmission line to power supply, and measurement of emergency parameters. Chosen out of emergency parameters are current through first failed phase, current through second serviceable phase, and phase angles of these currents relative to voltage between mentioned first and second phases. Distance to point of single-phase ground fault is found from expression interrelating mentioned parameters.
EFFECT: enhanced measurement accuracy, facilitated location of single-phase ground fault.
1 cl, 1 dwg
