FIELD: relay protection of electrical network lines shorted out by parallel or by-pass links.
SUBSTANCE: proposed method includes addition of currents through sensors at end of interest of line under protection to currents through sensors at closest ends of other parallel and by-pass links of electrical network shorting out line under protection; connection of relay measuring element to sum of mentioned currents; measurement of these currents and their comparison with rated setting for desired period of time, whereupon potential operating signal is produced for disconnecting current flowing through current sensor of line under protection to short-circuited point by means of circuit-opening device at mentioned end of line under protection.
EFFECT: enhanced sensitivity of time-delay current cutoff for lines shorted out by parallel or by-pass links.
1 cl, 2 dwg
