FIELD: automatic control of power networks. SUBSTANCE: method designed to inhibit closure of substation automatic transfer switch in response to two-phase transient short circuit in double-ended distribution networks involves comparison of two reverse-sequence voltage surges with no- current interval of automatic rotary transfer switch incorporated in sectionalized circuit breaker; novelty is that time between short-circuit inrush currents and no-current interval of automatic transfer switch is compared for which purpose short-circuit current at bus section between bushing circuit breaker and automatic transfer switch center is recorded as soon as one of line voltages disappears and upon disconnection of automatic transfer switch disappearance of two line voltages caused by opening of bushing circuit breaker is recorded , no-current interval of automatic transfer switch is counted and if short-circuit current appears as soon as counting ceases, signal inhibiting closure of automatic transfer switch is supplied. So, presence of short-circuit current at outlet of transformer bushing circuit breaker and disappearances of one of line voltages across substation buses at this moment serves as unambiguous indication of short circuit across substation buses between bushing circuit breaker and automatic transfer switch center. Method is also designed to transmit inhibit signal to substation automatic transfer switch. EFFECT: enlarged functional capabilities; enhanced reliability. 2 dwg
