FIELD: electricity.
SUBSTANCE: invention is intended for successful automatic reclosure of the main circuit breaker (MCB) in the line without intermediate fault close-ins. Technical result lies in expansion of functionality by receipt of data on successful automatic reclosure of the MCB in the line without intermediate fault close-ins. According to the suggested method since occurrence of fault current surge the first countdown is started, which is equal to the delay time of the MCB protection actuation at that monitoring presence of fault current, when fault current disappears upon completion of the first countdown then the conclusion is made on the MCB closure; since the first countdown is over the second countdown is started, which is equal to the total delay time for all cycles of the MCB automatic reclosure, and sounding pulses are sent to all the line wires with a certain periodicity and the line parameters are defined upon disconnection of the fault current by identification of all reflection points and calculation of distances up to these points and by their comparison with parameters of the normal mode received in similar way in absence of the fault current; when the parameters do not coincide the signal is sent to the MCB automatic reclosure and the signal will be valid till the compared parameters are matched, and if it takes place before completion of the second countdown then delivery of sounding pulses is stopped, the prohibition is lifted and the signal is start foe automatic reclosure of the MCB.
EFFECT: when using the above method the data may be received on successful automatic reclosure of the main circuit breaker in the line without intermediate fault close-ins.
2 dwg
