FIELD: electricity.
SUBSTANCE: presented wire break protection device of a three-wire overhead power transmission line with an insulated neutral to which a step-down transformer is connected in series, a four-wire power line of electric network with grounded neutral and electric power consumers, has an emergency signal transmission channel connected in series with the microprocessor counter of electric energy to the control center of the electric networks. The microprocessor counter further comprises a unit for measuring mean-square linear voltages, a unit for calculating the voltage of inverse sequence, an inverse sequence voltage converter to logic signal with minimum voltage setting, a random operation excluding unit, a logic signal conversion unit to communication channel signal which transmits communication channel modem. In case of overhead line wire break of electric network with insulated neutral additional units of the microprocessor counter of electric power detect change of voltage of reverse sequence and transmit emergency signal of wire break of overhead line wire break of electric network with insulated neutral through transmission channel to the control center of the electric networks.
EFFECT: improved reliability of electric networks operation and improved electrical safety conditions.
2 dwg
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