Busbar protection device for electric station in 3 / 2 scheme with eight connections

Abstract

The invention relates to electrical engineering, specifically relay protection, and can be used as a busbar protection device for power plants in a 3 / 2 circuit with eight connections. The technical result consists of preventing the shutdown of units and the complete loss of power at the power plant during a short circuit on the busbar in the event of a failure of one of the busbar circuit breakers and its circuit breaker failure backup device. A device for protecting busbars of an electric power station in a 3 / 2 scheme with eight connections, containing four generator-transformer units - first, second, third, fourth, four lines - fifth, sixth, seventh, eighth, the first bus - nine with four switches - ten, eleven, twelve, thirteen, the second bus - fourteen with four switches - fifteen, sixteen, seventeen, eighteen, switch - nineteen of the middle row, connected between the first line-five and the first generator-transformer-one unit, switch-twenty of the middle row, connected between the second line-six and the second generator-transformer-two unit, switch-twenty-one of the middle row, connected between the third line-seven and the third unit-three, switch-twenty-two of the middle row, connected between the fourth line-eight and the fourth unit-four, containing the measuring element-twenty-three for bus protection, four relays - twenty-four, twenty-five, twenty-six, twenty-seven positions of the "On" bus switches, four three-input I elements - thirty-two, thirty-four, thirty-six, thirty-eight with inverted input, four "Time" elements - thirty-three, thirty-five, thirty-seven, thirty-nine, six intermediate relays - forty-one, forty-two, forty-three, forty-four, forty-five with normally closed contacts. Economic effect: a large number of consumers will not lose power.