System and method for on-site verification of distance protection setting value of power grid transmission line

Abstract

The invention provides an on-site verification system for the distance protection setting value of the power grid transmission line, which includes a relay protection outlet action circuit and three logic circuits; each logic circuit realizes the power grid by loading various voltage setting values ​​and current setting values. The simulation of each phase-to-ground fault or various phase-to-phase faults of the transmission line; each logic circuit includes an AND gate, an OR gate, and a switching relay; the input end of the AND gate is connected to the output end of the OR gate and the switching relay, and the output end is connected to the relay The electrical protection outlet action circuit is connected; the two input terminals of the OR gate are connected with two external signal sources; the input terminals of the switch relay are connected with multiple relays loaded with the voltage setting value and current setting value of phase A, B and C; the relay The action circuit of the protection outlet checks the actual voltage and current setting values ​​required by the logic circuit to be checked when simulating each phase-to-ground fault or various phase-to-phase faults through the protection state verification. By implementing the invention, the setting value on the transmission line of the power grid can be quickly verified on site.

Description

technical field [0001] The invention relates to the technical field of relay protection, in particular to a system and method for on-site verification of distance protection setting values ​​of power grid transmission lines. Background technique [0002] With the development of the power grid, relay protection devices are gradually increasing, and before the relay protection device is put into operation, its function must be gradually verified according to the set value. Only through the verification can it be found whether there is a defect, and it can be put into operation after the defect is eliminated. Otherwise, the incorrect action of the relay protection device will lead to power grid accidents; among them, the defects of the relay protection device include wiring errors, incorrect logical relationship of the protection itself, and incorrect connection mode of the switching connection piece. [0003] At present, there are multiple protections such as longitudinal diff...

AI Technical Summary

Problems solved by technology

[0004] However, there is still a lack of a step-by-step verification method for the distance protection setting value of the power grid transmission line, especially the on-site verification of the distance protection setting value of the power grid transmission line, so that there are hidden dangers in the safe operation of the power grid transmission line

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