Line longitudinal differential protection simulation method and device

Abstract

The invention discloses a line longitudinal differential protection simulation method. The method comprises the following steps: acquiring respective electrical quantity information of a power supply side and a load side at two ends of a line, and performing electromagnetic transient simulation on a primary system of a transformer substation to obtain the respective electrical quantity information of the power supply side and the load side at the two ends of the line; acquiring a line differential protection constant value; and based on a preset line longitudinal differential protection rule, in combination with the electrical quantity information of the power supply side and the load side at the two ends of the line and the line differential protection constant value, calculating and judging whether the line between the power supply side and the load side has a fault, and if the fault occurs, starting line longitudinal differential protection. According to the invention, a pure digital backup protection simulation test can be carried out on a line, the matching correctness of an in-station protection constant value and a backup protection constant value in a regional power grid can be verified, and the power failure loss is reduced.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection test. More specifically, the present invention relates to a simulation method and device for line longitudinal differential protection. Background technique [0002] At present, in the existing substation transmission line relay protection fixed value check, the accuracy of the fixed value is checked by using the relay protection test to increase the amount of single protection. This kind of checking method is only for the reliability of single protection devices. After checking, it is impossible to judge the mis-entry of the operating setting in the on-site protection device, the wrong switching of the pressure plate, and the coordination performance of the regional power grid. Therefore, the current existing calibration methods have certain limitations, and cannot completely solve the problems of incorrect setting of fixed values, incorrect input and return of pre...

AI Technical Summary

Problems solved by technology

[0002] At present, in the existing substation transmission line relay protection fixed value check, the accuracy of the fixed value is checked by using the relay protection test to increase the amount of single protection. This kind of checking method is only for the reliability of single protection devices. After checking, it is impossible to judge the mis-entry of the operation settings in the on-site protection device, the wrong switching of the pressure plate, and the coordination performance of the regional power grid.

Therefore, the current existing calibration methods have certain limitations, and cannot completely solve the problems of incorrect setting of fixed values, incorrect input and return of pressing plates, and incorrect input of fixed values ​​that exist in actual production. The above problems provide guarantee for the safe and stable operation of the large power grid

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