Power grid overvoltage identification method by adopting multi-parameter ratio codes

Abstract

The invention discloses a power grid overvoltage identification method by adopting multi-parameter ratio codes. The method comprises the following steps of: dividing an overvoltage wave form into a value interval of lightning overvoltage characteristic value, a value interval of operation overvoltage characteristic value and a value interval of temporary overvoltage characteristic value; extracting different characteristic amount respectively on the three time intervals, determining the obtained characteristic amount accoriding to the determining rule, and giving codes designed according to a criterion rule for the time interval; and finally acquiring only one string of codes after the same type of overvoltage is extracted and determined by the characteristic value of the three intervals, and distinguishing the overvoltage of different types according to the overvoltage types corresponding to the codes so as to identify the overvoltage. The method can effectively reflect the parameters of the overvoltage intrinsic characteristic through data processing extraction according to the data of overvoltage wave form and the like acquired by a monitoring device, and can identify multiple kinds of overvoltage of a power system according to corresponding criterion rules.

Description

technical field [0001] The invention belongs to the technical field of electric system overvoltage type identification, is specifically applicable to the research on internal and external overvoltages of electric power systems, and provides reference and basis for realizing identification of different types of overvoltages in electric power systems. Background technique [0002] Modern society has higher and higher requirements for the reliability of power system power supply. There are many reasons for the power supply interruption of the power system, but the breakdown of the insulation is the main cause of the power outage, and the accident caused by the overvoltage is dominant in the insulation accident. Power grid overvoltage, especially internal overvoltage, poses a serious threat to electrical equipment and line insulation; lightning overvoltage also poses a serious threat to system insulation below 220kV. Frequent occurrence of electrical equipment overvoltage accide...

AI Technical Summary

Problems solved by technology

[0006] (2) System failure and misoperation often cause internal overvoltage. If there is no specific analysis and identification of overvol

Images