Electric network functional failure travelling wave positioning method

Abstract

The invention belongs to the field of electric power system, which relates to a fault traveling wave positioning method based on the whole electric power transmission network. The method of the invention is that all transformer substations of the electric power transmission network are provided with fault traveling wave positioning devices, and the central control room of the electric power transmission network is provided with a fault positioning main station. When the power transmission line is in fault, the positioning devices record the arrival time of the traveling wave from the transformer substations and the state of the breaker; according to the arrival time of the traveling time and the state of the breaker recorded by the positioning devices, the main station, which confirms the fault line and eliminates the ineffective time data, arranges the traveling wave time at the two sides of the fault time into two arrays, and by the two-end fault traveling wave positioning algorithm, works out the distance from the fault point to the transformer substation at the end of the fault line, after that, implements weighting summation of the fault distance, finally, gains the accurate fault position. The method of the invention eliminates the influence to the fault positioning caused by part positioning device fault, starting failure and error time record, etc., thereby greatly improving the accuracy, reliability and economic of the fault traveling wave positioning.

Description

technical field [0001] The invention belongs to the field of power systems and relates to a fault traveling wave location method based on the entire power grid. Background technique [0002] High-voltage transmission lines have long transmission distances, are exposed in the wilderness, and are mostly mountainous and hilly terrains. The rapid and precise location and search of fault points has always been an unsolved problem for the power sector, and it has also brought a heavy burden to line operation and maintenance personnel. At present, there are three main transmission line fault location methods used in power systems at home and abroad: the impedance location method based on fault recording devices, the lightning location method dedicated to lightning faults, and the GPS fault traveling wave location method. The impedance location method uses the fault recording data to calculate the fault point location of the line according to the impedance change caused by the fault...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and solve the technical problems of poor positioning accuracy, positioning failure and high positioning cost in the existing transmission line fault traveling wave positioning method

The present invention performs fault location based on the traveling wave time information of the entire power grid, not just limited to one line, thereby solving the problem of large positioning error or even positioning failure in the traditional positioning method, such as faulty positioning device, failure to start, or wrong time record. Improve the accuracy and reliability of transmission line fault traveling wave location

Images