Double-terminal location method for fault points of electric transmission line

Abstract

The invention discloses a double-terminal location method for fault points of an electric transmission line.The double-terminal location method is applied to optical fiber differential protection appearing in pairs, special algorithm operation is achieved through the protection device, automatic collecting of current and voltage of two-side lines can be achieved through two-side differential protection, and the opposite-side electrical quantities are subjected to two-way transmission through optical fibers.The double-terminal location method includes the following steps that 1, the faulted electrical quantities are calculated; 2, the numerical values of the voltage quantities at the faulting positions are calculated; 3, the values of the current quantities at the faulting positions are calculated; 4, the calculated results in the step 3 and the step 4 and the resistance characteristic of ground resistance are used to obtain the final fault-location result.

Description

technical field [0001] The invention relates to a method for performing double-terminal distance measurement on fault points of transmission lines. Background technique [0002] With the continuous development of industry, electric energy, as a clean secondary energy, has an increasing proportion in current energy applications, and has become an important guarantee for human normal life and production. The high-voltage transmission line is the lifeblood of the power system. As the link of energy transmission, it is an important part of the power system, and it is also the place where the most faults occur in the power system. After the system fails, it is of great significance to quickly find the location of the fault point and discover potential safety hazards in time for the safe and stable operation of the system and reliable power supply. [0003] The problem of fault location has been around for a long time. Faults in power systems are generally divided into transient ...

AI Technical Summary

Problems solved by technology

[0003] The problem of fault location has been around for a long time. Faults in power systems are generally divided into transient faults and permanent faults; transient faults can generally be removed by automatic reclosing, but there are still certain dangers at the fault point, and there are still faults. Possibly, it is necessary to find the fault point in time to ensure the normal operation of the line; when a permanent fault occurs on the transmission line, the normal working state of the system will be destroyed. At this time, it is necessary to quickly find and eliminate the fault. The greater the harm to the stable operation of the entire system