Rapid bus protection method based on fault component mean value product

Abstract

The invention discloses a rapid bus protection method based on a fault component mean value product. The rapid bus protection method particularly includes the steps of (1) collecting the voltages and the currents at the positions, where bus protection elements are located, of outgoing lines connected with a bus in real time; (2) conducting phase-mode transformation on the voltages and the currents of fault components, and extracting respective line mode components; (3) calculating the product of mean values of the line mode voltages and the line mode currents, wherein the plus or the minus of the product of the mean values serves as a basis for judging forward faults and backward faults, a judging result of the fault directions of all outgoing lines serves as a basis for judging whether the bus breaks down or not. According to the rapid bus protection method, the phase-mode transformation is adopted, a bus protection criteria is constructed through the characteristic of the product of the mean values of the line mode voltages of the fault components and the line mode currents of the fault components, and the rapid bus protection method has the advantages of being easy and convenient to use, high in sensitivity, high in motion speed and accurate in recognition, and enabling engineering to be easily realized.

Description

technical field [0001] The invention relates to a fast busbar protection method based on the mean product of fault components. Background technique [0002] Building a clean, safe, self-healing, economical, high-quality and interactive strong smart grid is the development direction and inevitable trend of grid automation technology. As the key support point of the smart grid and the node of the power network, the substation undertakes functions such as connecting lines, transmitting electric energy, changing voltage levels, collecting current, distributing current, controlling the flow of electric energy, and adjusting voltage. Therefore, the safe and reliable operation of the power grid largely depends on the reliability of substation equipment and systems. As one of the important components of the power system, the substation busbar connecting generators, transformers, transmission lines and loads is the hub of power transmission and distribution in the power system. If ...

AI Technical Summary

Problems solved by technology

This method has high reliability and strong adaptability, but the sampling frequency is high and the bus structure has a certain influence on the measured wave impedance

[0012] It can be seen that the existing research on busbar protection does not have a completely economical and practical method with fast action speed and high sensitivity

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