A Novel Busbar Protection Based on the Average Product of Fault Components

Abstract

This paper proposes an original busbar protection method, based on the characteristics of the fault components. The method firstly extracts the fault components of the current and voltage after the occurrence of a fault, secondly it uses a novel phase-mode transformation array to obtain the aerial mode components, and lastly, it obtains the sign of the average product of the aerial mode voltage and current. For a fault on the busbar, the average products that are detected on all of the lines that are linked to the faulted busbar are all positive within a specific duration of the post-fault. However, for a fault at any one of these lines, the average product that has been detected on the faulted line is negative, while those on the non-faulted lines are positive. On the basis of the characteristic difference that is mentioned above, the identification criterion of the fault direction is established. Through comparing the fault directions on all of the lines, the busbar protection can quickly discriminate between an internal fault and an external fault. By utilizing the PSCAD/EMTDC software (4.6.0.0, Manitoba HVDC Research Centre, Winnipeg, MB, Canada), a typical 500 kV busbar model, with one and a half circuit breakers configuration, was constructed. The simulation results show that the proposed busbar protection has a good adjustability, high reliability, and rapid operation speed.

The Analysis and Solution of Current Differential Protection Maloperation for Transmission Line with High Series Compensation Degree

“…From Equation (10), it can be obtained that the sensitivity is decreased with the increases of the degree of compensation and the value of K. However, Equation (9) is more complicated, and the trend of sensitivity cannot be directly calculated, further classification analysis is as follows.…”

A hybrid intelligent busbar protection strategy using hyperbolic S‐transforms and extreme learning machines

“…The main contributions and advantages of the proposed busbar protection scheme in this paper are: (1) high accuracy in discriminating internal faults from other abnormal modes, that is, external faults and inrush current, through the use of several features simultaneously; (2) high-speed fault detection in 10 ms up to 20 ms, where the latter is related to some cases with high impedance faults; (3) insensitivity to noise; (4) maintaining accuracy in the presence of current transformer (CT) saturation; (5) no requirement to change the architecture of the protective infrastructures of the power system that is useful for easier implementation (6) considering the effect of impedance of faults (up to 800 Ω), the angle of fault occurrence (complete range between 0 • and 360 • ), and the sources' angle on detection accuracy of the proposed method (7) working efficiently under the values of fault resistance for which the algorithm has not been trained.…”