Vol(1), Issue(10)

IJSRE - Vol(1), Issue(10)

A FUZZY SET APPROACH TO FAULT CLASSIFICATION FOR TRANSMISSION LINE PROTECTION
Kunal Singh Verma*, Mr. B.B. Dash
ABSTRACT :

In this paper, a fuzzy logic-based fault classification scheme for transmission lines is proposed. The classification procedure is carried out by only post fault current phasor of three phases of the transmission line. The proposed technique is able to classify all the possible types of faults including single-phase to ground, two-phases, two-phases to ground and three-phase faults with high accuracy. In addition, this method can identify the faulted phase(s) from non-faulted phase(s). The proposed method has a good performance in high fault resistances, and high fault distances from relaying point. Large numbers of test cases are generated to verify the performance of proposed technique. The simulation studies have been carried out by using MATLAB/SIMULINK. SimPowerSystems and Fuzzy Logic Toolbox have been used from MATLAB.

AUTHOR :

Kunal Singh Verma
M.Tech Student, Department of E.E., RCET, Bhilai, Chhattisgarh, INDIA

Mr. B.B. Dash
Assistant Professor, Department of E.E., RCET, Bhilai, Chhattisgarh, INDIA

KEYWORDS :

Transmission line, Discrete Fourier transform (DFT), Fuzzy logic system (FLS), Fault detection (FD), Fault classification (FC), Fault inception angle (FIA)

CONCLUSION :

An accurate fault classification technique using fuzzy logic system has been proposed, which can be implemented for the digital protection of the power transmission line. The proposed protection technique requires the consideration of the three phase post fault current samples at one end of line only. The fault classification algorithm is based on the angular differences among the sequence components of the fundamental fault current as well as on the relative magnitudes of fundamental phase current.
This features calculated are given as input to the fuzzy logic system for fault classification. Fuzzy rule bases for classifying faults involving ground and faults not involving ground have been developed. The appropriate rule base is selected for fault classification, on the basis of whether the fault involves ground or not. Simulation studies carried out considering wide variations in fault resistance, fault inception angle and fault location for different types of fault have proved the validity of the proposed approach.
The simulation results obtained with the proposed protection scheme confirm the reliability and suitability of the proposed technique under different fault situations. Thus, the proposed technique can be applied as an independent protection scheme or as a supplement to existing protection schemes.

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