Protection of Transmission Lines using Discrete Wavelet Transform
Reena Sharma1, Aziz Ahmad2, Shailendra Kr. Saroj3
1Ms. Reena Sharma, Department of Electrical Engineering, Maharshi Dayanand University, Rohtak Al-Falah Engineering and Technology, Dhauj, Faridabad (Haryana), India.
2Prof. Aziz Ahmad, Department of Electrical Engineering, Maharshi Dayanand University, Rohtak Al-Falah Engineering and Technology, Dhauj, Faridabad (Haryana), India.
3Shailendra Saroj, Assistant Professor, Department of Electrical Engineering, Mahamaya Technical University, IEC-CET Greater Noida (U.P), India.
Manuscript received on 11 June 2013 | Revised Manuscript received on 17 June 2013 | Manuscript Published on 30 June 2013 | PP: 167-171 | Volume-3 Issue-1, June 2013 | Retrieval Number: A0938063113/13©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The main objectives of transmission line protection scheme are precisely differentiate the faults zone and indicate exact fault type using one end data only so that only faulted line will be removed .Fault generates transient current wave contained distinct frequency bands. In this paper discrete wavelet transform is used to capture two bands of frequencies from the transient current signal using db1 as a mother wavelet. The spectral energies of these two bands are obtained to determine the fault zone. The faulted phase selection is done by the discrete wavelet transform using Haar as the mother wavelet. The coefficient of a frequency band in the range of 1 KHz-3 KHz are obtained for the three phase and ground currents. The average value of the coefficients of each current wave is then computed and used to classify the faulted phase. Fault simulations are performed using MATLAB/Simulink and then the results are interfaced to MATLAB where the algorithm is implemented.
Keywords: Boundary Protection, High Frequency Transient Signals, Mother Wavelet, Non-Unit Protection, Power System Faults, Unit Type Protection, Wavelet Transforms.
Scope of the Article: Aggregation, Integration, and Transformation