A transient current based bus zone protection scheme using wavelet transform
01 Nov 2008-pp 1-5
TL;DR: In this paper, the authors deal with the application of wavelet transform for the detection of busbar faults and providing backup for external faults in the event of internal faults, the transient behavior of feeder and zone-2 currents is opposite to that of zone-1 source current and the corresponding currents exhibit similar transient behavior as that of source current.
Abstract: This paper deals with the application of wavelet transform for the detection of busbar faults and providing backup for external faults In the event of internal faults the transient behavior of feeder and zone-2 currents is opposite to that of zone-1 source current In the event of feeder or zone-2 faults, the corresponding currents exhibit similar transient behavior as that of source current The transients of these current signals are analyzed using wavelet based multi resolution analysis to obtain detailed coefficients over a narrow moving window The fault indexes of each current signal, defined based on these detailed coefficients, are utilized to detect the internal faults as well as external faults The scheme is tested for different types of internal and external faults with various incidence angles and fault impedance The proposed scheme discriminates internal faults from external faults even in the presence of current transformer saturation
Citations
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TL;DR: A novel scheme for identifying the location of short-circuit faults that occur in distribution system is suggested and genetic algorithm– based heuristic search method is used to place measuring devices at optimal location, and it is carried out in MATLAB.
Abstract: In this paper, a novel scheme is suggested for identifying the location of short-circuit faults that occur in distribution system. The proposed genetic algorithm and graph theory–based method is designed such a way that it splits electrical distribution system into protection zones containing buses, protection relays with measuring devices. Proposed methodology also decreases the calculation burden in dealing with large number of data sets. Genetic algorithm– based heuristic search method is used to place measuring devices at optimal location, and it is carried out in MATLAB. A new signal processing technique named dual tree complex wavelets transform is used for feature extraction, and support vector machine–based machine learning classifier is used for pattern recognition. IEEE33 bus radial distribution system and IEEE13 bus feeder test systems are tested for validating the proposed methodology and all the simulation work carried out in MATLAB Simulink.
References
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14 Nov 2005
TL;DR: In this article, a wavelet-packet transform (WPT) based differential busbar-protection technique is presented, which decomposes the fault signal into different frequency bands in the time domain.
Abstract: A novel wavelet-packet-transform- (WPT-) based differential busbar-protection technique is presented. The paper uses the wavelet-packet- transform (WPT) method to extract features from a fault-current signal. The WPT can decompose the fault signal into different frequency bands in the time domain. The differential signal is computed from the decomposed extracted signal. The WPT-based differential busbar-protection scheme solves several problems of current protective relays. The CT error and ratio-mismatch problems do not have any impact on the proposed WPT-based scheme. ATP simulations are used to test and validate the proposed technique for model-power-system faults.
56 citations
"A transient current based bus zone ..." refers methods in this paper
...ME Mohammed has proposed a scheme in [6], which makes use of Wave Packet Transforms (WPT)....
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TL;DR: A new method for selecting bus protection zones in microprocessor-based relays, based upon graph theory, is presented and a typical bus arrangement is used to illustrate the graphical representation of station arrangements, graph operations, and associated matrix operations.
Abstract: Use of graph theory simplifies representation of complex bus arrangements in power system stations. This paper presents a new method, based upon graph theory, for selecting bus protection zones in microprocessor-based relays. We use a typical bus arrangement to illustrate the graphical representation of station arrangements, graph operations, and associated matrix operations. We also describe an implementation of the zone selection method and use two examples to demonstrate the advantages of the method. Using the status of switching devices in the station, the zone selection method provides the relay with real-time bus arrangement information. The bus relay uses this information to assign input currents to a differential protection zone and to select which breakers to trip for a bus fault or breaker failure.
38 citations
09 Apr 2001
TL;DR: In this article, the application of wavelet transforms to detecting power system faults and describing a number of new protection principles and techniques based on the wavelet transform is presented. But the significant advantages of these protection schemes are outlined in the paper.
Abstract: This paper presents extensive studies of the application of wavelet transforms to detecting power system faults and describes a number of new protection principles and techniques based on the wavelet transform. These include a number of novel protection schemes for the protection of transmission lines, distribution feeders, generators and transformers. The significant advantages of these protection schemes are outlined in the paper. Finally the application of the proposed technique to busbar protection is presented to examine the feasibility of new protective algorithm.
29 citations
"A transient current based bus zone ..." refers methods in this paper
...The external faults are then classified based on polarities of peak d-coefficients obtained from Multi Resolution Analysis of Source, Feeder and Zone-2 current signals to provide backup protection....
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...in) The wavelet transforms (WT) has been proposed for busbar protection, which has feature extraction capabilities due to their Multi Resolution Analysis [4]....
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...Shaik Abdul Gafoor is currently with Electrical and Electronics Engineering Department, Bapatla Engineering College, Bapatla, India , 522101 (Phone No.+91 9440602014, email:saadgafoor@gmail.com Fax+91 8643 224246) N. Rama Devi is currently with Electrical and Electronics Engineering Department, Bapatla Engineering College, Bapatla, India , 522101(email:ramadevi75@gmail.com) P V. Ranana Rao is with Electrical Engineering Department, National Institute of Technology, Warangal, India, 506004(email: pvr_ee@yahoo.co.in) The wavelet transforms (WT) has been proposed for busbar protection, which has feature extraction capabilities due to their Multi Resolution Analysis [4]....
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TL;DR: In this paper, the use of a continuous wavelet transform (CWT) was used to distinguish faults in a busbar protection zone from those outside the zone. And the proposed wavelet transformation approach based on the Morlet wavelet basis function was found to be an excellent discriminant for identifying the fault signals during the CT saturation and ratio mismatch.
Abstract: This paper deals with the use of a continuous wavelet transform (CWT) to distinguish faults in a busbar protection zone from those outside the zone. The Morlet wavelets are used as the wavelet basis function. They are more efficient in monitoring fault signals as time varies. The differential current as the operating quantity and the sum of the current magnitudes as the stabilizing signal are computed. The magnitudes of the CWT of these currents are derived to obtain the operational and restraint signals. The CWT coefficient plots are given to precisely determine the scale of analysis. The proposed wavelet transform approach based on Morlet basis function is found to be an excellent discriminant for identifying the fault signals during the CT saturation and ratio mismatch. ATP simulations are used to test and validate the proposed CWT approach for model power system faults.
28 citations
Additional excerpts
...differential protection scheme was proposed in [5]....
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