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: The proposed scheme is able to provide ultra-high-speed protection for the bus faults and solves the problem of CT saturation which is the biggest challenge in conventional low-impedance busbar differential protection schemes (87B).
Abstract: This paper proposes a new busbar protection scheme based on the analysis of correlation coefficients between the current waveforms of all lines connected to the busbar. The cross-correlation coefficients between current waveforms of each line in moving windows are calculated in a phase segregate manner with respect to a reference line. It's performance has been evaluated by modelling an existing 400-kV Indian substation in PSCAD/EMTDC software package. The proposed scheme is able to provide ultra-high-speed protection for the bus faults. It's stability has been tested against a wide range of external faults. It also solves the problem of CT saturation which is the biggest challenge in conventional low-impedance busbar differential protection schemes (87B).
3 citations
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01 Jan 2016
TL;DR: This Thesis is protected by copyright and/or related rights and has been brought to you by ScholarWorks@UNO with permission from the rights-holder(s).
Abstract: This Thesis is protected by copyright and/or related rights. It has been brought to you by ScholarWorks@UNO with permission from the rights-holder(s). You are free to use this Thesis in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rightsholder(s) directly, unless additional rights are indicated by a Creative Commons license in the record and/or on the work itself.
1 citations
Cites methods from "A transient current based bus zone ..."
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TL;DR: The proposed differential and restraining coefficients-based differential busbar protection scheme is able to provide high-speed protection for the bus faults and remains stable against external faults.
Abstract: This paper proposes a new instantaneous energy coefficients-based differential busbar protection scheme (namely, 87BT). The differential and restraining coefficients are calculated in a mode-segregated manner from the instantaneous phase current values. In order to evaluate its performance, an existing 400-kV substation with double-bus single breaker configuration has been modelled in PSCAD/EMTDC. The proposed scheme is able to provide high-speed protection for the bus faults. Moreover, it remains stable against external faults. A comparative evaluation with respect to 87B in case of CT saturation conditions has also been presented.
1 citations
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TL;DR: The results obtained from the proposed algorithm show its high responsiveness for bus faults and firmness against external faults and the feasibility of on-field implementation of the proposed scheme for IEC-61850 applications has been discussed.
Abstract: A wavelet transform approach to IEC-61850 based busbar protection has been proposed in this paper. Initially, areal mode current travelling waves (TWs) are calculated using Karenbauer phase-modal transformation. Thereafter, the postfault initial travelling wavefronts in the form of wavelet transform modulus Maximas (WTMMs) have been extracted using level-1 detailed coefficients of Daubechies-1 wavelet. In order to evaluate performance of the proposed scheme, an existing 400-kV Indian substation with double-busbar arrangement has been developed. The results obtained from the proposed algorithm show its high responsiveness for bus faults and firmness against external faults. At the end, the feasibility of on-field implementation of the proposed scheme for IEC-61850 applications has been discussed.
1 citations
DOI•
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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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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.
55 citations
"A transient current based bus zone ..." refers methods in this paper
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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
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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
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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.
26 citations
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