The Experts below are selected from a list of 105 Experts worldwide ranked by ideXlab platform
Zhe Chen - One of the best experts on this subject based on the ideXlab platform.
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Application of Transient Polarity Comparison Technique to Power System Protection
2005 IEEE PES Transmission & Distribution Conference & Exposition: Asia and Pacific, 2005Co-Authors: Zhiqian Bo, D. Thomolier, Andrew Klimek, J H He, B.r.j. Caunce, Zhe Chen, Xinzhou Dong, Miles A RedfernAbstract:This paper introduces the development of transient polarity comparison principles for Power Line Protection. A brief introduction to the history of Power system Protection is first given, which outLines the background of the new developments. The paper then introduces the new Protection techniques based on fault transient polarity detection. The descriptions of new relaying techniques based on the detection of fault generated transients and their associated Protection schemes are the main part of the paper. The new Protection techniques based on transient polarity comparison not only offer significant new features for Power Line Protection, but also produce novel schemes for the integrated Protection of Power network
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integrated Line and busbar Protection scheme based on wavelet analysis of fault generated transient current signals
IEEE International Conference on Power System Technology, 2004Co-Authors: Zhe Chen, Xiangning Lin, B.r.j. CaunceAbstract:This paper presents a new directional relaying principle, which integrates the Power Line Protection with the busbar Protection together. In the presented technique, the relay installed at the busbar is responsible for the detection of fault direction with respect to the busbar. The transient signals captured from CTs related to the Power Lines connected to the busbar are processed with a wavelet technique to determine the fault direction. Simulation studies show that the scheme is insensitive to fault type, fault position, fault path resistance and fault inception angle. It has been shown the presented scheme is suitable for all types of faults occurring at different sections on the Power Lines or the busbar and its associated equipment. In addition, the technique is fast in response, simple in principle and easy to implement.
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Boundary Protection - A Power Line Protection Technique Based on Fault Generated High Frequency Currents
HKIE Transactions, 2003Co-Authors: Zhe Chen, N. F. Chin, F. JiangAbstract:This paper presents the boundary Protection (BP) technique, a Protection technique based on the detection of fault generated high frequency current signals. In the boundary Protection technique, the Power system busbars are used as the boundaries of Protection zones. Advanced signal processing technique is applied to analyse the captured transient signals and extract high frequency signals at the desired bands. Then the spectral energies at different frequency bands are processed to distinguish between internal and external faults. In this paper, the principles of the boundary Protection technique and the relay design are described. The application case studies of the technique under various system situations are presented. It is shown that the technique has demonstrated the potential to provide a solution for realising a camplete Power Line Protection scheme without the need of a cammunicatian link.
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Developments in directional Power Line Protection using fault transients
Proceedings. International Conference on Power System Technology, 1Co-Authors: Zhe Chen, B.h. Zhang, M.a. Redfern, X.z. Dong, B.r.j. CaunceAbstract:This paper presents the development of a new directional Power Line Protection using fault transients. In the presented technique, the relay installed at the substation busbar is responsible for the detection of fault direction with respect to the busbar. The transient signals captured from each Power Line connected to the busbar are analyzed and compared to determine the fault direction. Simulation results show that this scheme is suitable for all types of faults occurring at different positions on the Power Lines. It also provides higher sensitivity as compared with traditional Protection schemes.
B.r.j. Caunce - One of the best experts on this subject based on the ideXlab platform.
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Transient Directional Protection Based on the Transformation of Positive Sequence Component
Proceedings of the 41st International Universities Power Engineering Conference, 2006Co-Authors: Biao Zhang, B.r.j. Caunce, Andrew KlimekAbstract:This paper proposes a new current mode derived by a new modal transformation technique, the alpha mode. The mode is used to detect and distinguish between internal and external faults for Power Line Protection, based on a new transient directional comparison technique using current alone. The technique uses the symmetrical component to replace Clark or Karrenbauer transformation to decouple the three phase transient current signals. Wavelet transform is then applied to the positive sequence component to produce the modular maximum, which are subsequently used to distinguish between internal and external faults. The modular maximum of the wavelet transform for the new alpha mode have the same polarity at both ends of the Line for internal faults and opposite polarity for external faults. Theoretical analysis and extensive simulation studies show that the technique is able to give correct responses for all fault types
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Application of Transient Polarity Comparison Technique to Power System Protection
2005 IEEE PES Transmission & Distribution Conference & Exposition: Asia and Pacific, 2005Co-Authors: Zhiqian Bo, D. Thomolier, Andrew Klimek, J H He, B.r.j. Caunce, Zhe Chen, Xinzhou Dong, Miles A RedfernAbstract:This paper introduces the development of transient polarity comparison principles for Power Line Protection. A brief introduction to the history of Power system Protection is first given, which outLines the background of the new developments. The paper then introduces the new Protection techniques based on fault transient polarity detection. The descriptions of new relaying techniques based on the detection of fault generated transients and their associated Protection schemes are the main part of the paper. The new Protection techniques based on transient polarity comparison not only offer significant new features for Power Line Protection, but also produce novel schemes for the integrated Protection of Power network
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integrated Line and busbar Protection scheme based on wavelet analysis of fault generated transient current signals
IEEE International Conference on Power System Technology, 2004Co-Authors: Zhe Chen, Xiangning Lin, B.r.j. CaunceAbstract:This paper presents a new directional relaying principle, which integrates the Power Line Protection with the busbar Protection together. In the presented technique, the relay installed at the busbar is responsible for the detection of fault direction with respect to the busbar. The transient signals captured from CTs related to the Power Lines connected to the busbar are processed with a wavelet technique to determine the fault direction. Simulation studies show that the scheme is insensitive to fault type, fault position, fault path resistance and fault inception angle. It has been shown the presented scheme is suitable for all types of faults occurring at different sections on the Power Lines or the busbar and its associated equipment. In addition, the technique is fast in response, simple in principle and easy to implement.
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Developments in directional Power Line Protection using fault transients
Proceedings. International Conference on Power System Technology, 1Co-Authors: Zhe Chen, B.h. Zhang, M.a. Redfern, X.z. Dong, B.r.j. CaunceAbstract:This paper presents the development of a new directional Power Line Protection using fault transients. In the presented technique, the relay installed at the substation busbar is responsible for the detection of fault direction with respect to the busbar. The transient signals captured from each Power Line connected to the busbar are analyzed and compared to determine the fault direction. Simulation results show that this scheme is suitable for all types of faults occurring at different positions on the Power Lines. It also provides higher sensitivity as compared with traditional Protection schemes.
Sindisiwe C. Malanda - One of the best experts on this subject based on the ideXlab platform.
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Lightning Performance and Economic Analysis of an Overhead 88 kV Power Delivery Network with Enhanced Protective Systems
Energies, 2020Co-Authors: Eddie Singh, Innocent E. Davidson, Sindisiwe C. MalandaAbstract:Earthing and protective devices such as Line surge arrestors (LSAs) play an important role in areas with high lightning occurrence for overhead HVAC Lines’ performance. A lightning stroke of high magnitude can lead to back flash-overs, and the resultant Power surge on the phase conductor can cause instigate the Line breaker operating to extinguish the Power surge. This operation of the protective devices leads to consumer interruptions on the network, a loss of production, and negatively affects the economy. Studies have shown that reducing an earthing system’s values, which itself is costly, may not be sufficient to prevent back flashover and the associated customer production cost loss. A code was developed to determine the possibility of back flashover and the cost of various earthing schemes utilizing the MATLAB software analysis tool. This paper determines the possibility of a back flashover for various combinations of lightning strokes and earthing profiles. Tower Footing Resistances as low as 9.8 Ω can cause back flashover, provided the lightning stroke exceeds 12 kA. Furthermore, the paper presents and discusses an innovative hybrid Power Line Protection scheme, which estimates and considers the high cost associated with establishing an earthing system; it examines the impracticality of re-engineering an earthing scheme for implementation and results obtained by the inclusion of lightning surge arrester’s (LSA). The cost-saving resulting from dips is also established over 25 years for an 88 kV Line, and the breakeven point is established. The results showed that the best scenario would be to reduce the tower footing resistance to 29.1 Ω and install 11 LSA per phase.
Dong Xinzhou - One of the best experts on this subject based on the ideXlab platform.
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Power Line Protection and Detection Technology Based on Direction Travelling Wave
Guangdong Electric Power, 2012Co-Authors: Dong XinzhouAbstract:It is necessary to decompose travelling wave for forward wave and back wave which is a kind of single direction travelling wave during the period of failure analysis because that travelling wave Protection and detection technology are provided with characteristic of ultra-high speed and will not be affected by transition resistance of the fault point or system oscillation.It concludes failure discrimination and state detection principles based on single direction travelling wave at home and abroad,analyzes necessity of application of travelling wave decomposition in fields like failure start,Line selection for fault,phase selection for fault,fault location and fault direction discrimination and at last it points out the application prospect of single direction travelling wave.
Eddie Singh - One of the best experts on this subject based on the ideXlab platform.
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Lightning Performance and Economic Analysis of an Overhead 88 kV Power Delivery Network with Enhanced Protective Systems
Energies, 2020Co-Authors: Eddie Singh, Innocent E. Davidson, Sindisiwe C. MalandaAbstract:Earthing and protective devices such as Line surge arrestors (LSAs) play an important role in areas with high lightning occurrence for overhead HVAC Lines’ performance. A lightning stroke of high magnitude can lead to back flash-overs, and the resultant Power surge on the phase conductor can cause instigate the Line breaker operating to extinguish the Power surge. This operation of the protective devices leads to consumer interruptions on the network, a loss of production, and negatively affects the economy. Studies have shown that reducing an earthing system’s values, which itself is costly, may not be sufficient to prevent back flashover and the associated customer production cost loss. A code was developed to determine the possibility of back flashover and the cost of various earthing schemes utilizing the MATLAB software analysis tool. This paper determines the possibility of a back flashover for various combinations of lightning strokes and earthing profiles. Tower Footing Resistances as low as 9.8 Ω can cause back flashover, provided the lightning stroke exceeds 12 kA. Furthermore, the paper presents and discusses an innovative hybrid Power Line Protection scheme, which estimates and considers the high cost associated with establishing an earthing system; it examines the impracticality of re-engineering an earthing scheme for implementation and results obtained by the inclusion of lightning surge arrester’s (LSA). The cost-saving resulting from dips is also established over 25 years for an 88 kV Line, and the breakeven point is established. The results showed that the best scenario would be to reduce the tower footing resistance to 29.1 Ω and install 11 LSA per phase.