Results 131 to 140 of about 757 (163)
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Transient Simulations for HVDC Transmission Lines
International Review on Modelling and Simulations (IREMOS), 2015A comprehensive methodology for transient studies of HVDC lines for interconnected AC power systems is proposed as a useful tool for its design and operation. This methodology is based on frequency dependent modelling of HVDC transmission lines and a full modelling of their associated equipment in order to do transient simulations.
Mario A. Rios, Sebastian Olivares
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Lightning model for HVDC transmission lines
10th IET International Conference on Developments in Power System Protection (DPSP 2010). Managing the Change, 2010In the paper, the complete lightning model for HVDC transmission lines is presented, and the model is divided into five parts: lightning discharging model, insulator string flashover model, arrester model, tower model and conductor/ground wires model. The proposed lightning model was successfully tested in the PSCAD/EMTDC software.
M. You +4 more
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Measurement and Statistical Analysis of Ozone from HVDC and HVAC Transmission Lines
IEEE Power Engineering Review, 1985Corona-generated ozone is one of the parameters considered in evaluating the environmental impact of high voltage ac and dc transmission lines. Measurements of ozone levels near an operating 735-kV ac line and near a test line with ±900-kV and ±450-kV dc line configurations are reported in this paper.
L. Varfalvy +3 more
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Neutral Line Protection System for HVDC Transmission
IEEE Transactions on Power Delivery, 1986This paper described the principle of fault detection and its simulator study, principal circuitry, field test results and field performance records on the neutral line protection system for an HVDC transmission system. In the protection system, 125 Hz ac current injected to the neutral line is utilized as a pilot current to detect the neutral line ...
Y. Kato +5 more
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An Application of HVDC to the de-icing of Transmission Lines
2005/2006 IEEE/PES Transmission and Distribution Conference and Exhibition, 2006Ice accumulation on transmission lines in extreme climatic events can result in severe damage to the lines and towers, with the possibility of being unable to restore the service quickly enough to preserve electricity supplies to customers. To prevent such a situation, Hydro-Quebec TransEnergie are investing in a dedicated "De-icer" installation at its
C. Horwill +3 more
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Fault detection and localization for HVDC transmission lines
2018 Simposio Brasileiro de Sistemas Eletricos (SBSE), 2018This paper evaluates a new method for faults detections in transmission lines in HVDC systems. The proposed method uses voltage and current synchronized data. The HVDC systems are simulated using MATLAB® software. The method for detection of faults in transmission line uses a self-adaptive threshold and presents a redundancy, which allows the detection
Y. Melo, W. Neves, D. Fernandes
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A Transient Protection Scheme for HVDC Transmission Line
IEEE Transactions on Power Delivery, 2012The relation between the parameters of dc transmission line and the variation of transient energy has been analyzed under various fault conditions in this paper. According to that, a new transient energy protective scheme is proposed. It is developed based on the distributed parameter line model in which the transient energy distribution over the line ...
Xiaodong Zheng +3 more
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A novel protection scheme for HVDC transmission line
2011 International Conference on Advanced Power System Automation and Protection, 2011The formation of the transient capacitive current and its effects on the HVDC transmission line differential protection is analyzed based on the wave propagation principle in this paper. The magnitude of capacitive current in the transient process of DC line fault is directly proportional to the time difference of fault signal travelling to both ...
XiaoDong Zheng +6 more
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A Fault Location Method for HVDC Transmission Lines
Applied Mechanics and Materials, 2014A fault location method for HVDC (High Voltage Direct Current) transmission lines is proposed in this paper, using voltages and currents measured at two terminals of dc lines in time domain. Fault traveling waves propagate from the fault point to both terminals along the faulted line.
Lu Hua Xing, Qing Chen, Bing Lei Xue
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A protection system for long HVDC transmission lines
Proceedings of the Inaugural IEEE PES 2005 Conference and Exposition in Africa, 2006A recent review of the currently used HVDC line protection systems clearly indicated that these systems were not adequately equipped to protect HVDC schemes with extremely long HVDC transmission lines. Therefore, considering the increase in HVDC transmission line lengths projected for the future HVDC schemes, it is of vital importance that some type of
D. Naidoo, N.M. Ijumba
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