Results 131 to 140 of about 746 (183)
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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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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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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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Conductor surface voltage gradients on bipolar HVDC transmission lines
IEEE Transactions on Power Apparatus and Systems, 1976The method of successive images is used to obtain accurate values of maximum surface voltage gradients for practical HVdc transmission lines. The results are presented in the form of graphs of gradient factors as a function of the principal line parameters.
Morris, R. M., Maruvada, P. S.
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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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EM Environmental Evaluation of HVDC Transmission Lines
The 2006 4th Asia-Pacific Conference on Environmental Electromagnetics, 2006Due to the high voltage operation of transmission lines, corona discharge phenomena are quite common around AC and DC transmission lines. A large amount of positive and/or negative ions are generated during the corona processes. The effects of corona space charge arising from HVDC transmission lines are much more significant than that in AC ...
Huiliang Zhao +3 more
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Power Line Carrier Application Considerations Involving HVDC Transmission
IEEE Transactions on Power Apparatus and Systems, 1980When applying a power line carrier system involving HVDC transmission, the HVDC system characteristics should be understood. Expected carrier noise levels on the DC line and on the adjacent, parallel or crossing AC lines must be known to ensure proper application of carrier.
G. Bacon +3 more
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Corona Loss Characteristics of Practical HVDC Transmission Lines, Part I: Unipolar Lines
IEEE Transactions on Power Apparatus and Systems, 1970The method of calculating corona losses, developed for unipolar operation mode, is used in the paper to study corona loss characteristics of several practical HVDC transmission lines. Detailed results on the influence of various line parameters upon corona loss characteristics of monopolar lines with single as well as bundle conductors, of homopolar ...
Maruvada Sarma, W. Janischewskyj
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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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Adaptive Reclosing Method for Flexible HVDC Transmission Lines
2020 4th International Conference on HVDC (HVDC), 2020With the development of HVDC transmission, half-bridge modular multilevel converter with hybrid HVDC circuit breakers becomes one of the mainstream configuration schemes in HVDC flexible system. However, the existing reclosing strategies have some defects, such as lack of selectivity and adoption of long time delay, due to the inability to determine ...
Mengxi Wang +2 more
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