Results 171 to 180 of about 11,006 (219)
Some of the next articles are maybe not open access.
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
Test Line Experience with HVDC Overhead Transmission
IEEE Transactions on Power Apparatus and Systems, 1970Tests were conducted on a high-voltage overhead direct-current test line. Values of radio interference and corona loss were established for certain conductor configurations and pole spacings. Relations between radio interference and corona loss and some weather variables were evaluated.
openaire +1 more source
Electromagnetic interference due to HVDC transmission line faults
2012 China International Conference on Electricity Distribution, 2012This paper presents a study of electromagnetic interference to pipelines due tonearby 500 kV HVDC transmission line faults.While there is a large volume of publications addressing the issues of alternating EMI issues, the authors are not aware of publicly available publications addressing the issues of inductive interference from HVDC lines under fault
Yixin Yang +3 more
openaire +1 more source
Asymmetrical design of VSC-based HVDC transmission lines
2012 IEEE Power and Energy Society General Meeting, 2012The advent of VSC-based overhead dc transmission allows reversal of power direction by reversing current flow rather than voltage polarity. This, in turn, allows the poles of HVdc line to be designed independently, taking advantage of polarity-based differences in insulation strength, radio and audible noise generation, and ground-level electric field ...
R. Adapa, L. Barthold, D. Woodford
openaire +1 more source