Results 141 to 150 of about 746 (183)

A protection system for long HVDC transmission lines

Proceedings of the Inaugural IEEE PES 2005 Conference and Exposition in Africa, 2006
A 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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Test Line Experience with HVDC Overhead Transmission

IEEE Transactions on Power Apparatus and Systems, 1970
Tests 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.
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Electromagnetic interference due to HVDC transmission line faults

2012 China International Conference on Electricity Distribution, 2012
This 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, Jinxi Ma, Simon Fortin, Farid Dawalibi   +3 more
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Asymmetrical design of VSC-based HVDC transmission lines

2012 IEEE Power and Energy Society General Meeting, 2012
The 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
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Fault transient simulation analysis for HVDC transmission lines

2015 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT), 2015
Fault transient analysis plays an important role in protection and fault location research for high voltage direct current (HVDC) transmission lines. Fault transient simulation methods and analysis for HVDC transmission lines are detailed presented in this paper, to avoid repetitive tasks and waste of research efforts. Influences of the control system,
Luhua Xing, Dong Yang, Dandan Zhang, Wenbo Li, Qing Chen   +4 more
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A Fault Location Method for HVDC Transmission Lines

Applied Mechanics and Materials, 2014
A 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 novel protection scheme for HVDC transmission line

2011 International Conference on Advanced Power System Automation and Protection, 2011
The 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, NengLing Tai, GuangLiang Yang, HaoYin Ding, ShuJie Sun, ZhiQian Bo, NaiHu Li   +6 more
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A Transient Protection Scheme for HVDC Transmission Line

IEEE Transactions on Power Delivery, 2012
The 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, Tai Nengling, Yang Guangliang, Ding Haoyin   +3 more
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The fault location method for HVDC transmission line

2006 China International Conference on Electricity Distribution (CICED 2006), 2006
The integrative fault location approach which combines the single terminal, dual terminals traveling wave location method and traditional fault location method has been brought forward. The new approach could fetch up the deficiency of the dual terminals traveling wave location method. The possible unsuccessful case of traveling wave fault location has
null Yongchang Zhai, null Haifeng Zhang
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Degree of corona saturation for HVDC transmission lines

IEEE Transactions on Power Delivery, 1990
The DC electric field and ion density are two of the electrical quantities of interest that characterize the electrical environment of HVDC (high-voltage direct-current) transmission lines. The author presents an overview of the electric field and ion environment of HVDC transmission lines and introduces the concept of degree of corona saturation.
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