Results 211 to 220 of about 298,418 (266)

Charging Current Compensation for Distance Protection

IEEE Transactions on Power Delivery, 2005
When a distance relay is applied to a long transmission line, the capacitance of the transmission line causes oscillation of the distance measurement, although the exact nature of the phenomenon has never been clearly defined. Our research has shown that the degree of oscillation can be reduced significantly by introducing charging current to the ...
T. Kase, Y. Kurosawa, H. Amo
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An Adaptive Approach in Digital Distance Protection

IEEE Power Engineering Review, 1991
Adaptive distance protection can be obtained by forming an adaptive control system, and rules about information, functions, and time sequence must followed in its design. Three adaptive methods are suggested to deal with the following problems: (1) the effect of frequency variation, (2) the effect of fault resistance in single-phase-to-ground faults ...
null Zhang Zhizhe, C. Deshu
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Distance Protection Based on Traveling Waves

IEEE Power Engineering Review, 1983
A technique is presented for rapid measurement of the distance to a fault using fault initiated travelling waves. The measurement uses the time it takes a given surge to travel from the relaying point to the fault and back. A correlation technique is used to recognise the surge returning from the fault and distinguish it from other surges present on ...
P.A. Crossley, P.G. McLaren
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Ultra fast distance protection

10th IET International Conference on Developments in Power System Protection (DPSP 2010). Managing the Change, 2010
The chief advantage that the distance relay has over current-only based line protection schemes is its ability to provide a defined zone of protection without the need for a communications channel a so-called direct tripping, under-reaching zone. This zone must operate for faults within its zone of coverage with no appreciable time delay and restrain ...
D. Finney, null Zhiying Zhang, J. Cardenas   +2 more
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Virtual testing of distance protection

2006 IEEE Power Engineering Society General Meeting, 2006
Distance relays are the most commonly used protection devices in transmission systems. They require testing during different stages of relay development, commissioning, maintenance, configuration and operation analysis. The paper analyses the requirements for testing of distance relays under different abnormal conditions.
A. Apostolov, H. Kang
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Distance protection and voltage stability

PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409), 2002
In this paper the influence of zone 3 distance relays in the case of voltage instability is examined. Different types of relay characteristics are analysed. An adaptive algorithm to prevent undesirable zone 3 operations during voltage instability is proposed. Studies are based on simulations in a fifteen bus system developed by the authors. Data on the
M. Jonsson, J. Daalder
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Distance protection of unsymmetrical lines

European Transactions on Electrical Power, 1996
AbstractTechnical, economical and ecological aspects lead to untransposed power lines. Full transposition schemes are often to expensive and not applicable to short poly‐circuit lines. Therefore line unsymmetry is of importance with respect to the impedance calculation and the setting of distance‐protection relays.
H. Hupfauer, P. Schegner, R. Simon
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Analysis of Distance Protection

2009
This chapter contains sections titled: Introduction Analysis of Transmission Line Faults Impedance at the Relay Distance Relay Settings Ground Distance Protection Distance Relay Coordination References ...
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Earth fault distance protection

IET Conference Publications, 2009
Earth fault distance protection with distance protection relays is common practice in solidly grounded networks. However, in compensated networks earth faults can cause big problems, because they do not extinguish themselves. To find the fault point is from high interest also in combination with network expansion. In previous investigations the authors
G. Achleitner, L. Fickert, C. Obkircher, M. Sakulin   +3 more
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Fault classification for distance protection

IEEE/PES Transmission and Distribution Conference and Exhibition, 2003
This paper presents an overview of power system fault classification methods and challenges. It also contains some ideas about structured testing.
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