Results 271 to 280 of about 1,041,107 (311)

Lightning: earthing electrodes harmonic response

11th International Symposium on High-Voltage Engineering (ISH 99), 1999
The grounding behavior (resistive, capacitive, inductive) to a lightning discharge is related to the electrodes' geometrical dimensions, shapes and the soil characteristics (resistivity /spl rho/, permittivity /spl epsi/, permeability /spl mu/). The border between the capacitive and inductive behaviors corresponds to a frequency value (critical ...
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Quantifying the lightning transient performance of an earth electrode

IEEE AFRICON. 6th Africon Conference in Africa,, 2003
The key question addressed in this paper is: for comparative purposes, what is a meaningful measure of the relative performance of an earth electrode under lightning transient conditions? Several methods of quantifying the transient performance are introduced and evaluated using time-domain transient analysis of equivalent circuits.
K.I. Nixon, I.R. Jandrell
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The current-loading capacity of earth electrodes

Journal of the Institution of Electrical Engineers, 1935
The limits of current-loading capacity of earth electrodes are considered under the three types of conditions which may occur in practice, namely long-duration loading, which occurs where the earth current is insufficiently large to interrupt the supply; short-duration overloading, which occurs when the protective gear operates in the usual way; and ...
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FDTD Transient Analysis of Ring Earth Electrode

Proceedings of the 41st International Universities Power Engineering Conference, 2006
The installation of wind turbine has enjoyed explosive growth worldwide; however, problems regarding interconnectivity to grids have arisen. It has also been pointed out that wind power generation facilities are exposed to lightning damage due to their configurations, and so different protective measures from those needed for conventional generators ...
Yasuda Yoh, Ueda Toshiaki
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Study on Sharing Earth Electrode of UHVDC

2006 International Conference on Power System Technology, 2006
This paper analyzes the different operation modes of the UHVDC system sharing earth electrode from the aspect of power system stable operation. Two UHVDC system rectifiers and inverters sharing earth electrode were studied respectively by electromagnetic transient analysis software EMTP-RV based on the main parameters of Xiang jiaba to Nan hui ...
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Study on Xiluodu and Xiangjiaba UHVDC Earth Electrodes

2006 International Conference on Power System Technology, 2006
Grounding characteristics of linear, star-type and toroidal electrodes are discussed in this paper. Based on the analysis of the performance of double-ring in uniform and horizontal two-layer soils, an electrode model of standard triple concentric rings buried with different depth is presented for plusmn800 kV Xiluodu and Xiangjiaba converter stations ...
Mingde Cui, Lianguang Liu, Zhongming Sun
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Earth-electrode systems for large electric stations

Proceedings of the IEE Part A: Power Engineering, 1957
Interconnected systems have increased considerably in recent years, and the large possible earth-fault currents resulting require further thought being given to earth system design, especially in areas of high soil resistivity. The paper discusses the special practical problems of the design, construction and testing of earth electrode systems for ...
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Grounding resistance of a single earthing electrode

Modern Problems of Telecommunications - 2024. Proceedings of Russian Scientific and Technical Conference
On traditional (copper) and fiber-optic communication lines, grounding is installed to protect the lives of workers and subscribers, as well as equipment and communication cables. For better protection, the grounding resistance should be low. Therefore, grounding is performed by a multi-electrode circuit of parallel connected single earth electrodes ...
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Design of UHVDC earth electrode

2014 International Conference on Power System Technology, 2014
null Yuan Shichao, null Gong Xiangyang, null Luo Yi   +2 more
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Optimal Safety Earthing – Earth Electrode Sizing Using A Deterministic Approach

2013
In this paper a deterministic approach in the sizing of earth electrode using the permissible touch voltage criteria is presented. The deterministic approach is effectively applied in the sizing of the length of earth rod required for the safe earthing of residential and facility buildings.
Ubeku, EU, Ogbeide, OK
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