Results 251 to 260 of about 10,043 (292)

Directional ground fault indicator for high-resistance grounded systems

IEEE Technical Conference Industrial and Commerical Power Systems, 2002
Locating ground faults is a difficult and challenging problem for low-voltage power systems that are ungrounded or have high-impedance grounding. Recent work in pilot signals has renewed efforts in developing fault location methodologies. This paper presents a method for directional ground-fault indication that utilizes the fundamental frequency ...
T. Baldwin, F. Renovich, L.F. Saunders
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Grounding for surge-protective devices ground resistance versus ground impedance

2006 IEEE Power Engineering Society General Meeting, 2006
The aim of this paper is to address the often loosely used terms of impedance and resistance as related to grounding, and to educate the reader as to the significant difference between these two terms when contemplating the behavior of grounding systems impressed with transient impulse currents.
A.J. Surtees, F.D. Martzloff, A. Rousseau   +2 more
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Grounding System Parameters and Expression of Ground Resistance

2016
In any electrical circuit network, the circuitry that provides a path between the parts of the circuit and the ground, is known as the grounding system. The grounding system is required for reliable operation of any electrical equipment including generator, transformer, power system tower, and other power system installation under fault conditions.
Md. Abdus Salam, Quazi M. Rahman
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Resistance of grounding systems

Electrical Engineering, 1955
ANALYTICAL expressions for the resistance to infinite ground are found in the technical literature for simple shapes of ground electrodes and wires.1 The present digest aims to establish generally applicable relations for the resistance of more complex configurations such as grids and rodbeds.
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Equipotentiality and grounding Derivation of grounding resistance for equipment

2014 IEEE Symposium on Product Compliance Engineering (ISPCE), 2014
Equipotentiality is one means of preventing electric shock. Grounding is a specific kind of equipotentiality. For most power distribution systems, the resistance of the grounding circuit in an electrical product is critical to establishing equipotentiality. This paper explains equipotentiality and how it provides protection against electric shock. This
openaire   +1 more source

A Practical Approach for Determining the Ground Resistance of Grounding Grids

IEEE Transactions on Power Delivery, 2006
This paper starts from the premise that ground resistance is independent of earth-fault current and presents a new method for calculating the ground resistance of grounding grids using the finite-element method. The results obtained using the method proposed are compared with results measured experimentally and results published by other authors.
null Guemes-Alonso, F.E. Hernando-Fernandez, F. Rodriguez-Bona, J.M. Ruiz-Moll   +3 more
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The measurement of impulse grounding resistance and inductance of grounding network

Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137), 2002
It is well known that accurate measurement of grounding resistance and inductance under impulse voltage is of great importance for safe operation of electrical and electronic equipment. It is the behavior of grounding objects under impulse voltage instead under DC voltage that determine the safe operation of equipment.
null Chen Yunping, null Zha Xiaoming, null Zhao Lei   +2 more
openaire   +1 more source

Notes on Resistance of Gas-Pipe Grounds

Transactions of the American Institute of Electrical Engineers, 1907
Earth connections in electric circuits are frequently made by driving a gas pipe into the ground. Such grounds are of fairly high resistance, and therefore not permissible where a low resistance ground is required. Their great simplicity and cheapness makes them desirable, where very low ground resistance is not necessary, as for discharging static ...
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A new method to decrease ground resistances of substation grounding systems in high resistivity regions

IEEE Transactions on Power Delivery, 1999
Decreasing the ground resistance of a grounding system in high resistivity soil is often a formidable task. A new method is proposed to decrease ground resistances. This method requires three steps: (1) drilling deep holes in the ground; (2) developing cracks in the soil by means of explosions in the holes; and (3) filling the holes with low ...
null Qingbo Meng, null Jinliang He, F.P. Dawalibi, J. Ma   +3 more
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Analysis and comparison of resonance grounding with low resistance grounding

2010 5th International Conference on Critical Infrastructure (CRIS), 2010
The scale of medium voltage networks have been expanding and cables are increasingly used so that nowadays capacitance currents are much greater than before when single line-to-ground faults happen. And the harm of an arcing ground overvoltage is extremely severe in an ungrounded system. To solve the problem put forward, the neutral of a medium voltage
null Lei Li, null Lixiao Duan, null Jingshu Zhou, null Jian Zhang, null Wenzhong Zhou, null Bo Li   +5 more
openaire   +1 more source