Calculation and measurement of rail impedances applicable to remote short-circuit fault currents

1993 ◽  
Vol 140 (6) ◽  
pp. 417 ◽  
Author(s):  
R.J. Hill ◽  
D.C. Carpenter ◽  
B. Mellitt ◽  
J. Allan ◽  
J.C. Brown
Keyword(s):  
Short Circuit ◽  
Fault Currents ◽  
Short Circuit Fault

Calculation of Short-Circuit Fault Currents in an Electric Traction Network with Double Ended Power Supply

2019 ◽  
Vol 5 (5) ◽  
pp. 19-23
Author(s):  
Leonid A. GERMAN ◽  
◽  
Alexandr S. SEREBRYAKOV ◽  
Aleksey B. LOSKUTOV ◽  
Vladimir L. OSOKIN ◽  
...  
Keyword(s):  
Power Supply ◽  
Short Circuit ◽  
Fault Currents ◽  
Traction Network ◽  
Electric Traction ◽  
Short Circuit Fault

A new monitoring technique for the grounding grids

2014 ◽  
Vol 4 (3) ◽  
Author(s):  
Y. Chikarov ◽  
T. Lie ◽  
N. Nair
Keyword(s):  
Structural Integrity ◽  
Short Circuit ◽  
Operating Conditions ◽  
Structural Elements ◽  
Protective Relay ◽  
Fault Currents ◽  
Monitoring Technique ◽  
Grounding Grids ◽  
A New Technique ◽  
Short Circuit Fault

AbstractThe performance and reliability of grounding grids depend on its structural integrity. If grounding conductors are damaged, it may cause misoperation of protective relay which leads to trip feeders unnecessarily. It can also cause not only failures on the surroundings such as the grounding grid, secondary circuits’ cables, and structural elements but also voltage hazard for human. The circuits may attain unacceptable voltages when short-circuit fault currents occur in these grids. This paper presents the development of a new technique to monitor the operating conditions of the grounding grids of high voltage apparatus and systems without any diggings and forced outages. New concept, principals, a technique and a device shown in the paper have never been described before by the other authors. The technique is based on the evaluation of the electromagnetic field distribution pattern over the damaged horizontal elements of the grid.

scholarly journals Optimal Relays Coordination Efficient Method in Interconnected Power Systems

2010 ◽  
Vol 61 (2) ◽  
pp. 75-83 ◽  
Author(s):  
Reza Mohammadi ◽  
Hossein Abyaneh ◽  
Farzad Razavi ◽  
Majid Al-Dabbagh ◽  
Seyed Sadeghi
Keyword(s):  
Genetic Algorithm ◽  
Power Systems ◽  
Efficient Method ◽  
Short Circuit ◽  
Network Configuration ◽  
Fault Currents ◽  
Interconnected Power Systems ◽  
Relay Coordination ◽  
Overcurrent Relay ◽  
Short Circuit Fault

Optimal Relays Coordination Efficient Method in Interconnected Power SystemsIn this paper an efficient method for optimal overcurrent relay coordination is proposed. In the proposed method using genetic algorithm, an objective function (OF) is developed to solve the problem of miscoordination for six pairs short circuit fault currents. The new OF is improved to be simple, optimal and efficient. This technique takes into account the changes in network configuration. The efficiency of the proposed technique is demonstrated by comparing the results of two different networks namely typical 8-bus & IEEE 30-bus systems with those obtained using the recently developed techniques.

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