Distributed Induction Generators: 3 - Phase Bolted Short - Circuit Fault Currents

2007 ◽  
Author(s):  
Tomasz Sulawa ◽  
Zivan Zabar ◽  
Dariusz Czarkowski ◽  
Yariv Ten-Ami ◽  
Leo Birenbaum ◽  
...  
Keyword(s):  
Short Circuit ◽  
Induction Generators ◽  
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

Variable-Speed Wind Turbines with Doubly-Fed Induction Generators Part III: Model with the Back-to-back Converters

2003 ◽  
Vol 27 (2) ◽  
pp. 79-91 ◽  
Author(s):  
Vladislav Akhmatov
Keyword(s):  
Wind Turbines ◽  
Short Circuit ◽  
Practical Investigations ◽  
System Stability ◽  
Variable Speed ◽  
Induction Generators ◽  
Doubly Fed Induction Generators ◽  
Set Up ◽  
Doubly Fed ◽  
Short Circuit Fault

A model of the back-to-back converter is set up and implemented in the simulation tool PSS/E as a user-developed model. This model is applied with that of the doubly-fed induction generator (DFIG), described in previous parts of this work [parts II and I]. The latter models variable-speed wind turbines in power stability investigations. Subjected to a short circuit fault, there will be a risk of converter blocking, followed by tripping of the wind turbine [1, 3]. The main reasons of blocking are over-current in the rotor converter and over-voltage in the dc-link. The DFIG model, with representation of the back-to-back converter, results in (a) more accurate replication of the current in the rotor converter and (b) improved computation of the dc-link voltage. These improvements are compared with the model with representation of the rotor converter only. Hence, the DFIG model with representation of the back-to-back converters might be preferred, in practical investigations of power system stability, to models with representation of the rotor converter only.

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.

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