Journal ArticleDOI
Seen impedance by impedance type relays during power system sequential disturbances
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TLDR
In this article, the trajectory of the seen impedance by distance type relays during sequential disturbances was investigated using phase coordinate analysis with full machine and system representation, and a case study of seen impedance of the healthy phases during single-phase autoreclose (SPAR) following earth faults and the loss of excitation relay during simultaneous faults, an earth fault in the external system triggering another fault in generator excitation system, were investigated.Abstract:
The trajectory of the seen impedance by distance type relays during sequential disturbances was investigated. For transmission systems, distance relays are known to be the main protection. For generator protection, loss of field relays present a major element of the protection systems. These two impedance type relays are considered. A case study of the seen impedance by the healthy phases during single-phase autoreclose (SPAR) following earth faults and the seen impedance by the loss of excitation relay during simultaneous faults, an earth fault in the external system triggering another fault in the generator excitation system, were investigated using phase coordinate analysis with full machine and system representation. >read more
Citations
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Journal ArticleDOI
A Setting-Free Approach to Detecting Loss of Excitation in Synchronous Generators
TL;DR: It will be shown that after loss of excitation, the rate of change of resistance measured by relay 40 will become negative and remain negative for a while and can be used as a criterion for detecting the loss ofexcitation of a synchronous generator.
Journal ArticleDOI
ANN based pattern classification of synchronous generator stability and loss of excitation
Adel M. Sharaf,Tek Tjing Lie +1 more
TL;DR: In this article, the authors presented a novel artificial intelligence-based neural network (ANN) pattern classification and online detection scheme for a single machine infinite bus system using specific frequency spectra of the hyperplane discriminant vector of machine rotor angle, speed, accelerating power, instantaneous power, voltage, and current using either a perceptron single layer detection scheme or a two layer feedforward ANN for online classification and detection of fault condition causing first swing transient stability or loss of excitation.
Proceedings ArticleDOI
A new adaptive loss of excitation relay augmented by rate of change of reactance
S.R. Tambay,Y.G. Paithankar +1 more
TL;DR: In this article, an adaptive or dynamic loss-of-excitation relay, augmented by suitably selected time-derivatives of impedance seen by the relay, is reported to ensure correct discrimination between genuine loss of excitation and power swing.
Journal ArticleDOI
New technique for adaptive-frequency load shedding suitable for industry with private generation
M.M. Elkateb,M.F. Dias +1 more
TL;DR: In this article, a new principle for adaptive load shedding schemes is investigated, which requires the instant collection of data that can be utilised in analytical formulae for the frequency and its rate of change.
Proceedings ArticleDOI
An investigation into the impedance characteristics of a synchronous generator under loss of excitation condition
P.J. Moore,A. Stangenberg +1 more
TL;DR: In this article, a micromachine-based turbo-alternator simulator was subjected to the loss of excitation condition, which can be detected using a mho-type distance relay.
References
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Journal ArticleDOI
Loss of excitation protection for modern synchronous generators
TL;DR: In this article, the authors present the results of a study into the application and performance of the offset mho distance relay for the loss of excitation protection of synchronous generators.
Journal ArticleDOI
Digital simulation of a synchronous generator in direct-phase quantities
P. Subramaniam,O.P. Malik +1 more
TL;DR: The paper describes a mathematical model for the simulation of a 3-phase synchronous machine using direct-phase quantities, thus obviating the need for any transformation, and enables a unified approach to be adopted in the study of both symmetrical and asymmetrical conditions.
Journal ArticleDOI
Torsional Fatigue of Turbine-Generator Shafts Caused by Different Electrical System Faults and Switching Operations
TL;DR: In this paper, the torsional stresses that occur in large steam turbine-generator shafts due to both planned and unplanned system switching operations are discussed and the benefits of single-pole breaker operation and dividing the output of large generators between different electrical systems are briefly mentioned.
Journal ArticleDOI
Effect of clearing short circuits and automatic reclosing on torsional stress and life expenditure of turbine-generator shafts
TL;DR: In this article, the effects of circuit breaker reclosing, both successful and unsuccessful, and faulty synchronizing on the life expenditure of rotor materials are evaluated. But the effect of repeated instances of such over-stressing on rotor materials is not evaluated.
Journal ArticleDOI
Impedances Seen by Relays During Power Swings With and Without Faults
TL;DR: The authors are at present in a period of power-system development during which it is essential that the best use be made of manpower and materials, and equipment must be re-evaluated and refinements made in the design of apparatus and methods of system control.
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