Journal ArticleDOI
Digital differential protection of a generating unit scheme and real-time test results
G.S. Hope,P.K. Dash,O.P. Malik +2 more
TLDR
In this article, an on-line digital computer technique is used for differential protection of a synchronous generator, which provides fault detection and tripping well within half a cycle and is also capable of discriminating between internal and external faults.Abstract:
This paper presents an on-line digital computer technique used for differential protection of a synchronous generator. It provides fault detection and tripping well within half a cycle and is also capable of discriminating between internal and external faults. In the latter case, sufficient restraint signals are generated to overcome maloperation. Further, the scheme is highly reliable even with CT saturation due to heavy through faults on the generating unit. On-line tests using a laboratory synchronous generator show the results for different types of internal and external faults with varying fault incidence inception.read more
Citations
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Journal ArticleDOI
An artificial neural network based digital differential protection scheme for synchronous generator stator winding protection
A.I. Megahed,Om P. Malik +1 more
TL;DR: In this article, a new artificial neural network (ANN) based digital differential protection scheme for generator stator winding protection is described. But the scheme only uses two ANNs, one for fault detection and the other for internal fault classification.
Journal ArticleDOI
A New Internal Fault Detection and Classification Technique for Synchronous Generator
TL;DR: Comparative assessment of the proposed scheme in terms of detection time and incorporation of different types of faults with the existing techniques proves its superiority.
Journal ArticleDOI
Fast generator protection against internal asymmetrical faults
P.K. Dash,O.P. Malik,G.S. Hope +2 more
TL;DR: In this paper, an on-line digital computer technique for the protection of a generator against internal asymmetrical faults is described, which relies on the detection of a second harmonic component in the field current at the onset of a fault in the armature winding.
Journal ArticleDOI
A digital technique for stator winding protection of synchronous generators
TL;DR: In this article, a digital technique for detecting internal faults in stator windings of synchronous generators is described, which does not need information concerning the machine parameters and is applicable to all types of generators, irrespective of their size.
Journal ArticleDOI
Survey of experience with generator protection and prospects for improvements using digital computers
W.D. Breingan,C.H. Castro,J.R. Latham,J. Mescua,A.G. Phadke,J.M. Postforoosh,E.O. Schweitzer,W.M. Strang,F.Y. Tajaddodi,E.A. Udren +9 more
TL;DR: The IEEE Working Group on Generator Protection with Digital Computers surveyed power industry engineers to determine what problems are generally encountered and for which adequate protective devices are not available as mentioned in this paper, and two surveys were conducted: one to identify the problems; and the other to determine how prevalent they are.
References
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Journal ArticleDOI
High speed transmission line fault impedance calculation using a dedicated minicomputer
J.G. Gilbert,R.J. Shovlin +1 more
TL;DR: In this article, an algorithm for calculating apparent transmission line impedance to the point of a fault is presented as an approach to distance type protection via a dedicated digital computer, where phase voltages and currents are sampled asynchronously approximately 24 times per cycle and operated on to yield apparent resistances and reactances.
Journal ArticleDOI
Frequency domain analysis applied to digital transmission line protection
J. Carr,R.V. Jackson +1 more
TL;DR: In this paper, a complete signal processing technique is designed on the basis of a frequency domain analysis of the protection requirements, and such factors as analog filtering, data window size and sampling frequency are chosen by their frequency characteristics.
Journal ArticleDOI
Generator Differential Protection Using a Hybrid Computer
M.S. Sachdev,D.W. Wind +1 more
TL;DR: In this article, a rea1-time hybrid, analog-digital, computer technique for differential protection of generators is presented, where the fault/no fault decisions are based on the amplitude ratio of the "fault" and "average through" currents from a selected generator phase.
Journal ArticleDOI
Methods for estimating transient performance of practical current transformers for relaying
TL;DR: In this article, the authors present new data and methods which are intended to lead the relay engineer to solutions to many problems and to give him a better insight toward proper action in cases where there is still no simple solution.
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Fast generator protection against internal asymmetrical faults
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