Proceedings ArticleDOI
A Computer Based System For EHV Line Monitoring And Control
C. T. Nguyen,H.H. Le,Y. Robichaud,K. Srinivasan,G. Santerre +4 more
- pp 284-287
TLDR
A real-time digital data-acquisition and processing system has been operating continuously since late May 78 in an Hydro-Quebec 735 kV substation and the actual implementation is described and the operating experience is reported.Abstract:
A real-time digital data-acquisition and processing system has been operating continuously since late May 78 in an Hydro-Quebec 735 kV substation. This paper describes the actual implementation and reports the operating experience. The prototype was developped in the first stage of a research project on computer-based line protection. The software is designed to accomodate (i) relaying algorithm (ii) auto verification (iii) self-evaluation and (iv) communication functions. All these functions are performed on line. Relaying algorithm consists of a one-cycle Fourier analysis and a continuous calculation of impedances. The sampling rate is controlled by the computer to synchronize to the power system frequency. Upon detection of a perturbation, five to fifty cycles of rel evant voltage and current waveform samples are "frozen" and transmitted via a phone link to IREQ main computer for permanent storage and further processing. Performances of the protection algorithm are evaluated auto matically against the actual protection system. An auto-answer modem allows the control of the remote system.read more
Citations
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Journal ArticleDOI
Load Response Coefficients Monitoring System : Theory and Field Experience
TL;DR: In this article, a mobile mini-computer based load response coefficient monitoring system has been conceived and tested, based on an estimation procedure requiring no test perturbations, at two Hydro-Quebec 120 kV substations.
Journal ArticleDOI
Errors in Digital Measurement of Voltage, Active and Reactive Powers and an on-Line Correction for Frequency Drift
TL;DR: In this article, errors in digitally measured power system variables under non-ideal conditions namely, off-nominal frequency, finite word length sampling and harmonics are obtained by simulation and a new and efficient correction term for errors due to frequency drift is derived theoretically and its effectiveness is also illustrated.
Journal ArticleDOI
Static Compensator Loss Estimation from Digital Measurement of Voltages and Currents
TL;DR: In this paper, the authors deal with a procedure for direct measurement of the active power dissipated by the reactor arm of a static compensator in operation and examine the precision of the loss measurement as influenced by the distorsion of the waveform, sampling rate of the data acquisition system, the phase errors introduced by the current and voltage interfaces and the analog-to-digital conversion.
Book ChapterDOI
Microcomputer Applications in Power System Substation Automation
TL;DR: The object of this chapter is to describe power system applications of microcomputers, particularly in the area of power substation automation, where a microprocessor-based system was designed to virtually accommodate any substation configuration.
References
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Journal ArticleDOI
Fault Protection with a Digital Computer
TL;DR: In this article, a fundamental basis has been developed for the use of a time-shared stored-program digital computer to perform many of the electrical power-system protective-relay functions in a substation.
Journal ArticleDOI
An improved method for the digital protection of high voltage transmission lines
Ali Mohammad Ranjbar,B.J. Cory +1 more
TL;DR: In this paper, the accuracy of the digital methods for protection of high voltage transmission lines under transient fault condition on a long line was explored and an improved method for future digital protection schemes.
Journal ArticleDOI
Relaying a Three Phase Transmission Line with a Digital Computer
B. J. Mann,I. F. Morrison +1 more
TL;DR: In this paper, a digital computer program for the protection of a three-phase transmission line is described, which detects the presence of a disturbance, classifies the fault into one of six fault types and determines the modulus and phase of the impedance of the faulted line.
Journal ArticleDOI
Sampling for Computer Protection of Transmission Lines
G.S. Hope,V. S. Umamaheswaran +1 more
TL;DR: In this article, some of the possible orthogonal sampling techniques for determining instantaneous values of current and voltage to facilitate digital protection of transmission lines are examined by comparison of their frequency spectra.
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.