Journal Article10.1109/CJECE.1993.6592926
A microprocessor-based measuring unit for high-speed distance protection
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TL;DR: The unit uses an algorithm that provides accurate estimates of apparent resistance and inductance of the line in relatively short times and deals effectively with the presence of nonfundamental frequency components in signals without making assumptions about their compositions.
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Abstract: This paper describes a microprocessor-based measuring unit which is suitable for use in high-speed digital distance relays. The unit uses an algorithm that provides accurate estimates of apparent resistance and inductance of the line in relatively short times. The algorithm deals effectively with the presence of nonfundamental frequency components in signals without making assumptions about their compositions. The hardware and software of the unit are described. Test results indicate that the estimates converge to their true values within about 10 ms after fault inception. Also, the ability of the unit to provide accurate estimates is not adversely affected by the system frequencies drifting from its nominal value and by the distortion of the input signals.
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Citations
Further enhancements in the symmetrical components based improved fault impedance estimation method Part I. Mathematical modelling
TL;DR: In this article, the authors developed an approach that can be used for further enhancement of the symmetrical components based improved fault impedance estimation method that has previously been proposed by the authors.
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Improved symmetrical component-based fault distance estimation for digital distance protection
Y. Liao,S. Elangovan +1 more
- 01 Nov 1998
TL;DR: In this paper, an improved symmetrical component-based method is proposed, which uses phasor estimates of voltage and current samples obtained from both ends of a transmission line to determine the fault location.
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Further enhancements in the symmetrical components based improved fault impedance estimation method Part II. Performance evaluation
TL;DR: In this article, an approach that can be used for further enhancing the symmetrical components based improved fault impedance estimation method has been proposed by the authors in Part-I of this companion paper.
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Computer-based protection: recent advances and future directions
Tarlochan S. Sidhu
- 17 Dec 1998
TL;DR: This paper outlines the most significant developments in the area of power system protection and describes the progress made related to subjects of relay algorithms, adaptive relaying, relay testing and modeling, and relay hardware.
2
Numerical algorithms for protection and metering devices
01 Jan 2023
TL;DR: In this paper , the numerical algorithms used in the protection and metering devices are discussed, and a collection of digital samples, known as a window, acquired at regular intervals in this manner are further processed by the algorithms to achieve protection and meter functions.
References
The Laboratory Investigation of a Digital System for the Protection of Transmission Lines
TL;DR: In this paper, the authors presented a feasibility study of a digital system for the protection of transmission lines, where a computer with its data acquisition system was connected to a transmission line model and extensive testing with a wide range of fault types, fault locations, fault inception angles, and power flows demonstrated the success of the system.
74
Parameter Estimation for Continuous Time Models - A Survey
TL;DR: The paper reviews the progress of research on parameter estimation for continuous-time models of dynamic systems over the period 1958-78 and the major accent is on research in the control and systems field.
62
A Prototype of Multiprocessor Based Distance Relay
P. Bornard,J. C. Bastide +1 more
TL;DR: The algorithm which has been used and the main principles of operation are described, and a prototype has been built with four 16-bit microprocessors, to allow the simultaneous real-time computation of three apparent impedances.
49
Digital distance relay with improved characteristics against distorted transient waveforms
TL;DR: In this article, a microprocessor-based digital distance relay with improved performance in relation to low-frequency transient oscillation is introduced, and new calculation algorithms for the distance element and directional element are discussed.
27
Implementation of a digital distance relay using an interpolated integral solution of a differential equation
TL;DR: In this article, an integral method with an interpolation technique is applied using a very limited number of data at a sampling rate of 600 Hz, which is verified to have an accuracy of + or 5% and require an operating time of less than 50 ms.
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