Topic
Power-system protection
About: Power-system protection is a research topic. Over the lifetime, 6353 publications have been published within this topic receiving 117961 citations.
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TL;DR: In this article, the authors proposed a method of distance-type protection suitable for on-line digital computer protection of transmission lines, based on the predictive calculation of peak fault current and voltage from a small number of sample values.
Abstract: The paper proposes a method of distance-type protection suitable for on-line digital computer protection of transmission lines. The basic principle is the predictive calculation of peak fault current and voltage from a small number of sample values. The magnitudes of various sources of error are discussed. The results of experimental work on a model transmission line and on a high- voltage transmission system are described. The calculation times for implementation in real time are estimated.
160 citations
01 Oct 2006
TL;DR: In this paper, synchronized phasor measurements are traced from their origins in computer relaying to present applications in power system operation, protection, and control, and two IEEE standards applicable to PMU technology, the COMTRADE standard and the SYNCHROPHASOR standard are summarized.
Abstract: Synchronized phasor measurements are traced from their origins in computer relaying to present applications in power system operation, protection, and control. The principle behind the measurement technique is reviewed along with the details of phasor measurement units (PMUs). Two IEEE standards, applicable to PMU technology, the 'COMTRADE' standard, and the 'SYNCHROPHASOR' standards are summarized. Applications of PMUs to state estimation, measurement based control, adaptive protection, and a new generation of remedial action schemes are described
157 citations
TL;DR: An improved solution based on wavelet transform and self-organized neural network that uses both low and high frequency information of the fault signal to achieve an advanced line protection scheme.
Abstract: Two of the most expected objectives of transmission line protection are: 1) differentiating precisely the internal faults from external and 2) indicating exactly the fault type using one end data only. This paper proposes an improved solution based on wavelet transform and self-organized neural network. The measured voltage and current signals are preprocessed first and then decomposed using wavelet multiresolution analysis to obtain the high frequency details and low frequency approximations. The patterns formed based on high frequency signal components are arranged as inputs of neural network #1, whose task is to indicate whether the fault is internal or external. The patterns formed using low frequency approximations are arranged as inputs of neural network #2, whose task is to indicate the exact fault type. The new method uses both low and high frequency information of the fault signal to achieve an advanced line protection scheme. The proposed approach is verified using frequency-dependent transmission line model and the test results prove its enhanced performance. A discussion of the application issues for the proposed approach is provided at the end where the generality of the proposed approach and guidance for future study are pointed out
156 citations
09 May 2005
TL;DR: The main targets for this paper are to sort out the terminology used in this area, describe different application areas and related requirements, and illustrate different design principles-"top-down", "bottom-up", hierarchy, flat, etc., for different applications.
Abstract: This paper describes basic principles and philosophy for wide-area protection schemes, also known as remedial action schemes (RAS) or system protection schemes (SPS). In the areas of power system automation and substation automation, there are two parallel trends in different directions: centralization and decentralization. More and more functions are moved from local and regional control centers toward the central or national control center. At the same time we also observe more and more "intelligence" and "decision-power" moving closer toward the actual power system process. We also see a great deal of functional integration, i.e., more and more functionality enclosed in the same hardware. This raises discussions concerning reliability (security and dependability). The main targets for this paper is therefore to: 1) sort out the terminology used in this area; 2) describe different application areas and related requirements; 3) illustrate different design principles-"top-down", "bottom-up", hierarchy, flat, etc., for different applications; and 4) identify similarities and differences between classic equipment protection and system protection-concerning philosophy as well as concerning product and system design. The theme of the paper is on the use of information technology to obtain more flexibility and smartness in power-system controls.
156 citations
TL;DR: In this article, a new scheme to locate a fault on a multi-terminal transmission line is described, which can work for transposed as well as untransposed lines and is free of prefault conditions.
Abstract: This paper describes a new scheme to locate a fault on a multi-terminal transmission line. It describes a simple new algorithm to identify the faulted section first. Then, to exactly locate the fault on this section, a method is described that uses the synchronized voltage measurements at all terminals. The main advantage of this method is that the current-transformer errors in the current measurements can be avoided. Since these errors can be as high as 10%, the fault location is extremely accurate with this method. The scheme can work for transposed as well as untransposed lines and is free of prefault conditions. The paper, after describing the scheme, describes very promising results from an Electromagnetic Transients Program simulation of a multi-terminal transmission line.
155 citations