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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.


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors illustrate the way a blackout can be prevented in real time through controlled segregation of a system into a number of viable islands together with generation and/or load shedding.
Abstract: The power systems operated by the utilities in developing countries suffer from a large gap between demand and generation, inadequate transmission capacity, and nonuniform location of the load centers and generating stations. Occurrences of faults in such systems, in most of the cases, end up with the worst consequences (i.e., complete blackout). This paper illustrates the way a blackout can be prevented in real time through controlled segregation of a system into a number of viable islands together with generation and/or load shedding. The nature and location of any fault that warrants such islanding can be ascertained in real time through monitoring the active-power (megawatt) flows at both ends of a number of prespecified lines. The blackout of June 20, 1998 in the Bangladesh Power Development Board system has been used as an example in the illustration. The philosophy of the proposed islanding scheme may be considered for implementation in other power systems also.

74 citations

Journal ArticleDOI
TL;DR: A comparative evaluation of different digital filtering algorithms for distance protection based on Fourier and Walsh transforms is performed, and includes a recently proposed combined sine-cosine filter.
Abstract: Filtering requirements for distance relays are very critical, because they must estimate precisely and quickly the electrical distance to the fault, even with highly distorted input signals. A number of digital filtering algorithms for distance relays have been proposed and some of them are in use in practical relays; however, power system evolution increases the corruption level of signals and imposes the necessity of continuing the research efforts in this area. In the present paper, a comparative evaluation of different digital filtering algorithms for distance protection is performed. An evaluation method is proposed, which gives a comprehensive information about filter transient behavior on a wide frequency range of noise. The discussion is focused in well-known algorithms based on Fourier and Walsh transforms, and includes a recently proposed combined sine-cosine filter.

74 citations

Proceedings ArticleDOI
01 Apr 2016
TL;DR: This paper compares the performance of the time-domain line protection elements with the traditional phasor-based elements of the in-service relays that captured the fault records, and illustrates their operation using real-world faults and digital simulations.
Abstract: Ultra-high-speed line protection is becoming a reality today, giving the industry a way to trip line faults in a few milliseconds. One relay described in this paper that uses time-domain principles incorporates incremental-quantity (TD32) and traveling-wave (TW32) directional elements in a communications-assisted tripping scheme, incremental-quantity distance element (TD21), and traveling-wave differential element (TW87). This paper introduces these time-domain line protection elements, shares key details of their implementation in hardware, and illustrates their operation using real-world faults and digital simulations. By comparing the performance of the time-domain line protection elements with the traditional phasor-based elements of the in-service relays that captured the fault records, we demonstrate the performance of the time-domain line protection elements.

74 citations

Journal ArticleDOI
TL;DR: The past and present uses of relay models are reviewed and the various types of models, what information is required to build such models and the model validation process are discussed.
Abstract: This paper reviews the past and present uses of relay models. It discusses the various types of models, what information is required to build such models and the model validation process. Examples of present and possible future use of software models are given.

74 citations

Journal ArticleDOI
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.
Abstract: This paper explores the accuracy of the digital methods for protection of high voltage transmission lines under transient fault condition on a long line and describes an improved method for future digital protection schemes. With this method it is possible to calculate R and L of high voltage transmission lines so that any number of harmonics on the current and voltage waveforms can be eliminated and it is shown to be suitable for distance protection during the first cycle of fault occurrence.

73 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202335
2022120
202182
2020115
2019132
2018151