Read the abstract, see who wrote it and who cites it, and get the citation in APA, MLA, Chicago or Harvard.
About 234 papers for “microprocessor-based relays”
Richard D. Kirby, Ronald M. Schwartz · IEEE Industry Applications Magazine · 2009
This article describes the benefits of microprocessor (muP) relay performance and its capabilities beyond previous protective relaying technologies. This article also discusses a multiple quality-measurement approach to observing, measuring, and then calculating muP relay reliability and unavailability.
Cited by 6
Badri Ram, B.B. Chakravarty · Journal of Microcomputer Applications · 1983
Cited by 0
Microprocessors and Microsystems · 1983
Cited by 0
R. Beaulieu, Peter Buttle, B. K. Campbell et al. · 2002
The integration of control and monitoring functions into microprocessor based protection relays continues to escalate as new relays are introduced. Adaptive relay algorithms are also being applied. This paper explores this trend regarding a multiprocessor-based transformer protection and management relay intended for use on all sizes of power transformers. The benefits of several unique adaptive algorithms are discussed. A flexible user-selected approach to harmonic restraint is described.
Cited by 0
Mahmoud A. Manzoul, Mamoun Suliman · Microelectronics Reliability · 1991
Cited by 3
U. Jayachandra Shenoy, D.B. Fakruddin, K. Parthasarathy · Electric Machines & Power Systems · 1985
ABSTRACT This paper presents a general hardware scheme for testing protective relays using microprocessor based systems. The microprocessor simulates the relaying signals for test purpose and monitors the relay performance. Based on the proposed hardware, a teat procedure for directional overcurrent relays is presented in detail. Typical test results of various routine tests conducted on a commercial single phase directional over-current relay clearly demonstrate the efficacy of the proposed technique for conducting tests on commercial relays.
Cited by 0
Tao Zhu, Xiaorong Xie, Zhu Da-kang et al. · 2006
Computer models of relays play an important role in evaluating the performance of protection systems during system faults and other disturbances. The use of relay models would enable us to investigate the relays with closed-loop simulations and approximate actual relays' characteristics so that their performance can be evaluated for a variety of operation conditions. This paper describes a unified approach for computer-based simulation of microprocessor-based relays. The software relay model developed is a detailed digital model, which closely follows the hardware and firmware architecture of the physical relays. The model is employed for testing the performance of the relay with a variety of simulation tests. Results obtained have verified the effectiveness of the presented method and the relay models.
Cited by 1
Saeed Roostaee, Mini S. Thomas, shbana mehfuz · 2016
ijseries.com is your first and best source for all of the information you’re looking for. From general topics to more of what you would expect to find here, ijseries.com has it all. We hope you find what you are searching for!
Cited by 0
Bruno Osorno · 2009
This paper reviews microprocessor based protective relay (MBPR) systems with emphasis on differential equation algorithms. In the present, the application of protection relaying in power systems, using MBPR systems, based on the differential equation algorithm are valued more than the protection relaying based on any other algorithms, because the algorithm has the advantages of accuracy and easy implementation. MBPR differential equation approach can tolerate some errors caused by power system abnormality such as DC offset. It is widely implemented in the protections for lines, transformers, buses, motor, and other equipment in power systems. However, the parameters for system description algorithms are obtained from power system current i(t) or voltage v(t), which are abnormal values under fault or distortion situations. So the error study for the algorithm is considered necessary.
Cited by 3
Terence Hazel, Jacques Tastet, N. Quillion et al. · 2002
The use of microprocessor based multifunction relays is on the increase due to the advantages they offer such as communications, measurements, simplified wiring, and reduced space requirements. Since many protection functions are included in one device however, there has been some concern about providing adequate protection should a multifunction relay fail. A reliable protection scheme is very important in order to protect capital equipment and operating personnel, and reduce down time by selectively clearing faults. This paper analyses some of the different means that have been used to achieve satisfactory levels of back-up protection using microprocessor based multifunction protection relays featuring the protection functions normally provided in large petrochemical plants.
Cited by 3
Y. Ohura · IEEJ Transactions on Power and Energy · 1992
In Tokyo Electric Power Company, we are advancing the digitalization of the protection relay to improve the performance of power system protection and to free us from troubulesome maintenance of protection relay. At present, around a half of the whole relays used in 500kV and 275kV power systems are microprocessor-based relays, so-called digital type relays, and in the other power systems around one third are digital type relays. Therefore we require high level reliability of digital type relay and it is now in higher level than the conventional solid state relay's.This paper describes the classification of the hardware failure of digital type relay and also shows the effective methods to improve its reliability. Methods for reducing the failure and the bad influence on the performance of the relay are introduced. It is found that aging test of the relay in higher temperature and heat cycle test in severer condition are very effective to be reappeared the failure that does not occur continuously and to find out the failure component. And as a result, we are able to reduce the failure rate of the components made from semiconductors such as digital type IC by applying these testing methods to screening test of the components.
Cited by 0Open access
T.S. Sidhu, M. Hfuda, Manoj Sachdev · 2002
This paper presents a technique for automatic generation of software models for any type of microprocessor-based relay. The proposed technique has been developed into an interactive software package which collects relay specifications and produces a software model for the intended relay. The generated models also provide animated performance display during simulation runs and include tools for post analysis of online computed parameters. To demonstrate the accuracy of the proposed technique, software models for an overcurrent relay and a distance relay were produced and tested. Their performance was compared against results obtained from testing the physical relays. The comparisons proved the generated models to be very accurate in calculated parameters and trip timings. Some results are included in the paper.
Cited by 2
S.E. Zocholl, David Costello · 2009
High-impedance bus differential relays have been applied successfully for decades. These relays are preferred for many reasons, including their speed, security, and ease of setting and wiring, as well as the high number of breakers that can be included in the zone of protection. However, these relays present challenging application considerations. The relationship between the CT knee-point voltage and the relay setting voltage remains mysterious to many. This paper provides a review of the high-impedance differential principle. It details the performance of CTs used in high-impedance applications and shares the CT and relay current waveforms experienced during primary high-current laboratory testing. The paper explains the resulting digitally filtered signal used by the relay. It also investigates dependability for internal faults, including sensitivity for low-magnitude faults, and security for external faults. Throughout the paper, practical application guidelines are provided for common and challenging applications.
Cited by 8
Fuel and Energy Abstracts · 1996
Cited by 2
Kris Qin, Lin Ding, Lana Zhu · 2019
With the introduction of microprocessor-based relays, a low-cost Fast Bus Tripping Scheme can be implemented to provide a fast and selective solution for faults on distribution buses. The scheme consists of microprocessor-based overcurrent relays installed for each feeder and for each main supply. Fast Bus Tripping Scheme is designed to speed up clearing time for a distribution bus fault with a resultant decrease in the arc flash hazard. This paper elaborates a Fast Bus Tripping Scheme design example for three sections of the distribution buses under all operating scenarios, presents key considerations identified during design practice from different perspectives, such as CT connection arrangement, applied protection functionalities, relay time coordination and relay communication methods. Recommendations have been provided accordingly.
Cited by 1
J.O Aibangbee, S.O Onohaebi · International Journal of Engineering Trends and Technology · 2015
Cited by 2
A. Apostolov · 2003
The electric power industry is in the process of intensive integration of intelligent electronic devices in substations and power systems. The success of this effort is to a great extent a function of the development of a universal platform that will allow microprocessor based protection and control devices to interoperate over the substation local area network or the utility wide area network. Microprocessor based multifunctional protective relays are the preferred intelligent electronic device (IED) in today's substation integration or substation automation systems. However, the process of relay integration is slowed down by the fact, that each relay manufacturer typically uses a proprietary communications protocol and user interface software.
Cited by 4
Dugui Wu, Zhiheng Xu · IEEE PES Transmission and Distribution Conference and Exhibition · 2003
During the last 10 years, microprocessor-based protection relays in China had been developing rapidly. Until now, three generations of microprocessor-based protection relay products had been developed. The third generation products are playing an important role in assuring the safety and normal operation of electrical apparatus and power networks and the fourth generation protection relays are being developed. The paper firstly reviews the microprocessor-based protection relays development history in China, and then briefly introduces the present development state of protection relay, including hardware system and protection principles or algorithms widely adopted in new protection relays. Finally, the paper describes the customer future demand and development trends.
Cited by 4
G. Benmouyal · IEEE Power Engineering Review · 1982
Cited by 9
Gary H. Fox · IEEE Transactions on Industry Applications · 2005
This paper discusses the issues that can exist when applying multifunction microprocessor-based protective relays in switchgear that has alternating current (ac) control voltage rather than a direct current (dc)-battery-based control bus. The paper recommends several techniques for overcoming these issues.
Cited by 4