Results 221 to 230 of about 6,985 (272)
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A Field-Programmable Time-Overcurrent Relay
IEEE Power Engineering Review, 1986This paper presents the underlying principles and the test results for a microprocessor based time overcurrent relay. The main feature is the use of a portable pocket computer with an RS-232C communication link for the man machine interface. The calculator serves to enter and modify the set vatues pick up current, instantaneous characteristics.
Gabriel Bienmouval, Sylvain Boismenu
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Overcurrent relay on a FPGA chip
Microelectronics Reliability, 1995Abstract A new hardware approach for implementing overcurrent relays is presented in this paper. An overcurrent relay is implemented on a field programmable gate array (FPGA) chip (Xilinx's XC3020-50-PC84C). The hardware design of the overcurrent relay is based on a three-stage pipelined architecture.
Mahmoud A. Manzoul, Prasad Modali
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Modeling overcurrent relay characteristics
IEEE Computer Applications in Power, 1992An approach to computer modeling of the time-current characteristics of protective devices that relies on interactive manipulation and fitting of the curves, which are modeled mathematically as splines is presented. The approach is much easier to use than the commonly used curve-fitting methods, which are reviewed, and it does not require a digitizer ...
S. Chan, R. Maurer
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An Improved Static Overcurrent Relay
IEEE Transactions on Power Apparatus and Systems, 1963This paper describes the design and application of a new static overcurrent protective relay system. Design goals and physical characteristics are given. Basis for selection of the new time current characteristics is presented, and new curves are compared with existing shapes. Also given are application examples involving fuse coordination, low-voltage
D. Dalasta, F. Free, A. De Snoo
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The effects of harmonics on overcurrent relays
2016 17th International Scientific Conference on Electric Power Engineering (EPE), 2016This paper analyses the influence of current harmonics on protections devices connected to the power system which can cause serious problems. This paper outlines work that has been conducted to test of overcurrent relay and to identify the impacts of harmonics on distribution utility protection and control systems.
Kinan Wannous, Petr Toman
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Effect of relay characteristics in optimum coordination of overcurrent relays
2020 IEEE Students Conference on Engineering & Systems (SCES), 2020The coordination of overcurrent relays require minimum tripping time at maximum fault current while backup relays, experiencing low fault current, follow the coordination criteria. The challenges arise as overcurrent characteristics perform diversely according to the magnitude of fault currents.
Tejas M Vala +3 more
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Instantaneous Overcurrent Relays for Distance Relaying
Transactions of the American Institute of Electrical Engineers, 1935Instantaneous isolation of faults on transmission and distribution lines is ever a problem of the relay engineer. The use of instantaneous overcurrent relays as applied to the system of the Oklahoma Gas and Electric Company is discussed in this paper. Relays of this type were applied in conjunction with already installed overcurrent time delay relays ...
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Correlation functions based directional overcurrent relay
2012 25th IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), 2012This paper describes a new directional overcurrent relay for protection of interconnected distribution network and DG unit. When the relay current exceeds its pick-up value, correlation of the voltage and current at the relay point as well as partial autocorrelation of the current are calculated.
Ebrahim Farjah +2 more
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Operation Logic Proposed for Time Overcurrent Relays
IEEE Transactions on Power Delivery, 2006This paper presents a new logic of operation for time overcurrent relays. With the application of the proposed technique, the sensitivity of time overcurrent relays is increased. In order to obtain this, the relay operates with a dynamic pickup setting, such as load current. Additionally, fast operation of overcurrent relays is obtained. The functional
A. Conde, E. Vazquez
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Design and Implementation of Overcurrent Protection Relay
Journal of Electrical Engineering & Technology, 2020Protective relays have been designed with different technologies resulting in electromechanical, solid-state, and numerical devices. Speed and reliability are the two most important characteristics of a protective relay. Other capabilities such as monitoring and recording are supposed to be of secondary priority. The new technology using combination of
Mohammed Y. Suliman, Mohammed Ghazal
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