Results 181 to 190 of about 6,262 (228)

Instantaneous Overcurrent Relays for Distance Relaying

Transactions of the American Institute of Electrical Engineers, 1935
Instantaneous 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 ...
openaire   +1 more source

An Improved Static Overcurrent Relay

IEEE Transactions on Power Apparatus and Systems, 1963
This 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
openaire   +1 more source

Operation Logic Proposed for Time Overcurrent Relays

IEEE Transactions on Power Delivery, 2006
This 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
openaire   +1 more source

Overcurrent relay coordination by evolutionary programming

Electric Power Systems Research, 2000
Abstract This paper presents a novel optimization technique based on evolutionary programming for overcurrent (OC) relay coordination in ring fed distribution networks. Since the problem has multi-optimum points, ordinary mathematical based optimization techniques will fail.
C.W. So, K.K. Li
openaire   +1 more source

Directional overcurrent relays

2011
Directional overcurrent protection is used when it is necessary to protect the system against fault currents that could circulate in both directions through a system element, and when bidirectional overcurrent protection could produce unnecessary disconnection of circuits.
openaire   +1 more source

Overcurrent relay on a FPGA chip

Microelectronics Reliability, 1995
Abstract 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
openaire   +1 more source

Adaptive Settings of Directional Overcurrent Relay

2020 International Conference on Electrical Engineering (ICEE), 2020
Power distribution system condition changes dynamically due to presence of distributed energy resources (DERs). This can cause failure of protection system of meshed system. To cope with changing system condition, settings of numerical directional overcurrent relays should be changed accordingly.
Piyusha Ramesh Lidhade, Anil. P. Vaidya
openaire   +1 more source

Time-Overcurrent Relay Coordination: A Review

International Journal of Emerging Electric Power Systems, 2005
When two protective apparatus installed in series have characteristics, which provide a specified operating sequence, they are said to be coordinated or selective. The coordination of directional overcurrent relays poses serious problems in the modern complex power system networks, which are interconnected.
Dinesh Birla, Rudra Prakash Maheshwari, Hari Om Gupta   +2 more
openaire   +1 more source

Non-conventional Overcurrent Relays Coordination

2019
The Invasive Weed Optimization (IWO) algorithm has been adapted for the high dimension coordination problem. Many utilities follow the criterion of increase use of differential protection in transmission lines which has absolute selectivity with no backup function offered.
Erik Cuevas, Emilio Barocio Espejo, Arturo Conde Enríquez   +2 more
openaire   +1 more source

Fault-tolerant microprocessor-based overcurrent relays

Microelectronics Reliability, 1991
Abstract Reliability of relays, the measure of the degree of certainty that the relays will perform correctly, is the most important criteria in designing protective systems. In this paper, the reliability of microprocessor-based overcurrent relays is improved by incorporating the concept of hardware redundancy.
Mahmoud A. Manzoul, Mamoun Suliman
openaire   +1 more source