Results 191 to 200 of about 6,262 (228)

Testing dynamic characteristics of overcurrent relays

IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings, 2002
Test methods for determining the dynamic characteristics of an overcurrent relay are discussed. By dynamics is meant the response of the relay to a current of varying magnitude. The test method, originated by IREQ, is used by Hydro Quebec to determine the ability of new relays to coordinate with the installed base of induction relays.
G. Benmouyal, S.E. Zocholl
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Sensitivity improvement of time overcurrent relays

Electric Power Systems Research, 2007
In this paper, we recommend a new adaptive function for time overcurrent relays. The purpose of the adaptation process is to improve the sensitivity of time overcurrent relays, which then operate with a dynamic pickup setting such as a load current. The results obtained from time overcurrent adaptive relays are collated, and the results from analysis ...
Arturo Conde Enríquez, Ernesto Vázquez Martínez   +1 more
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A new one-cycle directional overcurrent relay

Electrical Engineering, 1943
This paper describes a new one-cycle directional overcurrent relay which is not limited in its application by lack of contact co-ordination. That contact coordination is important is indicated by the many incorrect relay operations which have been traced to the common practice of adding instantaneous attachment to directional overcurrent relays.
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Much more than an overcurrent relay

IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting, 2002
The introduction of the microprocessor into the design of power system static overcurrent relays has led to numerous advances in capability. The addition of functionality beyond nominal overcurrent protection is one of the more profound changes made possible by advanced technology. This paper describes those functions added to a relay developed for use
B. Bailey, J. Mizener, M. Bentley
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Designing of Numerical Directional Overcurrent Relay

2018 International Conference on Smart Electric Drives and Power System (ICSEDPS), 2018
This paper gives an insight into designing of numerical directional over-current relay for distribution system using real time signals. For fault detection differential sampling method is used. Real time signals are converted in discrete form using an advanced analog to digital conversion device Advantech USB 4711/A.
Rupal Agarwal, T. G. Arora, Rajeshri Tiwari   +2 more
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Overcurrent Relay

2023
Samir I. Abood, John Fuller
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Interrupt-driven microprocessor-based overcurrent relay

IEEE Transactions on Industrial Electronics, 1991
An interrupt-driven overcurrent relay for power systems using the 8085 microprocessor is presented. The relay requests processing time from the microprocessor only when a fault occurs. In this way, the microprocessor is given the opportunity to run other tasks such as diagnostic tests online during normal conditions. >
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How to Select Overcurrent Relay Characteristics

IEEE Transactions on Applications and Industry, 1963
One table herein lists induction overcurrent relays, available from the various manufacturers, along with equivalent time versus current characteristics. Another table gives relay types and current ranges suitable for phase and ground protection of 12 of the most commonly encountered industrial plant distribution and motor circuits.
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Directional overcurrent relays

2021
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Overcurrent Relay Using Voltage Control

2021 International Conference on Computational Performance Evaluation (ComPE), 2021
Jitendra Nath Rai, Ajendra Singh, Aarti Aarti   +2 more
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