Results 21 to 30 of about 3,255,424 (314)

Protection of power transformer using microcontroller-based relay [PDF]

, 2002
This paper describes the design and implementation of the micro controller-based system for protecting power transformer. The system includes facilities for discrimination between internal fault current and magnetizing inrush current, differential ...
Bashi, Senan Mahmood, Mailah, Nashiren Farzilah, Mariun, Norman, Rafa, A., Wan Hasan, Wan Zuha   +4 more
core   +1 more source

A Switch Partial Turned OFF Cycle by Cycle Current Limiting Method for 3L-NPC Half-Bridge Inverters

IEEE Access, 2020
Instantaneous hardware protection is a very important method to protect inverters at the moment of over current or short circuit fault. For standalone inverters, the hardware protection can also be modified to achieve current limiting during the over ...
Xun Gao, Li Zhang, Jianxin Zhu, Fan Wu, Yu Fang, Yan Xing   +5 more
doaj   +1 more source

Adaptive protection coordination scheme in microgrids using directional over-current relays with non-standard characteristics

Heliyon, 2021
Protection coordination of AC microgrids (MGs) is a challenging task since they can operate either in grid-connected or islanded mode which drastically modifies the fault currents.
Sergio D. Saldarriaga-Zuluaga, Jesús M. López-Lezama, Nicolás Muñoz-Galeano   +2 more
doaj   +1 more source

An Improved Inverse-Time Over-Current Protection Method for a Microgrid with Optimized Acceleration and Coordination

Energies, 2020
This paper presents an improved inverse-time over-current protection method based on the compound fault acceleration factor and the beetle antennae search (BAS) optimization method for a microgrid.
Liang Ji, Zhe Cao, Qiteng Hong, Xiao Chang, Yang Fu, Jiabing Shi, Yang Mi, Zhenkun Li   +7 more
doaj   +1 more source

Application of multiple resistive superconducting fault-current limiters for fast fault detection in highly interconnected distribution systems [PDF]

, 2013
Superconducting fault-current limiters (SFCLs) offer several benefits for electrical distribution systems, especially with increasing distributed generation and the requirements for better network reliability and efficiency.
Blair, Steven Macpherson, Booth, Campbell, Bright, C.G., Burt, Graeme   +3 more
core   +1 more source

Over-current protection scheme for SiC power MOSFET DC circuit breaker [PDF]

2014 IEEE Energy Conversion Congress and Exposition (ECCE), 2014
The electronic circuit breaker used in DC microgrids are required to work within their safe operating areas bounded by temperature, voltage and current limits. Traditional approach managed to protect these switches through rapid current cut-off operations at over-load or fault situations, but failing to avoid the disturbance induced by transient ...
Zhang, Yuan, Liang, Yung C.
openaire   +2 more sources

Inverse time overcurrent optimization of distribution network with DG based on improved gray wolf algorithm

Energy Reports, 2022
Inverse time overcurrent protection can be applied to distribution networks with distributed power sources because of its superior protection characteristics, but its time limit coordination and value setting are complicated, which limits its large-scale
Yang Yu, Ruien Bian, Tongwen Wang, Wei Wang, Jun Zhang   +4 more
doaj   +1 more source

Punctuated equilibria and 1/f noise in a biological coevolution model with individual-based dynamics [PDF]

, 2003
We present a study by linear stability analysis and large-scale Monte Carlo simulations of a simple model of biological coevolution. Selection is provided through a reproduction probability that contains quenched, random interspecies interactions, while ...
A. Roberts, B. Drossel, C.C. Wilmers, C.E. Shannon, C.E. Shannon, C.M. Newman, D. Chowdhury, E. Tüzel, E. Tüzel, F. Daerden, I. Procaccia, I.D. Rozdilsky, J. Davidsen, J. Maynard Smith, J.A.J. Metz, K. Christensen, M. Doebeli, M. Eigen, M. Eigen, M. Hall, M. Howard, M.E. Gilpin, M.E.J. Newman, M.E.J. Newman, M.R. Gardner, P. Bak, P. Bak, P. Bak, P.A. Rikvold, P.A. Rikvold, P.F. Verhulst, P.H. Leslie, P.H. Leslie, Per Arne Rikvold, R. K. P. Zia, R.M. May, R.V. Solé, R.V. Solé, S.A. di Collobiano, S.A. Kauffman, S.J. Gould, S.J. Gould, T. Tregonning, T.J. Penna   +43 more
core   +1 more source

Protective coordination of main and backup overcurrent relays with different operating modes of active super-conducting current controller [PDF]

Maejo International Journal of Science and Technology, 2014
Active superconducting current controllers (ASCCs) are new generation of series compensators, which can also be categorised as fault current limiters because of their ability to decrease the fault current continuously.
Ahmad Ghafari, Morteza Razaz, Ghodratollah Seifossadat , Mohsen Hosseinzadeh Soreshjani   +3 more
doaj   +1 more source

Smart Grid Performance Improvement with AC Solid-State Circuit Breaker having Charging and Rebreaking Capabilities

Pakistan Journal of Engineering & Technology, 2022
Although traditional electromechanical circuit breakers have a proven track record as efficient and reliable circuit safety devices. Emerging power distribution technologies and architectures such as DC microgrids require advanced breaking performance ...
Muhammad Zulqair Nain, Tahir Mahmood
doaj   +1 more source