Results 1 to 10 of about 125,561 (280)

An enhanced protection scheme for power transformers integrating alpha plane analysis [PDF]

Scientific Reports
Power transformers play a critical role in electric power systems by facilitating connections between subsystems with different voltage levels. Ensuring their reliable operation and protection against faults is essential for maintaining network stability.
Ahmed S. Sayed, Ehab M. Nabil, Almoataz Y. Abdelaziz, Mohit Bajaj, Ievgen Zaitsev   +4 more
doaj   +2 more sources

Improving the Protection of Step-Down Transformers by Utilizing Percentage Differential Protection and Scale-Dependent Intrinsic Entropy [PDF]

Entropy
Transformer operations are susceptible to both internal and external faults. This study primarily employed software to construct a power system simulation model featuring a step-down transformer.
Chia-Wei Huang, Chih-Chiang Fang, Wei-Tai Hsu, Chih-Chung Yang, Li-Ting Zhou   +4 more
doaj   +2 more sources

Design of Hardware Setup Based on IEC 61850 Communication Protocol for Detection & Blocking of Harmonics in Power Transformer

Energies, 2021
In this paper, the authors have developed a hardware model for blocking even and odd harmonics of a power transformer. In the proposed hardware model, intelligent differential & over-current relays are used for the blocking of harmonics of a power ...
Abdul Azeem, Majid Jamil, Shamimul Qamar, Hasmat Malik, Rayees Ahmad Thokar   +4 more
doaj   +1 more source

Efficient practical method for differential protection of power transformer in the presence of the fault current limiters

IET Generation, Transmission & Distribution, 2023
The algorithms of the present generation of practical differential relays are based on two methods. The first method is based on the ratio of the harmonic content of the differential current, and the second one is based on the length of the time interval
Ali Sahebi, Hossein Askarian‐Abyaneh, Seyed Hossein Hesamedin Sadeghi, Haidar Samet, Om Parkash Malik   +4 more
doaj   +1 more source

Primary Current Test Method for Transformer Protection Based on Transient Load

Zhongguo dianli, 2021
When test load is insufficient, the current transformer (TA) secondary circuit test by primary current cannot be completed, which often results in the failure of new transformer protection to be put into normal operation.
Jiyin SHI
doaj   +1 more source

Evaluation of Filtered Spark Gap on the Lightning Protection of Distribution Transformers: Experimental and Simulation Study

Energies, 2020
Protection of transformers, as one of the most expensive equipment in the power system, against lightning overvoltage impulses is a vital task. This paper, for the first time so far, investigates the effects of a filtered spark gap on the protection ...
Mahdi Pourakbari-Kasmaei, Farhan Mahmood, Michal Krbal, Ludek Pelikan, Jaroslava Orságová, Petr Toman, Matti Lehtonen   +6 more
doaj   +1 more source

Impact of large-scale photovoltaic-energy storage power generation system access on differential protection of main transformer under symmetrical faults

Frontiers in Energy Research, 2023
The low voltage ride-through (LVRT) requirements demand large-scale photovoltaic (PV) power generation system remain connected to the grid during faults. It results in considerable impact on the characteristics of fault current.
Guosheng Yang, Jiaqi Zhang, Hao Zhang, Congbo Wang, Yujia Zhu, Xiaolong Chen   +5 more
doaj   +1 more source

New Hybrid Machine Learning Method for Detecting Faults in Three-Phase Power Transformers

Energies, 2022
A novel hybrid machine learning technique is proposed for the protection of three-phase power transformers in this study. Here, the developed model was tested across several types of current signal fault cases from different fault conditions and examined
Othman Abdusalam, Alasmer Ibrahim, Fatih Anayi, Michael Packianather   +3 more
doaj   +1 more source

Design and operation of a protection system for transformers with superconducting windings [PDF]

, 1985
Power transformers with superconducting windings need a protection system to prevent damage to the low-loss superconducting winding by an abnormally high current.
Klundert, L.J.M. van de, Oordt, K., Overbeeke, F. van   +2 more
core   +3 more sources

Transformer Monitoring and Protection in Dynamic Power Systems – A Review

Frontiers in Energy Research, 2020
Increasing distributed energy resources, especially the renewable energy resources (RESs) are being installed across power systems these years. These RESs, including solar photovoltaic, wind turbines, etc., provide opportunities for operators to improve ...
Boqi Xie, Dongbo Zhao, Tianqi Hong
doaj   +1 more source