Research Article
Study of Short-circuit Faults Affecting Electrical Networks
Noma Talibi Soumaïla*,
Abdou Hamidine Mamane Nassirou,
Attoumane Kosso Mamadou Moustapha,
Insa Issoufou Moussa,
Boureima Seibou
Issue:
Volume 14, Issue 6, December 2025
Pages:
142-150
Received:
24 November 2025
Accepted:
5 December 2025
Published:
30 December 2025
DOI:
10.11648/j.ijepe.20251406.11
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Abstract: Most faults in power lines are caused by short circuits resulting from phenomena such as lightning, severe weather, or power surges linked to circuit breaker operations. These short circuits, whether temporary or permanent, require accurate detection and location to enable rapid repair and restoration of power supply. To protect the system against short-circuit currents, which can cause irreversible damage to key equipment, it is essential to quickly disconnect the faulty part of the network. In order to correctly size this equipment, it is essential to estimate the magnitude of the currents likely to flow during a short circuit. This study involved calculating single-phase short-circuit currents in the event of a fault on the Cable, Soluxe, Airoport, Talladje, and Gawaye feeders at the Niamey3 electrical substation. The method used to calculate short-circuit currents in HTB and HTA networks is based on the principle of symmetrical components. This method was chosen for its accuracy and analytical nature. The results obtained show that the Soluxe feeder has the highest short-circuit current, with a value of 1.95 kA, compared to those of the Cable, Airoport, Talladje, and Gawaye feeders, which are 1.86 kA, 0.67 kA, 0.64 kA, and 0.56 kA, respectively. This is explained by the fact that the calculated impedances (direct, inverse, and zero-sequence) of this feeder are lower than those of the other four feeders.
Abstract: Most faults in power lines are caused by short circuits resulting from phenomena such as lightning, severe weather, or power surges linked to circuit breaker operations. These short circuits, whether temporary or permanent, require accurate detection and location to enable rapid repair and restoration of power supply. To protect the system against...
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Research Article
Fusion by Magnetic Reconnection Inquiry
Oleg Agamalov*
Issue:
Volume 14, Issue 6, December 2025
Pages:
151-158
Received:
6 November 2025
Accepted:
17 November 2025
Published:
31 December 2025
DOI:
10.11648/j.ijepe.20251406.12
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Abstract: The idea is to create a magnetic field configuration that can be repeatedly "stressed" and then triggered to reconnect at specific locations. This "directed multiple magnetic reconnection" (DMMR) would act like a series of precisely controlled explosions, dumping immense energy into the fuel ions and bringing them to fusion temperatures. This process would naturally operate in a duty cycle. Energy would be injected to "wind up" the magnetic field, which is then released in a powerful pulse through reconnections. This cycle of charging and discharging would be repeated, leading to a pulsed fusion energy output, much like an internal combustion engine. This contrasts with the continuous operation sought by most mainstream designs like tokamaks and stellarators. The foundation of this idea lies in the intricate interplay between three key concepts: turbulent pumping, stochastic resonance, directed multiple magnetic reconnections, and fusion, which are considered in this work.
Abstract: The idea is to create a magnetic field configuration that can be repeatedly "stressed" and then triggered to reconnect at specific locations. This "directed multiple magnetic reconnection" (DMMR) would act like a series of precisely controlled explosions, dumping immense energy into the fuel ions and bringing them to fusion temperatures. This proce...
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Research Article
Numerical Simulation Using Comsol Multiphysics of Temperature Profiles in Solar Cooker
Issue:
Volume 14, Issue 6, December 2025
Pages:
159-167
Received:
21 November 2025
Accepted:
15 December 2025
Published:
31 December 2025
DOI:
10.11648/j.ijepe.20251406.13
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Abstract: Solar thermal energy is available in abundance in a country like Senegal where direct solar radiation is on average 1950kWh/m2 per year. Solar thermal treatment is one of the methods to preserve food. Thermal treatment of agricultural products using solar thermal energy utilizes collectors to capture solar irradiation and convert its energy into heat, which is then used for drying, heating, cooking, or cooling the products. This study focuses on thermal treatment using a solar cooker. The work involves performing a numerical simulation of a solar cooker using COMSOL Multiphysics software to analyze the temporal and spatial distribution of physical parameters such as temperature, air velocity, and absolute pressure within the cooker. A theoretical model is made in order to establish the heat balance at the level of the cooker components. A model of the cooker was developed within the software after establishing assumptions and defining boundary conditions. The simulation results show that in the solar cooker, the absorber temperature can reach 123°C, allowing the cooking of many types of food. The isothermal profile reveals a dome-shaped structure evolving from the absorber, where the temperature is highest, towards the glass cover. The pressure is also uniform within the cooker. The pressure is approximately equal to 1.11 104Pa. Similarly, the air velocity inside the cooker is low.
Abstract: Solar thermal energy is available in abundance in a country like Senegal where direct solar radiation is on average 1950kWh/m2 per year. Solar thermal treatment is one of the methods to preserve food. Thermal treatment of agricultural products using solar thermal energy utilizes collectors to capture solar irradiation and convert its energy into he...
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