scholarly journals Magneto-Thermo-Structural Analysis of Power Transformers under Inrush and Short Circuit Conditions

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3266
Author(s):  
Antonio Roniel Marques de Sousa ◽  
Marcus Vinicius Alves Nunes ◽  
Wellington da Silva Fonseca ◽  
Ramon Cristian Fernandes Araujo ◽  
Diorge de Souza Lima
Keyword(s):  
Structural Analysis ◽  
Electric Power ◽  
Short Circuit ◽  
Real Data ◽  
Short Circuit Current ◽  
Power Transformers ◽  
Inrush Current ◽  
Electric Power Supply ◽  
Axial Forces ◽  
Radial Forces

The main equipment responsible for connection and transmission of electric power from generating centers to consumers are power transformers. This type of equipment is subject to various types of faults that can affect its components, in some cases also compromising its operation and, consequently, the electric power supply. Thus, in this paper, electromagnetic, thermal, and structural analysis of power transformers was carried out with the objective of providing the operator with information on the ideal moment for performing predictive maintenance, avoiding unplanned shutdowns. For this, computational simulations were performed using the finite element method (FEM) and, from that, the different transformer operation ways, nominal currents, inrush current, and short-circuit current were analyzed. In this perspective, analyses of the effects that thermal expansion, axial forces, and radial forces exerted were carried out, contributing to possible defects in this type of equipment. As a study object, simulations were carried out on a 50 MVA single-phase transformer. It is important to emphasize that the simulations were validated with real data of measurements and with results presented in the current literature.

Analytical estimation of short circuit axial and radial forces on power transformers windings

2014 ◽  
Vol 8 (2) ◽  
pp. 250-260 ◽  
Author(s):  
Bashir Mahdi Ebrahimi ◽  
Saeed Saffari ◽  
Jawad Faiz ◽  
Alireza Fereidunian
Keyword(s):  
Short Circuit ◽  
Power Transformers ◽  
Analytical Estimation ◽  
Radial Forces

Magneto-Thermo-Structural Analysis of Power Transformers under Short Circuit Condition

2021 ◽  
Author(s):  
Antonio R. M. Sousa ◽  
Wellington Da S. Fonseca ◽  
Marcus V. A. Nunes ◽  
Ramon C. F. Araujo ◽  
Diorge de S. Lima
Keyword(s):  
Structural Analysis ◽  
Short Circuit ◽  
Power Transformers ◽  
Short Circuit Condition

scholarly journals Design and computational modeling of fault current limiter topologies

2020 ◽  
Author(s):  
Alexandre Bitencourt ◽  
Daniel H. N. Dias ◽  
Bruno W. França ◽  
Felipe Sass ◽  
Guilherme G. Sotelo
Keyword(s):  
Electric Power ◽  
Distributed Generation ◽  
Distribution System ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Economic Feasibility ◽  
Fault Current ◽  
Fault Current Limiter ◽  
Fault Current Limiters ◽  
Current Limiter

The increase in demand for electric power and the insertion of a distributed generation led to the rise of the short-circuit current in substations. Most of these Brazilian substations were designed decades ago, because of that their equipment may not support the new short-circuit current levels. To protect the installed equipment and avoid excessive costs replacing old devices, it is possible to install Fault Current Limiters (FCLs). This document is a report from an R&D project that evaluated FCL topologies considering real parameters in simulation from used equipment, concluding that the selected FCL topologies accomplished their technical objective. However, before implementing these topologies in the distribution system, one should consider the technical and economic feasibility of using semiconductor switching devices.

scholarly journals Противодействующий фотовольтаический эффект в верхней межгенераторной части трехпереходных GaInP/GaAs/Ge солнечных элементов

2019 ◽  
Vol 53 (11) ◽  
pp. 1568
Author(s):  
М.А. Минтаиров ◽  
В.В. Евстропов ◽  
С.А. Минтаиров ◽  
М.З. Шварц ◽  
Н.А. Калюжный
Keyword(s):  
Electric Power ◽  
Open Circuit Voltage ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Undesirable Effect ◽  
Current Dependence ◽  
Power Generators ◽  
Current Voltage ◽  
Current Voltage Characteristics

AbstractThe “top” intergenerator part situated between the GaInP and GaAs subcells (electric power generators) is analyzed. The shape of the light current–voltage characteristics and the V _ oc – J _ sc (open-circuit voltage–short-circuit current) dependence are examined. It is found that the p ^+– n ^+ tunnel heterojunction situated in the “top” intergenerator part can operate as a photoelectric source counteracting the base p – n junctions. In this case, the V _ oc – J _ sc characteristic has a descending part, and a sharp jump can be observed. This undesirable effect becomes weaker with increasing peak current of the tunnel junction.

Review of Short Circuit Current Prediction Technology in Electric Power System

2021 ◽  
pp. 311-327
Author(s):  
Xiren Miao ◽  
Shengbin Zhuang ◽  
Jiamin Li ◽  
Lingling Tang
Keyword(s):  
Power System ◽  
Electric Power ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Electric Power System

scholarly journals Analysis of Characteristics Over Current Relay and Ground Fault Relay on Feeder Rayon Tabing

2018 ◽  
Vol 248 ◽  
pp. 02006
Author(s):  
Arzul ◽  
Ija Darmana ◽  
Erliwati ◽  
Adiv Rama Salvayer ◽  
Tris Safri Yetno
Keyword(s):  
Electric Power ◽  
Power Distribution ◽  
Short Circuit ◽  
Relay Protection ◽  
Short Circuit Current ◽  
Phase 2 ◽  
Current Analysis ◽  
Protection Relay ◽  
Ground Fault ◽  
Overcurrent Relays

The reliability of power distribution of PT PLN (Persero) branch of Padang especially in Rayon Tabing most of the repeaters is still not optimal. This is due to an uncoordinated protection relay on each feeder. One effort made to improve the reliability of electric power is to rearrange the protection of overcurrent relays and ground disturbance relays on the feeder. So coordinated with each other well and is expected if there is interference in one of the repeater will not bring black out on other repeater. In this research we analyzed short circuit current at 20 kV side. From the analysis results obtained new relay protection settings based on the calculation of short-circuit current settings and compare the results with existing protection relays. By making efforts to improve the reliability of electric power is to rearrange the protection relay on each feeder. Based on short circuit current analysis on each repeater, the largest short circuit in 3 phase, 2 phase, and 1 phase disturbance is located at 1% disturbance location and the smallest disturbance is at 100% disturbance location. It can be concluded that the farther the location of the disturbance that occurs the smaller the disturbance, and vice versa, if the location of the disturbance that occurs closer then the greater the noise flow.

Characteristics of Global Solar Radiation Monitor Utilizing Solar Cells

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
A. Ibrahim ◽  
M. R. I. Ramadan
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Solar Radiation ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Global Solar Radiation ◽  
Short Circuit Current Density ◽  
Electric Power Supply ◽  
Radiation Monitor ◽  
Complete Test

This brief note examines the characteristics of solar cells from the standpoint of developing a global solar radiation monitor. The study is performed using a simplified photovoltaic test monitor manufactured, a single crystal p-type czochraliski (CZ) silicon solar cell of the construction n+pp++ passivated emitter solar cell coupled to a fluke 73 digital multimeter. The short circuit current density (Jsc) is examined during a complete test day from 8:40 AM to 7:40 PM. Subsequently, the test monitor is used for checking the accuracy of transfer operations of solar radiation. The results obtained by the test monitor utilizing solar cells are good due to: (a) it is simple in construction, (b) it exhibits a good response to all solar radiation variations, and (c) it works without an electric power supply.

scholarly journals Separation of Transformers for Class 1E Systems in Nuclear Power Plants

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Sang-Hyun Lee ◽  
Choong-Koo Chang
Keyword(s):  
Power System ◽  
Electric Power ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Voltage Drop ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Electric Power System ◽  
Improved Model

In order to supply electric power to the safety related loads, safety and reliability of onsite power have to be ensured for the safety function performance in nuclear power plants. Even though the existing electric power system of APR1400 meets the requirements of codes regarding Class 1E system, there is a room for improvement in the design margin against the voltage drop and short circuit current. This paper discusses the amount that the voltage drop and short circuit current occur in the existing electric power system of APR1400. Additionally, this paper studies with regard to the improved model that has the extra margin against the high voltage drop and short circuit current by separation of unit auxiliary transformer (UAT) and standby auxiliary transformer (SAT) for the Class 1E loads. The improved model of the electric power system by separation of UAT and SAT has been suggested through this paper. Additionally, effects of reliability and cost caused by the electric power system modification are considered.

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