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Journal articles on the topic 'Power transformer and reactor'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Tian, M., Q. Li, and Q. Li. "A Controllable Reactor of Transformer Type." IEEE Transactions on Power Delivery 19, no. 4 (2004): 1718–26. http://dx.doi.org/10.1109/tpwrd.2004.832352.

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2

Krupski, Piotr, and Henryka Danuta Stryczewska. "GLIDARC reactor power supply with ignition improvement." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 4 (2019): 1274–84. http://dx.doi.org/10.1108/compel-12-2018-0540.

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Purpose The research purpose of this paper is to confirm that internal overvoltages in the push–pull power inverter can be used to improve the discharge ignition in the gliding arc discharge (GAD) plasma reactor. Design/methodology/approach Investigations are based on the acquisition of voltage changes that occur together with the development of the discharge column and the imaging the GAD with the use of a high-speed camera. Findings The power supply has the distinctive feature of not having the switching overvoltages completely extinguished, as it is in typical push–pull inverters. The overv

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3

Tokunaga, Norikazu, Kunio Isiyama, and Hisao Amano. "Power Supply for Microwave Oven Using Transformer Including Resonant-Reactor." IEEJ Transactions on Industry Applications 111, no. 8 (1991): 633–38. http://dx.doi.org/10.1541/ieejias.111.633.

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4

Wang, Ji Zhong, and Ji Hong Tong. "Reactor Effects on the AC Governor System Transformer Grid Side Harmonics." Applied Mechanics and Materials 672-674 (October 2014): 950–55. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.950.

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The paper makes the simulation and analysis to the power harmonic which is produced by the AC drive device of the hot strip mill in the background of the metallurgical industry. Aiming at the line-side effects of AC-AC frequency conversion and AC-DC-AC frequency conversion control system harmonic, the paper makes the MATLAB simulation and analysis in three circumstances, such as the load parameters, the inductance value changes of transformer primary side and secondary side, and adding reactor etc., and defines the functions and value ranges of the line reactor. The simulation results can prov

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5

Varetsky, Yuriy. "Overvoltages on power filters under energizing industrial power system transformer." Energy engineering and control systems 6, no. 2 (2020): 97–103. http://dx.doi.org/10.23939/jeecs2020.02.097.

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The practice of operating industrial power supply systems containing filter circuits has shown that filter tuning can have a significant impact on filter performance. On the basis of simulations of a real power supply system carried out by the Matlab / Simulink package, the results of a study of the impact of filter manufacturing tolerances on the filter transients under transformer energizing are presented. The most severe transients are observed for filter circuits in the power supply systems of electric arc furnaces due to frequently repeated operating energizing furnace transformers. This

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6

Kołek, Jacek, and Marcin Hołub. "Practical Design of a High-Voltage Pulsed Power Supply Implementing SiC Technology for Atmospheric Pressure Plasma Reactors." Applied Sciences 9, no. 7 (2019): 1451. http://dx.doi.org/10.3390/app9071451.

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Non-thermal plasma reactors offer numerous advantages and are used in a wide variety of applications. Exemplary fields of use include exhaust gas or water quality improvement, surface processing, agriculture, or medical processes. Two of the most popular discharge chamber constructions are dielectric barrier discharge (DBD) and pulsed corona discharge (PCD, barrierless) plasma reactors. Various power supply constructions are presented in the literature with varying complexity and operating principles. A simple, power electronic, pulsed power supply construction is presented in this work, imple

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7

Zhu, Wu, Xiang Cun Tu, and Chang Chun Qu. "The Review of Technology of Power Quality Disturbances Generator." Advanced Materials Research 383-390 (November 2011): 1441–46. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.1441.

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To test the Electric equipment’s immunity to voltage disturbances, a special power quality disturbances generator was needed. According to the principles of power quality disturbances generator, they were divided into the following types: the form of arbitrary waveform generator adds amplifier, the combination of transformers in series or parallel mode, regulating transformer tap position, thyristor controlled reactor, AC/DC/AC converter and the other traditional methods in this paper. This paper discusses the main technology characteristics of implementations in detail, describes different ki

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8

Klimash, V. S., and B. D. Tabarov. "Method for control of the start-up regulating devicefor power transformers of the power supply system." Power engineering: research, equipment, technology 21, no. 3 (2019): 135–45. http://dx.doi.org/10.30724/1998-9903-2019-21-3-135-145.

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Three-phase thyristor switches are designed for pulsed formation of inrush currents of electrical equipment with their subsequent shunting in steady state operation. In transformer substations, they perform a bumpless turning on of a power transformer by connecting its primary winding first to two phases of the network at the moment of zero crossing by the phase voltage of the network third phase, and then to the network third phase at the moment of zero crossing by the line voltage of the other two network phases. In this case, the starting currents of the transformer almost immediately enter

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9

Duc Minh, Ngo. "Effect of Transformer Parameters and Line Reactor on Power Flows in High-Voltage Systems." American Journal of Electrical Power and Energy Systems 8, no. 3 (2019): 77. http://dx.doi.org/10.11648/j.epes.20190803.12.

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10

Yao, Jianfu, Lu, Zhanqing, Zipan, and Rong. "Research on Access Mode of the Flexible DC Power Distribution System into AC System." Energies 12, no. 20 (2019): 4002. http://dx.doi.org/10.3390/en12204002.

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The connection mode of the direct current (DC) power distribution system and the alternating current (AC) system is the foundation of system design, and it is also one of key technologies of the DC power distribution network. Based on the topology structure, grounding method, main equipment parameters, load parameters and system control protection strategy of the DC power distribution system, this paper establishes the system simulation model in the case of configuring the connection transformer and not configuring the connection transformer. Simulation results show that, when no connecting tr

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11

Li, Yong, Yanjian Peng, Fang Liu, et al. "A Controllably Inductive Filtering Method With Transformer-Integrated Linear Reactor for Power Quality Improvement of Shipboard Power System." IEEE Transactions on Power Delivery 32, no. 4 (2017): 1817–27. http://dx.doi.org/10.1109/tpwrd.2016.2574316.

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12

Cui, Qi Ming, Shu Ting Cui, Zu Yuan Guan, and Wen Tao Sun. "Expert System Based on ESTA and Guide for Condition Evaluation of Transformers." Advanced Materials Research 347-353 (October 2011): 306–9. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.306.

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Through the application research of expert system shell ESTA, We have established a transformer condition evaluation expert system(ES) based on ESTA and corporate standards of State Grid (Q/GDW 169-2008) «Guide forCondition Evaluation of Oil-immersed Power Transformers (Reactors) ». Knowledge Base consists of several sections, parameters, rules in the evaluation of state variables, components and transformers. The value of the transformer condition evaluation expert system is that it supports and enhances the operation and maintenance personnel work, guidance (less experienced) the operation a

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13

Teranishi, Kenji, and Haruo Itoh. "Absolute Measurement of Surface Potential and Discharge Power Distributions for Piezoelectric Transformer-Based Plasma Reactor." Japanese Journal of Applied Physics 44, no. 9B (2005): 7083–88. http://dx.doi.org/10.1143/jjap.44.7083.

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14

Huang, Wen Tao, Meng Song, Nan Nan Hu, et al. "Design and Prototype Test of a High Leakage Reactance Transformer-Based HTS Controllable Reactor." Advanced Materials Research 960-961 (June 2014): 684–88. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.684.

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With the development of high voltage long distance transmission and expansion of the grid, continuous reactive power compensation devices, such as controllable reactor, become more and more important. This paper describes the design and prototype test of a high leakage reactance transformer-based high temperature superconducting controllable reactor (HLRT-HTSCR). Characteristics test results show the excellent impedance regulation characteristic of the prototype. DC critical current test of the superconducting winding shows that attention should be paid to the critical current of superconducti

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15

L’vov, S. Yu, V. B. Komarov, V. N. Bondareva, et al. "Contamination of the transformer oil of power transformers and shunting reactors by metal-containing colloidal particles." Power Technology and Engineering 45, no. 1 (2011): 76–81. http://dx.doi.org/10.1007/s10749-011-0227-3.

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16

Stryczewska, Henryka Danuta. "Supply Systems of Non-Thermal Plasma Reactors. Construction Review with Examples of Applications." Applied Sciences 10, no. 9 (2020): 3242. http://dx.doi.org/10.3390/app10093242.

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A review of the supply systems of non-thermal plasma reactors (NTPR) with dielectric barrier discharge (DBD), atmospheric pressure plasma jets (APPJ) and gliding arc discharge (GAD) was performed. This choice is due to the following reasons: these types of electrical discharges produce non-thermal plasma at atmospheric pressure, the reactor design is well developed and relatively simple, the potential area of application is large, especially in environmental protection processes and biotechnologies currently under development, theses reactors can be powered from similar sources using non-linea

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17

KIMSTACH, O., I. ILLIASHENKO, and A. ZHEZHELO. "MATHEMATICAL MODELING OF A THREE-PHASE TRANSFORMER TAKING INTO ACCOUNT A MAGNETIC CORE ASYMMETRY." HERALD OF KHMELNYTSKYI NATIONAL UNIVERSITY 295, no. 2 (2021): 165–71. http://dx.doi.org/10.31891/2307-5732-2021-295-2-165-171.

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The paper analyses the aspects of modelling the operation of a three-phase core-type transformer. The features of the magnetic system construction of the transformer, which generate asymmetry, are disclosed. The fundamentals and methods for modelling a transformer in dynamic modes are considered. The main purpose of the paper is to research the influence of taking into account the asymmetry of the transformer magnetic core on its dynamic model. The paper proposes the mathematical model of a three-phase planar core-type transformer, which takes into account the asymmetry of the magnetic core. T

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18

Suryavanshi, Hitesh, Jeyabalan Velandy, and Mithun Sakthivel. "Wavelet power ratio signature spectrum analysis for prediction of winding insulation defects in transformer and shunt reactor." IEEE Transactions on Dielectrics and Electrical Insulation 24, no. 4 (2017): 2649–59. http://dx.doi.org/10.1109/tdei.2017.006328.

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19

Xiao-Qiang, Chen, Hao Chun-Ling, Qiu Hao, and Li Min. "Thirty-six pulse rectifier scheme based on zigzag auto-connected transformer." Archives of Electrical Engineering 65, no. 1 (2016): 117–32. http://dx.doi.org/10.1515/aee-2016-0009.

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AbstractIn this paper, a low kilo-volt-ampere rating zigzag connected autotransformer based 36-pulse rectifier system supplying vector controlled induction motor drives (VCIMD) is designed, modeled and simulated. Detailed design procedure and magnetic rating calculation of the proposed autotransformer and interphase reactor is studied. Moreover, the design process of the autotransformer is modified to make it suitable for retrofit applications. Simulation results confirm that the proposed 36-pulse rectifier system is able to suppress less than 35thharmonics in the utility line current. The inf

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20

Huang, Yue Hua, Zhe Heng Zhou, Hong Tao Fan, and Jian Qi. "Research on an AC/DC Converter Based on the Convert Station in HVDC Light Technology." Advanced Materials Research 986-987 (July 2014): 1988–91. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1988.

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In this research, a converter, suitable for the convert station of the HVDC light technology, is proposed and optimized. The converter mainly consists of AC chopper, rectifier transformer, low-pass filters and smoothing reactor. This system can restrain the disturbance of the input power and output the power with high quality. This research is going to analyze the working principle of the converter and then optimize the output wave through filters. Circuit’s simulation is carried out by MATLAB to verify the reliability and feasibility of this converter topology.

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21

Han, Gu Jing, Jing Lei Deng, and Dong Xu. "Research on High Frequency and High Voltage Switching Power Supply for Electrostatic Precipitator." Applied Mechanics and Materials 241-244 (December 2012): 653–56. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.653.

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Electrostatic precipitator is the efficient dust removal equipment for environmental protection. As the core part, high voltage inverter power supply determines the efficiency and effect of dust removal. This paper design a high frequency and high voltage switching power supply for electrostatic precipitator based on FPGA. The power supply system is composed of rectifier and filter circuit, high frequency inverter circuit, step-up transformer and high voltage rectifier silicon reactor circuit. Using IRFP460N as power switches, single-phase full-bridge inverter was set up. The SPWM signals prod

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22

Sadeghkhani, Iman, Abbas Ketabi, and Rene Feuillet. "Investigation of Transmission Line Models for Switching Overvoltages Studies." International Journal of Emerging Electric Power Systems 14, no. 3 (2013): 231–38. http://dx.doi.org/10.1515/ijeeps-2012-0004.

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Abstract Overvoltages caused by switching operation of power system equipments might damage some equipment and delay power system restoration. This paper presents a comparison between transmission line (TL) models for overvoltages study and investigates which TL model is most proper for every case study. Both simulation time and accuracy factors of TL models are considered for selecting best TL model. Various cases of switching of transformer, shunt reactor, capacitor bank, and transmission line are investigated and simulation results for a partial of 39-bus New England test system, ‎show that

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23

Priya. K.R, Anu, and Sasilatha T. "Transformer Exchanging with Vacuum Electrical Switch." Indonesian Journal of Electrical Engineering and Computer Science 8, no. 3 (2017): 679. http://dx.doi.org/10.11591/ijeecs.v8.i3.pp679-680.

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<p>This paper presents investigation of conceivable transient overvoltage that can be produced amid vacuum electrical switch (VCB) operation at the association purpose of a photovoltaic power plant. Average exchanging occasion that is identified with VCB concerns stimulation and de-empowerment of emptied transformer. Nonetheless, at the common photovoltaic power plant the transformer is sustained by an inverter outfitted with LC (or LCL) channels that are important for constraint of music and swell in voltage and current. From the perspective of exchanging operations, the inductance and

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24

Shrivastav, Alok Kumar, Pradip Kumar Sadhu, Ankur Ganguly, and Nitai Pal. "A Novel Transient Current Limiter Based on Three-Phase Thyristor Bridge for Y-yg Transformers." International Journal of Power Electronics and Drive Systems (IJPEDS) 6, no. 4 (2015): 747. http://dx.doi.org/10.11591/ijpeds.v6.i4.pp747-758.

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The transformer in flux current may be a transient current that happens in electrical devices has been charged. This current depends on completely different parameters probably the voltage magnitude, the switching on angle the permanent flux, the core physical phemeon characteristics, the primary circuit resistance, etc. To beat the issues arising owing to transients, these are required to be suppressed.In this paper, an easy and economical techniquie is conferred to limit the transient current of the Y-yg transformers. One amongst the most benefit of this technique is it doesn’t would like an

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25

LARIN, Visily S. "Questions of transformer engineering at the Colloquium of the research Committee A2 of SIGRE in 2019." Elektrichestvo 11, no. 11 (2020): 60–66. http://dx.doi.org/10.24160/0013-5380-2020-11-60-66.

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The article addresses the work conducted by CIGRE Study Committee A2 «Power Transformers and Reactors» and reflects the key events that took place at the colloquium of this committee that was held in November 2019 in New Delhi (India). Based on generalization of the colloquium proceedings, the key lines in the development of transformer equipment around the world, innovative investigations, solutions, and pilot projects presented at the colloquium, as well as the most intensely discussed matters, are pointed out.

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26

Gomes, Mário Helder, and João Tomé Saraiva. "A market based active/reactive dispatch including transformer taps and reactor and capacitor banks using Simulated Annealing." Electric Power Systems Research 79, no. 6 (2009): 959–72. http://dx.doi.org/10.1016/j.epsr.2008.12.014.

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27

Sadeghkhani, Iman, Abbas Ketabi, and Rene Feuillet. "Artificial-Intelligence-Based Techniques to Evaluate Switching Overvoltages during Power System Restoration." Advances in Artificial Intelligence 2013 (January 2, 2013): 1–8. http://dx.doi.org/10.1155/2013/316985.

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This paper presents an approach to the study of switching overvoltages during power equipment energization. Switching action is one of the most important issues in the power system restoration schemes. This action may lead to overvoltages which can damage some equipment and delay power system restoration. In this work, switching overvoltages caused by power equipment energization are evaluated using artificial-neural-network- (ANN-) based approach. Both multilayer perceptron (MLP) trained with Levenberg-Marquardt (LM) algorithm and radial basis function (RBF) structure have been analyzed. In t

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28

Fursanov, M. I., and A. A. Zalotoy. "Improvement of the Method of Calculation of Steady-State Modes of Urban Electric Networks Taking into Account Consumer Energy Sources." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 62, no. 6 (2019): 514–27. http://dx.doi.org/10.21122/1029-7448-2019-62-6-514-527.

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The method of calculation of the steady-state mode of the open city distribution electric network with small generation sources is offered. It is shown that the city electric network consists of passive and active physical elements. Passive elements include power transformers and linear regulators, overhead and cable power lines, current-limiting reactors, etc. Active elements of networks are power sources (transformer inputs of low voltage of feeding substations and distributed small generation sources) and loads, mathematical models of which can be various. Power sources in urban distributio

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29

Cho, Kang-Cheol, Min-Ki Park, and Sung-Hun Lim. "Analysis of the DC Fault Current Limiting Characteristics of a DC Superconducting Fault Current Limiter Using a Transformer." Energies 13, no. 16 (2020): 4210. http://dx.doi.org/10.3390/en13164210.

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Recently, a lot of interesting research has been conducted to solve the fault current problem of the DC system. In long-distance transmission, DC transmission is more economical than AC transmission. The connection of power grids with a DC system can also better control the power flow and provide high stability. However, the control of the fault current in a DC system is more difficult to handle than in an AC system because the DC system does not make a zero point, unlike the AC system. In addition, there is a disadvantage, in that an arc occurs when a circuit breaker operates. In this paper,

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30

Bharti, Satyadharma, and Satya P. Dubey. "Controlled Shunt Reactor for UHVAC System Reactive Power Control." Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 13, no. 3 (2020): 417–25. http://dx.doi.org/10.2174/2352096512666190130095341.

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Background: In this paper, a novel technique for reactive power management of the Ultra High Voltage (UHV) lines having voltage level of 1200 kV line and above is suggested. The UHV power grid has to frequently face the problems associated with the power- frequency and switching over-voltages. Methods: The technique involves the use of three-phase UHV Transformers as a Controlled Shunt Reactor (CSR) in combination with the use of a fixed reactor. The performance of the UHV AC transmission line is studied using PSCAD software and working of CSR is evaluated. Results: Standard parameters of the

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31

Gao, Shuguo, Jun Zhao, Lingming Meng, and Hongliang Liu. "Prediction of the Progressive Loss of Winding Clamping Pressure in Power Transformers." Mathematical Problems in Engineering 2020 (February 18, 2020): 1–8. http://dx.doi.org/10.1155/2020/6315239.

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This paper investigates the progressive loss of winding clamping pressure resulted from thermal aging in power transformers. Firstly, out-of-plane stress-strain characteristics of aging pressboards are investigated experimentally and relationship between mechanical properties of pressboards and aging hours is established accordingly. Then, a thermal-mechanical model is built to correlate the aging time with temperature based on the first-order reaction kinetics. Based on the above investigations, the correlation between temperature and mechanical properties of pressboards is obtained and the p

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32

Wang, Qijun, Gai Wu, Sheng Liu, Zhiyin Gan, Bo Yang, and Junheng Pan. "Simulation-Based Development of a New Cylindrical-Cavity Microwave-Plasma Reactor for Diamond-Film Synthesis." Crystals 9, no. 6 (2019): 320. http://dx.doi.org/10.3390/cryst9060320.

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A 2.45 GHz microwave-plasma chemical-vapor deposition (MPCVD) reactor was designed and built in-house by collaborating with Guangdong TrueOne Semiconductor Technology Co., Ltd. A cylindrical cavity was designed as the deposition chamber and a circumferential coaxial-mode transformer located at the top of the cavity was adopted as the antenna. Two quartz-ring windows that were placed far away from the plasma and cooled by water-cooling cavity walls were used to affix the antenna to the cavity and act as a vacuum seal for the reactor, respectively. This design improved the sealing and protected

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33

Sadeghkhani, Iman, Abbas Ketabi, and Rene Feuillet. "The Study of Switching Overvoltages under Power System Restoration Scenario Using Extended Delta-Bar-Delta Algorithm." International Journal of Emerging Electric Power Systems 14, no. 3 (2013): 219–30. http://dx.doi.org/10.1515/ijeeps-2012-0003.

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Abstract This paper presents an intelligent approach to evaluate switching overvoltages during power equipment energization. Switching action is one of the most important issues in power system restoration schemes. This action may lead to overvoltages that can damage some equipment and delay ‎power system restoration. In this work, transient overvoltages caused by power equipment energization are analyzed and estimated using artificial neural network (ANN)-based approach. Three learning algorithms, delta-bar-delta (DBD), extended delta-bar-delta (EDBD), and directed random search (DRS), were u

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34

Yuan, Fang, Jiang Guo, Zhihuai Xiao, Bing Zeng, Wenqiang Zhu, and Sixu Huang. "A Transformer Fault Diagnosis Model Based on Chemical Reaction Optimization and Twin Support Vector Machine." Energies 12, no. 5 (2019): 960. http://dx.doi.org/10.3390/en12050960.

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The condition monitoring and fault diagnosis of power transformers plays a significant role in the safe, stable and reliable operation of the whole power system. Dissolved gas analysis (DGA) methods are widely used for fault diagnosis, however, their accuracy is limited by the selection of DGA features and the performance of fault diagnosis models, for example, the classical support vector machine (SVM), is easily affected by unbalanced training samples. This paper presents a transformer fault diagnosis model based on chemical reaction optimization and a twin support vector machine. Twin suppo

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35

KALINICHENKO, V., and I. PRIDATKO. "Some aspects of the calculation of short circuits in mine distribution networks. The calculation of the effective values of the short-circuit currents is carried out in order to determine the minimum." Journal of Electrical and power engineering 14, no. 1 (2020): 66–69. http://dx.doi.org/10.31474/2074-2630-2020-1-66-69.

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The calculation of the effective values of the short-circuit currents is carried out in order to determine the minimum value of the current of the two- phase short-circuit required to select the settings of the means of protection, as well as the maximum value of the current of the three-phase short-circuit required to test the switching equipment for the ability to switch off. In most studies, the calculation of short-circuit currents is carried out only taking into account the total resistance of the transformer substation and the cable network. They also take into account the maximum short-

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36

Wang, Fu Zhong, Peng Fei Dong, and Shu Min Shao. "On-Line Detection of the Coal Mine Power Cable Parameters Based on the Method of Low Frequency Signal." Applied Mechanics and Materials 574 (July 2014): 474–79. http://dx.doi.org/10.4028/www.scientific.net/amm.574.474.

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The coal mine power supply mainly rely on cable, its insulation level directly affects the coal mine safety production. Has long been lack of perfect insulation parameters online detesting equipment, the traditional detection methods need to stop the normal grid power supply, affect the normal production of coal mine, it is great significance that research a kind of on-line insulation parameters detection equipment. Using three-phase reactor in the neutral point insulation system to make artificial neutral point, from this point inject low-frequency voltage signal, the signal through the cable

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37

Yuan, Fang, Jiang Guo, Zhihuai Xiao, Bing Zeng, Wenqiang Zhu, and Sixu Huang. "An Interval Forecasting Model Based on Phase Space Reconstruction and Weighted Least Squares Support Vector Machine for Time Series of Dissolved Gas Content in Transformer Oil." Energies 13, no. 7 (2020): 1687. http://dx.doi.org/10.3390/en13071687.

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Transformer state forecasting and fault forecasting are important for the stable operation of power equipment and the normal operation of power systems. Forecasting of the dissolved gas content in oil is widely conducted for transformer faults, but its accuracy is affected by data scale and data characteristics. Based on phase space reconstruction (PSR) and weighted least squares support vector machine (WLSSVM), a forecasting model of time series of dissolved gas content in transformer oil is proposed in this paper. The phase spaces of time series of the dissolved gas content sequence are reco

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38

Li, Suya, Cong Zhao, Yanwei Dong, Songyuan Li, Nan Li, and Bowen Guo. "Talking about the significance of optimizing the condition evaluation standard of small power grid equipment such as voltage transformer." E3S Web of Conferences 185 (2020): 01049. http://dx.doi.org/10.1051/e3sconf/202018501049.

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Power grid equipment condition evaluation and condition maintenance is a kind of operation and maintenance means with strong reliability, low cost and high efficiency in power grid equipment operation management. At present, when carrying out state assessment of power grid equipment such as, grounding devices, capacitors, reactors, because of the features of large number, frequent failures, complex and changeable operating environment, etc, existing state evaluation standards have obvious deficiencies, which makes it difficult to meet management needs. Optimizing state evaluation standards, fo

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39

Park, Byungju, Jaehyeong Lee, Hangkyu Yoo, and Gilsoo Jang. "Harmonic Mitigation Using Passive Harmonic Filters: Case Study in a Steel Mill Power System." Energies 14, no. 8 (2021): 2278. http://dx.doi.org/10.3390/en14082278.

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In this study, we mitigated the harmonic voltage in a power system that contained the roughing mill (RM) and finishing mill (FM) motor drives. AC/DC converter type RM drive is a non-linear, large-capacity varying load that adversely affects power quality, e.g., a flicker, voltage distortion, etc. The voltage drop can be compensated within a certain limit by using the proper capacity of a power capacitor bank. In addition, the voltage distortion can be controlled as per the guidelines of IEEE Std. 519 using the passive harmonic filter corresponding to the characteristic harmonics of the motor d

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40

Tavalaei, Jalal, Zulkurnain Abdul-Malek, Amir Hesam Khavari, and A. R. Naderipour. "Nonlinear Resonance Suppression as Distorting and Saturating Source in Voltage and Current of Power Transformer: UPFC and STATCOM Performance Evaluation." Applied Mechanics and Materials 818 (January 2016): 79–85. http://dx.doi.org/10.4028/www.scientific.net/amm.818.79.

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Non linear resonance usually resonates in network which is consisting of ferromagneticcore. When distributed capacitance calculated form circuit breaker; mainly circuit breaker and cablecapacitance; after switching and opening the network feed apparatus, magnetization current on ferromagnetic core jump to saturation. Duration of ferroresonance is deeply relying on capacitance, and itwill be decaying by disembarking total store energy. Although, ferroresonance commence by switching circuit breaker off; protecting relay and other protecting schemes have no reaction, because thelast protection st

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Tajik, Reza, Hasan Asilian Mohabadi, Ali Khavanin, Ahmad Jonidi Jafari, and Babak Eshrati. "The Effect of Solvent, Hydrogen Peroxide and Dioxide Titanium on Degradation of PCBs, Using Microwave Radiation in Order to Reduce Occupational Exposure." Archives of Environmental Protection 40, no. 2 (2014): 91–102. http://dx.doi.org/10.2478/aep-2014-0018.

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Abstract Polychlorinated biphenyls (PCBs) are one group of persistent organic pollutants (POPs) that are of international concern because of global distribution, persistence, and toxicity. Removal of these compounds from the environment remains a very difficult challenge because the compounds are highly hydrophobic and have very low solubility in water. A 900 W domestic microwave oven, pyrex vessel reactor, pyrex tube connector and condensing system were used in this experiment. Radiation was discontinuous and ray powers were 540, 720 and 900 W. The PCBS were analyzed by GC-ECD. The applicatio

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Abdollahi, Rohollah. "Pulse doubling in zigzag–connected autotransformer–based 12–pulse ac–dc converter for power quality improvement." Journal of Electrical Engineering 63, no. 6 (2012): 357–64. http://dx.doi.org/10.2478/v10187-012-0053-3.

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This paper presents a pulse doubling technique in a 12-pulse ac-dc converter which supplies direct torque controlled motor drives (DTCIMDs) in order to have better power quality conditions at the point of common coupling. The proposed technique increases the number of rectification pulses without significant changes in the installations and yields in harmonic reduction in both ac and dc sides. The 12-pulse rectified output voltage is accomplished via two paralleled six-pulse acdc converters each of them consisting of three-phase diode bridge rectifiers. An autotransformer is designed to supply

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Jadim, Ramsey, Mirka Kans, Mohammed Alhattab, and May Alhendi. "A Novel Condition Monitoring Procedure for Early Detection of Copper Corrosion Problems in Oil-Filled Electrical Transformers." Energies 14, no. 14 (2021): 4266. http://dx.doi.org/10.3390/en14144266.

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The negative impacts of catastrophic fire and explosion accidents due to copper corrosion problems of oil-filled electrical transformers are still in the spotlight due to a lack of effective methods for early fault detection. To address this gap, a condition monitoring (CM) procedure that can detect such problems in the initial stage is proposed in this paper. The suggested CM procedure is based on identified measurable variables, which are the relevant by-products of the corrosion reaction, and utilizes an Early Fault Diagnosis (EFD) model to detect and solve the copper corrosion problems. Th

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Beniak, Ryszard, and Arkadiusz Gardecki. "Computationally efficient method of simulation of an electric drive impact on the power grid." Archives of Electrical Engineering 62, no. 1 (2013): 77–90. http://dx.doi.org/10.2478/aee-2013-0006.

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Abstract This paper presents a computationally efficient method for modelling an impact of the converter drive on the power grid. The formalized variable structure method (FVSM) allows for comprehensive studies of the effect on the power grid and examining the relation between this effect and the number of drive and feeding line parameters. In order to obtain a comprehensive model along with the model of the power grid, the parameters that are applied originate from a drive of a coal-fired power station. These parameters have been determined based on assessment and estimation. The estimation p

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Krupski, Piotr, and Henryka Danuta Stryczewska. "A Gliding Arc Microreactor Power Supply System Based on Push–Pull Converter Topology." Applied Sciences 10, no. 11 (2020): 3989. http://dx.doi.org/10.3390/app10113989.

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The era of evolution in power electronic systems has led to a widespread displacement of power supplies operating at mains frequencies. Switched-mode power inverters offer possibilities incomparably higher than mains transformers. These trends have also entered into plasma technologies, including GlidArc plasma processing. The article presents the use of an inverter power supply for a miniaturized GlidArc. It is a demonstration of using a push–pull topology in an unusual application. A special part is devoted to parasitic phenomena in the inverter and the implementation of switching overvoltag

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Chen, Chuanmin, Yang Gao, and Songtao Liu. "Study on Noise Prediction Model and Control Schemes for Substation." Scientific World Journal 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/696429.

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With the government’s emphasis on environmental issues of power transmission and transformation project, noise pollution has become a prominent problem now. The noise from the working transformer, reactor, and other electrical equipment in the substation will bring negative effect to the ambient environment. This paper focuses on using acoustic software for the simulation and calculation method to control substation noise. According to the characteristics of the substation noise and the techniques of noise reduction, a substation’s acoustic field model was established with the SoundPLAN softwa

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Adeoye OS. "Power quality issues: Power supply interruptions as key constraint to development in Ekiti State, Nigeria." Global Journal of Engineering and Technology Advances 7, no. 3 (2021): 109–17. http://dx.doi.org/10.30574/gjeta.2021.7.3.0052.

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The power quality issues in the world today are critical to the development of different nations. Prosperity of each nation depends on availability of constant power supply and the quality of supply of power is very important to the required developments in world in the past, the present and the future. Constant power supply is a major challenge in Africa particularly in Nigeria where the generated power is less than thirty percent of the required power. The metrics of power quality are voltage sag, flickers, spikes, harmonics, notching, transients and interruptions. This paper reviewed power

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Machulec, B., S. Gil, and W. Bialik. "Similarity of Ferrosilicon Submerged Arc Furnaces With Different Geometrical Parameters." Archives of Metallurgy and Materials 62, no. 4 (2017): 2343–47. http://dx.doi.org/10.1515/amm-2017-0344.

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Abstract In order to determine reasons of unsatisfactory production output regarding one of the 12 MVA furnaces, a comparative analysis with a furnace of higher power that showed a markedly better production output was performed. For comparison of ferrosilicon furnaces with different geometrical parameters and transformer powers, the theory of physical similarity was applied. Geometrical, electrical and thermal parameters of the reaction zones are included in the comparative analysis. For furnaces with different geometrical parameters, it is important to ensure the same temperature conditions

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Getnet, Tsegaye Gashaw, Milton E. Kayama, Elidiane C. Rangel, and Nilson C. Cruz. "Thin Film Deposition by Atmospheric Pressure Dielectric Barrier Discharges Containing Eugenol: Discharge and Coating Characterizations." Polymers 12, no. 11 (2020): 2692. http://dx.doi.org/10.3390/polym12112692.

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Eugenol (4-Allyl-2-methoxyphenol) is the main constituent of clove oil. In addition to being widely used as a condiment, it has been recognized as a powerful bactericide. Owing to that, Eugenol has been used in several applications including odontology and as a conservative for food products. Aiming at the development of natural bactericide coatings, in this work, using an atmospheric pressure plasma in a dielectric barrier discharge (DBD) reactor Eugenol was deposited on stainless steel substrate, with argon as a carrier gas. The discharge power supply was a transformer at 14.4 kV peak-to-pea

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Garrido, Izaskun, Aitor J. Garrido, Jesús A. Romero, Edorta Carrascal, Goretti Sevillano-Berasategui, and Oscar Barambones. "Low EffortLiNuclear Fusion Plasma Control Using Model Predictive Control Laws." Mathematical Problems in Engineering 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/527420.

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One of the main problems of fusion energy is to achieve longer pulse duration by avoiding the premature reaction decay due to plasma instabilities. The control of the plasma inductance arises as an essential tool for the successful operation of tokamak fusion reactors in order to overcome stability issues as well as the new challenges specific to advanced scenarios operation. In this sense, given that advanced tokamaks will suffer from limited power available from noninductive current drive actuators, the transformer primary coil could assist in reducing the power requirements of the noninduct

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