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Zeitschriftenartikel zum Thema „Electric transformers“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 30. Juli 2024

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1

Oktavianus Rikardus Waro and Aris Heriandriawan. "Analisis Umur Pakai Transformator Distribusi 800 Dan 1600 kVA Di PDAM Ngagel Surabaya." Venus: Jurnal Publikasi Rumpun Ilmu Teknik 2, no. 2 (March 9, 2024): 01–17. http://dx.doi.org/10.61132/venus.v2i2.234.

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Distribution transformers have a very important role in the electric power system. The lifespan of transformers in electric power systems will decrease over time. The reduced service life of distribution transformers is caused by several factors, including loading, ambient temperature, transformer winding temperature and transformer oil temperature. The author uses quantitative and qualitative research types. This research was conducted to determine the remaining useful life of distribution transformers. The data used in this research are transformer template data and peak load data during the

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ÖZÜPAK, Yıldırım. "Medium Frequency Electric Field Analysis of Power Transformers in High Voltage System." BEN Vol:2 Issue:3 2021 2, no. 3 (February 8, 2021): 1–5. http://dx.doi.org/10.36937/ben.2021.003.001.

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Electronic power transformers (EPT) are transformers that are smaller in size and volume compared to conventional 50 Hz frequency transformers. Medium frequency transformers (MFT) have begun to become important components in high voltage and high power energy conversion systems such as EPTs. In this study, the electric field distribution of these transformers is discussed. The electric field distributions in the transformer have been obtained using the two-dimensional finite element method (FEM). Besides, maximum electric field intensities were obtained in the study. ANSYS@Maxwell simulation p

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Savchenko, Oleg Vladislavovich, Mihail Yur'evich Khmel, Valery Nikolaevich Polovinkin, and Igor Mihaylovich Kalinin. "Ship electric propulsion systems transformers: specific aspects of development." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2024, no. 1 (February 29, 2024): 112–20. http://dx.doi.org/10.24143/2073-1574-2024-1-112-120.

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The necessity of new organizational and technical solutions in shipbuilding to ensure the quality of marine transformer transformers is substantiated. The analysis of the requirements of the Russian Maritime Register of Shipping, the current ISS for dry transformers is carried out, the experience of enterprises of related industries and foreign companies, the design features of power transformers of the ship's electric propulsion system are considered. The results of the analysis of the requirements for power transformers of marine electric propulsion systems, the features of their design and

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Xia, Lingyu, Xixiu Wu, Hui Hou, Shipu Wu, Yunbing Peng, and Jiaxin Cao. "Study on the error characteristics of transformer for primary and secondary fusion used in pole-mounted switchgear." Journal of Physics: Conference Series 2757, no. 1 (May 1, 2024): 012014. http://dx.doi.org/10.1088/1742-6596/2757/1/012014.

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Abstract The fusion of primary and secondary functions refers to integrating the function of primary equipment and secondary equipment together. If doing so, the working condition of the equipment for primary and secondary fusion becomes more and more complex and bad, especially the transformer working in the smaller workspace after fusing. Therefore, this paper focuses on the transformer used in primary and secondary fusion pole-mounted Switchgear and establishes the temperature field and electric field simulation model of the primary and secondary fusion pole-mounted switchgear transformer,

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Yusupov, D. T., I. K. Ismoilov, A. E. Norboev, R. X. Beytullaeva, and A. A. Yuldashev. "Development of a simulation model for assessing the technical condition of oil power transformers by measuring vibroacoustic parameters." E3S Web of Conferences 510 (2024): 04014. http://dx.doi.org/10.1051/e3sconf/202451004014.

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In the electric power industry, oil-type power transformers are considered the main device that ensures reliable transmission of electric power, and their technical capabilities are analyzed. Factors affecting long-term reliable operation of oil-fired power transformers are investigated. In this paper, a simulation model is developed to assess the condition of oil power transformers during rapid diagnosis. A mathematical model has also been developed that allows calculating the absorption coefficients and the general technical condition of oil power transformers depending on the value of the i

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Ilyas, Iriandi, and Muhamad Taufan Agassy. "ANALISIS KEGAGALAN CURRENT TRANSFORMER (CT) TIPE DUA BELITAN SEKUNDER DENGAN INTI MAGNETIK TERPISAH PADA SISTEM PROTEKSI DAN PEMBATAS DAYA." SAINSTECH: JURNAL PENELITIAN DAN PENGKAJIAN SAINS DAN TEKNOLOGI 32, no. 1 (March 29, 2022): 41–48. http://dx.doi.org/10.37277/stch.v32i1.1240.

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ABSTRACT Current transformers function to transform large currents into small currents used for electrical energy measurement instruments, power limitation and protection of electric power networks, current transformers have many types, the use of current transformers in actual facts such as electrical power requested by consumers to producers of electricity providers at 53 kVA to 197 kVA using a single ratio current transformer type and> 197 kVA using a secondary twisting transformer type with a separate magnetic core In this type of current transformers with different ratios have di

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Alyunov, A. N., O. S. Vyatkina, I. G. Akhmetova, R. D. Pentiuc, and K. E. Sakipov. "Issues on optimization of operating modes of power transformers." E3S Web of Conferences 124 (2019): 02015. http://dx.doi.org/10.1051/e3sconf/201912402015.

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The article presents measure to optimize the operating modes of power transformers in order to minimize losses of electrical energy. The influence of actual voltage and service life of power transformers on electric power losses is shown. It was proposed to determine the economic capacity of power transformers taking into account the indicated factors, as well as taking into account the time of transformer switching on into the electric network and the form of the load schedule.

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Jin, Lan, Dowon Kim, Ahmed Abu-Siada, and Shantanu Kumar. "Oil-Immersed Power Transformer Condition Monitoring Methodologies: A Review." Energies 15, no. 9 (May 6, 2022): 3379. http://dx.doi.org/10.3390/en15093379.

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A power transformer is one of the most critical and expensive assets in electric power systems. Failure of a power transformer would not only result in a downtime to the entire transmission and distribution networks but may also cause personnel and environmental hazards due to oil leak and fire. Hence, to enhance a transformer’s reliability and extend its lifespan, a cost-effective and reliable condition monitoring technique should be adopted from day one of its installation. This will help detect incipient faults, extend a transformer’s operational life, and avoid potential consequences. With

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Novais, I. F., A. A. P. Junior, and S. F. P. Silva. "Modeling Three-Phase Transformers." Energies and Quality Journal 1 (June 2019): 60–65. http://dx.doi.org/10.24084/eqj19.233.

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Transformers in electric power systems are of great importance, with significant effects on the distribution of electric energy. The modeling of this machine, considering the various usable connections, requires a more detailed analysis for better results. Thus, the objective of this work is to propose a three-phase transformer model including the neutral in the admittance matrices, the ground impedance, taps settings and also the magnetizing branch. Key words Three-phase transformers modeling, ground impedance, magnetizing branch, admittance matrix

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Jain, Akansha, and Masoud Karimi-Ghartemani. "Mitigating Adverse Impacts of Increased Electric Vehicle Charging on Distribution Transformers." Energies 15, no. 23 (November 29, 2022): 9023. http://dx.doi.org/10.3390/en15239023.

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As the world is transitioning to electric vehicles (EVs), the existing power grids are facing several challenges. In particular, the additional charging power demand may repeatedly overload the traditionally-sized distribution transformers and adversely impact their operational life. To address this challenge, this paper proposes an EV-based reactive power compensation strategy for transformer overloading mitigation. Specifically, a low-bandwidth centralized recursive controller is proposed to determine a set point for the EV’s onboard charger’s reactive power. Importantly, the proposed strate

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DeCristofaro, Nicholas. "Links of Science & Technology." MRS Bulletin 23, no. 5 (May 1998): 50–56. http://dx.doi.org/10.1557/s0883769400030451.

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On April 13, 1982, the Duke Power Company energized an experimental pad-mount distribution transformer in Hickory, North Carolina. The transformer, manufactured by General Electric, provided electric power to a local residence. That same month, the Georgia Power Company installed a similar transformer, made by Westinghouse Electric, atop a utility pole in Athens, Georgia. It supplied electricity for the exterior lights at the Westinghouse Newton Bridge Road plant. These devices shown in Figure 1 were unique among the nearly 40 million distribution transformers in service in the United States b

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Su, Biao, Li Xue Li, Yi Hui Zheng, Xin Wang, Yan Liu, and Chang Li Dang. "Design and Analysis of PCB Rogowski Coil Current Transformer." Applied Mechanics and Materials 672-674 (October 2014): 984–88. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.984.

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Electronic current transformers are more suitable for the development of power system compared with traditional electromagnetic current transformers. Rogowski coil current transformer is one of three electric current transformers. According to the measurement principle of Rogowski coils, the equivalent circuit of PCB Rogowski coils is analyzed. By using four PCB Rogowski coils combined, a PCB Rogowski coil current transformer is designed and tested. The results show that the designed PCB Rogowski coil transformer has good linearity and high sensitivity and measurement accuracy and it can meet

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Hanus, Oleksii, and Kostiantyn Starkov. "STUDY OF THE NATURE OF OVERVOLTAGES IN THE ELECTRICAL NETWORK ARISING FROM VOLTAGE TRANSFORMERS." Bulletin of the National Technical University "KhPI". Series: Energy: Reliability and Energy Efficiency, no. 1 (2) (July 2, 2021): 28–36. http://dx.doi.org/10.20998/2224-0349.2021.01.05.

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A non-linear dynamic mathematical model of voltage transformer has been considered and overvoltages arising on the elements of voltage transformer equivalent circuit during transient processes have been investigated. The influence of voltage transformer secondary circuit capacitance on overvoltage multiplicity in the primary circuits and the duration of transients has been determined. The advantages of approximation of nonlinearity of voltage transformers by hyperbolic sine are used. Mathematical expressions determining the nature of changes in the forced and free components of the transient p

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Sharma, Asmita. "Solid State Transformer: An Overview of Application and Advantages." International Journal for Research in Applied Science and Engineering Technology 12, no. 7 (July 31, 2024): 335–37. http://dx.doi.org/10.22214/ijraset.2024.63557.

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Abstract: Solid-state transformer (SST), Electronic power transformer or Power electronic transformer (PET) contain the transformer inside the AC-TO-AC converters or DC-TO-DC converters. SST is type of electric power converter that replaces a conventational transformer used in electric power distribution.SST carries the full power and provides the electrical isolation. This paper gives the information of the solid state transformers advantages and applications

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Kuznetsov, Andrey Albertovich, Viktor Vasilyevich Kharlamov, and Mariya Andreevna Volchanina. "Increase of efficiency of insulation diagnostics for high-voltage bushing of three-phase transformers." Transport of the Urals, no. 3 (2022): 86–93. http://dx.doi.org/10.20291/1815-9400-2022-3-86-93.

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The paper considers technical means of methods for diagnostics of insulation of high-voltage bushing for power transformers. It also points out advantages and disadvantages of existing methods and proposes a new solution for contactless diagnostics on the basis of measurement of electric field parameters near the surface of bushing. For control of technical condition of power transformers bushing the authors have developed a scheme for placement of elements of portable diagnostics device. A defect in the insulator leads to redistribution of electric potentials on capacitive elements of the hig

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Melnikova, O. S., and V. S. Kuznetsov. "Method of calculating the electric strength of oil channels of the main insulation of power transformers." Vestnik IGEU, no. 5 (December 30, 2020): 48–55. http://dx.doi.org/10.17588/2072-2672.2020.5.048-055.

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The most damage-sensitive unit of power transformers is the main insulation of the oil barrier type. The breakdown of such insulation occurs as a result of the breakdown of the oil channel near the high voltage winding. In accordance with traditional methods of calculating the dielectric strength of insulation, the value of the breakdown strength is determined by empirical formulas depending on the selected width of the oil channel. The existing methods do not consider the influence of the oil channel volume, of the electric strength the statistical characteristics of the oil, the design featu

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Kulesz, Barbara. "RECTIFIER TRANSFORMERS IN ELECTRIC TRACTION SUBSTATIONS ‐ DIFFERENT DESIGNS." TRANSPORT 20, no. 2 (April 20, 2005): 66–72. http://dx.doi.org/10.3846/16484142.2005.9637998.

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Electric traction in Poland is supplied with dc voltage which is obtained from the power grid via traction substations equipped with transformers and rectifiers. The paper gives the results of the investigation of different designs of these transformer‐rectfier sets ‐ namely, 12‐ and 24‐pulse systems. The comparison of electrical quantities such as ripple content, harmonic content of supply current and output voltage and utilisation of transformer secondary windings is provided.

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Krasovskyi, Pavlo. "Dynamics of No-Load Losses in Power Transformers." Advanced Engineering Forum 25 (November 2017): 113–17. http://dx.doi.org/10.4028/www.scientific.net/aef.25.113.

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Developed and released recommendations to clarify the calculation of idle power losses in power transformers of distribution networks. It takes into account the dynamics of magnetic properties changes in transformer cores, depending on the operation term and conditions, and major overhaul of the transformers with the magnetic core unburdening. It will improve the accuracy of normative losses calculation in power transformers and determine the most accurate structure of losses in electric networks.

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Tian, Fenglan, Zhongzhao Jing, Huan Zhao, Enze Zhang, and Jiefeng Liu. "A Synthetic Condition Assessment Model for Power Transformers Using the Fuzzy Evidence Fusion Method." Energies 12, no. 5 (March 5, 2019): 857. http://dx.doi.org/10.3390/en12050857.

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Condition-based maintenance decision-making of transformers is essential to electric enterprises for avoiding financial losses. However, precise transformer condition assessment was tough to accomplish because of the negligence of the influence of bushing and accessories, the difficulty of fuzzy grade division, and the lack of reasonable fuzzy evidence fusion method. To solve these problems, a transformer assessing model was proposed in the paper. At first, an index assessing system, considering the main body, the bushing and the accessories components, was established on the basis of componen

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Son, Won-Jin, and Byoung Kuk Lee. "Design of Planar Transformers for LLC Converters in High Power Density On-Board Chargers for Electric Vehicles." Energies 16, no. 18 (September 21, 2023): 6757. http://dx.doi.org/10.3390/en16186757.

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This article presents a planar transformer design and optimization method for high power density on-board chargers (OBCs) utilized in electric vehicles (EVs). Owing to considerations of electrical safety, OBCs require an isolated converter, leading to a substantial increase in volume due to the inclusion of a transformer. To address this issue and achieve high power density, a planar transformer is used, and an optimized design method is proposed for pattern arrangement, width, and core shape. The feasibility of the design is verified through the development of a 3.3 kW OBC prototype. Conseque

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Disios, Konstantinos, Irodotos Mantas, Antonios Melanitis, Eleftherios Amoiralis, and Marina Tsili. "Electric Machine Design through Investigation of Thermal Performance by Installing Thermocouple Sensors." Materials Science Forum 856 (May 2016): 349–55. http://dx.doi.org/10.4028/www.scientific.net/msf.856.349.

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The aim of this paper is to explore new approaches of monitoring, diagnosis, condition evaluation, and possibility of extending the life of transformers. Research, emphasizing to experimental work, is conducted on a 1.5 KVA single-phase transformer to measure the internal temperature of the primary and secondary winding, using reliable instruments. Special consideration is given to the convenience in the acquisition and management of experimental data, so that the proposed monitoring system can be exploited for all kinds of thermal tests and various loading conditions. The transformer under st

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Kefalas, Themistoklis D., and Antonios Kladas. "Reduction of Power Grid Losses by Using Energy Efficient Distribution Transformers." Materials Science Forum 721 (June 2012): 269–74. http://dx.doi.org/10.4028/www.scientific.net/msf.721.269.

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The importance of distribution transformer no-load loss on the operation of modern electrical grids is often underestimated. Internationally, distribution transformer no-load loss constitutes nearly 25% of the transmission and distribution losses of electrical grids. The losses in European Union distribution transformers are estimated at about 33 TWh/year whereas, reactive power and harmonic losses add a further 5 TWh/year. In the Greek electrical grid the no-load losses of 140,000 distribution transformers are estimated at about 490 GWh/year. This paper has two goals the first one is to illus

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Nozdrenkov, V. S., I. M. Diahovchenko, M. V. Petrovskyi, and V. V. Volokhin. "Fuzzy model of compensation for aging factors of distribution transformers." Electrical Engineering and Power Engineering, no. 2 (June 27, 2024): 7–17. http://dx.doi.org/10.15588/1607-6761-2024-2-1.

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Purpose. This paper aims to evaluate the negative factors that affect the aging of power distribution transformers, develop a fuzzy control model for their compensation, and study the results of applying the proposed model to different modes of the electrical power network. Methodology. The mathematical method of fuzzy logic was used to implement the control system of the power grid operating modes. Findings. The article presents a structure based on fuzzy logic for compensating depreciation factors of distribution transformers. A tuning algorithm and measures were developed to optimize the tr

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Gilfanov, K. H., N. Tien, R. N. Gaynullin, and I. Hallyyev. "Energy efficient heat supply system for electric power facilities." E3S Web of Conferences 124 (2019): 01011. http://dx.doi.org/10.1051/e3sconf/201912401011.

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The aim of the work is to confirm the possibility of creating an energy-saving heat supply system for power facilities by using computer modelling, analysis of the potential use of heat losses of electromagnetic energy in magnetic circuits and windings of transformers of substations, as well as the development of schemes for heat recovery losses for heat supply of power facilities. Computer simulation of electromagnetic and thermophysical processes in the power oil-filled transformer is carried out. Energy losses in windings, hysteresis and eddy currents in the magnetic circuit, as well as tem

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Varga, Aleksandr A., and Galaktion V. Shvedov. "Estimating the Error of Calculating the Load Losses in 6—10 kV Distribution Electric Networks." Vestnik MEI, no. 5 (2021): 37–43. http://dx.doi.org/10.24160/1993-6982-2021-5-37-43.

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The aim of the study is to estimate the level of load losses for actual (nonuniform) loading of transformer substations in comparison with the load loss level under the conditions of their being uniformly loaded for a typical 6 kV urban distribution electric network. The extent to which such networks are equipped with automated information and measurement systems for fiscal electricity metering is extremely poor. Therefore, not only the load curves of the 6--10/0.4 kV substation transformers, but also their load factors are unknown in the majority of cases. Under these conditions, in calculati

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S, Kumaran. "Transformer Fault Condition Prognosis Using Vibration Signals Over Cloud Environment." International Scientific Journal of Engineering and Management 03, no. 04 (April 23, 2024): 1–9. http://dx.doi.org/10.55041/isjem01631.

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he Automatic Area Transformer Fault Message Indicator is an innovative system designed to detect and report faults in transformers. It utilizes potential and current transformers, precision rectifiers, and sensors to monitor high/low voltage, current, frequency, and transformer temperature. The data is processed by a microcontroller, displayed on an LCD, and transmitted to the electric utility station via GSM, enabling timely identification and communication of transformer issues for efficient maintenance and grid reliability. This system offers several key benefits. First, its use of advanced

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Saidane, A. "Electric Machinery and Transformers." Microelectronics Journal 32, no. 9 (September 2001): 787. http://dx.doi.org/10.1016/s0026-2692(01)00052-0.

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Naumov, I. V., D. N. Karamov, A. N. Tretyakov, M. A. Yakupova, and E. S. Fedorinovа. "Study of power transformer loading in rural power supply systems." Safety and Reliability of Power Industry 13, no. 4 (February 18, 2021): 282–89. http://dx.doi.org/10.24223/1999-5555-2020-13-4-282-289.

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The purpose of this study is to study the effect of loading power transformers (PT) in their continuous use on their energy efficiency on a real-life example of existing rural electric networks. It is noted that the vast majority of PT in rural areas have a very low load factor, which leads to an increase in specific losses of electric energy when this is transmitted to various consumers. It is planned to optimize the existing synchronized power supply systems in rural areas by creating new power supply projects in such a way as to integrate existing power sources and ensure the most efficient

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HS, Syafruddin, Ali Hanafia Rambe, and Agus Prabowo. "Impact Analysis of Public Electric Vehicle Charging Stations on Transformers and Distribution Networks." Journal of Mechanical, Civil and Industrial Engineering 4, no. 4 (October 25, 2023): 08–19. http://dx.doi.org/10.32996/jmcie.2023.4.4.2.

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Public Electric Vehicle Charging Stations (SPKLUs) are critical infrastructure in facilitating the increasingly popular use of electric vehicles. The increasing number of electric vehicles using SPKLU also has an impact on existing transformers and distribution networks. This research uses the Fluke 1748 tool to analyze the impact on transformers and distribution networks. The Fluke 1748 is a tool that can record and analyze electrical parameters such as voltage, current, power, and power factor with high precision. The method used in this analysis involves installing the Fluke 1748 device at

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Levin, Vladimir M., and Ammar A. Yahya. "Adaptive management of technical condition of power transformers." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 4 (August 1, 2020): 3862. http://dx.doi.org/10.11591/ijece.v10i4.pp3862-3868.

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Ensuring reliable operation of power transformers as part of electric power facilities is assigned to the maintenance and repair system, whose important components are diagnostics and monitoring of the technical condition. Monitoring allows you to answer the question of whether the transformer abnormalities and how to do they manifest, while diagnostics allow determining the nature, the severity of the problem, determine the cause and possible consequences. The article presents the results of the authors ' research on creating an algorithm for adaptive control of the technical condition of pow

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Malažinskas, Vilius, Renaldas Raišutis, Alfonsas Morkvėnas, Saulius Gudžius, Audrius Jonaitis, Jonas Vaičys, and Gediminas Daukšys. "EVALUATION OF THE INSULATION CONDITION OF HIGH-VOLTAGE TRANSFORMERS BY DETECTING PARTIAL DISCHARGES USING THE ELECTROMAGNETIC WAVE RADIATION METHOD." Materiali in tehnologije 55, no. 2 (April 15, 2021): 253–61. http://dx.doi.org/10.17222/mit.2020.175.

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High-voltage transformers are among the most important elements in an electric-power system. Each one of them is affected by various external factors: overvoltage, partial discharge (PD), overheating, vibrations, etc., which are created by a strong electric field, thermal effect, humidity, impurities, factory defects, dissolved water and gas in oil-type-transformer insulation. These and other factors, caused by the environment, reduce the life of a device. Thus, the evaluation of the device condition is one of the most important factors for a system-safety evaluation, which ensures a reliable

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Berg, Heinz-Peter, and Nicole Fritze. "Risk and Consequences of Transformer Explosions and Fires in Nuclear Power Plants / Ryzyko I Konsekwencje Wybuchów Transformatora I Pożarów W Elektrowniach Jądrowych." Journal of KONBiN 23, no. 1 (September 1, 2012): 5–16. http://dx.doi.org/10.2478/jok-2013-0034.

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Abstract The high failure frequency and the resultant reliability and safety implications in recent years of transformers, in particular at nuclear power plants (NPP), required an in-depth assessment. Fires of main transformers are considered as critical because of the large quantity of oil in contact with high voltage elements. Therefore, these phenomena have been investigated in more detail using the information from the OECD FIRE database for NPP. 12.8 % of all fires and, thus, the most frequent fire source in this database are transformer fires, mainly fires of high voltage oil-filled tran

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Abdikulova, Z. K., та E. O. Zhaparov. "СALCULATION AND CHOICE OF ELECTRIC CHART OF SUBSTATION OF THE КENTAU TRANSFORMER PLANT". BULLETIN Series of Physics & Mathematical Sciences 70, № 2 (30 червня 2020): 141–48. http://dx.doi.org/10.51889/2020-2.1728-7901.21.

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Electric supply system in enterprises must provide with electrical supply continuity and reliability as in normal and accidental regimes, quality electro energetic, production efficiency, so in connection with these in the article there have been analyzed work regimes of substations, studied electrical net scheme for Kentau Transformer Plant’s substation, calculated plant’s loads and short circuit currents and on the base of the calculated results curried out inspection for the chosen equipment. The number of connections, reliability of power supply and prospects for development are the determ

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Seheda, M. S., P. F. Gogolyuk, and Y. V. Blyznak. "High-frequency periodic processes in two-winding power transformers." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 6 (2021): 96–100. http://dx.doi.org/10.33271/nvngu/2021-6/096.

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Purpose. Mathematical modeling of high-frequency periodic processes in winding power transformers to improve the technology of their design and operation. Methodology. The methods of the formation of mathematical models for the research of high-frequency periodic processes in transformers and methods of solving systems of partial differential equations are applied. Findings. The mathematical model for the research of high-frequency periodic processes in two-winding transformers, with adequate considering of electromagnetic connections of windings and structural parameters of transformers, is c

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Lansberg, A. A., A. V. Vinogradov, and A. V. Vinogradova. "The structure of the park of power transformers with a higher voltage of 6-10 Kv on the example of the electric grid organization of the branch of pjsc «Rosseti center»-«Orelenergo», serving rural electric networks." Power engineering: research, equipment, technology 23, no. 5 (January 9, 2022): 34–45. http://dx.doi.org/10.30724/1998-9903-2021-23-5-34-45.

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THE PURPOSE. Evaluation of the power transformer fleet 6-10/0,23-0,4 kV on the example of a branch of PJSC «Rosseti Center»-«Orelenergo».METHODS. In the work, based on the database of the branch of PJSC «Rosseti Center»-«Orelenergo», an analysis was made of the fleet of power transformers with a higher voltage of 6-10 kV in terms of their number, circuits and groups of connection of windings, rated power, terms of service, as well as energy efficiency classes, taking into account the current standards of the technical organization of PJSC «Rosseti».RESULTS. According to the results of the stud

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Bolshanin, G. A., and E. G. Skulina. "USE OF TRANSFORMERS AS PAIRING DEVICES FOR MEASURING SYSTEMS." EurasianUnionScientists 1, no. 7(76) (August 20, 2020): 66–70. http://dx.doi.org/10.31618/esu.2413-9335.2020.1.76.895.

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The execution of devices of interface of means of control of indicators of quality of electric energy with the electric power system in the form of measuring transformers of voltage and shunt of alternating current is shown. This is most preferable due to the lack of non-linearity in the working area of magnetic characteristics. A transformer substitution scheme is shown, as well as experiment execution schemes, as a result of which the necessary parameters are determined.

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Alame, Dima, Maher Azzouz, and Narayan Kar. "Assessing and Mitigating Impacts of Electric Vehicle Harmonic Currents on Distribution Systems." Energies 13, no. 12 (June 23, 2020): 3257. http://dx.doi.org/10.3390/en13123257.

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Harmonic currents of electric vehicle (EV) chargers could jeopardize the power quality of distribution systems and add to the transformer’s losses, thus degrading its lifetime. This paper assesses and mitigates the impacts of different EV chargers on distribution transformers and the voltage quality of distribution systems. The effect of state-of-charge (SOC) of the EV battery is considered through applying weighted arithmetic mean to accurately assess the impacts of EV harmonic currents on aging and losses of the EV interfacing transformer. The voltage quality of the IEEE 33-bus distribution

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Carreno, Alvaro, Marcelo Perez, Carlos Baier, Alex Huang, Sanjay Rajendran, and Mariusz Malinowski. "Configurations, Power Topologies and Applications of Hybrid Distribution Transformers." Energies 14, no. 5 (February 24, 2021): 1215. http://dx.doi.org/10.3390/en14051215.

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Distribution systems are under constant stress due to their highly variable operating conditions, which jeopardize distribution transformers and lines, degrading the end-user service. Due to transformer regulation, variable loads can generate voltage profiles out of the acceptable bands recommended by grid codes, affecting the quality of service. At the same time, nonlinear loads, such as diode bridge rectifiers without power factor correction systems, generate nonlinear currents that affect the distribution transformer operation, reducing its lifetime. Variable loads can be commonly found at

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Ivanov, Georgi, Anelia Spasova, Valentin Mateev, and Iliana Marinova. "Applied Complex Diagnostics and Monitoring of Special Power Transformers." Energies 16, no. 5 (February 22, 2023): 2142. http://dx.doi.org/10.3390/en16052142.

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As a major component in electric power systems, power transformers are one of the most expensive and important pieces of electrical equipment. The trouble-free operation of power transformers is an important criterion for safety and stability in a power system. Technical diagnostics of electrical equipment are a mandatory part of preventing accidents and ensuring the continuity of the power supply. In this study, a complex diagnostic methodology was proposed and applied for special power transformers’ risk estimation. Twenty special power transformers were scored with the proposed risk estimat

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Dung, Nguyen Thi Ngoc. "Voltage Tap Changer of Power Transformer: Structure, Control and Application." International Journal of Research and Review 10, no. 12 (December 27, 2023): 343–51. http://dx.doi.org/10.52403/ijrr.20231237.

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This paper focuses on voltage tap changer of transformers to improve voltage quality in electric power systems. The structure and design of this unit will be mentioned with the capability to change the voltage ratio of the transformer in cases of having electric load at high voltage side and not having electric load at medium voltage side. A method to determine standard voltage taps for both high and medium voltage sides of three-winding transformers will be proposed in this paper to provide information for the controller and execute remote control. Moreover, the control structure of whole sys

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Melnikova, O. S. "Impact of distribution of impurity particles on electric strength of transformer oil." Vestnik IGEU, no. 6 (2019): 41–49. http://dx.doi.org/10.17588/2072-2672.2019.6.041-049.

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To extend the service life and ensure the operability of oil-filled transformer equipment, the attention is paid to the development of methods for monitoring the state of oil-barrier insulation. When monitoring the technical condition of transformer oil, the class of liquid purity is determined depending on the rated voltage of the equipment. However, the influence of the parameters of mechanical impurities on the breakdown voltage is not taken into account, thereby lowering the requirements for the quality of oil barrier insulation. This makes it relevant to study the influence of the size di

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Gracheva, E. I., A. N. Gorlov, and Z. M. Shakurova. "Calculation of the economy of electric energy in industrial electrical supply systems." Power engineering: research, equipment, technology 22, no. 2 (May 15, 2020): 65–74. http://dx.doi.org/10.30724/1998-9903-2020-22-2-65-74.

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The article examines the main features of the layout of electrical equipment for shop networks of internal power supply with the definition of indicators for a group of shop customers connected to a single power center, affecting the choice of the structure of schemes for shop network sites. The parameters characterizing the circuit topology are revealed. A study is presented of the influence of the load factor of workshop transformers on their reactive power factor, it is proved by calculation by technical and economic criteria the feasibility of replacing a workshop transformer with two with

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Vinogradov, A. V., A. V. Vinogradova, V. E. Bolshev, M. O. Ward, N. V. Makhiyanova, and L. V. Dolomaniuk. "Justification for creating a mobile complex to assess electric energy loss in power transformers during the operation process." E3S Web of Conferences 124 (2019): 02009. http://dx.doi.org/10.1051/e3sconf/201912402009.

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The paper analyzes the statistical data on the transformers of the Kromsky branch of Oreloblenergo OJSC including the average lifetime of the transformers and no-load losses measured in accordance with the requirements of Russian standard GOST 3484.1. The analysis indicates that the declared passport data differ from the measured data. There is also the analysis of technical solutions to improve the power transformer design including to development of new types of electrical steel used in transformer cores, superconducting materials for winding. The article gives an understanding of the advant

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Olosunde, Akinlolu, and Rowland Benjamin Ekpo. "HALF EXPONENTIAL POWER MODEL FOR THE FIRST TIME FAILURE OF POWER DISTRIBUTION TRANSFORMERS IN NIGERIA." Indonesian Journal of Statistics and Its Applications 4, no. 2 (July 31, 2020): 321–26. http://dx.doi.org/10.29244/ijsa.v4i2.640.

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Transformer failure is a major problem confronting the Nigerian power sector, hindering the transmission and distribution of electric power to various households, institutions, and industries. Many of these transformer developed problem due to the old age of the transformers, overloading, in-availability of technical expertise, poor maintenance culture, manufacturer's faults, just to mention few. The present research focuses on providing half exponential power model for the failure of already installed transformers, with respect to years of installation up to the time of the first failure, usi

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Lee, Choongman, Gyu-Jung Cho, and Joorak Kim. "Development of Scott Transformer Model in Electromagnetic Transients Programs for Real-Time Simulations." Applied Sciences 11, no. 12 (June 21, 2021): 5752. http://dx.doi.org/10.3390/app11125752.

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This paper presents a Scott transformer model to be applied in electromagnetic transients (EMT) programs, particularly in the absence of a detailed Scott transformer model for performing real-time simulations (RTS). Regarding a Scott transformer, a common topology for converting a three-phase network into two single-phase networks, the transformer model in EMT programs is essential to simulate large-scale electric railway systems. A code-based model has been developed to simulate the transformer in RTS directly and contain the transformer’s actual impedance characteristics. By establishing a m

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Hendri, Hendri, Yanuar Zulardiansyah Arief, and Abdul Syukur. "Testing of Palm Oil-Based Electric Power Transformer Insulation Oil as a Renewable Energy Source." Jurnal Pendidikan Teknologi Kejuruan 6, no. 1 (February 28, 2023): 56–63. http://dx.doi.org/10.24036/jptk.v6i1.32323.

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Reducing petroleum resources and environmental problems, alternative insulating oils with biodegradable characteristics have become an alternative. Esterification of palm-based oil is expected to provide better and optimum electrical properties. The esterification of palm oil will be carried out as a test sample and observed for its electrical, physical and chemical properties such as PD characteristics, breakdown voltage, dissipation factor, viscosity, flash point, etc. The effect of thermal aging on oil samples will also be carried out to simulate real situations in power transformer applica

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Bustamante, Sergio, Mario Manana, Alberto Arroyo, Pablo Castro, Alberto Laso, and Raquel Martinez. "Dissolved Gas Analysis Equipment for Online Monitoring of Transformer Oil: A Review." Sensors 19, no. 19 (September 20, 2019): 4057. http://dx.doi.org/10.3390/s19194057.

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Power transformers are the most important assets of electric power substations. The reliability in the operation of electric power transmission and distribution is due to the correct operation and maintenance of power transformers. The parameters that are most used to assess the health status of power transformers are dissolved gas analysis (DGA), oil quality analysis (OQA) and content of furfuraldehydes (FFA) in oil. The parameter that currently allows for simple online monitoring in an energized transformer is the DGA. Although most of the DGA continues to be done in the laboratory, the tren

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Gotovkina, Elena, Vladimir Tyutikov, Nikolay Smirnov, Vladimir Lebedev, and Evgeniy Bushuev. "Influence of insolation and ambient temperature on operation of digital voltage transformers in Russia." MATEC Web of Conferences 178 (2018): 09005. http://dx.doi.org/10.1051/matecconf/201817809005.

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The present study is devoted to questions connected with influence of solar radiation and high values of ambient air temperatures on work of digital voltage transformers. The developed designs of digital voltage transformers are included in smart grid system of technical and commercial metering of electric energy consumption. The analysis of the unfavorable conditions for work of digital voltage transformers for the conditions of Russia in summer is carried out. The results of mathematical simulation for thermal state of transformers, obtained with the help of COMSOL Multiphysics program based

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Rigot, Valentin, Tanguy Phulpin, Jihen Sakly, and Daniel Sadarnac. "A New 7 kW Air-Core Transformer at 1.5 MHz for Embedded Isolated DC/DC Application." Energies 15, no. 14 (July 19, 2022): 5211. http://dx.doi.org/10.3390/en15145211.

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This paper presents the study of air-core transformers for electric vehicles, developing them for medium-power (tens of kWs) converter applications specifically used at a high frequency. Air-core transformers have the advantage of lacking magnetic saturation and iron losses, making them suitable for high-frequency applications. We designed and manufactured a transformer for a determined frequency and inductance value. The design of this passive component aims to both keep the magnetic field inside the transformer and manage the thermal energy efficiently. The electrical, magnetic, and thermal

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Gapon, Dmytro, Oleg Gryb, Igor Karpaliuk, Andrey Zuev, and Tetiana Donetska. "Electric power metering with its low quality." Bulletin of the National Technical University "KhPI". Series: Energy: Reliability and Energy Efficiency, no. 2 (3) (December 30, 2021): 49–53. http://dx.doi.org/10.20998/2224-0349.2021.02.12.

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The issue of electricity metering with low quality is being considered. Special attention is paid to checking the connection metering scheme with low quality of electrical energy. It is shown that a specific circuit design can affect the accuracy of metering of electrical energy in case of poor quality of electrical energy. In distribution networks intended for power supply of industrial enterprises, reactive power is also active. If the consumer has compensating devices, the directions of active and reactive power can be opposite. It is noted that current transformers, selected taking into ac

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