MV/LV Overhead Transformer Monitoring and Hot Spot Temperature Estimation

Chaves, Tiago Rabelo; Martins, Marcos Aurélio Izumida; Pacheco, Bruno Alberto

doi:10.1109/ietc47856.2020.9249225

Cited by 5 publications

(9 citation statements)

References 6 publications

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“…First, a solution prototype was developed (Figure 4) with the production of 10 units to analyze the applicability of the transformer monitoring solution and the possible improvements to be applied in the following solutions. This development generated the study in [9], which presented the solution and results of the application. For the current measurement, Rogowski coils were used.…”

Section: Applied Technologiesmentioning

confidence: 99%

“…The formulas for performing this calculation are found in the IEC 60076-7-2018 standard [31]. According to [9,31], in the case of distribution transformers, which are installed in open environments subject to temperature fluctuations during the day and do not have a defined load profile, it is recommended to use the solution method of the differential equations. Annex I of the IEC 60076-7-2018 standard presents a calculation routine that must be carried out to estimate the hot-spot temperature and the loss of life of the transformer; this whole routine was implemented in the RTU to obtain these results of the monitored equipment.…”

Section: Hot-spot Temperaturementioning

confidence: 99%

“…One of those adverse situations is overload. The distribution grid has a level considered acceptable by the utility and the transformer, which allows the equipment to remain operating above its nominal power for a certain period of time [5,9]. If the overload reaches a level above what is allowed or if it lasts longer than expected, this will cause irreversible damage to the internal and essential components of the distribution transformer [1,[5][6][7]10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The overload in the distribution grid occurs because the end-user controls the load demand, making it uncontrollable solely by the utility [1,9]. The overload also causes accelerated degradation of the insulation between the oil and winding, causing bubbles to form in the windings due to high temperatures [12].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, there are several advantages that monitoring provides through data collected in the field, such as: extending the life of a transformer; better planning for grid expansions or the insertion of new technologies (photovoltaics, recharging of electric vehicles, etc. ); better quality of the supplied energy; reduction of accidents and its severity; and reduction in the time of identification and location of the fault [1,9,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Application Study in the Field of Solutions for the Monitoring Distribution Transformers of the Overhead Power Grid

Chaves

Martins

Martins³

et al. 2021

Energies

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This paper will present the development and application of overhead transformers of the distribution grid, as well as the different technologies used for the gathering of electrical quantities, in the field of a monitoring solution. The solution reports the values of the quantities and alarms of operation remotely and almost in real-time. The development of this solution seeks to provide an electrical grid with greater reliability, proposing the reduction of KPIs (Key Performance Indicator), such as SAIDI (System Average Interruption Duration Index) and SAIFI (System Average Interruption Frequency Index), through more transparent monitoring of the behavior of the electrical distribution grid and its equipment. Through the research and development (R&D) project Urban Futurability, ENEL (Ente nazionale per l’energia elettrica) Distribution São Paulo seeks to apply the solution by implementing the concept of smart grids, an idea that has been growing each year by virtue of technological developments and the employment of new sensors in electrical distribution grids. Urban Futurability seeks to innovate the automation area, digital twin, and construction enhancement in the Vila Olímpia neighborhood of São Paulo, Brazil.

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Section: Applied Technologiesmentioning

confidence: 99%

Section: Hot-spot Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application Study in the Field of Solutions for the Monitoring Distribution Transformers of the Overhead Power Grid

Chaves

Martins

Martins³

et al. 2021

Energies

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Development of an Automated Distribution Grid With the Application of New Technologies

Chaves

Martins

Martins³

et al. 2022

IEEE Access

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With the advancement of technology and the application of new sensors in the electric distribution grid, in order to increase its automation, meeting the idea of smart grids, a concept that has been expanding through the years. This article describes some of the solutions and results that ENEL Distribution São Paulo has achieved, through its R&D (Research and Development) Urban Futurability project, to make its electricity distribution grid automated and in line with trends and future technologies. The project includes the installation of sensors for monitoring and protecting both the overhead and underground electricity distribution grid and medium and low voltage, digitalization of the primary substation and improvements in the communication infrastructure, seeking their complete automation. The project was applied in one of the largest urban centers in the world, the city of São Paulo, Brazil, with a diversity of load profiles, both residential and commercial, being a great place to test new technologies in different scenarios. With the increased application of automation in the electricity distribution grid, ENEL Distribution São Paulo seeks to provide its customers with a better service, with a safer and more reliable electricity distribution grid, monitored practically in real time and with state-of-the-art technologies. Therefore, the end consumers benefit from an electric distribution grid with greater availability and decreased number of interruptions.INDEX TERMS Distribution transformer sensing, fiber optic communication, fuse sensing, grid automation, primary substations digitalization, protection in the low voltage grid, underground fault tracking.

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