scholarly journals An Efficient Procedure for Temperature Calculation of High Current Leads in Large Power Transformers

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 222371-222376
Author(s):  
Wilerson V. Calil ◽  
Pablo D. Paz Salazar ◽  
Andre Souza De Melo ◽  
Eduardo Coelho Marques Costa
Keyword(s):  
Power Transformers ◽  
High Current ◽  
Large Power ◽  
Efficient Procedure ◽  
Temperature Calculation ◽  
Current Leads

Applied methodology for temperature numerical evaluation on high current leads in power transformers

2021 ◽  
Vol 131 ◽  
pp. 107014
Author(s):  
André S. de Melo ◽  
Wilerson V. Calil ◽  
Pablo D. Paz Salazar ◽  
Luisa H.B. Liboni ◽  
Eduardo C.M. Costa ◽  
...  
Keyword(s):  
Numerical Evaluation ◽  
Power Transformers ◽  
High Current ◽  
Current Leads

Modelling and Simulation of Transformer Tests under Dynamic Testing

2021 ◽  
pp. 8-16
Author(s):  
Ramesh Kumar Patel ◽  
Madhu Upadhyay
Keyword(s):  
Dynamic Testing ◽  
Short Circuit ◽  
The Other ◽  
Power Transformers ◽  
High Current ◽  
Large Power ◽  
Parameter Evaluation ◽  
Economic Functioning ◽  
The Impact ◽  
Grid Based

Large power transformers are the most important equipment for the power grid. Their reliability not only affects the availability of electricity in the supply area, but also affects the economic functioning of an energy supplier. The main objective of this work of the development of the transformer testing simulation model on the MATLAB/SIMULINK environment. The designing aspect shall comprise the generator-based and grid-based testing of the transformer and associated results on the same in the SIMULINK. And the methodology shall study the impacts on the grid-connected devices due to testing of the transformers in the grid-based method. The study concluded that there is effectively no effect on the parameter evaluation of OC and SC tests by either source. However, the practical conditions would require grid-based testing that allows a greater range of transformers of various ratings to be tested with high current capability. The impact of fault on the grid can be easily evaluated through location of fault, duration of fault, and dip if occurred. The testing should follow proper timing to avoid such disturbances on the grid. This leads to the rescheduling of the other approved outages or Short Circuit tests.

Resultant magnetic fields due to both windings and heavy current leads in large power transformers

1996 ◽  
Vol 32 (3) ◽  
pp. 1641-1644 ◽  
Author(s):  
Tang Renyuan ◽  
Li Yan ◽  
Lin Feng ◽  
Tian Lijian
Keyword(s):  
Magnetic Fields ◽  
Power Transformers ◽  
Large Power ◽  
Current Leads

The Heating System of Agricultural Facilities Using Excess Heat Power Transformers

2020 ◽  
Vol 67 (1) ◽  
pp. 42-47
Author(s):  
Anatoliy I. Sopov ◽  
Aleksandr V. Vinogradov
Keyword(s):  
System Design ◽  
Heat Supply ◽  
Cooling System ◽  
Power Transformer ◽  
Electric Heating ◽  
Heating System ◽  
Power Transformers ◽  
Large Power ◽  
Excess Heat ◽  
Power Centers

In power transformers, energy losses in the form of heat are about 2 percent of their rated power, and in transformers of large power centers reach hundreds of kilowatts. Heat is dissipated into the environment and heats the street air. Therefore, there is a need to consume this thermal energy as a source of heat supply to nearby facilities. (Research purpose) To develop methods and means of using excess heat of power transformers with improvement of their cooling system design. (Materials and methods) The authors applied following methods: analysis, synthesis, comparison, monographic, mathematical and others. They analyzed various methods for consuming excess heat from power transformers. They identified suitable heat supply sources among power transformers and potential heat consumers. The authors studied the reasons for the formation of excess heat in power transformers and found ways to conserve this heat to increase the efficiency of its selection. (Results and discussion) The authors developed an improved power transformer cooling system design to combine the functions of voltage transformation and electric heating. They conducted experiments to verify the effectiveness of decisions made. A feasibility study was carried out on the implementation of the developed system using the example of the TMG-1000/10/0.4 power transformer. (Conclusions) The authors got a new way to use the excess heat of power transformers to heat the AIC facilities. It was determined that the improved design of the power transformer and its cooling system using the developed solutions made it possible to maximize the amount of heat taken off without quality loss of voltage transformation.

scholarly journals Temperature Distribution in the Insulation System of Condenser-Type HV Bushing—Its Effect on Dielectric Response in the Frequency Domain

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 4016
Author(s):  
Krzysztof Walczak ◽  
Jaroslaw Gielniak
Keyword(s):  
Temperature Distribution ◽  
Working Conditions ◽  
Dielectric Response ◽  
Power Transformers ◽  
Response Analysis ◽  
Insulation System ◽  
Large Power ◽  
Catastrophic Failures ◽  
Significant Temperature ◽  
Specific Construction

HV bushings are an important part of the equipment of large power transformers, responsible for their many serious (including catastrophic) failures. Their proper exploitation needs to apply correct and reliable diagnostics, e.g., the use of dielectric response methods, that take into account their specific construction and working conditions. In this article, based on laboratory tests carried out on a real bushing, it has been shown that the significant temperature distribution within its core significantly affects the shape of the dielectric response of its insulation; therefore, the approach to its modeling should be changed. Hence, a new method for interpreting the results, using the so-called the 2XY model, is proposed. Subsequently, based on the measurements made on the insulators in operation, a new modeling method was verified. In conclusion, it can be stated that the 2XY model significantly improves the reliability of the dielectric response analysis, which should be confirmed in the future by tests on withdrawn and revised insulators.

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