A5075560369- Power Transformer Diagnostics and Insulation
- High voltage insulation and dielectric phenomena
- Magnetic Properties and Applications
- Thermal Analysis in Power Transmission
- Power Quality and Harmonics
- Lightning and Electromagnetic Phenomena
- Non-Destructive Testing Techniques
- Fusion materials and technologies
- Nuclear Materials and Properties
- Nuclear reactor physics and engineering
Universidade de São Paulo
2019-2024
Hitachi (Sweden)
2024
Dynamic rating of the transformer is a promising technology, which suitable for various applications. Using dynamic connecting renewable energy believed to be beneficial economy and flexibility power system. However, safely deploy such operation strategies, it important have more precise estimates total costs owning units determine how effective method solar plant. This study proposes calculating ownership (TOC) dynamically rated transformers used connection plant grid as well analyzes its...
This article presents an efficient methodology for calculating the steady-state temperature of high current busbar leads (HCBL) oil-immersed in large power transformers. The at surface copper HCBL is mainly affected by Joule effect caused passing current, paper insulation, top oil rise, and ambient temperature. Power Transformer Manufacturers usually follow their proprietary technical specifications design absence normalization, customers would request guidance calculations independently...
A routine using multiple methods is proposed for detecting and locating hot spots in power transformers based on thermographic measurements advanced computational analytical techniques. The method identifies oxide hydrocarbon gases dissolved the insulation oil of use well‐established key gas to provide information about cause spots, such as partial discharge, electric arc, overload heating. then uses infrared mappings temperature find approximate location and, finally, finite element an...
This paper describes a modern method to calculate the saturated and non-saturated reactances of quasi-linear reactors. The reactor studied is single-phase unit with two non-concentric windings without magnetic core, but shields tank. geometry requires 3-D calculations. To achieve highest accuracy, FEM based program time harmonic solver was utilized reactive energy in system. With energy, reactance calculated. Simulations were made total self reactances. mutual calculated by means, aid...
The shunt reactors operate under a very specific conditions in Gas Insulated Substations - GIS, especially during fast electromagnetic transients due to switching and maneuver operations. A meticulous analysis for correct design of such power devices, on the insulation coordination between turns, discs, from winding ground. This article presents step-by-step modeling methodology based Finite Element Method, which is applied conception manufacturing real reactor GISs. Finally, time-...