Electrical studies involve detailed analyses and evaluations conducted on electrical systems to understand their behavior, performance, and safety. These studies are carried out by experts and involve the use of simulation tools, modeling, and calculations to gain a comprehensive understanding of the electrical system.
HVEX originates from graduates, masters, and doctors from the High Voltage Laboratory at the Federal University of Itajubá – UNIFEI.
In our unit, we develop innovative research and development (R&D) projects aimed at solving the challenges that maintenance teams face daily and improving the quality of energy supplied by utilities.
Our services are focused on developing solutions for the electrical sector, emphasizing technical quality and the relevance of results for the market and society.
The insulation coordination study selects or verifies the dielectric withstand capability of equipment in relation to electrical system overvoltages. It considers protection equipment characteristics, evaluating dielectric demands of temporary, switching, and atmospheric overvoltages.
This study aims to determine phase-to-ground or phase-to-phase dielectric demands resulting from load rejections, single-phase short circuits, ferroresonance, etc. This type of overvoltage is oscillatory and weakly damped. This study is crucial for determining and verifying the thermal capacity of zinc oxide (ZnO) surge arresters.
Switching overvoltage studies are also critical in determining the thermal capacity of ZnO surge arresters, as well as in determining safety distances between structures and conductors in transmission lines.
This type of study requires an analysis of possible maneuvers leading to the most conservative results. Cases involving energization, re-energization, and application of faults in transmission lines are typically evaluated. Energization of capacitive loads and rejection of inductive loads may also be considered.
This study evaluates overvoltages due to direct lightning strikes on transmission lines, analyzing surges in the substation and the risk of insulation failures. The results verify whether the withstand voltages of the equipment are sized correctly, considering the precise position of each item in the substation, such as lightning arresters, circuit breakers, and transformers, which directly impact overvoltages.