English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The electrical system is composed of several elements. Generation to consumption, there are equipment with their specificities, which may have linear or non-linear characteristics. A basic example of non-linear equipment is the transformer. This characteristic is due primarily to the fact that this equipment has coils wound on ferromagnetic cores, which tends to saturate with increasing magnetic flux. An ideal electric power system operates with balanced voltages. In this case, the loads connected to the system should be well balanced. However, due to the complexity and interconnections of electrical systems, it is generally considered that the real system operates with unbalanced voltages between phases. Moreover, the existence of non-linear elements in the electrical system adds complexity to the studies of the behavior of these systems in the event of disturbances. Nevertheless, other factors contribute to generate disturbances to the electrical system, for example, the electromagnetic phenomena that can arise from lightning, switching operations (Hendrickson et al., 1953), non-linear loads and short-circuits. The ferroresonance, for example, may arise in specific network topologies weakly damped when there is interaction between the capacitance and saturable reactance in the system (Roy and Roy, 2009). This phenomenon can cause overheating of conductors, including the coils of the transformers, in addition to causing stress in isolation with risks of operational failures and damage to equipment. Thus, to ensure system reliability, maintenance should be based on prevention and prediction. For this, mathematical models are developed in the expectation to represent the physical behavior of the circuit elements. This work aims to present a single-phase core-type transformer model considering an algebraic model encompassing the magnetic hysteresis losses and eddy current losses. For this, resources from Matlab/Simulink® software will be used for model implementation, process optimization, analysis, comparison and discussion of the results.

MODELO DE TRANSFORMADOR MONOFÁSICO UTILIZANDO UM MODELO GLOBAL PARA PERDAS POR HISTERESE E POR CORRENTES DE EDDY