ABSTRACT
In this article, Simulink is used to implement the open and short circuit tests of three-phase transformers. With most universities switching to online methods of teaching in the wake of the coronavirus pandemic, this article outlines how to perform the transformer tests for undergraduate electric machines classes using Simulink. The aim is present the virtual experiments whose results lead to determination of the approximate per-phase equivalent circuit model of a three-phase power transformer. The article will be of help for students who cannot attend conventional practical laboratory sessions due to COVID-19 standard operating procedures restrictions or shortage of equipment and will be a great supplement for those who can. © 2022 IST-Africa Institute and Authors.
ABSTRACT
Control courses are important parts of the curricula of Control & Automation Engineering and Electrical Engineering. In this area, as in Engineering curricula in general, experimentation is of paramount importance. Engineering curricula have always had many lab classes for students to perform experiments - lab classes were hosted in traditional brick and mortar environments. The current status of technology allows for experiments to remotely be performed. Remote Labs are used in many institutions over the world as well as Virtual Labs. Due to the COVID-19 Pandemic, these solutions have gained greater importance. This work addresses the use of an Electric and Electronic Circuit Lab in a Control Course to perform Analog Simulations. It introduces the characteristics of the Remote Lab as well as the way it was used to enhance the learning of systems of different natures. This Remote Lab had been in use at the institution since the second semester of 2016 but in Electric Circuits and General Electricity courses. The Institution has been implementing other Remote Labs too. This work focuses the school years of 2020 and 2021, and addresses the plans for the near future. The main topics to be discussed are: the context at the University, the Control Course, the technological tools that have been in use for many years and how Remote Labs in general have been used. VISIR - Virtual Instrument Systems in Reality, the Remote Lab for Electric and Electronic Circuits is briefly described. © 2022 IEEE.
ABSTRACT
The conversion of hand-drawn circuit to digital image is very essential for designers to save their rough sketch. Due to COVID-19, the teaching-learning process has become completely virtual. In this scenario, the present work on conversion of hand-drawn circuit to digital circuit is expected to help the faculty and students of engineering circuit branches. The MobileNet SSD architecture is used for detection of resistors, capacitors, inductors and battery in the hand-drawn circuit. Image overlay and skeletonization technique are used to obtain the digital image. In the present work, very few electrical components are considered for modeling;however, the proposed system can be extended (trained) for more number of electrical components and can be deployed in mobile applications with ease. © 2021 IEEE.
ABSTRACT
In physics and engineering, circuit modeling together with simple element models has been used to study concurrent physical phenomena. By using simple calculations, the underlying mechanisms that determine certain patterns can be understood. Here, we present a simple mathematical model to describe the COVID-19 pandemic time evolution. The model accounts for three phases occurring at the same pandemic wave, which are influenced by different mechanisms represented by a linear, an exponential, and a power law term, corresponding to an early stage of the contagious spread, an unconstrained spread, and a power-law increase defined by the effectiveness of the social distancing, respectively. This approach is based on parallel and series natural phenomena occurring in electrical circuits. The generality of the present tool is demonstrated using empirical data of nine countries from different continents. © 2022 Author(s).
ABSTRACT
The Covid-19 pandemic has had a major impact on the world of education. One of the impacts is related to the learning process of electrical circuits. Online lectures make students have difficulty in studying electrical circuit courses. An appropriate learning media is needed as a solution to overcome these problems. This study aims to develop electrical circuit learning media using virtual simulations and determine the feasibility of applying the media. This type of research is research and development with the ADDIE model. The stages of development carried out are Analyze, Design, Development, Implementation, and Evaluation. The research was conducted at the Electrical Engineering Education Study Program, Faculty of Engineering, UNY. The virtual simulation used is a Falstad circuit simulation. This simulation can be accessed online or offline. In this research, the focus is on developing learning media using online Falstad simulation. The results showed that 1) the electric circuit learning media using virtual simulations can run well, 2) based on user trials, the electrical circuit learning media using virtual simulation is classified as very feasible. © 2021 Institute of Physics Publishing. All rights reserved.