Mihir N. Velani
Other affiliations: Gujarat Technological University
Bio: Mihir N. Velani is an academic researcher from RK University. The author has contributed to research in topics: Epoxy & Surge arrester. The author has an hindex of 1, co-authored 7 publications receiving 3 citations. Previous affiliations of Mihir N. Velani include Gujarat Technological University.
••01 Aug 2017
TL;DR: The paper displays the possible comparisons between porcelain and polymeric housed surge arrester and points out the same incorporating suitable solutions to moderate them.
Abstract: In the present development, a metal-oxide surge arrester (MOSA) introduces an extremely non-linear characteristic sufficient to ground the surges like lightning strokes and other over voltages. Although a revolutionary work has been done in this particular field, the device still looks some insufficiencies. The study points out the same incorporating suitable solutions to moderate them. The paper also displays the possible comparisons between porcelain and polymeric housed surge arrester.
TL;DR: In this article, the role of nanodielectrics in the electrical power system is becoming crucial owing to its superior properties and potential applications in the field, yet, the materials face limited breakdown st...
Abstract: The role of nanodielectrics in the electrical power system is becoming crucial owing to its superior properties and potential applications in the field. Yet, the materials face limited breakdown st...
••01 Dec 2018
TL;DR: In the present work, to reinforce the green building concept at the university level, the efforts are put behind the lighting scheme and solar energy conservation, a scientific approach has been employed to increase visual and operative value.
Abstract: Development of green building has a crucial role to play to reduce the energy consumption and make efficient use of materials and energy across the globe. The advances in sustainable development benefit society, environment, and economy by conserving and restoring energy sources. In the present work, to reinforce the green building concept at the university level, the efforts are put behind the lighting scheme and solar energy conservation. In order to design an efficient lighting scheme, a scientific approach has been employed to increase visual and operative value. Harnessing solar energy on the other side, is also addressed with a view to reducing the consumption of conventional electrical energy. It focuses on the optimum design of the solar photovoltaic system for running electrical appliances. Particularly, the attention has also been paid to the technical specifications of the battery bank. At the later stage of the work, an illumination and an energy audit have been conducted for the proposed designs in terms of energy conservation, design, and implementation, cost-effective solutions, and savings in carbon emissions.
TL;DR: In this article, the effects of learning and assessment methods to achieve designated program specific outcomes (PSOs) and course outcomes (COs) through visible learning have been analyzed with Hattie's effect size that influences the program and course achievement.
Abstract: The assessment and teaching strategies are chief indicators of comprehended learning in the field of education. They are the critical moves in the learning process, specifically when related to engineering and science. The mediocre content delivery and inferior assessment affect several educational spheres, such as faculty development, student scores, placement, and life-long experience. These two factors considerably regulate the programspecific outcomes (PSOs) and course outcomes (COs). The present work focuses on analyzing the effects of learning and assessment methods to achieve the designated PSOs and COs through visible learning. The analysis has been carried out with Hattie's effect size that influences the program and course achievement. The process was monitored for two subjects offered to the limited population of undergraduate students of Electrical Engineering. The statistics have been derived in the effect size affected by the source of influence, aspect, and factor. Further, the possibilities of incorporating formative evaluation and visible learning in Indian engineering education is framed in the discussion.
TL;DR: In this article, the effect of % volume fraction and frequencies on capacitance, real permittivity, displacement current density, and conduction current density of ZnO (zincoxide)-based epoxy nanocomposites is discussed.
Abstract: In recent times, epoxy nanocomposites have been considered as a potential indoor insulation application in power apparatuses due to significantly improved electrical and thermal properties over conventional insulators. The paper discusses the FE analysis of electrical properties of ZnO (zinc-oxide)-based epoxy nanocomposites. The results demonstrate the effect of % volume fraction and frequencies on capacitance, real permittivity, displacement current density, and conduction current density. It has shown the capacitance has changed by 21.36% with a 10% volume fraction at 1000 Hz as compared to the neat epoxy. Besides, the reasons for the advancement in real permittivity and current densities have been discussed.
••01 Dec 2016
TL;DR: In this article, a commercial multi-storied buildings are designed for them to respond to the grid availability without affecting the working and life-style of people in the building to a significant extent.
Abstract: As India tries to add significant renewables to its coal-dominated energy mix, the problem of intermittent generation associated with renewables, is likely to be a problem Even though battery prices have been falling rapidly, any serious grid-level storage will push up the price of electricity beyond the affordability limit for a large section of Indian people The answer is in developing techniques, practices and policies, which enables the consumers to carry out load-management in response to grid-power availability If grid-power is surplus, the customer uses grid to the maximal extent, but when grid-power is in deficit, it uses it to minimal extent This paper focuses on commercial multi-storied buildings and discusses how power-systems can be designed for them to respond to the grid-availability without affecting the working and life-style of people in the building to a significant extent It proposes use of roof-top solar and DC power-line within buildings along with DC-powered appliances to significantly save energy It incorporates battery-storage and chilled-water storage, which coupled with use of DC motors or variable frequency drives, can help building cut its load to almost 50% or even less during grid-power shortage and draw power more than its load during surplus situation The paper goes beyond the concept and discusses actual implementation being carried out today It also discusses policies which will accelerate deployment of such designs benefiting both the customer as well as the grid-supply
05 Sep 2016
TL;DR: In this article, the authors have presented an effort of 6th years teaching a course entitled "Utilization of Electrical Energy" at the Department of Electrical Engineering, Faculty of Engineering, Omar Elmoktar university, El-bieda, Libya.
Abstract: This book is the effort of 6th years teaching a course entitled "Utilization of Electrical Energy" at the Department of Electrical Engineering, Faculty of Engineering, Omar-Elmoktar university, El-bieda, Libya. Examples and problems appeared by the end of all chapters were given in both exercises projects and examination problems for this course. The book is divided into two parts. The first part for illumination and it is subdivided into four chapters. The second part for electric traction and it is subdivided into three chapters. Chapter 1: It presents introduction about the illumination like nature of light and terms used in illumination Chapter 2: It presents laws of illumination, Law of inverse squares and Lambert’s cosine law. Chapter 3: It presents different sources of light Chapter 4: It presents design of lighting schemes. Indoor design and outdoor design are given in this chapter. Chapter 5: It presents different Systems of traction for railroad operation. Chapter 6: It presents mechanics of train motion. The relation between the speed, time, and energy is explained. Speed time curves. Chapter 7: It presents different types of traction motors.
10 Nov 2022
TL;DR: In this paper , a finite element simulation modeling method for zinc oxide arrester is proposed, of which the accuracy is verified through experiments, and simulation analysis of the leakage current characteristics of 220kV arresters under different damp conditions is conducted, which provides a reference for online monitoring and early warning of the arresters.
Abstract: In order to protect high-voltage cables from lightning overvoltage and operating overvoltage, lightning arresters should be installed at both ends of the high-voltage cable. According to the resistive component of leakage current, the operating status of the zinc oxide arrester can be effectively judged. A finite element simulation modeling method for zinc oxide arrester is proposed, of which the accuracy is verified through experiments. The simulation analysis of the leakage current characteristics of 220kV arresters under different damp conditions was conducted, which provides a reference for online monitoring and early warning of the arresters.
TL;DR: In this article , the authors proposed a Cu/polymer hybrid bonding interface beyond the standard Cu/SiO2 hybrid bonding to enable the commercialization of ultra-fine pitch high-density 3D packages.
Abstract: Hybrid bonding enables the commercialization of ultra-fine pitch high-density 3D packages. Cu/SiO2 hybrid bonding is the standard packing interface recently introduced in the industry. Here, the Cu/polymer hybrid bonding interface beyond Cu/SiO2 is proposed in order to have high compatibility for additional processes in the future. Ideally, polymers can provide excellent bonding strength and low permittivity, enabling high-speed signal transmission with high reliability. To realize it, optimum polymer and additives selection and polymer bonding processing development are needed to get the desired packaging interface. Therefore, detailed materials and processing challenges are discussed to realize the successful Cu/polymer hybrid bonding. Then, the authors’ preliminary results are suggested to supplement the feasibility of the emerging bonding technology.
TL;DR: In this article , the authors dissected the components of complex permittivity in epoxy/ZnO nano and micro composites that were synthesized using different methods, utilizing dielectric spectroscopy as per ASTM D150.
Abstract: Abstract Polymeric epoxy-based nanocomposites have rapidly developed in high energy density and power industry components. The composite insulation undergoes harsh extreme temperature conditions and a high electric field with varying frequencies. This paper dissects the components of complex permittivity in epoxy/ZnO nano and micro composites that were synthesized using different methods, utilizing dielectric spectroscopy as per ASTM D150. The performance of the composites was studied by analyzing the spectra over a frequency range spanning from 1 mHz to 1 kHz. We presume interfacial polarization arises in the composites due to particle clustering. Furthermore, we evaluated the effect of varying filler concentration at 25, 50, 70, and 90 °C. The real permittivity positions the α-steps at 70 and 90 °C. The real and imaginary permittivities remain largely unpretentious by the synthesis method over the entire frequency range.