This document provides revision notes on basics of electricity. It discusses the key conditions needed for electricity to flow, including having a source of electrical energy like a dry cell and a closed circuit. It defines common electrical components like switches and describes how they work. It also explains concepts such as electric current, voltage, resistance, and how these can be measured using instruments like ammeters and voltmeters. Examples are given throughout to illustrate the concepts discussed.
In electrical engineering terminology, transformers are regarded as electrical machines, although they only convert one form of electricity into another form of electricity. Due to this relatively simple function, among other reasons, their losses are lower than those of any equipment converting electricity into some other form of energy. They are probably the most efficient machines ever devised by man.
Transformer efficiencies are around 80% for very small units used in domestic appliances and nearly 99% at the level of distribution networks. The efficiency further increases with increasing unit power rating. The largest units achieve efficiencies of up to 99.75% at rated load and even 99.8% at half load. At first glance, it looks rather unlikely that there is any savings potential left that would be commercially significant, but in fact there is.
It is true that the payback periods are fairly long, but a transformer has a lifetime expectancy of well over 40 years and the majority of all transformers are operated continuously at a high degree of loading. As a result, an improved transformer design, primarily through the use of more active material, will usually pay off several times over the lifespan of the transformer.
Exponential growth in the energy demand on account of rising population and economic growth,
increasing apprehensions of energy security coupled with climate change and global warming concerns are some
of the major drivers for pushing the renewable energy (RE) to the top of the energy portfolio. Among various
renewable energy resources, wind and solar PV systems are experiencing rapid growth since 2010. By the end of
2016, the world total capacity of wind power generation was 487 GW and that of solar PV was 303 GW,
aggregating to a penetration level of 4.0% and 1.5% respectively. Global renewable energy penetration till Dec.
2016, excluding conventional hydro share (of 16.6%) was only around 8.0%. However, many countries have set
target of 30% RE based electricity generation by 2030. India has an ambitious target of achieving 175 GW of RE
power by 2022, with 100 GW from solar, 60 GW from wind, 10 GW from biomass and 5 GW from small hydro.
Power generation from renewables often takes place through distributed generation (DG). These units, mostly
located in remote locations, are not centrally planned or dispatched, and are usually connected to distribution grids
at LV or MV levels. In few cases, large capacity RE generation are also connected to transmission networks. As a
result, the power generation structure is moving from the large, centralized plants to a mixed generation pool
consisting of traditional large plants and many smaller DG units. Most of the RE generators have electrical
characteristics that are different from the synchronous machines. Since a large group of DG technologies use
power electronics converters for grid connectivity, they introduce many technical issues related to the operation,
control and protection of the power system, impacting generators, transmission system and consumer devices.
This paper presents some of the technical issues and challenges that need to be addressed for the effective
grid integration of RE based power generators so that eventually, our reliance on polluting and expensive fossilbased
hydro-carbon driven power generation can be reduced substantially.
In electrical engineering terminology, transformers are regarded as electrical machines, although they only convert one form of electricity into another form of electricity. Due to this relatively simple function, among other reasons, their losses are lower than those of any equipment converting electricity into some other form of energy. They are probably the most efficient machines ever devised by man.
Transformer efficiencies are around 80% for very small units used in domestic appliances and nearly 99% at the level of distribution networks. The efficiency further increases with increasing unit power rating. The largest units achieve efficiencies of up to 99.75% at rated load and even 99.8% at half load. At first glance, it looks rather unlikely that there is any savings potential left that would be commercially significant, but in fact there is.
It is true that the payback periods are fairly long, but a transformer has a lifetime expectancy of well over 40 years and the majority of all transformers are operated continuously at a high degree of loading. As a result, an improved transformer design, primarily through the use of more active material, will usually pay off several times over the lifespan of the transformer.
Exponential growth in the energy demand on account of rising population and economic growth,
increasing apprehensions of energy security coupled with climate change and global warming concerns are some
of the major drivers for pushing the renewable energy (RE) to the top of the energy portfolio. Among various
renewable energy resources, wind and solar PV systems are experiencing rapid growth since 2010. By the end of
2016, the world total capacity of wind power generation was 487 GW and that of solar PV was 303 GW,
aggregating to a penetration level of 4.0% and 1.5% respectively. Global renewable energy penetration till Dec.
2016, excluding conventional hydro share (of 16.6%) was only around 8.0%. However, many countries have set
target of 30% RE based electricity generation by 2030. India has an ambitious target of achieving 175 GW of RE
power by 2022, with 100 GW from solar, 60 GW from wind, 10 GW from biomass and 5 GW from small hydro.
Power generation from renewables often takes place through distributed generation (DG). These units, mostly
located in remote locations, are not centrally planned or dispatched, and are usually connected to distribution grids
at LV or MV levels. In few cases, large capacity RE generation are also connected to transmission networks. As a
result, the power generation structure is moving from the large, centralized plants to a mixed generation pool
consisting of traditional large plants and many smaller DG units. Most of the RE generators have electrical
characteristics that are different from the synchronous machines. Since a large group of DG technologies use
power electronics converters for grid connectivity, they introduce many technical issues related to the operation,
control and protection of the power system, impacting generators, transmission system and consumer devices.
This paper presents some of the technical issues and challenges that need to be addressed for the effective
grid integration of RE based power generators so that eventually, our reliance on polluting and expensive fossilbased
hydro-carbon driven power generation can be reduced substantially.
PROJECT ON AUTOMATIC TRANSFER SWITCH (ELECTRICAL).pdfRomeo INKOOM
A project done towards the award of a degree at ACCRA INSTITUTE OF TECHNOLOGY.
It entails the design and construction work of an ATS system to solve the reliability or instability of power in our industries.
A comparative study has been carried by Gensol on Solar-Wind Hybrid Policies issued by Central Government, Gujarat State & Andhra Pradesh (A.P.) in terms of following:
1) Incentives & Pertinent Charges
2) Evacuation & Metering Scheme
3) Energy Accounting & Banking
4) AC-DC Integration & other important clauses.
Resistance,bundled conductor,skin effect,proximity effect
Proximity effect depends on:
Frequency of the current
Conductor size
Permeability of material
Efficiency and Loss Evaluation of Large Power TransformersLeonardo ENERGY
All power transformers have very high energy efficiency—the largest are probably the most efficient machines ever devised. However, there is still scope for improvement. Any improvement in the performance of large transformers offers the potential of genuine economic benefits because their throughput and their continuous duty mean that the energy they waste is likewise enormous.
This Application Note discusses the nature of power transformer losses and evaluates those losses from an economic and ecological point of view. There is no general rule on how to design a power transformer for minimum life cycle cost. It has to be approached case by case, based on an estimate of the load profile. This Application Note also tackles the question whether an over-sized transformer is always an energy efficient transformer, and it contains a chapter on the choice of the conductor material.
PROJECT ON AUTOMATIC TRANSFER SWITCH (ELECTRICAL).pdfRomeo INKOOM
A project done towards the award of a degree at ACCRA INSTITUTE OF TECHNOLOGY.
It entails the design and construction work of an ATS system to solve the reliability or instability of power in our industries.
A comparative study has been carried by Gensol on Solar-Wind Hybrid Policies issued by Central Government, Gujarat State & Andhra Pradesh (A.P.) in terms of following:
1) Incentives & Pertinent Charges
2) Evacuation & Metering Scheme
3) Energy Accounting & Banking
4) AC-DC Integration & other important clauses.
Resistance,bundled conductor,skin effect,proximity effect
Proximity effect depends on:
Frequency of the current
Conductor size
Permeability of material
Efficiency and Loss Evaluation of Large Power TransformersLeonardo ENERGY
All power transformers have very high energy efficiency—the largest are probably the most efficient machines ever devised. However, there is still scope for improvement. Any improvement in the performance of large transformers offers the potential of genuine economic benefits because their throughput and their continuous duty mean that the energy they waste is likewise enormous.
This Application Note discusses the nature of power transformer losses and evaluates those losses from an economic and ecological point of view. There is no general rule on how to design a power transformer for minimum life cycle cost. It has to be approached case by case, based on an estimate of the load profile. This Application Note also tackles the question whether an over-sized transformer is always an energy efficient transformer, and it contains a chapter on the choice of the conductor material.
this presentation is based on magnetic effect of electric current, a which many of us have studies or will be studying in higher classes.this presentation is a better way of understanding the topic and in a visual way
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
