![Power System Grounding and Transients](https://img.perlego.com/book-covers/1498636/9781351423106_300_450.webp)
eBook - ePub
Power System Grounding and Transients
An Introduction
A.P. Sakis Meliopoulis
This is a test
- 472 pages
- English
- ePUB (mobile friendly)
- Available on iOS & Android
eBook - ePub
Power System Grounding and Transients
An Introduction
A.P. Sakis Meliopoulis
Book details
Book preview
Table of contents
Citations
About This Book
""This authoritative work presents detailed coverage of modern modeling and analysis techniques used in the design of electric power transmission systems -- emphasizing grounding and transients. It provides the theoretical background necessary for understanding problems related to grounding systems, such as safety and protection.
Frequently asked questions
How do I cancel my subscription?
Can/how do I download books?
At the moment all of our mobile-responsive ePub books are available to download via the app. Most of our PDFs are also available to download and we're working on making the final remaining ones downloadable now. Learn more here.
What is the difference between the pricing plans?
Both plans give you full access to the library and all of Perlego’s features. The only differences are the price and subscription period: With the annual plan you’ll save around 30% compared to 12 months on the monthly plan.
What is Perlego?
We are an online textbook subscription service, where you can get access to an entire online library for less than the price of a single book per month. With over 1 million books across 1000+ topics, we’ve got you covered! Learn more here.
Do you support text-to-speech?
Look out for the read-aloud symbol on your next book to see if you can listen to it. The read-aloud tool reads text aloud for you, highlighting the text as it is being read. You can pause it, speed it up and slow it down. Learn more here.
Is Power System Grounding and Transients an online PDF/ePUB?
Yes, you can access Power System Grounding and Transients by A.P. Sakis Meliopoulis in PDF and/or ePUB format, as well as other popular books in Technologie et ingénierie & Ingénierie de l'électricité et des télécommunications. We have over one million books available in our catalogue for you to explore.
Information
1
Power Transmission Systems
1.1 Introduction
This book addresses the topics of power system grounding and transients. The two topics are as old as power engineering itself. Since the early days of power system engineering, the two topics were investigated experimentally and appropriate solutions were invented which resulted in established practices. As power systems grew in size and complexity, it became necessary to reevaluate present practices and to improve design procedures of grounding systems and protection against transient overvoltages. Recent technology advancements coupled with research efforts resulted in improved models for the analysis of grounding systems and analysis of transient phenomena in power systems. The improved analytical models are the cornerstone for better designs of power systems apparatus and installations.
Analytically, the two topics are closely interrelated. Specifically, the theoretical bases for building analytical models for the study of these phenomena are similar. In subsequent chapters we introduce the modeling procedures and examine specific applications, such as design of grounding systems, protection against electrical transients, and so on. In this chapter we introduce basic definitions and nomenclature and discuss the general characteristics of the systems and phenomena to be studied in this book.
1.2 Basic Definitions and Nomenclature
In this section we introduce basic definitions and nomenclature that will be utilized throughout the book. First, instantaneous values of voltages and currents will be denoted by lowercase letters. for example, v(t) and i(t) denote the instantaneous value of voltage and current, respectively, as a function of time.
Many power system analysis problems deal with the power system operating under steady-state conditions. The generating units of the system generate nearly sinusoidal voltages and currents. In this case the voltage or current at any point of the system is varying sinusoidally with time. In general, the sinusoidally varying voltage or current is expressed as follows:
where
V or I = rms value of the voltage or current
ω = angular frequency
φ, θ = phase angles
The sinusoidal voltage or current of (1.1) can also be represented with phasors. The phasors are complex numbers and provide an alternative way for representing sinusoidal waveforms. The phasors will be denoted by uppercase letters with a “~” above them. Thus the voltage and current phasors representing Eqs. (1.1) are denoted by and Ĩ, respectively. The instantaneous values of the voltage or current is by definition
where Re{Z} means the real part of the complex number Z. By equating Eqs. (1.1) and (1.2), it is apparent that
The majority of power systems comprise three-phase arrangements. It is expedient to introduce terms and definitions that will be used extensively in describing these systems.
In general, a three-phase system is constructed with single elements that are connected in a three-phase arrangement. Examples are electric loads, transformers, and motors. The elements may be connected in a delta or a wye configuration or any combination of these two. The delta and wye connections are illustrated in Fig. 1.1. For the description of three-phase systems, the following definitions are introduced:
Definition 1.1: Balanced Set of Three-Phase Voltages. A set of three-phase voltages, va(t), vb(t), vc(t), is called balanced if and only if :
The voltages vary sinusoidally with time.
The amplitudes of the voltages are equal.
There is a 120° phase difference between any two.
As an example, the following set of three-phase voltages is balanced:
In Eqs. (1.4), the phase difference between the phase a voltage and the phase b voltage is 120° and positive. This phase relationship among the three phases will be called the positive phase sequence. A three-phase generator generates a set of three-phase voltages that are nearly balanced and of the positive phase sequence. It is expedient to introduce the concept of an ideal three-phase source, which is illustrated in Fig. 1.2. An ideal three-phase source generates a set of balanced three-phase voltages of the positive or negative phase sequence. It is apparent that a set of balanced three-phase voltages is completely described with the voltage magnitude V, the angular frequency ω, the phase angle φ, and the sequence. Alternatively, it can be completely defined with the phasor of the phase a voltage, , and the sequence. Throughout the text, when...
Table of contents
- Cover
- Half Title
- Title Page
- Copyright Page
- Dedication
- Table of Contents
- Preface
- 1. POWER TRANSMISSION SYSTEMS
- 2. TRANSMISSION LINE MODELING: LINE INDUCTANCE
- 3. TRANSMISSION LINE MODELING: LINE RESISTANCE
- 4. TRANSMISSION LINE MODELING: LINE CAPACITANCE
- 5. POWER SYSTEM GROUNDING I: MODELING TECHNIQUES
- 6. TRANSMISSION LINE ANALYSIS
- 7. POWER SYSTEM FAULT ANALYSIS
- 8. POWER SYSTEM GROUNDING II: DESIGN PROCEDURE
- 9. POWER SYSTEM TRANSIENTS
- References
- Appendix
- Index
Citation styles for Power System Grounding and Transients
APA 6 Citation
Meliopoulis, S. (2017). Power System Grounding and Transients (1st ed.). CRC Press. Retrieved from https://www.perlego.com/book/1498636/power-system-grounding-and-transients-an-introduction-pdf (Original work published 2017)
Chicago Citation
Meliopoulis, Sakis. (2017) 2017. Power System Grounding and Transients. 1st ed. CRC Press. https://www.perlego.com/book/1498636/power-system-grounding-and-transients-an-introduction-pdf.
Harvard Citation
Meliopoulis, S. (2017) Power System Grounding and Transients. 1st edn. CRC Press. Available at: https://www.perlego.com/book/1498636/power-system-grounding-and-transients-an-introduction-pdf (Accessed: 14 October 2022).
MLA 7 Citation
Meliopoulis, Sakis. Power System Grounding and Transients. 1st ed. CRC Press, 2017. Web. 14 Oct. 2022.