switchgear and protection by vk mehta pdf

Switchgear And Protection By Vk Mehta Pdf

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All concepts of power systems are explained very clearly. You can get idea behind every power concept in single read. You can use principle of power system by vk mehta free download in doc format as text in image can be copied.

As of our free electrical engineering free ebook series today we are sharing a new pdf book Principles of Electronics by V. Mehta and Rohit Mehta. This is a very nice book for all students who are new to electrical and electronics engineering.

[PDF] PRINCIPLES OF POWER SYSTEM BY V. K. MEHTA.PDF

To browse Academia. Skip to main content. By using our site, you agree to our collection of information through the use of cookies. To learn more, view our Privacy Policy. Log In Sign Up. Download Free PDF. Mohamed Mashooth. Download PDF. A short summary of this paper. Many functions necessary to present-day 1.

It is practically impossible to estimate the actual magnitude of the part that energy has 1. The availability of huge amount of energy in the modern times has resulted in a 1. The greater the per capita con- 1. The modern society is so much dependent upon the use of electrical energy that it has become a part and parcel of our life.

In this chapter, we shall focus our attention on the general aspects of elec- trical energy. The present-day advancement in science and technology has made it possible to convert electrical energy into any desired form. This has given electrical energy a place of pride in the modern world.

The survival of industrial undertakings and our social structures depends primarily upon low cost and uninterrupted supply of electrical energy. In fact, the advancement of a country is measured in terms of per capita consumption of electrical energy. Electrical energy is superior to all other forms of energy due to the following reasons : i Convenient form. Electrical energy is a very convenient form of energy.

It can be easily converted into other forms of energy. For example, if we want to convert electrical energy into heat, the only thing to be done is to pass electrical current through a wire of high resistance e. Similarly, electrical energy can be converted into light e. The electrically operated machines have simple and convenient starting, control and operation. For instance, an electric motor can be started or stopped by turning on or off a switch.

Similarly, with simple arrangements, the speed of electric motors can be easily varied over the desired range. One important reason for preferring electrical energy is the flexibility that it offers.

It can be easily transported from one place to another with the help of conductors. Electrical energy is much cheaper than other forms of energy. Thus it is overall economical to use this form of energy for domestic, commercial and industrial purposes.

Electrical energy is not associated with smoke, fumes or poisonous gases. Therefore, its use ensures cleanliness and healthy conditions. The consumers of electrical energy are generally situated quite away from the centres of its production. The electrical energy can be transmitted conveniently and efficiently from the centres of generation to the consumers with the help of overhead conductors known as transmission lines.

Electrical energy is a manufactured commodity like clothing, furniture or tools. Just as the manufacture of a commodity involves the conversion of raw materials available in nature into the desired form, similarly electrical energy is produced from the forms of energy available in nature.

However, electrical energy differs in one important respect. Whereas other commodities may be produced at will and consumed as needed, the electrical energy must be produced and transmitted to the point of use at the instant it is needed. The entire process takes only a fraction of a second. This instantaneous production of electrical energy introduces technical and economical considerations unique to the electrical power industry.

Energy is available in various forms from different natural sources such as pressure head of water, chemical energy of fuels, nuclear energy of radioactive substances etc. All these forms of energy can be converted into electrical energy by the use of suitable arrangements. The arrangement essentially employs see Fig. For example, chemical energy of a fuel e.

The steam is fed to a prime mover which may be a steam engine or a steam turbine. The turbine converts heat energy of steam into mechanical energy which is further converted into electrical energy by the alternator. Similarly, other forms of energy can be converted into electrical energy by employing suitable machinery and equipment. Sources of Energy Since electrical energy is produced from energy available in various forms in nature, it is desirable to look into the various sources of energy.

Out of these sources, the energy due to Sun and wind has not been utilised on large scale due to a number of limitations. At present, the other three sources viz. The Sun is the primary source of energy.

The heat energy radiated by the Sun can be focussed over a small area by means of reflectors. This heat can be used to raise steam and electrical energy can be produced with the help of turbine-alternator combination.

However, this method has limited application because : a it requires a large area for the generation of even a small amount of electric power b it cannot be used in cloudy days or at night c it is an uneconomical method. Nevertheless, there are some locations in the world where strong solar radiation is received very regularly and the sources of mineral fuel are scanty or lacking. Such locations offer more interest to the solar plant builders.

This method can be used where wind flows for a considerable length of time. The wind energy is used to run the wind mill which drives a small generator.

In order to obtain the electrical energy from a wind mill continuously, the generator is arranged to charge the batteries. These batteries supply the energy when the wind stops. This method has the advantages that maintenance and generation costs are negligible.

However, the drawbacks of this method are a variable output, b unreliable because of uncertainty about wind pressure and c power generated is quite small. When water is stored at a suitable place, it possesses potential energy because of the head created. This water energy can be converted into mechanical energy with the help of water turbines. The water turbine drives the alternator which converts mechanical energy into electrical energy.

This method of generation of electrical energy has become very popular because it has low production and maintenance costs. The main sources of energy are fuels viz. The heat energy of these fuels is converted into mechanical energy by suitable prime movers such as steam engines, steam turbines, internal combustion engines etc.

The prime mover drives the alternator which converts mechanical energy into electrical energy. Although fuels continue to enjoy the place of chief source for the generation of electrical energy, yet their reserves are diminishing day by day.

Therefore, the present trend is to harness water power which is more or less a permanent source of power. Towards the end of Second World War, it was discovered that large amount of heat energy is liberated by the fission of uranium and other fissionable materials. It is estimated that heat produced by 1 kg of nuclear fuel is equal to that produced by tonnes of coal. The heat produced due to nuclear fission can be utilised to raise steam with suitable arrangements.

However, there are some difficulties in the use of nuclear energy. The principal ones are a high cost of nuclear plant b problem of disposal of radioactive waste and dearth of trained personnel to handle the plant. Below is given their comparison in a tabular form : S. Particular Water-power Fuels Nuclear energy 1. Initial cost High Low Highest 2. Running cost Less High Least 3. Reserves Permanent Exhaustable Inexhaustible 4. Cleanliness Cleanest Dirtiest Clean 5.

Simplicity Simplest Complex Most complex 6. Reliability Most reliable Less reliable More reliable 1. The most important forms of energy are mechanical energy, electrical energy and thermal energy. Different units have been assigned to various forms of energy. However, it must be realised that since mechanical, electrical and thermal energies are interchangeable, it is possible to assign the same unit to them. This point is clarified in Art 1. The unit of mechanical energy is newton-metre or joule on the M.

The work done on a body is one newton-metre or joule if a force of one newton moves it through a distance of one metre i. The unit of electrical energy is watt-sec or joule and is defined as follows: One watt-second or joule energy is transferred between two points if a p.

In practice, for the measurement of electrical energy, bigger units viz. Heat is a form of energy which produces the sensation of warmth.

Therefore, mechanical, electrical and thermal energies must have the same unit. This is amply established by the fact that there exists a definite relationship among the units assigned to these energies.

It will be seen that these units are related to each other by some constant. The thermal units viz. The reader may note that units of electrical energy can be converted into heat and vice-versa.

[PDF] PRINCIPLES OF POWER SYSTEM BY V. K. MEHTA.PDF

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Motor Vehicle Mechanic's Textbook. Picture of the book : 3…. Electrical Installation Work.

It also caters to the requirements of those readers who wish to increase their knowledge and gain a sound grounding in power systems as a whole. Twenty six chapters succinctly sum up the subject with topics such as Supply and Distribution Systems, Fault Calculations Symmetrical and Unsymmetrical , Voltage Control, Fuses and Circuit Breakers giving the learner an understanding of the subject and an orientation to apply the knowledge gained in real world problem solving. A book which has seen, foreseen and incorporated changes in the subject for more than 30 years, it continues to be one of the most sought after texts by the students.

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It also caters to the requirements of those readers who wish to increase their knowledge and gain a sound grounding in power systems as a whole. Twenty six chapters succinctly sum up the subject with topics such as Supply and Distribution Systems, Fault Calculations Symmetrical and Unsymmetrical , Voltage Control, Fuses and Circuit Breakers giving the learner an understanding of the subject and an orientation to apply the knowledge gained in real world problem solving.

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Power system protection book pdf Power system protection book pdf. The book, now in its second edition, continues to provide the most relevant concepts and techniques in power system protection. The second edition offers a new chapter on circuit breakers to further strengthen the text and meet the curriculum needs of several universities.

It also caters to the requirements of those readers who wish to increase their knowledge and gain a sound grounding in power systems as a whole. Twenty six chapters succinctly sum up the subject with topics such as Supply and Distribution Systems, Fault Calculations Symmetrical and Unsymmetrical , Voltage Control, Fuses and Circuit Breakers giving the learner an understanding of the subject and an orientation to apply the knowledge gained in real world problem solving. A book which has seen, foreseen and incorporated changes in the subject for more than 30 years, it continues to be one of the most sought after texts by the students. Login Invalid login details. Register For New Account.


SWITCHGEAR AND PROTECTION]. V.K. MEHTA. ROHIT MEHTA. S. CHAND & COMPANY LTD. RAM NAGAR, NEW DELHI [For B.E. / B.​Tech.


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It also caters to the requirements of those readers who wish to increase their knowledge and gain a sound grounding in power systems as a whole. Twenty six chapters succinctly sum up the subject with topics such as Supply and Distribution Systems, Fault Calculations Symmetrical and Unsymmetrical , Voltage Control, Fuses and Circuit Breakers giving the learner an understanding of the subject and an orientation to apply the knowledge gained in real world problem solving. A book which has seen, foreseen and incorporated changes in the subject for more than 30 years, it continues to be one of the most sought after texts by the students. Login Invalid login details. Register For New Account.

Principles of Power System (Multicolor Edition), 24/e

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