Electric power transmission is the process by which large amounts of electricity produced at power plants, such as industrial-scale solar facilities, are transported over long distances for eventual use by consumers. In Nigeria, electricity is sent from power plants to the National transmission grid, a vast network of electric power lines. Due to the large amount of power involved, and the properties of electricity, transmission normally takes place at high voltage (69 kV or above). And in order to setup a working transmission line, all the accessories must be put in place both for low and high voltage transmission.
Assembling of high and low voltage transmission line accessories is the process of gathering all the power transmission wiring accessories in order to have complete power transmission system.
TABLE OF CONTENTS
Title Page
Approval Page
Dedication
Acknowledgement
Abstract
Table of Content
CHAPTER ONE
1.0 Introduction
1.1 Objective of the study
1.2 Significance of the study
1.3 Classification by operating voltage
CHAPTER TWO
2.0 Literature review
2.1 Review of historitical background of power transmission
2.2 Review electric power transmission
2.3 Review of high-voltage cable
2.4 Construction review of high-voltage cable
CHAPTER THREE
3.0 Methodology
3.1 Electric power transmission system
3.2.0 Assembling of power transmission wiring accessories
3.2.1 Transmission towers
3.2.2 Conductors (power lines)
3.2.3 Insulators
3.2.4 Substations
3.2.5 Earthing materials
3.3 High voltage transmission advantages and disadvantages
CHAPTER FOUR
4.1 Cable construction
CHAPTER FIVE
5.1 Conclusion
5.2 References
CHAPTER ONE
1.0 INTRODUCTION
Electric power transmission is the process by which large amounts of electricity produced at power plants, such as industrial-scale solar facilities, are transported over long distances for eventual use by consumers. In Nigeria, electricity is sent from power plants to the National transmission grid, a vast network of electric power lines. Due to the large amount of power involved, and the properties of electricity, transmission normally takes place at high voltage (69 kV or above). Electricity is usually shipped to a substation near a populated area. At the substation, the high voltage electricity is converted to lower voltages suitable for consumer use, and then shipped to end users through (relatively) low-voltage electric distribution lines.
For newly constructed solar energy power plants, if no existing suitable transmission facilities were available, new transmission lines and associated facilities would be required. The construction, operation, and decommissioning of high-voltage transmission lines and associated facilities would create a range of environmental impacts. The type and magnitude of the impacts associated with transmission line construction, operation, and decommissioning would vary depending on line type and size, as well as the length of the transmission line, and a variety of other site-specific factors.
1.1 OBJECTIVE OF THE STUDY
The objective of this study is to assemble all the electrical accessories that made up a complete power transmission system of both low and high tension system.
1.2 SIGNIFICANCE OF THE STUDY
This study make it possible for students to fully understand how electric power is been transmitted. It makes me to be able to know and understand the function of each accessory in power transmission system. Also to know the ranges of voltages that are been transmitted in overhead power transmission line.
1.3 CLASSIFICATION BY OPERATING VOLTAGE
In assembling of any electric power accessories, one must consider the supply voltage of the system. Overhead power transmission lines are classified in the electrical power industry by the range of voltages:
- Low voltage (LV) – less than 1000 volts, used for connection between a residential or small commercial customer and the utility.
- Medium voltage (MV; distribution) – between 1000 volts (1 kV) and to about 33 kV, used for distribution in urban and rural areas.
- High voltage (HV; subtransmission less than 100 kV; subtransmission or transmission at voltage such as 115 kV and 138 kV), used for sub-transmission and transmission of bulk quantities of electric power and connection to very large consumers.
- Extra high voltage (EHV; transmission) – over 230 kV, up to about 800 kV, used for long distance, very high power transmission.
- Ultra high voltage (UHV) – higher than 800 kV.
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