Electrical power can be transmitted through overhead power lines or underground cables. Each method has benefits and drawbacks. Overhead lines are cheaper and easier to install but less safe, while underground cables are more expensive but safer. The choice depends on factors like voltage, cost, safety, and the application. Overhead lines are generally used for their lower cost and ability to transmit higher voltages, while underground cables are used where overhead lines present safety issues or cannot be implemented.
The topic mainly deals about different methods of high power Underground transmission systems currently implemented across the world as well as about the modern GIL systems.
It also explain about the advantages, construction and features of GIL (Gas Insulated Transmission Lines) by highlighting its future scope as well.
Construction of cables
Parts of a cable
Properties of cable insulators
Properties of conductors
Types of cables
Underground cables
Methods of laying underground cables
Types of cable faults
Comparison between overhead and underground cables
The topic mainly deals about different methods of high power Underground transmission systems currently implemented across the world as well as about the modern GIL systems.
It also explain about the advantages, construction and features of GIL (Gas Insulated Transmission Lines) by highlighting its future scope as well.
Construction of cables
Parts of a cable
Properties of cable insulators
Properties of conductors
Types of cables
Underground cables
Methods of laying underground cables
Types of cable faults
Comparison between overhead and underground cables
Basic Difference Between Wires and CablesDr.Raja R
Basic Difference Between Wires and Cables
What’s the basic difference between Wires and Cables?
List some of the basic differences between Wires and Cables
Different uses of Wire and Cable
Types of Wire and Cable
Different advantages of using Wire and Cable
Basic Difference Between Wires and CablesDr.Raja R
Basic Difference Between Wires and Cables
What’s the basic difference between Wires and Cables?
List some of the basic differences between Wires and Cables
Different uses of Wire and Cable
Types of Wire and Cable
Different advantages of using Wire and Cable
Underground Wiring System : A Comprehensive Guide by We-Bore-ItWe-Bore-It
Underground wiring is widely implemented by drilling contractors all around the world for burying cables – as the name implies – under the ground. They are preferred in situations where overhead cables are not feasible to implement, especially in heavily populated areas. This document by We-Bore-It explains various advantages and disadvantages of underground wiring system and the different installation methods used for it.
Underground cables are used for power applications where it is impractical, difficult, or dangerous to use the overhead lines. They are widely used in densely populated urban areas, in factories, and even to supply power from the overhead posts to the consumer premises.
The underground cables have several advantages over the overhead lines; they have smaller voltage drops, low chances of developing faults and have low maintenance costs. However, they are more expensive to manufacture, and their cost may vary depending on the construction as well as the voltage rating.
The underground cables are classified in two ways; by the voltage capacity, or by the construction.
By Voltage
LT cables: Low-tension cables with a maximum capacity of 1000 V
HT Cables: High-tension cables with a maximum of 11KV
ST cables: Super-tension cables with a rating of between 22 KV and 33 KV
EHT cables: Extra high-tension cables with a rating of between 33 KV and 66 KV
Extra super voltage cables: with maximum voltage ratings beyond 132 KV
By Construction
Belted cables: Maximum voltage of 11KVA
Screened cables: Maximum voltage of 66 KVA
Pressure cables: the Maximum voltage of more than 66KVA
8 step-by-step processes of manufacturing of electrical cableDevanshVarma1
The manufacturing process of electrical wires and cables is complicated. If the manufacturers don’t provide good quality products, the wires will not be the perfect conductor to produce electricity.
In early days, there was a little demand for electrical energy so that small power stations were built to supply lighting and heating loads. However, the widespread use of electrical energy by modern civilisation has necessitated to produce bulk electrical energy economically and efficiently.
The increased demand of electrical energy can be met by building big power stations at favourable places where fuel (coal or gas) or water energy is available in abundance.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
2. • Electrical power is transmitted through
either overhead power lines or
underground cables.
• Each of the two types of cables has its
benefits as well as disadvantages as well
as places where they are commonly used.
• The choice of which method to use is
• The choice of which method to use is
influenced by voltage, cost, safety, type of
application, and other factors.
• While the overhead lines are cheap, easy
to install, troubleshoot and upgrade, the
same cannot be said about the
underground cables.
3. • Underground cables have their place too,
and despite being expensive, they have
several advantages.
• These are mostly used where it is
dangerous to have overhead lines such as
densely populated areas as well as in
providing the missing link in areas where
providing the missing link in areas where
overhead lines cannot be used.
• Due to cost, physical and environmental
factors, the two types of cables are usually
combined together in most situations.
4. • Construction:
– Underground cables are more expensive to
construct since they have to be electrically
insulated and have protection against
moisture, corrosion, mechanical damage and
other environmental impacts from the soil.
– Construction of the cables is more
complicated compared to the overhead cables
which are simple to construct, and do not
require insulation and sheathing.
protective casing or
covering
5. • Installation:
– The installation of overhead lines on poles is
easier and straightforward.
– However, the underground cables require
digging trenches and this may be complicated
by other utility service lines such as water
pipes, oil and gas pipelines, sewer lines.
– Other complications may arise due to rocks,
loose soil and water along the routes, making
them more expensive to install.
6. • Heat dissipation:
– Heat dissipation in underground cables is
limited by the layers of insulation and protection
such as armoring and sheaths.
– Most of the heat is therefore retained near the
cable unlike the overhead cables where most of
the heat is released to the surrounding and
automatic natural cooling is provided by the air.
automatic natural cooling is provided by the air.
• Size of Conductors:
– Underground cables have larger conductor
sizes compared to overhead lines for the same
amount of power.
– This is due to the fact that the overhead lines
have a natural cooling and hence the ability to
carry more power without heating up.
7. • Voltage carrying capacity:
– The overhead lines are better suited to carry
higher voltages compared to the underground
cables, which are limited by the expensive
construction and limited heat dissipation.
– For these reasons, the underground cables
are mostly used for transmitting up to 33KV.
• Fault detection and repair:
– It is easier to detect and repair faults in
overhead cables.
– It is more complicated and takes more time to
locate and repair the underground systems.
8. • Public safety:
– Underground cables are safer to the public,
animals and environment compared to the
overhead lines i.e. there are no issues such
as people getting in contact with fallen lines.
• Effect of lightning discharges:
– Overhead cables are more prone to lightning
– Overhead cables are more prone to lightning
strikes whereas the underground cables are
not affected by the discharges.
• Interference:
– Overhead lines interfere with communication
lines that are in close proximity, have corona
discharge, radio and TV interference which
does not happen with the underground lines.
9. • Land use
– The underground cables allow better use of
land coupled with better views without the
sight of poles and cables. This leads to
improved property values.
• Life expectancy
• Life expectancy
– Overhead lines have a longer life span
compared to undergrounds cables.
10. • Conclusion
– The underground cables are more expensive
to construct and install, however, they are
convenient, less likely to break and mostly
used to provide the missing link where
overhead cables cannot be used.
overhead cables cannot be used.
– The choice of the cable to use is determined
by the particular situation.
– The overhead lines are widely used due to
their cost and ability to carry more power
compared to the underground.
11. Sl. No Parameter Overhead Underground
1 Public Safety Not safe Safer than overhead system
2 Initial cost Less Expensive More Expensive
3 Flexibility More flexible Less flexible
COMPARISON BETWEEN OVERHEAD TRANS LINE AND UNDERGROUND CABLE
4 Working Voltage Can be operated for 400kv or higher Cannot be operated above 66kv
5 Maintenance cost High Very low
6
Frequency of
failure
More chance of fault Less chance of fault
11
12. Sl. No Parameter Overhead Underground
7
Frequency of
accident
Very High Very Low
8 Voltage drop High Low
9 Appearance Not so good Good Looking
COMPARISON BETWEEN OVERHEAD TRANS LINE AND UNDERGROUND CABLE
10
Fault location and
Repair
Easy to locate the fault Very difficult to locate the fault
11
Damage due to
lightening
Maximum Free from thunderstorm
12