Date post: | 07-Apr-2018 |
Category: |
Documents |
Upload: | tummalaramesh |
View: | 224 times |
Download: | 1 times |
of 12
8/6/2019 29086669 Design of 400kv Transmission Line (2)
1/12
DESIGN OF 400KV
TRANSMISSION LINE
Promotive Infratech Pvt Ltd.
8/6/2019 29086669 Design of 400kv Transmission Line (2)
2/12
Contents
Abstract
Introduction
The problems associated with EHV-AC
transmission
Pccl substations in Andhra Pradesh
AP Transco 400KV substation
Design of a transmission line
Conclusion
8/6/2019 29086669 Design of 400kv Transmission Line (2)
3/12
ABSTRACT:
The transmission lines constitute the electric
power system. The availability of a well developed
high capacity system of transmission lines makes
it technically and economically feasible to
transmit large blocks of electrical energy over
large distances.
At transmission voltages of 132KV,230KV,choice
of conductor size is governed by the current
density and at higher voltages by voltage
gradients .
Procedure for the design of 400KV transmissionline is presented ,considering the corona
inception, radio interference level, audible noise,
shunt reactor compensation and switching over
voltages.
8/6/2019 29086669 Design of 400kv Transmission Line (2)
4/12
INTRODUCTION:
In present day power systems for economical transmission of large blocks
of power over long distances, it is necessary to go for higher and highertransmission voltages.
As per current terminology, voltages less than 300KV are termed as High
voltage, those between 300KV to 765KV are termed as extra high
voltage(EHV) and those greater than 765 KV are termed as ultra high
voltages(UHV).
In transmission system to choose the high voltage for transmitting a given
amount of power over a given distance economically, the number of factors
to be considered are ;
1.The cost of transmission line
2.Selection of power conductors
3. Tower dimensions
4.Compensatation of reactive power and
5.Cost of active power losses.
8/6/2019 29086669 Design of 400kv Transmission Line (2)
5/12
THE PROBLEMS ASSOCIATED WITH EHV ACTRANSMISSION:
1.Corona and radio interference:Corona is not only a source of power on transmission lines but also a
source of interference with radio and communications. The problem is moreacute when transmission of power is at EHV.
Bundled conductors offer an economical solution for minimizingcorona loss and radio interference for EHV lines.
2.Line support:EHV lines have large mechanical loading on towers due to bundied
conductors, large air and ground clearances.
The transmission line must therefore, be made more wind resistance.
3.Insulation Requirement:
The magnitude of likely voltage surges determines the required line
insulation level.In addition the recent trend is to go for HVDC transmission for
transfer of bulk amount of power over long distance.
8/6/2019 29086669 Design of 400kv Transmission Line (2)
6/12
Pccl substations in Andhra Pradesh
Ramagundam switching station(RSS)
Ganapoor(HYD)
Nagarjunsagar (Thallapally)
Guthi(Ananthapoor)
Kadapa
Khammam
Ramagundam switching station is under
control ofNTPC
8/6/2019 29086669 Design of 400kv Transmission Line (2)
7/12
AP Transco 400KV Substations
Mamidipally Kurnool
Vizag(Kalapaka)
Rajahmandri(Vemagiri)
Chittoor
Nellore
Mahbhoob Nagar
Dichpally(NZB)
Gajwel
All this substations are inter connect
with PCCL lines
8/6/2019 29086669 Design of 400kv Transmission Line (2)
8/12
DESIGN OF ATRANSMISSION LINE:
The necessary electrical design features are:
1.Choice of voltage
2.Selection of conductors
3.Spacing of conductors
4.Corona
5.Insulation design
6.Surge impedance loading of transmission line.
8/6/2019 29086669 Design of 400kv Transmission Line (2)
9/12
The necessary mechanical design features are:
1.Loading on transmission conductors
2.Span,sag and Tension
3.Sag-Tension relation
4.Effect of temperature
8/6/2019 29086669 Design of 400kv Transmission Line (2)
10/12
Transmission line designTransmission line design
The electric lines thatgenerate the most publicinterest are high-voltagetransmission lines.
These are the largest and
most visible electric lines.Most large cities requireseveral transmission linesfor reliable electricservice.
8/6/2019 29086669 Design of 400kv Transmission Line (2)
11/12
Conclusion
The silent features of a EHV transmission line are
presented in this work. The Electrical andMechanical
Design aspects of a 400KV Line are presented.
The effect of choice of voltage for transmission and the
performance of the line are discussed.
8/6/2019 29086669 Design of 400kv Transmission Line (2)
12/12
References
o Power system analysis and design
------ B.R. Gupta
o Electrical power systems
------ V.KMehtha
o Google
o Wikipedia