Are%20High%20Tension%20Power%20Lines%20Necessary? - PowerPoint PPT Presentation

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Are%20High%20Tension%20Power%20Lines%20Necessary?

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What are high powered tension lines? ... Power Transmission, Power distribution and use of electric power. – PowerPoint PPT presentation

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Title: Are%20High%20Tension%20Power%20Lines%20Necessary?


1
Are High Tension Power Lines Necessary?
  • JALEEL STERLING
  • ASHLEY CARLONI
  • DAVID BERNHART
  • ELIZABETH ANDERSON

2
What are high powered tension lines?
  • High powered tension is the bulk transfer of
    electrical energy, from generating power plants
    to electrical substations located near demand
    centers.

3
Types of transmission lines
  • Extra-high Voltage (230,000V and up)
  • More Efficient Fewer losses will occur in a
    higher voltage transmission line than a line with
    a lower voltage
  • Bundled conductors In higher voltage lines
    multiple wires can be hung from the same
    insulator, which increases the power carried by a
    single circuit
  • Sub-transmission lines (69,000V-161,000V)
  • Used to transmit electrical energy between
    stations located close to one another (less than
    100 miles apart)
  • Typically do not carry as much energy as
    extra-high voltage lines
  • Distribution lines (13,800V-34,500V)
  • Transmit energy to its end use
  • Commercial facilities, small factories, small
    house transformers

4
Map of high powered tension lines In the U.S.
5
Facts about high powered tension lines
  • Use of high voltage direct current (HVDC) to
    transmit large amounts of power from the
    generating station over long distances
  • Voltages vary from 138kV to 765kV
  • Radiate Powerful Electromagnetic fields (EMFs)
  • Electrical Field the part of the EMFs that can
    be shielded.
  • Magnetic Field the part of the EMFs that can
    penetrate stone, steel and human flesh.
  • Both fields are invisible and perfectly silent.

6
Viewpoint 1High Tension Power Lines are harmful
humans and the environment
7
Negatives of high powered tension lines
  • High powered lines form (EMF) Electric and
    Magnetic fields
  • EMF occur naturally and as a result of the Power
    generation, Power Transmission, Power
    distribution and use of electric power.
  • EMF is fields of force and is created by electric
    voltage and current. They occur around electrical
    devices or whenever power lines are energized
  • Magnetic fields result from the motion of the
    electric charge or current, such as when there is
    current flowing through a power line or when an
    appliance is plugged in and turned on. Appliances
    which are plugged in but not turned on do not
    produce magnetic fields.

8
EMF Effects Human beings
  • Short Term Health Problem
  • Long term Health Problem
  • Headaches
  • Fatigue
  • Anxiety
  • Insomnia
  • Prickling and/or burning skin
  • Rashes
  • Muscle pain
  • Risk of damaging DNA
  • Risk of Cancer
  • Risk of leukemia
  • Risk of Neurodegenerative disease
  • Risk of Miscarriage

9
How EMF effects you by distance
10
Negative Statistics
  • From the British Medical Journal Researchers
    found the children living within 650 feet of
    power lines had a 70 risk for leukemia than
    children living 2,000 feet away or more.
  • From Epidemiology Several studies have
    identified occupational exposure to EMFs as a
    potential risk factor for neurodegenerative
    diseases
  • From Epidemiology There is strong prospective
    evidence tat prenatal magnetic exposure may be
    associated with miscarriage risk.
  • From the Internal Medicine Journal People who
    lived within 328 yards of a power line up to age
    5 were five times more likely o develop cancer as
    an adult. People who lived within 328 yards of a
    power line up to age 15 were three times more
    likely to develop cancer as an adult.

11
EMF Effects on Agricultural lands and farms
  • Transmission lines can affect farm operations and
    increase cost.
  • Most impact depends om the line design.
  • Transmission lines can affect
  • Field operations
  • Irrigation
  • Aerial spraying
  • Wind breaks
  • Hinder future consolidation of farm fields or
    subdividing land for residential development.

12
Viewpoint 2High Tension Power Lines are more
efficient and not proven to be harmful
13
There is no real evidence to support the
causation of cancer
  • Scientists that claim the EMFs from high tension
    power lines cause cancer have found correlations
    but no true evidence to prove that living near
    these transmission lines actually causes cancer
  • Many studies contradict each other
  • This is likely to be a long-term disagreement
    between scientists with no real conclusion in the
    near future

14
Lower Radiation Frequency than household
appliances
15
Efficiency
  • Wires on more efficient high-voltage power lines
    do not get as hot, which results in substantially
    lower electricity losses in the process of moving
    power into communities.
  • Lower losses between generation sources and load
    centers mean a reduction in the required
    electricity output needed to transport power and
    meet demand.

16

Efficiency Chart
17
Our ViewpointHigh Tension Power Lines are
necessary!
18
Why high tension power lines are necessary
  • High demand for electrical energy
  • Without them, generation would have to take place
    near or where the energy is used
  • Low voltage power lines result in great losses
    during transmission
  • High tension power lines transport large amounts
    of electrical power over long distances

19
.Our Opinion
  • Burying High Voltage Power Lines
  • When compared to overhead high voltage power
    lines, underground lines are
  • Safer
  • More friendly on the environment
  • More Reliable
  • More efficient
  • More cost effective
  • And have less impact on
  • Health
  • Property devaluation

20
Sources
  • http//www.eia.gov/todayinenergy/detail.cfm?id893
    0
  • http//www.iject.org/vol4/spl1/c0047.pdf
  • http//www.bpa.gov/news/pubs/GeneralPublications/l
    usi-Power-lines-and-crops-can-be-good-neighbors.pd
    f
  • http//psc.wi.gov/thelibrary/publications/electric
    /electric10.pdf
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