Title: Are%20High%20Tension%20Power%20Lines%20Necessary?
1Are High Tension Power Lines Necessary?
- JALEEL STERLING
- ASHLEY CARLONI
- DAVID BERNHART
- ELIZABETH ANDERSON
2What 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.
3Types 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
4Map of high powered tension lines In the U.S.
5Facts 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.
6Viewpoint 1High Tension Power Lines are harmful
humans and the environment
7Negatives 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.
8EMF Effects Human beings
- Short 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
9How EMF effects you by distance
10Negative 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.
11EMF 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.
12Viewpoint 2High Tension Power Lines are more
efficient and not proven to be harmful
13There 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
14Lower Radiation Frequency than household
appliances
15Efficiency
- 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.
16Efficiency Chart
17Our ViewpointHigh Tension Power Lines are
necessary!
18Why 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
20Sources
- 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