[LINK] Ultra High Voltage
stephen at melbpc.org.au
stephen at melbpc.org.au
Wed Feb 20 00:58:58 EST 2008
Seems to me this invention will allow for the transmission of electricity,
economically, from geo-thermal fields in SA directly to nearly all Aussie.
For eg, today, "Geodynamics is pleased to announce the existence of good
quality temperature gradients following temperature logging on shallow
wells drilled in its Hunter Valley tenements.")
Leap Allows 2,000-Kilometer Link
Posted on: Sunday, 17 February 2008, By Sheble, Nicholas
In nations like Brazil, China, and India, governments face the challenge
of supplying densely populated urban centers with power from remote
generating stations in an efficient and environmentally responsible
manner. According to the American National Standards Institute (ANSI), a
new technology known as ultra-high voltage (UHV) offers a viable solution.
Delivering voltages of 1,000 kilovolt (kV) alternating current or higher
and a minimum of 800 kV direct current, UHV technology can carry large
quantities of electricity long distances.
It can do so over a single power line corridor and with minimal loss of
power. International standards for this emerging technology have yet to be
Indeed, ABB has already won orders worth $440 million from the State Grid
Corp. of China and other partners to provide new ultrahigh-voltage
technology for the world's longest power transmission link.
The power superhighway running 1,240 miles (2,000 kilometers) from
western China to the highly industrialized coastal area in the east will
have a capacity of 6,400 megawatts.
That is enough to meet the needs of about 31 million people in China,
based on average consumption per capital. The link from the Xiangjiaba
hydropower plant to Shanghai will be complete in 2011.
The ultrahigh-voltage direct current (UHVDC) link comprises two
substations and a power transmission system using breakthrough technology
to transmit electricity at ultrahigh voltage (800 kilovolts), which will
minimize the amount of power lost in transmission.
Increasing the voltage level of electrical transmission creates
considerable advantages for the environment, including lower electricity
losses and the use of less land compared to traditional overhead lines.
UHVDC is particularly suitable for vast countries like China, where the
centers that need power are often located far from power sources.
Transmission losses will be under 7%, significantly less than the losses
from conventional 500-kilovolt (kV) high-voltage direct current (HVDC)
The savings from using UHVDC compared with HVDC are equivalent to the
annual power consumption of more than 900,000 people in China.
The new technology, using thyristor valves equipped with newly developed 6-
in thyristors (power semiconductors) and an advanced control system,
allows the biggest capacity and efficiency leap in 20 years.
The increase became possible following advances in materials for outdoor
insulators and advanced control systems. Copyright Instrument Society of
America Feb 2008
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