Are superconductors finally coming of age?

By Stephen Lacey, Editor
January 6, 2011 

Massachusetts -- Every technology must compete against an incumbent: Transistors fought vacuum tubes; optical fibers fought copper wires in communications; and today, superconductors are facing off against copper cables in the electricity transmission space. 

Superconductor technologies have made significant advancements in the last decade; however, there are still some hurdles to get over before they are implemented en masse.

At very low temperatures – between -320 degrees F (-196 C) and -460 degrees F (-273 C) – certain metal and ceramic materials conduct electricity with virtually no resistance. Wires made of these superconducting materials can transmit 100-150 times more electricity than traditional copper wires without any losses in efficiency. (Wires that operate in the -320 degree F range are called “high-temperature” superconductors, or HTS).

Scientists have known about superconductivity since the early 1900's. But it's only in recent years that companies have produced wires and cables that are becoming cost-competitive with traditional technologies.

Greg Yurek, CEO of American Superconductor (AMSC), thinks that the time is right for HTS technologies to penetrate the market. Last year, the company received an order for 10 million feet (3 million meters) of wire from the South Korean company LS Cable. This is the first in a series of orders that could bring more than 30 miles of superconductor cable to South Korea. The company expects numerous orders to come from China in the coming years as well.

“I think it's a marker of the transition into the age of superconductors,” says Yurek.

On a wire to wire basis, superconductors can cost multiples more than copper. But on the system level – when factoring in capacity, lifetime, efficiency and maintenance – Yurek says that superconducting cables are cost-competitive with conventional cables. And because they're buried underground, HTS cables avoid problems associated with weather or visual impact. ...

Are Superconductors Finally Coming of Age?

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Wireless power system shown off

By Jonathan Fildes, Technology reporter, BBC News, Oxford

A US firm has demonstrated its technique that sends power through the air, powering and charging devices wirelessly.

The technique exploits simple physics and can be used to charge a range of electronic devices over many metres.

Eric Giler, chief executive of US firm Witricity, showed mobile phones and televisions charging wirelessly at the TED Global conference in Oxford.

He said the system could replace the miles of expensive power cables and billions of disposable batteries.

"There is something like 40 billion disposable batteries built every year for power that, generally speaking, is used within a few inches or feet of where there is very inexpensive power," he said.

Trillions of dollars, he said, had also been invested building an infrastructure of wires "to get power from where it is created to where it is used."

"We love this stuff [electricity] so much," he said.

Mr Giler showed off a Google G1 phone and an Apple iPhone that could be charged using the system. …

Wireless power system shown off

Technorati Tags: power transmission