Electrical Commissioning In Industrial Power Systems
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The Consolidated Edison utility pulled the plug on direct current service.
The change means that Con Ed now exclusively uses the alternating current system invented by Nikola Tesla. The utility is named for Edison, whose Pearl Street Station in Manhattan was the first U.S. central electrical power plant, serving 59 customers with direct current beginning in 1882.
In the so-called "war of currents," Edison feuded with Tesla and George Westinghouse over which transmission method to adopt — even going so far as to publicly electrocute animals in the hopes of showing AC was too dangerous.
Alternating current proved superior as transformers allowed electricity to travel over long-distance wires. As AC gained prevalence over DC across the world, Con Ed froze the development of the DC system in 1928 but continued to supply New York's major DC customers with the existing system.
In January 1998, Con Ed began to eliminate DC service. At that time, there were more than 4,600 DC customers. By last year, there were only 60.
Con Ed spokesman Robert McGee said some of the city's elevators still operate with DC using rectifiers that convert the utility's AC service.
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