Westinghouse choke coils

[Trade Journal]

Publication: Electrical Review

New York, NY, United States
vol. 46, no. 16, p. 670, col. 1-3


Westinghouse Choke Coils.

 

Lightning arresters are employed to relieve the line of abnormal rises of potential due chiefly to static disturbances, while it is the function of choke coils to prevent such disturbances from entering the apparatus whcih they protect. The choke coil operates on the prinicple that a coiled conductor presents a greater resistance to the passage of an electric current of high frequency than to one of relatively low frequency; therefore, though a coil may have a very slight resistance to direct current or to alternating current of from 3,000 to 7,200 alternations, its resistance to lightning discharges or other static disturbances, which always occur very suddenly, may be very great.