. The Street railway journal . ove,without the sacrifice of efficiency which would accompany theuse of other commercial gears on the same service. CHOKE COILS Lightning arresters are employed to relieve the line of abnor-n>al rises of potential due chiefly to static disturbances, whileit is the function of choke coils to prevent such disturbancesfrom entering the apparatus which they protect. The chokecoil operates on the principle that a coiled conductor presentsa greater resistance to the passage of an electric current of highfrequency than to one of relatively low frequency; therefore,th
. The Street railway journal . ove,without the sacrifice of efficiency which would accompany theuse of other commercial gears on the same service. CHOKE COILS Lightning arresters are employed to relieve the line of abnor-n>al rises of potential due chiefly to static disturbances, whileit is the function of choke coils to prevent such disturbancesfrom entering the apparatus which they protect. The chokecoil operates on the principle that a coiled conductor presentsa greater resistance to the passage of an electric current of highfrequency than to one of relatively low frequency; therefore,though a coil may have a very slight resistance to direct cur-rent or to alternating current of from 3000 to 7300 alternations,its resistance to lightning discharges or other static disturb-ances, which always occur very suddenly, may l)e very great. In order that the choke coil may perform its duty success-fully, very great care must be exercised both in its construc-tion and in its installation. The Westinghouse Electric &.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
