[Electric engineering.] . are used for telephone or telegraphwork. It is provided with two petticoats, or flanges, a, bover which leakage must take place before the current cani. III.—8 6 ELECTRIC TRANSMISSION. leak from the wire to the pin. The use of a number ofpetticoats increases the leakage distance and provides ahigh insulation. Insulators used on high-tension lines areprovided with a number of such petticoats. When heavycables are used, it is customary to carry them on especiallyheavy insulators and to tie down the cable on top of theinsulator instead of tying it to the side. Fig. 3
[Electric engineering.] . are used for telephone or telegraphwork. It is provided with two petticoats, or flanges, a, bover which leakage must take place before the current cani. III.—8 6 ELECTRIC TRANSMISSION. leak from the wire to the pin. The use of a number ofpetticoats increases the leakage distance and provides ahigh insulation. Insulators used on high-tension lines areprovided with a number of such petticoats. When heavycables are used, it is customary to carry them on especiallyheavy insulators and to tie down the cable on top of theinsulator instead of tying it to the side. Fig. 3 shows acommon type of such insulator. The cable rests in thegroove a and is held in place by a tie-wire twisted aroundthe cable and passing under the ears at b, c. Good qualityglass insulators, such as those just described, may be usedfor any lines where the potential is not over 2,000 or 3,000volts. For higher pressures on transmission lines, it is betterto use a larger insulator giving a higher degree of
Size: 1729px × 1445px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidelectricengi, bookyear1902
