. The street railway review . ltnCiiXKIi TrllHINI-: ANt> Hill STATION. CAPACITY. KW. (JKNIOUATOIIS AND ]2,niKI KW. TIIIC<II<;|| ANIi TUilUlNt; ) TIlllOl lill UOTAUY IIOOM. C78 DAILY STREET RAILWAY REVIEW. [Serial No—Vou XIII, No 8 d. where altoriintliig current at n pressure of (5,000 volta or lilglierla carried uii overhead wires strung along city streets, butalthuugli <iulte u sum of money is saved In the Initial cost offeeders, the true economy of such iin Installation Is doubtful.•Serious Inlerruptious to trnllic and pe
. The street railway review . ltnCiiXKIi TrllHINI-: ANt> Hill STATION. CAPACITY. KW. (JKNIOUATOIIS AND ]2,niKI KW. TIIIC<II<;|| ANIi TUilUlNt; ) TIlllOl lill UOTAUY IIOOM. C78 DAILY STREET RAILWAY REVIEW. [Serial No—Vou XIII, No 8 d. where altoriintliig current at n pressure of (5,000 volta or lilglierla carried uii overhead wires strung along city streets, butalthuugli <iulte u sum of money is saved In the Initial cost offeeders, the true economy of such iin Installation Is doubtful.•Serious Inlerruptious to trnllic and perhaps Injury to the centralslallou and substation inariiinery uvf Invlliil by short circuitsaud grounds from fires, storms. Uiriilnlut; and acciileulal crosseswith other wires, while the danger to liuman life is such thatthe railway company is lialiie al any lime on account of somefatality to bo ordered to place the high tension wires under-ground at a greater exisnse llian if It hail been lione in llie be deterudneil very simi)ly by dividing the watts to be trang-nillled by tlie transudsslon voltage multiplied by the squareroot of three. Tile cross-sections of the coj)per may be taken very conserv-ali\ely al ) circular ndls per ampere for rubber lusulaleili-ables and !HHI circular ndls per ampere for paper Insulatedcables. The copper cross-section should be checked by estimat-ing the drop in voltage at mnximum load, but for the compara-tively short instances of city work it will usually be found thattile drop in voltage Is very small In a cable properly iiroporlionedfor tile current It Is to carry. The largest si/.c three-conductor
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
