. Electric traction and transmission engineering . nergy losses attendant uponthe use of the battery. Furthermore, the cost of extraattendance entailed by the use of batteries must be consid-ered. The proper capacity of such a battery is so closelydependent upon the characteristics of the substation loaddiagram that the advisability of its installation can bedetermined only from the study of the specific case. 65. Arrangement of Apparatus. — The arrangement ofapparatus in a substation is governed to some extent bythe cha-racter of the equipment and the size and shape ofthe available site. It i
. Electric traction and transmission engineering . nergy losses attendant uponthe use of the battery. Furthermore, the cost of extraattendance entailed by the use of batteries must be consid-ered. The proper capacity of such a battery is so closelydependent upon the characteristics of the substation loaddiagram that the advisability of its installation can bedetermined only from the study of the specific case. 65. Arrangement of Apparatus. — The arrangement ofapparatus in a substation is governed to some extent bythe cha-racter of the equipment and the size and shape ofthe available site. It is desirable to have all apparatuson one floor; but, if the equipment be large, the switchgear should be placed on a gallery so that the attendantmay command a view of the whole station. In urbandistricts, where real estate is expensive, the transformers,high-tension switches, and lightning arresters are oftenplaced on a second floor. Storage batteries when usedin substations are usually located on another floor or 190 TRACTION AND |.xp^\^\^v^^^^
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