. Electric traction and transmission engineering . Fl£ SUBSTATIONS. 193 Fig. 81 gives a view of the low-tension end of one of thesubstations of this road, the reactances surmounted bystarting panels being shown as located in front of theirrespective converters. Fig. 82 shows the method of tapping. Fig. 84. the transmission line on the substation roof, and shows thehigh-tension roof bushings for insulating the supply wiresat their points of entrance to the substation. Figs. 83and 84 respectively show the electrolytic lightning arrestersand the high-tension oil switches and the methods em-ployed
. Electric traction and transmission engineering . Fl£ SUBSTATIONS. 193 Fig. 81 gives a view of the low-tension end of one of thesubstations of this road, the reactances surmounted bystarting panels being shown as located in front of theirrespective converters. Fig. 82 shows the method of tapping. Fig. 84. the transmission line on the substation roof, and shows thehigh-tension roof bushings for insulating the supply wiresat their points of entrance to the substation. Figs. 83and 84 respectively show the electrolytic lightning arrestersand the high-tension oil switches and the methods em-ployed in their installation. 66. Portable Substations. — On most electric roadsthere are certain sections of the line on which abnormally 194 TRACTION AND TRANSMISSION. heavy traffic must be handled at infrequent intervals oronly during a certain portion of the year, as for instancenear fairgrounds, parks, or summer resorts. To meet sucha condition 0,nd to guard against interruption of servicedue to accident to a unit in any substation, it is muchcheaper to make use of portable substations than to in-stall permanent spare units. These substations consistof specially arranged cars containing complete substationequipments, of the converter or motor-generator type,with accessories. The standards
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