. Electric railway journal . the lightning-protection devices, the com-pressor which supplies the brake cylinders, sanders, signalpipes and the cylinders through which the pressure of thepantographs against the trolley wire is regulated; also amotor-generator lighting set, storage batteries and the The protection against lightning and other high-tensiondischarges consists of a horn arrester which is placed onthe car roof and grounded to a 2900-ohm, oil-immersedresistance, which consists of forty-eight pieces of car-borundum. A choke coil is placed in the high-tension cir- 646 ELECTRIC RAILWAY
. Electric railway journal . the lightning-protection devices, the com-pressor which supplies the brake cylinders, sanders, signalpipes and the cylinders through which the pressure of thepantographs against the trolley wire is regulated; also amotor-generator lighting set, storage batteries and the The protection against lightning and other high-tensiondischarges consists of a horn arrester which is placed onthe car roof and grounded to a 2900-ohm, oil-immersedresistance, which consists of forty-eight pieces of car-borundum. A choke coil is placed in the high-tension cir- 646 ELECTRIC RAILWAY JOURNAL. [Vol. XXXVIII, No. 15. cuit just before the entrance to the high-tension chamber. The high-tension oil switches open and close the circuitto the car transformer. These interruptions are made atfour places on account of the high voltage. These switcbesare controlled from the motormans stand by means of aswitch-in coil, although they could be operated by hand inemergencies. They are so constructed that a high-tension. Spiez-Frutigen Railway—Main Transformer resistance is kept in circuit temporarily to prevent the im-mediate application of full voltage on the high-tension switches are cut out of circuit by meansof a relay which is actuated through a push button at themotormans stand. All high-tension apparatus is placed in a separate com-partment under the middle of the car body. The mica-insulated high-tension circuits are led to this compartmentfrom the roof via the toilet room through a grounded brasspipe which is filled with cable insulation. The high-tensioncompartment can be opened only when all high-tension cir-cuits are opened, and the pantograpbs cannot be raisedwhile the door of this compartment is open. The transformers are of the oil-insulated, core type withan hour rating of 450 kva. They are mounted under thecar to obtain the benefit of air cooling during running. Ifnecessary, the primary or high-tension winding can beoperated at 7500 volt
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