Identifier: electricrailway371911newy (find matches)
Title: Electric railway journal
Year: 1908 (1900s)
Authors:
Subjects: Electric railroads
Publisher: (New York) McGraw Hill Pub. Co
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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he tanks each••lement will have a capacity of 870 amp for 8 hours. 1740 ampfor 3 hours, 3480 amp for I hour, or 6960 amp for 20 minutes,and will be capable of withstanding discharges up to 11,000 amp. The battery installation is for the purpose of removing thefluctuations from the load and insuring a practically constantinput from the Detroit Edison Company. It consists of thebatterv, a motor-driven booster, an exciter set for the booster Fig. 8—Detroit Tunnel—Rectifier or Permutator Sets limit device is actuated by battery discharge current and battencharge current, and by booster voltage in a charge directionand in a discharge direction. When the battery is dischargingand this load-limit device is actuated, additional load is thrownon the motor-generator sets, and when the battery is chargingand the load-limit device is actuated the load is removed fromthe motor-generator sets, but this device, like the load-limitcontrol of the motor-generator sets, does not come into opera-
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io8 ELECTRIC RAILWAY JOURNAL. (Vol. XXXVII. No. 3. tion until certain limits have been reached. At all other timesthe regulating apparatus and the battery preserve practicallyconstant load on the lines from the Detroit Edison Company. It is thought that the following details of the apparatus maybe of interest: In the incoming lines from the Detroit EdisonCompany series transformers are inserted and. from these seriestransformers current is led to a small rectifier set which consistsof a synchronous motor and a small permutator. The syn-chronous motor drives the permutator in synchronism with thevoltage, but in a reverse direction to the direction of the fieldset up by the current from the series transformers. Thisresults in a field which is fixed in space so long as the powerfactor is unchanged. The permutator is provided with two setsof brushes, one practically at 90 electrical degrees to the other,one set being connected to the field of the counter machine andthe other set connected

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