File:Marconi Company's power-house and aerials at Bolinas, California.jpg

Identifier: pacificgaselectr61915paci (find matches)
Title: Pacific Gas and Electric magazine
Year: 1909 (1900s)
Authors: Pacific Gas and Electric Company
Subjects: Pacific Gas and Electric Company Electric utilities Public utilities
Publisher: (San Francisco, Calif.) : Pacific Gas and Electric Co.
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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Text Appearing Before Image:
s,air compressor motors, blower motors,fan motors, and the motors driving .\Cgenerator sets furnishing power for theoperation of the signaling circuits, all ofinduction motor drive. The current supplied by the frequencychangers is again stepped up through livetransformers of special design, one beingheld in leserve. All of llie above units are in pairs, al-lowing one conqdele frequency changerand set of auxiliaries to remain in re-serve. .Ml units arc each interchange-able. The switching arrangements allowany transformer to be cut out on bothhigh and low sides, the step-down Irans-foriiiers being connected to the 11,(1(1(1-volt feeder line through remote conlrcdoil-switches placed in vaults undernealbthe switchl)oai-d gallery. The high voltage circuit cliarges a largecondenser which, in turn, dischargestwice i)er cycle Ihrough 21-incli widecopper strip buses acro.ss the spark gap.located in a sound-proof vault. ■file coin;)i-essois Mippl\ air tor cooling 144 Pacific Service Magazine
Text Appearing After Image:
Marconi Company's power-house and aerials at Bolinas, California and regulating the discharge, ventilationbeing supplied with fans. The con-denser discharges in series with an in-ductance, constituting the primary of anoscillation transformer, the secondary ofwhich is connected directly to the aerial-earth system through two regulating coils. Eight 300-foot tubular steel masts sup-port a 32-wire rectangular antenna about2(100 feet long and 600 feet wide. Direct-ly below this is an elaborate groundsystem of 32 wires besides an earth plateburied in the ocean below the low-waterlevel. Signalling is done manually or auto-matically, at either Marshall or Bolinas,and the arrangement makes it possible tooperate the transmitter at very highspeed. A small benchboard contains the instruments and switches controlling theautomatic circuits. Lightning protectionis aflorded by four disconnecting andgrounding switches located in the incom-ing aerial line. Lighting and small power for the en-tire plant is steppe

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