. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . llO-YolfLiqh+inqCircuit ConfaCTS ^m •SignalLamps Contactor atHeacfworks causes the relay tooperate and close theshunt trip coils of thecircuit breakers. Sincethe circuit breakersboth open simultan-eously the faultygroup of transformers is completely isolated, and the continuity of the system is not Water Level Indicator.—At the Falls Village (Conn.) hydro-electric plant of the Connectic
. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . llO-YolfLiqh+inqCircuit ConfaCTS ^m •SignalLamps Contactor atHeacfworks causes the relay tooperate and close theshunt trip coils of thecircuit breakers. Sincethe circuit breakersboth open simultan-eously the faultygroup of transformers is completely isolated, and the continuity of the system is not Water Level Indicator.—At the Falls Village (Conn.) hydro-electric plant of the Connecticut Power Company the crest of the canalbetween the pond and forebay is 9 ft. below the pond level. In order Pinion Meshingwith Oatg Rack 186.—Construction and Electrical ConnectionsHead-Gate Movement Indicator of fk# <-Slafe i\ MefafPlahs i t< I Sirip 5x6 6o//Iron Elec+rode Immer&edin Forebay S/ah SfripsfasiemdioWooden Sfnps ..Mei-alPlafefasfenedioSlate Sfnps ••••■ MeialPfafe■fasienedtoy^ooden Strips■ Wooden Strips Hantiole ■Communi-catinq wdhForebay. High-Limit. LampSTATION Light I Loyv-LimitLamp Levelmtti Water Floirina■over Canal Spillwau -^■Limits within whichLevel is Normallu Maintained L owes t Level Permitted Elec+rical Connec+ions betweenImmersed Con+acts and SignalLamps Fig. 187.—Arrangement of Electrodes in Forebay by Indicate Level by Signals carefully to regulate the openings of the headworks gates with fluctuations inturbine loads so that no water is wasted over the canal spillway, ingenioussignaling devices are used. One arrangement shown in Fig. 186 indicatesthe amount the headgates are moved and the other shown in Fig. 187whether the canal level is too low or high. 332 HYDROELECTRIC PRACTICE As shown in Fig. 186 the gate-movement indicator consists of a pivotedstrip of wood carrying two connected spring contacts and held in a per-pendicular position by springs. The lower end of this wooden strip en-gages with one of
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkmcgrawhillb
