. Electric railway journal . Substation Energy The bus construction in the substation is arrangedto care for the incoming line, oil switch, etc., for eachunit, grouping them together, and separating themfrom the compartments provided for the adjacentmachines. The incoming cables are No. 0000, grounded-neutral,11,000-volt, 60-cycle, alternating-current feeders. Dis-connect switches are installed in the alternating-cur-rent buses between adjacent groups so that an inter-change can be cut onto any line, or any line can bekilled. Under ordinary operating all incoming linesare paralleled. No protec
. Electric railway journal . Substation Energy The bus construction in the substation is arrangedto care for the incoming line, oil switch, etc., for eachunit, grouping them together, and separating themfrom the compartments provided for the adjacentmachines. The incoming cables are No. 0000, grounded-neutral,11,000-volt, 60-cycle, alternating-current feeders. Dis-connect switches are installed in the alternating-cur-rent buses between adjacent groups so that an inter-change can be cut onto any line, or any line can bekilled. Under ordinary operating all incoming linesare paralleled. No protection against surges is pro-vided from group to group, but the inverse-power relayon each line prevents the feeding back of energy intoany short-circuit from the bus. Protection is afforded the incoming alternating-cur-rent lines by inverse-power relays. These are essen-tially three single-phase watt-meters having each a ro-tating disk which tends to rotate against stops whenthe current is in the right direction. When any re-. DIRECT-CURRENT ENDS OF ROTARY CONVERTERS ANDFRONT OF MAIN CONTROL SWITCHBOARD versal of current takes place the disk rotates in theopposite direction and closes contact through a relaywhich opens the alternating-current oil switch. Thisgives protection to the cables between the substationand the lines of the generating company, a better pro-tection than would be provided by the ordinary over-load relay. The latter, in case of a short-circuit, wouldallow a very heavy current to build up before the over-load relays would operate. The reverse power relayoperates instantaneously with the reversal of power., The outgoing feeder cables leave the substationthrough a tunnel extending underneath the street toterminal poles on both sides. The cables are extended
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