. Electric railway journal . olts, and the lines of the Ameri-can Gas & Electric Company are operated at both 66,000and 130,000 volts. All lines leave the high-tension yardson the radial plan, with arrangements made for paralleloperation of two lines in case of emergency. It is under-stood, however, that radial operation is preferred andthat parallel operation is purely an emergency of the 11,000-volt feeders for the local industriesis equipped with a 3 per cent current-limiting reactorwhich was selected to limit the current which mightflow into a ground or short to a value well w
. Electric railway journal . olts, and the lines of the Ameri-can Gas & Electric Company are operated at both 66,000and 130,000 volts. All lines leave the high-tension yardson the radial plan, with arrangements made for paralleloperation of two lines in case of emergency. It is under-stood, however, that radial operation is preferred andthat parallel operation is purely an emergency of the 11,000-volt feeders for the local industriesis equipped with a 3 per cent current-limiting reactorwhich was selected to limit the current which mightflow into a ground or short to a value well withinthe rating of the smallest oil switch in the circuit. From the main 11,000-volt bus in each yard theenergy which is to be transmitted at 130,000 voltsleaves the yard from a 30,000-kw. bank of transformerswhich are tied in solid on the low-tension side. The11,000-volt switches in the lines supplying these trans-formers are located inside the power station and meetthe requirements of protection and control at the yard. FIG. 6—SOUTH END OF WINDSOR PLANT OPERATING ROOM as well. In the yard a high-tension transfer bus hasbeen installed, so that in case it is necessary to shutdown one bank of transformers the load from any out-going 130,000-volt line can be distributed over the re-maining good transformers. All the 66,000-volt and130,000-volt transformers are wound so that they maybe interchanged and the 66,000-volt units may also beoperated later at 130,000 volts. Further flexibility andassurance against interruption has been provided byinstalling lines for interconnecting the 66,000-volt busesin the yards of the two companies. In the American Gas & Electric Company yard, adouble 66,000-volt bus was installed. At present this isconnected to a 20,000-kva. bank of transformers andto all outgoing 66,000-volt lines. In the West Pennyard the 66,000-volt bus is operated normally only as atransfer bus, the energy being supplied by a 30, of transformers. All outgoing high
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