The diagram on page 93 illustrates the essential
features of the organization and connections of the 11,000 volt
circuits in the power house.
[Illustration: MANHOLES IN SIDE WALL OF SUBWAY]
Any and every switch can be opened or closed at will by the operator
standing at the control board described. The alternator switches are
provided also with automatic overload and reversed current relays, and
the feeder switches, as above mentioned, are provided with automatic
overload relays. These overload relays have a time attachment which
can be set to open the switch at the expiration of a predetermined
time ranging from .3 of a second to 5 seconds.
[Illustration: CONVERTER FLOOR PLAN
SUB-STATION NO. 14]
The type H-oil switch is operated by an electric motor through the
intervention of a mechanism comprising powerful springs which open and
close the switch with great speed. This switch when opened introduces
in each of the three sides of the circuit two breaks which are in
series with each other. Each side of the circuit is separated from the
others by its location in an enclosed compartment, the walls of which
are brick and soapstone. The general construction of the switch is
illustrated by the photograph on page 94.
[Illustration: CROSS SECTION SUB-STATION NO. 14]
[Illustration: INTERIOR OF SUB-STATION NO. 11]
[Illustration: LONGITUDINAL SECTION SUB-STATION NO. 14]
Like all current-carrying parts of the switches, the bus bars are
enclosed in separate compartments.
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