IEEE Power & Energy Magazine - July/August 2020 - 85
* eight generators (plus two in reserve) rated
4,500 Vdc for transmission to Buffalo.
Local Distribution
There appears to be some ambiguity in the circuit
voltages and the voltages of the generators. What is
shown here is a best approximation to what was intended. There are four generators of 4,500 V and 24
generators of 500 V in each of two galleries.
Buffalo Transmission
Since there were eight 4,500-V generators, two per
circuit, there were four circuits feeding power to
Buffalo. Four generators were in one chamber and
four in the other. How any of the reserve machines
were to be connected is not mentioned.
Buffalo Receiving Station
The proposal states "at Buffalo the distribution circuits
are reconstituted by compensating machines." This was
a fairly common practice when four-circuit dc systems
were used. Even with the standard two-circuit Edison
three-wire system of higher power, a compensation machine would be used to balance the voltages.
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Plant Layout
In this project, the plant layout is quite different from
that of Project A. The generators are all located above
ground, one per turbine, in a "large horseshoe building.
The head-race enters between the wings forming the
sides of the horseshoe."
The layouts of the local and Buffalo circuits shown
here have been developed from the written descriptions taken from Adams' Niagara Power, Volume 1.
The arrangement of these circuits is logical from an
electrical circuit standpoint.
Circuit Configuration
We need to step back and look at what was being proposed here: a high-voltage, constant-potential dc system. For both local and Buffalo circuits, in either of
the projects, we have a large number of dc generators
connected in series. We don't, and never really did,
connect dc generators in series. There were isolated
(mostly traction application) incidents of series-connected generators connected in series with a feeder to
boost the voltage at a distant point. Also, when two
dc generators were connected in series in the Edison
three-wire system, there was a problem with voltage
distribution. If one of the circuits drew more current
than the other(s), then the voltage on that side would
be reduced. This decreased the voltage across that
generator's field, which in turn lessened that generator's armature voltage. Without some form of compensation, a large voltage imbalance would result.
july/august 2020
ieee power & energy magazine
85
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IEEE Power & Energy Magazine - July/August 2020
Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - July/August 2020
Contents
IEEE Power & Energy Magazine - July/August 2020 - Cover1
IEEE Power & Energy Magazine - July/August 2020 - Cover2
IEEE Power & Energy Magazine - July/August 2020 - Contents
IEEE Power & Energy Magazine - July/August 2020 - 2
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IEEE Power & Energy Magazine - July/August 2020 - Cover3
IEEE Power & Energy Magazine - July/August 2020 - Cover4
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