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Matthias, F. T. (ed.) / The Wisconsin engineer
Volume 33, Number V (February 1929)

Sogard, R. H.
New turbine generator installed at lakeside,   p. 162


Page 162


The WISCONSIN ENGINEER
New Turbine Generator Installed at Lakeside
                                              By R. H. SOGARD, m'25
                                The Milwaukee Electric Railway and Light
Company
GROWTH of the electrical system load in and around
G    Milwaukee required the installation of additional
generating capacity at Lakeside Station this year. The
demand indicated that it would be necessary to install
either two 30,000 kw. units, one in 1928 and one in 1929,
or one 60,000 kw. unit in 1928. Economic considerations,
both from the investment and coal consumption stand-
points, showed the 60,000 kw. single cylinder machine to
be the best.
  Under competitive bidding, the order for the turbine-
generator was placed with the Westinghouse Company,
and that for the condenser and extraction heaters with
the Foster Wheeler Com-
pany. The equipment was
ordered in December of last
year, and was started on
October 15. The unit was
tested for heat consumption
to check the guarantee, and
went into commercial ser-
vice on November first.
  The turbine proper has
two  impulse wheels and
twenty-two reaction wheels.
It has four extraction points,
and can heat its maximum
condensate flow (660,000
lb/hr.) to 360 degr. fahr.
It can also be operated with
giving a feed temperature of   FIG. 1: Placing the Turbine B
210 degr. to the open feed-        Unit, Lakeside Power Pla
water system of the station. The turbine has three steam
valves. With one valve open, a steam    flow  of 340,000
lb/hr. results, with a non-extracting load of 37,250 kw. or
an extracting load of 33,400 kw. With two valves open
and a throttle flow of 476,000 lb/hr., a non-extracting out-
put of 51,400 kw. and an extracting one of 45,600 kw.
are obtained.  The third valve is then opened to carry
further increases in load up to full capacity. The turbine
governor is of the impeller type, controlling the turbine
speed by oil pressure.
  The generator is a three-phase 60 cycle 1800 r.p.m.
machine, operating at 13,800 volts and 85 per cent power
factor. A 175 kw. 250 volt exciter is direct connected
to the end of the generator shaft. A closed type surface
air cooler serves the generator, the heat being absorbed
by the turbine condensate.
  The condenser is single-pass, with 55,000 sq. ft. of
surface. The tubes are rolled into both tube-sheets, one
of which is fixed and the other floating. Doing away with
packed tubes is expected to eliminate circulating water
leakage into the condensate.     An   integral air cooler is
provided, and air removal is effected by two element
steam jet air pumps.
  The turbine condensate passes first through the steam
jet air pumps, then through the generator air cooler, and
then in succession through four extraction heaters. Be-
tween the second and third heaters, a boiler feed pump
raises the water pressure to 375 pounds, so that it may
be heated to 360 degrees. After leaving the last heater,
                             the- high     nressu.qire  umim.s
raise it to 1450 pounds, for
feeding into the 1300 lb.
boiler.
  This 60,000 kw. turbine
will be tested by an actual
weighed water test at full
load. As far as is known,
this new water weighing
equipment is as large or
larger than any similar ap-
paratus installed in central
stations. Two tanks of 100,-
000 lb. capacity each are
set on Fairbanks beam reg-
istering scales. One tank will
take the full load throttle
no I      - a Tor1L /1_  I
Rot
nt
                             iiow or Co(U,Uuu iD/hr. bor
'or of the New 60,000 K. W.    ten minutes. Provisions are
Milwaukee, Wisconsin.       made for one man operation
of these huge weighing tanks.      Contrasted  with this,
the previous weighing tanks were of 5000 lb. capacity each,
and required at least three men for satisfactory operation.
  Most central stations that run steam consumption tests
on large turbines measure the condensate with some form
of meter. The Lakeside equipment is thus distinctive in
giving actual weighed results.  One percent on the heat
consumption of this machine would mean $6,900 per year
in coal, which capitalized at 8% represents a sum of
$86,300.
  At this time also a second 1200 lb. 7700 kw. turbine
is being installed. It will alternate in operation with the
first 1200 lb. machine. Next summer when the second
1300 lb. boiler is installed, both 1300 lb. boilers will
feed the new 1200 lb. 60,000 kw. turbine, and thus permit
a large part of the station generation to be made by the
economical high pressure section.
162
Volume 3 3, No. 5


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