The Ely miner. [volume] (Ely, Minn.) 1895-1986, 1923-11-30

exciters on account of the low speed
of 12O RPM. Separate exciters
will be furnished, driven by vertical
water wheels, while motor gen
orator exeter set will be provided
for emergency use. The generators
are being furnished by the General
Electric Company, the turbines by
the Wellman Seaver-M Morgan Com
pany. The static head here will
vary between " feet and II
feet, the draw down being avail
able to supply added cavacity dur
ing peak load periods. The units
are the result of comparatively
new development and are known
as the umbrella type" In this
type the Kingsbury thrust bearing
is placed below the generators, in
stead of above as is usual. This
not only prevents any oil vapor
from being drawn through the wind
ings, but also places all equipment
which requires inspection accessible
to the turbine deck. On this deck
are located not only the governors,
and exciters, but also in an adjacent
room the switchboard and low ten
sion oil circuit breakers and buses.
By so locating the various pieces of
apparatus, it is unnecessary for the
attendant to leave this floor to make
any inspection. The station hous-
ing the generators, exciters, switch
board, low tension oil circuit break
ers, buses, etc., will be of the steel
reinforced type having floor dimen-
sions of SO feet long by So feet
wide. A single steel penstock 18
feet in diameter and 295 feet long
will be installed at present with pro-
vision for second at the time of
installing the second generator unit.
AS at Winton, a high tension
switchyard will be provided contain
ing ultimately four 1900 KVA
water cooled, 8 phase transformers
stepping up to 10000 volts. These
will connect to the transmission line
now being built to the Thomson
Hydro-Electric Plant of the Great
Northern Power Company.
While the above two plants will
provide 10000 KVA added general
ing capacity as being constructed at
present, and 10000 KVA ultimately,
in order to make them of greatest
value to the power consumers on
the Ranges it will be necessary also
to increase the capacity of the trans
mission lines to the load centers.
Improve Service on the Mesabi.
At present the Mesabi Range OBJ
tains power from the Thomson
Hydro-Plant over one $4,000 volt
line terminating at Hibbing. Here,
connection is made through a 5000
KVA bank of step down transform
ers to the $4,000 volt lines running
across the Range from Biwabik to
Deer River. Power is also obtained
from two steam plants having a
total capacity of 10000 KVA locat-
ed at Virginia and Chisholm. In
order to improve service two addi-
tional transmission lines operating
at 10000 volts are being built, one
from Thomson to new substation,
Just east of Nashwauk, and one
from the Winton Plant to new
substation at West Side, Virginia.
At both these points the lines will
connect through step down trans
formers to the $4,000 volt lines.
Each line will have capacity of
10000 KVA at present. which CAP
acity can be increased to 10000
KVA by the installation of synchron-
Gus condensers at the substations.
The wood pole "H" frame type of
construction is being used on the
10000 volt lines. This consists of
two 55 #. cedar poles, butt treated,
to which are attached % fit. fir
crossarm. Insulators consisting of
seven discs per string suspend the
40 stranded copper conductors in
horizontal plane beneath the cross
arm, giving spacing of II feet be-
tween conductors. The normal span
between structures is $50 feet but