Improvements in Generators for Use in Systems of Electrical Distribution.
Year: 1898

page_text: Date of Application, 14th June, 1898-Accepted, 8th Oct., 1898
COMPLETE SPECIFICATION.
Improvements in Generators for Use in Systems of Electrical
Distribution.
We, THE BRITISH THOMSON-HOUSTON COMPANY, LIMITED, of 83, Cannon Street,
in the City of London, Electrical Engineers, do hereby declare the nature of this
invention (which has been communicated to us from abroad by Charles P.
Steinmetz, residing at Schenectady, County of Schenectady, State of New York,
United States of America, Electrical Engineer), and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement:-
The present invention relates to generators for use in systems of electrical
distribution, whereby light and power may be efficiently and economically supplied
from the same generator.
The invention will first be fully described in connection with the annexed
diagrammatic drawing and then specifically pointed out in the claim.
In the drawing, G is a monocyclic generator, having its field winding, F,
supplied with current from the exciter, E, through the controlling rheostat S,
as usual.
The induced member is wound with the main winding C and with the auxiliary
winding C¹ connected at one end to an intermediate point in the main winding.
The winding C¹ is so mounted on the induced member as to be the seat of an
electromotive force displaced from the electromotive force of the main winding.
The terminals of the main armature winding C are connected to the rings R, R¹,
while the terminal of the auxiliary winding C, which is connected to the inter-
mediate point in the main winding C, is also connected to the ring R³. The other
terminal of the coil C is connected to the coil R2. From the rings R, R², R³
and R lead wires, numbered 1, 4, 2, 3, respectively, to the distribution system.
It will be seen that the wires 1; 2, 3, form a three-wire, single-phase system,
of which 2 is the neutral wire and 1 and 3 are the outside wires. Lamps L, L,
may therefore be placed on the three-wire system in the usual manner, and other
lamps L, L, L, may be placed in the secondaries of the transformers T2, T3, or
across the compensator T4, connected to the three-wire system. It will be noticed
that the primary of the transformer T2 is shown as being connected across one
side of the three-wire system, namely, between the wires 1 and 2, while the
primary of the transformer T3 is connected across the other side of the three-wire
system, between the wires 2 and 3. The compensator T is a three-wire com-
pensator, connected to all three of the mains of the three-wire system. It will
be seen that the present invention attains all the economy
characteristic
of the three-wire system of distribution.
'
of
copper
The fourth, or supplementary wire, 4, is obviously the seat of an electromotive
force displaced in phase from the electromotive force of the three-wire system,
and may, therefore, be used, in connection with either two of the wires of the
three-wire system, for running motors or other multiphase devices.

page_text: It is to be assumed that the generator G is so proportioned that there is a
difference of phase of substantially 60° between the main 4 and the mains 1
and 3, as in the case with the monocyclic generators now in use. The trans-
former T is connected across the mains 1, 3, while one terminal of the trans-
former T is connected to an intermediate point in the primary of the
transformer T, while its other terminal is connected to the main 4. The secon-
daries of these transformers are so arranged that a difference of phase of 120°,
suitable for driving a three-phase motor M, exists between the electromotive
forces of the mains 5, 6, 7.
It will be seen that by the present improvements it is possible to gain, in a
single system, the advantage of the monocyclic system of distribution, and of
the three-wire system of distribution.
Having now particularly described and ascertained the nature of our said inven-
tion (as communicated to us from abroad), and in what manner the same is to
be performed, we declare that what we claim is:-
A dynamo-electric machine, having out-of-phase coils, connected to three
collector rings, and the remaining terminal of one coil connected to an inter-
mediate point in the second coil, and a fourth collector ring likewise connected
to the intermediate point in the last-named coil.
1000.
THE BRITISH
THOMSON-HOUSTON CO. LTD.
W. MARTINDALE, \
T. R. THOMPSON,
ALFRED CLEMENTS,
Directors.
Assistant Secretary.