Improvements in or Connected with Electrical Motor Transformers.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in or Connected with Electrical Motor Transformers.
I, ARTHUR BROMLEY HOLMES, of 36, Prince's Avenue, Prince's Road, Liver-
pool, in the County of Lancaster, Electrical Engineer, do hereby declare the
nature of this invention to be as follows:-
This invention relates to electrical transformers of the kind or type in which
an electrical motor, driven by current of higher pressure, supplied by a main
line or circuit from a generating station, drives a generator for generating
electricity of lower pressure, which supplies current to a circuit in which the
lower pressure is required; or vice versa.
In electric supply services, in which two or more compound wound motor
transformers are employed in a sub-station, or in separate sub-stations, any
excess of pressure in one or more of the generators of these transformers, is
liable to reverse the polarity of another. The chief object of the present in-
vention is to provide improvements in the generators of these transformers, by
which this reversal of polarity is prevented; and according to my invention,
the magnets of the generator are compound wound with the conductor of the
main line supplying the motors, by which the object named is attained.
1000
CHEESBROUGH & ROYSTON,
Applicant's Patent Agents, 15, Water Street; Liverpool.
COMPLETE SPECIFICATION.
Improvements in or Connected with Electrical Motor Transformers.
I, ARTHUR BROMLEY HOLMES, of 36, Prince's Avenue, Prince's Road, Liver-
pool, in the County of Lancaster, Electrical Engineer, do hereby declare the
nature of this invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:
This invention relates to electrical transformers of the kind or type in which
an electrical motor, driven by current of higher pressure, supplied by a main
line or circuit from a generating station, drives a generator for generating
electricity of lower pressure, which supplies current to a circuit in which the
lower pressure is required; or vice versa.
In electric supply services, in which two or more compound wound motor
transformers are employed in a sub-station, or in separate sub-stations, any.
excess of pressure in one or more of the generators of these transformers, is
liable to reverse the polarity of another. The chief object of the present in-

page_text: vention is to provide improvements in the generators of these transformers, by
which this reversal of polarity is prevented; and according to my invention,
the magnets of the generator are compound wound with the conductor of the
main line supplying the motors, by which the object named is attained.
In the annexed drawing, the application of the invention is illustrated
diagrammatically, shewing the main conductors conveying the main supply of
electricity of one tension, and a combined motor and dynamo transformed,
driven by, and governed by the main current from this source at a sub-generator
station, supplying current to lamps or other circuits at another tension.
In the main circuit, a represents the main electricity supply station; bis
the main feed or supply conductor for conveying current from a; and c is the
return conductor to the station a from the sub-station or stations. The dynamo
of the transformer is designated d and the motor e. The dynamo, as well as the
motor, are shunt wound, lines d' and representing the magnet windings,
respectively, of these two machines; but the magnets of d are compound wound
by and with the main supply circuit wire b, as indicated by the dark lines b¹,
and so that the current of the tension supplied from the main generator station
passes by this winding 61 of the sub-station dynamo magnets d, and thence to
the brush of the motor e connected with this dynamo. represents the com-
mutator of the motor and d is the commutator of the dynamo of the trans-
former, to the brushes of which, the lamp or other circuit f is connected.
With regard to the respective voltages employed in the main and sub-circuits,
these will be very various, and the invention does not depend in any way upon
.them.
:
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1. The herein described improvement connected with electrical motor trans-
formers of sub-stations of electricity supply, or in like conditions, namely,
effecting the prevention of the reversal of polarity of one or more of the genera-
tors of said transformers by compound winding the magnets of the generator
of said transformers with the conductor of the main line supplying the said
motor of the said transformer with current; substantially as set forth.
Dated this 26th day of June 1899
CHEESBROUGH & ROYSTON,
Applicant's Patent Agents, 15, Water Street, Liverpool.