Year: 1889

page_text: to Apparatus therefor.
1, HENRY HARRIS LAKE of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings, in the County of Middlesex, 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:-
-
The present invention relates to a system of electric distribution by means of
alternating currents, in which high potential currents from a generator are
carried by a line to converters or transformers and are there changed to currents of
lower electro motive force and greater volume.
The said invention consists in the system of electric distribution hereinafter described
and comprising alternating current mains leading from a point of alternating current
supply, converters or transformers of the ordinary description connected to said mains
at any convenient or desired points, leading wires or mains connected to the secondaries
of said converters, one or more induction transfer coils connected across said mains,
and three or more sub-circuits or distributing wires connected to the transfer coils each two
sub-circuits having a fraction of the transfer coils included between them as shown in.
Letters Patent of the United States of America No. 360,125 and as hereinafter
indicated. The sub-circuits or distributing wires running out from the transfer coils
may supply incandescent lamps or other translating devices connected between pairs
of wires, or may include other transfer coils to which in turn the translating devices
may connect by wires including a fraction of the winding of each coil, the sub-division
of the circuits being carried out by means of the transfer coils to any desired extent
and the circuit subdivided on the final transfer coil supplying the translating devices
such as lamps.
The said invention is illustrated in the accompanying drawing in which A represents
an alternating current dynamo generator, of which FF2 are the field poles, excited,
it may be from any external source, or by a separate winding on its own armature.
B B indicates the brushes bearing on the collector rings of the machine and a, b the
mains leading to the translating devices situated on the external circuit. Such current
using devices are represented at TT, which are converters or transformers of any

page_text: pattern for reducing the high potential current on the mains a, b to low potential
currents of large volume in the secondary lines c,
d and e, f.
Connected in multiple across the mains c, d and e, f etc. are a number of induction
transfer coils I, 1, 1 etc. lamps L, L etc. having connections to the mains
and to an intermediate wire leading to an intermediate portion of the coil.
The coils I, I, I etc. are not transformers in the usual sense of the term,
but are properly equalizers for potential difference or variation existing on the
different lamp circuits or wires to which the groups of lamps L and L' are connected.
The coils I are each simply coils of wire wound in the same direction on a suitable
iron core, and have a high self induction which normally tends to cause them to set
up a counter electro motive force tending to oppose the passage. of currents through
them. Each group of lights or other devices has its wires connected to the coils 11
so as to include a number of said coils between them, the number depending upon
the normal potential between the wires.
Should lamps be extinguished in the group L for instance the full number running
in the group L, both being supplied with current from same mains, the lesser number
of lamps would tend to run at an increased brilliancy but the action of the coil I now
asserts itself to equalize or tend to restore the potential in the different branches or
groups so as to prevent any appreciable diminution of brilliancy in the group which
remains unchanged in number or any increase of brilliancy in the group diminished
in number.
In this action the portion of coil in multiple with the lessened number receives
more current from the main circuit and acts as the primary of an induction coil while
the portion of coil in multiple with the lamps whose brilliancy tends to diminish acts
as the secondary of the said coil and delivers energy to such lamps to tend to keep-
up their brilliancy.
By the present invention greater flexibility of distribution is secured with greater
economy, than is at present obtained by the use of either transformers or induction
transfer coils alone. This is indicated in the Figure where a current with as high a
potential as 1000 volts may exist between the primary mains a, leading from the
alternating current generator A which current when it reaches the transformers T T
is converted into a current having a potential of, say, 220 volts on the secondary
mains c, d, e, f. This current is in turn fed to induction transfer coils I, I, I" etc.
from which coils, lamps, motors, or other electric apparatus suitable for use with alternating
currents may be supplied with current of any desired potential as great as or lower
than 220 volts without further conversion.
Suitable fuses for safety in cases of short circuit should be placed in the mains
leading to and from the transformers T, T' and in the circuits leading to and fromthe
induction transfer coils 1, I' etc. as usual.
It will be understood from the foregoing that the subdivision or potential may be
carried even to a further extent than is indicated in the drawings it being only
necessary to extend the principle of supplying transfer coils from fractions or preceding
transfer coils in the trains of subdivision of potential and from the final coil to supply
the translating devices.
It will further be seen from the diagram that the subdivision indicated may be
carried out as at 11, through the wires leading from one fraction of the first
coil of the series leaving the other fraction or fractions for the supply of currents
of higher-potential to translating devices L or that the subdivision may be carried
out through all the wires connected to the first coil of the system and may stop at
different points in the trains of subdivision.
Having now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed as communicated to me by my foreign
correspondent I declare that what I claim is :-
First. The herein described system of electrical distribution comprising alternating
current mains leading from a point of alternating current supply one or more
converters or transformers of the ordinary description connected to said mains, leading

page_text: wires or mains connected with the secondaries of said converters and one or more
induction transfer coils connected across said leading wires and having connected with
them three or more sub-circuits or distributing wires each two sub-circuits having a
fraction of the transfer coil included between them, as and for the purpose described.
Second. The herein described system of alternating current distribution comprising
alternating current mains leading from a suitable source of current supply, converters
or transformers connected in multiple across said main, leading wires or m.ins
connected to the secondaries of said converters, induction transfer coils connected
across said leading wires, and sub-circuits or distributing wires leading from and
including a fraction of said transfer coils, said leading wires supplying current to
still other transfer coils for the purpose of still further subdividing the potential, as
and for the purpose described.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.