Improvements in the Distribution of Electrical Energy.
Year: 1890

page_text: Date of Application, 20th June. 1890
Complete Specification Left, 4th Mar., 1991-Accepted, 4th Apr., 1891
PROVISIONAL SPECIFICATION.
[Communicated from abroad by Messrs. SIEMENS & HALSKE, of 9ª Mark-
grafentrasse, Berlin, Electrical Engineers.]
Improvements in the Distribution of Electrical Energy.
We, SIEMENS BROTHERS & CO., LIMITED, of 12, Queen Anne's Gate, West-
minster, in the County of Middlesex, Electrical Engineers, do hereby declare the
nature of this invention to be as follows :-
This invention relates to an improved method and arrangement of apparatus for
enabling secondary batteries to be employed for storing up electrical energy produced
by alternate current machines.
It is well known that alternate current machines can be made to act as motors,
if there be imparted to them in the first instance a speed of rotation which will
produce therein an alternating current the phase of which shall be synchronous
with that of the alternate current of the generator and it is also known that a
rotary transformer can be readily produced which shall transform alternate currents
into continuous currents, by coupling an alternate current machine either directly
or indirectly with a continuous current machine.
If the alternate current machine be then supplied with alternating currents, it
can act as motor driving the continuous current machine, which will then produce
secondary continuous currents.
Such combined machines, which can be mechanically combined to form a single
apparatus, can also be employed in an inverted manner, that is to say for converting
continuous currents into alternating currents.
The present invention is based upon the above described action.
In arrangements heretofore proposed, the continuous current supplied to the
secondary battery by a combined alternate current motor and continuous current
dynamo, was supplied as continuous current from the secondary battery to the
circuit. According to this invention the continuous current from the secondary
battery is not sent into the circuit but is again employed for working rotary
transformers producing alternating currents, so that the network is supplied with
alternating currents by means of the secondary batteries in the same manner as
such currents are supplied from the central station.
The accompanying drawing shews diagrams of such an arrangement; Fig. 1
shews a case in which the accumulator battery is arranged at or near the central
station. Wis the primary alternate current machine of the central station which
supplies currents to the primary network P N from which the currents pass
through the transformers T into the secondary network S N. W is the secondary
alternate current machine which is coupled with the continuous current machine G
either directly or by suitable transmission. The continuous current machine G
supplies current to the accumulator batteries A. if these are to be charged.
on the other hand the charged batteries are to supply the network, the
continuous current from the batteries drives the machine Gas motor, which then
drives mechanically the alternate current machine W from which alternating
currents pass into the network, together with the currents proceeding from W¹, Wi
and W being connected in parallel.
Fig. 2 shews a similar arrangement, the only difference being that in this case
the accumulator batteries with their rotary transformer W2 G are connected directly
with the secondary circuit S N instead of with the primary circuit P N.
The above described mode of employing accumulator batteries on alternating
current circuits has the advantage over the known method first described, in that

page_text: the construction of the distributing network and its connections with the central
station can be much more varied, because the storing stations are of precisely the
same nature as the central station. It is also possible with this arrangement to
supply the current partly from the accumulator batteries and simultaneously,
partly from the central station.
With this mode of using rotary transformers, it is immaterial whether the
alternating currents supplied to the rotary transformers have before been transformed
one or more times in ordinary alternate current transformers the secondary batteries
can therefore be arranged either in the central station itself or in proximity thereto
or at a distance therefrom.
Dated this 20th day of June 1890.
ABEL & IMRAY,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in the Distribution of Electrical Energy.
We, SIEMENS BROTHERS & Co., LIMITED, of 12, Queen Anne's Gate, West-
minster, in the County of Middlesex, Electrical Engineers, 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 an improved method and arrangement of apparatus for
enabling secondary batteries to be employed for storing up electrical energy
produced by alternate current machines.
It is well known that alternate current machines can be made to act as motors,
if there be imparted to them in the first instance a speed of rotation which will
produce therein an alternating current the phase of which shall be synchronous
with that of the alternate current of the generator and it is also known that a
rotary transformer can be readily produced which shall transform alternate currents
into continuous currents by coupling an alternate current machine either directly
or indirectly with a continuous current nachine.
If the alternate current machine be then supplied with alternating currents, it
can act as motor driving the continuous current machine, which will then produce
secondary continuous currents.
Such combined machines, which can be mechanically combined to form a single
apparatus, can also be employed in an inverted manner, that is to say, for converting
continuous currents into alternating currents.
The present invention is based upon the above described action.
In arrangements heretofore proposed, the continuous current supplied to the
secondary battery by a combined alternate current motor and continuous current
dynamo, was supplied as continuous current from the secondary battery to the
circuit.
According to this invention the continuous current from the secondary battery is
not sent into the circuit but is again employed for working rotary transformers
producing alternating currents, so that the network is supplied with alternating
currents by means of the secondary batteries in the same manner as such currents
are supplied from the central station.
The drawing accompanying our Provisional Specification shews diagrams of such
an arrangement. Fig. 1 shews a case in which the accumulator battery is arranged
at or near the central station. W is the primary alternate current machine of the
central station which supplies currents to the primary network PN from which the
currents pass through the transformers T into the secondary network S N. W² is
the secondary alternate current machine which is coupled with the continuous
current machine G either directly or by suitable transmission. The continuous
current machine G supplies current to the accumulator batteries A if these are to
be charged.

page_text: If on the other hand the charged batteries are to supply the network, the
continuous current from the batteries drives the machine G as motor, which then
drives mechanically the alternate current machine W, from which alternating
currents pass into the network, together with the currents proceeding from W₁, Wi
and W being connected in parallel.
Fig. 2 shews a similar arrangement, the only difference being that in this case
the accumulator batteries with their rotary transformer WG are connected
directly with the secondary circuit S N instead of with the primary circuit P N.
The above described mode of employing accumulator batteries on alternating
current circuits has the advantage over the known method first described, in that
the construction of the distributing network and its connections with the central
station can be much more varied, because the storing stations are of precisely the
same nature as the central station.
It is also possible with this arrangement to supply the current partly from the
accumulator batteries and simultaneously partly from the central station.
With this mode of using rotary transformers it is immaterial whether the alter-
nating current supplied to the rotary transformers have before been transformed
one or more times in ordinary alternate current transformers, the secondary batteries
can therefore be arranged either in the central station itself or in proximity thereto
or at a distance therefrom.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:
1. In the distribution of electrical energy by means of alternating currents, the
combination of a rotary transformer with the alternate current generator, the main
distributing circuit and with accumulator batteries in such manner that both the
charging and the discharging of the accumulator batteries is effected through the
medium of the rotary transformer, this being made to convert the alternating current
from the central station into a continuous current for charging the accumulator
batteries, while on the other hand the continuous current received by the rotary
transformer from the charged accumulator batteries is transformed thereby into
alternating currents which are conveyed into the main circuit, substantially as
described.
2. In the distribution of electrical energy by means of alternating currents, the
combination of an alternate current generator supplying the distributing circuit
directly with alternating currents, a rotary transformer connected in parallel to the
distributing circuit, and accumulator batteries which are charged through the
transformer, and the current from which, when charged, passes through the rotary
transformer into the distributing circuit, substantially as described.
Dated this 4th day of March 1891.
ABEL & IMRAY,
Agents for the Applicants.