Improvements in Electrical Distribution and Transformers therefor.
Year: 1891

page_text: Date of Application, 21st Dec., 1891
Complete Specification Left, 20th Sept., 1892-Accepted, 22nd Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in Electrical Distribution and Transformers therefor.
I, JOSEPH DEVONPORT FINNEY ANDREWS, of No. 41, Parliament Street in
the County of London, Electrical Engineer, do hereby declare the nature of this
invention to be as follows:-
My invention relates to arrangements in connection with the conductors employed
for distribution of electricity supplying lamps or other electrical apparatus, the
chief object which I have in view being to effect distribution of large quantities of
electricity by comparatively small conducting mains, and to maintain great equality
of quantity of current in the respective mains. For this purpose, I adopt what is
known as the three wire arrangement of conducting mains consisting of what may
be termed a plus wire, a minus wire and a middle or balance wire.
These mains may be supplied with current in the known manner by two dynamos,
but I prefer to use only one dynamo and connect its poles to the primary circuit
of a transformer the secondary circuit of which is connected to the three wires of
the system of mains.
At any part of these mains where current is to be taken off for local use or
distribution, I introduce the primary coil of a transformer connecting the plus wire
to the middle wire and the middle wire to the minus wire, and from the secondary
coil of this transformer I take the induced current for local use or distribution.
Thus, throughout the system of conductors, there may be a number of transformers
each of which by its primary coil connects the plus, the minus and the middle wire,
and by its secondary coil effects local service.
I
The transformers employed as above described may be of any known kind.
prefer however to build a transformer up of a number of parallel wires or tubes
connected at their ends to form the primary circuit, these wires or tubes enclosed
in tubes connected to form the secondary circuit, and the whole protected and
insulated by a cover of bell form placed over the transformer within a vessel having
oil in the annular space between the bell and the side of the vessel. Over the
vessel may be placed an external bell cover.
Dated this 21st day of December 1891
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Electrical Distribution and Transformers therefor.
I, JOSEPH DEVONPORT FINNEY ANDREWS of No. 41 Parliament Street in the
County of London, 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 :-
My invention relates to arrangements in connection with the conductors employed
for distribution of electricity supplying lamps or other electrical apparatus, the
chief object which I have in view being to effect distribution of large quantities of
electricity by comparatively small conducting mains, and to maintain great equality
of quantity of current in the respective mains. For this purpose, I adopt what is
known as the three wire arrangement of conducting mains consisting of what may
be termed a plus wire, a minus wire and a middle or balance wire.
These mains may be supplied with current in the known manner by two
dynamos, but I prefer to use only one dynamo and connect its poles to the primary
Pombi |

page_text: circuit of a transformer the secondary circuit of which is connected to the three
wires of the system of mains.
Figure 1 of the accompanying drawing is a diagram illustrating this
arrangement.
a indicates the dynamo, the primary coil of a transformer and c c the secondary
coils connected to the three mains d d d.
At any part of these mains where current is to be taken off for a local use or
distribution, I introduce the primary coil of a transformer connecting the plus wire
to the middle wire and the middle wire to the minus wire, and from the secondary
coil of this transformer I take the induced current for local use or distribution.
Figure 2 is a diagram illustrating this arrangement, where a indicates the primary
'coils of a transformer and the secondary coils from which the induced current is
taken for local use or distribution.
Thus, throughout the system of conductors, there may be a number of trans-
formers each of which by its primary coil connects the plus, the minus and the
middle wire, and by its secondary coil effects local service.
"
The transformers employed as above described may be of any known kind..I
prefer however to build a transforiner up of a number of parallel wires or tubes
connected at their ends to form the primary circuit, these wires or tubes enclosed
in tubes connected to form the secondary circuit, and the whole protected and
insulated by a cover of bell form placed over the transformer, within a vessel having
oil in the annular space between the bell and the side of the vessel. Over the vessel
may be placed an external bell cover.
Figure 3 illustrates one construction of transformer in which a indicates insulated
parallel wires forming one circuit, which may be the primary, forming the
Becondary circuit, the whole surrounded by iron rings c.
As shewn in Figure 4, a are insulated wires and bare tubes enclosing them and
surrounded by iron rings c.
As shewn in Figure 5, both a and b are tubes. As shewn in Figure 6, the tube
is not insulated from the rings c. Instead of employing rings an iron tube bas
shewn in Figure 7, may be employed for the secondary. Figure 8 is a vertical
section shewing the transformer protected by a bell cover a preferably of insulating
material with an outer casing e which may be of metal. c is a base presenting an
annular trough which is charged with oil d. The oil recess instead of being at the
bottom as shewn in Figure 8, may be at the top as shewn in Figure 9, where the
cover a is made with an annular recess holding the oil d into which dips a flange
projecting down from the cover e. As shewn in Figure 10, the transformer 6 may
be horizontal within a rectangular case a covered by e, a flange of which dips into
the oil d.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
1. The herein described method of distributing electricity by the use
formers in combination with the three wire system of mains.
of
trans-
2. The construction of transformers with parallel wires or tubes or both, sub-
stantially as described with reference to Figures 3 to 7 inclusive..
3. The method of protecting and insulating transformers, substantially as described
with reference to Figures 8, 9 and 10.
Dated this 20th day of September 1892
ABEL & IMRAY,
Agents for the Applicant.