Improvements in Electric Transformers.
Year: 1892

page_text: Date of Application, 29th Nov., 1892
Complete Specification Left, 29th Aug., 1893-Accepted, 30th Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in Electric Transformers.
I, CHARLES EUGEN LANCELOT BROWN of Baden, Switzerland, Engineer and
Manufacturer, do hereby declare the nature of this invention to be as follows:-
This invention has reference to improvements in the construction of electric
transformers suitable for ordinary or single phase alternating currents as I will now
proceed to explain by aid of the accompanying drawings in which
Fig. 1 is a longitudinal section partly in elevation; and
Fig. 2 is a cross section also partly in elevation of an electric transformer
according to this invention.
The iron core N on which the primary and secondary windings are mounted,
consists of a number of thin insulated sheet metal plates clamped between two
gun-metal plates B° B° by means of insulated pins or screws R R¹.
The core thus:
formed is turned to a cylindrical shape which has the advantage of requiring less
copper for the windings than other shapes for obtaining a given effect and at the
same time facilitates the application of the windings thereto.
Each end of the cylindrical core is flattened at its underside as at N¹ to enable it
to be conveniently fitted to the two end surfaces of a U-shaped magnetic mass Co
consisting of insulated iron sheets. The two parts N and Co when placed one upon
the other as shown form a closed magnetic circuit. These L-shaped sheets of iron
forming the mass C" are pressed into the lower part of a box B which constitutes
the envelope of the converter. This box B is formed with external ribs A A
that increase the stiffness of the box and serve also to facilitate cooling thereof.
The windings are wound separately each on a tube of insulating material, for
example paper one winding being passed over the core, and the other winding passed
over the first one.
In Fig. 2 is shown a form of terminal suitable for the lower tension circuit..
This terminal comprises a cone K to which one end of the thick wire winding is.
fixed. The cone is surrounded with an insulating material and passes through a
conical hole bored in the box B in which it is secured by means of an insulated
washer and screw nut D so as to produce a tight-joint. A second nut E serves for
the attachment of one end of the external low tension wire. .
Fig. 1 shows in detail the construction of a terminal suitable for the high tension
circuit. This terminal comprises a conductor G enclosed within a tube V.of
suitable insulating material such as glass that is held in a stuffing box F. One end
of the conductor G is connected with the fine wire winding of the transformer, and
the other end with the external high-tension conductor or lead. The conductor G
is cemented into the tube V; and a tight joint is further ensured between these
parts by means of two leather discs C, C which are fixed by nuts against the ends
of the insulating tube as shown.
H is the cover of the box B. It is provided with two set screws II by which
the core N can be pressed upon the L-shaped laminated mass Co so as to ensure a
good magnetic contact. The heads of these set screws I I' are formed with holes.
that serve to receive a bar by which the set screws can be turned. These screws
also serve for facilitating the transport of the apparatus.
By the construction described the core N can be easily removed for the purpose
of testing and repairing the windings or for other purposes.
The box may with advantage be filled with oil which ensures a good insulation
for the various parts and renders the passage of static discharges more difficult than
if air be present; it also permits a slight transfer of heat from the windings to the
wall of the box to take place by means of convection currents produced in the oil..

page_text: Furthermore it forms a protection against moisture and allows of the transformer
being worked at a higher temperature without injuriously affecting the insulation,
than would be the case with air-insulation only.
Dated this 29th day of November 1892.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Electric Transformers.
I, CHARLES EUGEN LANCELOT BROWN of Baden, Switzerland, Engineer and
Manufacturer, 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 has reference to improvements in the construction of electric
transformers suitable for ordinary or single phase alternating currents, as I will
now proceed to explain by aid of the drawings left with my Provisional Specification
and in which,
Fig. 1 is a longitudinal section partly in elevation; and
Fig. 2 is a cross section, also partly in elevation of an electric transformer
according to this invention.
The iron core N or which the primary and secondary windings are mounted,
consists according to this invention of a number of thin insulated sheet metal plates
clamped between two gun-metal plates B° B° by means of insulated pins or
screws R R¹. The core thus formed is turned to a cylindrical shape, which has the
advantage of requiring less copper for the windings, than other shapes for
obtaining a given effect, and at the same time facilitates the application of the
windings thereto.
Each end of the cylindrical core is flattened at its underside as at N' to enable it
to be conveniently fitted to the two end surfaces of a L-shaped magnetic inass Co
consisting of insulated iron sheets. The two parts N and Co when placed one upon
the other, as shown, form a closed magnetic circuit. These U-shaped sheets of iron
forming the mass Co, are pressed into the lower part of a box B which constitutes
the envelope of the converter. This box B is formed with external ribs A A
that increase the stiffness of the box and serve also to facilitate cooling thereof.
The windings are wound separately each on a tube of insulating material, for
example paper, one winding being passed over the core, and the other winding
passed over the first one.
In Fig. 2 is shown a form of terminal suitable for the lower tension circuit.
This terminal comprises a cone K to which one end of the thick wire winding is
fixed. The cone is surrounded with insulating material and passes through a
conical hole that is bored in the box B, and in which the cone is secured by
means of an insulated washer and screw nut D so as to produce a tight-joint.
A second nut E serves for the attachment of one end of the external low tension
wire.
Fig. 1 shows in detail the construction of a terminal suitable for the high tension
circuit. This terminal comprises a conductor G enclosed within a tube V of
suitable insulating material, such as glass, that is held in a stuffing box F. One end
of the conductor G is connected with the fine wire winding of the transformer, and
the other end with the external high tension conductor or lead. The conductor G
is cemented into the tube V, and a tight joint is further ensured between these
parts by means of two leather discs C, C¹, which are fixed by nuts against the ends
of the insulating tube as shown.
H is the cover of the box B. It is provided with two set screws I l¹ by which
`the core № can be pressed upon the L-shaped laminated mass Cº so as to ensure a

page_text: good magnetic contact. The heads of these set screws, I I¹ are formed with holes
that serve to receive a bar by which the set screws can be turned. These screws.
also serve for facilitating the transport of the apparatus.
By the construction described, the core N can be easily removed for the purpose
of testing and repairing the windings, or for other purposes.
The box may with advantage be filled with oil, which ensures a good insulation
for the various parts, and renders the passage of static discharges more difficult
than if air be present; it also permits a slight transfer of heat from the windings
to the wall of the box to take place by means of convection currents produced in
the oil. Furthermore it forms a protection against moisture, and allows of the
transformer being worked at a higher temperature, without injuriously affecting the
insulation, than would be the case with air-insulation only.
Having now particularly described and ascertained the nature of the said. inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. An electric transformer, the magnetic circuit of which is made of laminated
iron in two main parts, one of which is cylindrical and carries the primary and
secondary windings and the other is L-shaped and joins the first so as to form
therewith a closed magnetic circuit substantially as herein described.
2. An electric transformer such as referred to in the preceding claim, in which
the primary and secondary windings are wound upon tubes of insulating material
such for example as paper, and are adapted to be readily passed over the iron core
and over each other, substantially as herein described.
3. An electric transformer such as referred to in Claim 1, in which the thin
insulated iron sheets comprising the cylindrical core on which the primary and
secondary windings are wound are clamped together by insulated pins or rods
substantially as herein described.
4. An electric transformer such as referred to in Claim 1, in which the two main
parts of laminated iron are pressed into close contact with each other by screws
such as I substantially as herein described.
5. In a transformer such as referred to in Claim 1, a box or receptacle the walls
of which project inward in such a manner as to hold the insulated metal sheets, of
which the L-shaped portion of the magnetic circuit is composed, in contact with
each other substantially as herein described.
6. An electric transformer such as referred to in Claim 1, enclosed within a metal
box formed with external ribs strengthening the box and facilitating radiation of
heat therefrom as set forth.
7. An electric transformer such as referred to in Claim 1, provided with terminals
constructed as described and shown.
8. My improved electric transformer constructed as described and shown.
ليوم
1000
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.