Improvements in and connected with Transformer Boxes.
Year: 1899

page_text: Date of Application, 3rd Aug., 1899.
Complete Specification Left, 5th June, 1900-Accepted, 21st July, 1900
PROVISIONAL SPECIFICATION.
Improvements in and connected with Transformer Boxes.
We, ALLAN JOHN LAWSON, of Moorgate Court, Moorgate Place, in the City of
London, JAMES DOUGLAS DALLAS, of 53, Egerton Gardens, Brompton Road, and
ERNEST THOMAS GOSLIN, of St. Davids, Mountnod Road, Streatham, both in
the County of London, Electrical Engineers, do hereby declare the nature of
this invention to be as follows:-
Our invention relates to iron transformer boxes and consists in the construction
and arrangement of safety switching devices in connection therewith whereby
the liability of a workman or attendant being killed or injured by coming into
contact with live fittings or connections is reduced to a minimum.
"
According to our invention which may be used in connection with either a
monophase or polyphase system of supply, the switch pillars are each provided
with two doors, one of which covers the high tension connections and the other
the low tension connections, the door covering the low tension connection
having a lip or tongues which projects or project into the path of the door for
the high tension connections in such a manner that the said door for the low
tension connections cannot be opened before the high tension door is opened
and must consequently also be closed before the high tension door. The said
doors are provided with contacts for completing the circuits when they are
closed and vice versa.
"
In arranging a transformer box or sub station for a polyphase system of
distribution the transformers are arranged so that they can be used individually
or banked" either with transformers in the same box or in neighbouring
boxes. The several groups of switch pillars in a box have arranged in conjunc-
tion with them. omnibus bars or cables to which the low tension system
of distributing cables is linked. The high tension mains are connected with
high tension plugs or switches grouped so that they can be used either singly
or in combination.
.
"
All the ironwork both of the box and of the internal fittings is "earthed"
and suitable upcast and downcast ventilating shafts are provided.
11 11.1
At 1900
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicants.
Improvements in and connected with Transformer Boxes.
We, ALLAN JOHN LAWSON, of Moorgate Court, Moorgate Place, in the City o
London, JAMES DOUGLAS DALLAS, of 53, Egerton Gardens, Brompton Road, anc
ERNEST THOMAS GOSLIN, of St. Davids, Mountnod Road, Streatham, both in
U...i1

page_text: the said bars extending throughout the length of the transformer box (if the
box is fitted for single phase distribution or through part thereof if for poly-
phase distribution) and being in electrical connection respectively with the two
poles of the low tension switches. These bars i, i are in connection at the end
of the transformer box with the distributing device whereby the different
local circuits are supplied with current as may be required.
With a transformer box or sub-station arranged as shewn in the drawing the
main high-tension current enters through the concentric cable A, passes through
the switch and thence through the switch to the cables 1, which supply
the high-tension switches in the boxes f,f; the current in each switch box
when the doors are closed, as above described, passes into the transformer e con-
nected therewith and thence back through the switches and to the return
circuit in the cable A. The current generated in the transformer e passes up
through one of the low-tension connections of the switch f and thence
through one of the omnibus bars to the local circuits supplied by the sub-
station and back along the other omnibus bar to the transformer.
Where it is desired to feed a second transformer box or sub-station directly
from the main station, the switch m is closed thus bringing it into electrical
connection with the main cable from the generating station or from another
box supplied from a generating station. By opening the said switch m this
supply can be cut off when not required, that is to say, when it is proposed to
render any substations or transformer boxes beyond dead. Similarly the
high tension connections to the transformers within the box may be rendered
dead" by opening the switch and the low tension cables may be wholly
disconnected from the transformers or omnibus bars by opening the respective
switch doors and disconnecting the same from the bars by removing the links
from the said bars, the continuity of the circuit in the low tension cables
between neighbouring boxes being maintained by placing the said links in a
horizontal position between the cable terminals and making them fast thereto
by screws or plugs provided for this purpose..
"
For ventilating the box we provide a downcast ventilating shaft n formed
in one of the end plates of the box thus saving space as these shafts have
hitherto usually been made separately from the boxes and outside the same.
The upper end of this shaft n is in communication with the passage or hole n¹
which communicates with the outer air through the perforated cover n² with
which the said hole is provided. o is the upcast shaft or passage formed in
the opposite end of the transformer box and leading into a similar passage n'
also in communication with the outer air through its perforated cover ²,
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is:-
―
A transformer box or sub-station constructed and fitted and having the parts
connected and with concentric mains throughout and protected terminals sub-
stantially as, and for the purposes and in the manner hereinbefore described
and illustrated in the accompanying drawing.
Data 5th day of Tu 1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicants.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicants.