An Improved System of Distributing Electricity by Means of Secondary Generators in Conjunction with Underground Conductors.
Year: 1889

page_text: Date of Application, 20th Dec., 1889
Complete Specification Left, 19th Sept., 1890-Accepted, 17th Jan., 1891
PROVISIONAL SPECIFICATION.
An Improved System of Distributing Electricity by Means of
Secondary Generators in Conjunction with Underground
Conductors.
We, GEORGE EDWARD BARKER PRITCHETT of Oak Hall Bishop's Stortford in the
County of Hertfordshire, Electrician, and HENRY ROBERT Low of 64 Tavistock
Crescent Westbourne Park in the County of Middlesex Electrician do hereby declare
the nature of this invention to be as follows:-
Our invention relates to improvements in and connected with the distribution and
supply of electricity by means of secondary generators or converters in conjunction
with underground conductors and its object is to provide a means whereby the con-
verters and all parts of the system in which a high difference of potential is employed
are placed in positions outside and apart from the houses or other structures which
they supply, also to provide a means whereby all joints in & branches from conductors
carrying a high difference of potential are rendered unnecessary excepting in such
places as are described hereafter.
For this purpose according to our invention we enclose the converters together with
the necessary safety appliances in cases or containers of waterproof material, preferably
iron, & provided with a moveable cover, the ends of the primary and secondary con-
ductors of the converter being led to a terminal board of suitable insulating material
placed within the aforesaid case.
These containers are placed at intervals beneath the surface of the ground and
in the line of the main primary conductors, which are led through the containers,
the ends of the primary conductors of the converters being connected to them on
the aforesaid terminal board on which also all joints in and connections from the
primary conductors are made; suitable provision is made for rendering watertight
the apertures through which the conductors pass.
The secondary or distributing conductors are connected to the converter on the
terminal board and are led out of the container in a similar manner to the primary
conductors.
Dated this Twentieth day of December 1880
GEORGE EDWARD BARKER PRITCHETT.
HENRY ROBERT LOW.
COMPLETE SPECIFICATION.
An Improved System of Distributing Electricity by Means of
Secondary Generators in Conjunction with Underground
Conductors.
We GEORGE EDWARD BARKER PRITCHETT of Oak Hall Bishop's Stortford in the
County of Hertfordshire, Electrician, and HENRY ROBERT Low of 41 Beaconsfield
Road St. Margaret's, Twickenham in the County of Middlesex, Electrician, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement-
Our invention relates to improvements in and connected with the distribution of
electricity by means of secondary generators or converters in conjunction with
underground conductors and its object is to provide a means whereby the con-
verters and all parts of the system in which a high difference of potential is
employed are placed in positious outside and apart from the houses or other
structures which they supply, also to provide a means whereby all joints in and
11

page_text: branches from conductors carrying a high difference of potential are rendered
unnecessary except in such pinces as described hereafter.
For this purpose according to our invention we enclose the converters together
with the necessary safety appliances in cases or containers of waterproof materials
preferably iron and provided with a moveable cover, the ends of the primary and
secondary conductors of the converter being led to a terminal board of suitable
material placed within the aforesaid case.
to
These containers are placed at intervals beneath the surface of the ground and
in the line of the main primary conductors which are led through the containers
the ends of the primary conductors of the converters being connected
them on the aforesaid terminal board on which also all joints in and connections
from the primary conductors are made, suitable provision is made for rendering
watertight the apertures through which the conductors pass, the secondary or dis-
tributing conductors are connected to the converter on the terminal board and
are led out of the container in a similar manner to the primary conductors.
We are aware that secondary generators together with terminal boards have been
placed in iron and other cases; we do not therefore claim this separately as part of
our invention.
The accompanying drawing shows a suitable arrangement according to our
invention.
Fig. I being a sectional elevation of a container placed beneath the surface of the
ground and
Fig. II a plan showing the arrangement of the switchboard the cover of the con-
tainer being removed.
Similar letters in both figures represent similar parts.
A is the container provided with a waterproof cover C.
Tis the transformer which may be supported by the switchboard B.
P. P. are the primary conductors carrying a high tension current and connected
through fuses f. f. to the primary conductors of the converter H. H. and S. S. the
secondary or low tension conductors connected through fuses F. F. to the secondary
conductors of the converter L. L.
D. D. are apertures through which the conductors pass and E. E. insulating
material such as pitch for the purpose of preventing admission of damp into the
container.
Having now particularly described and ascertained the nature of our said inveл-
tion and in what manner the same is to be performed we declare that what we
claim is:
1. A system for distributing electricity comprising the combination of high pressure
primary conductors, low pressure secondary conductors and cases containing secondary
generators and terminal boards placed beneath the surface of the ground in the manner
and for the purpose set forth.
2. The method of placing secondary generators enclosed together with terminal
boards, in suitable containers beneath the surface of the ground and in the line of the
primary conductors, as and for the purpose set forth.
3. The combination of the various electrical apparatus herein before specified, as ard
for the purpose set forth.
Dated this 10th day of Contoh 1000
GEORGE EDWARD BARKER PRITCHETT.
HENRY ROBERT LOW.