Improvements in Electrical Distribution by means of Alternating Current Transformers.
Year: 1891

page_text: Date of Application, 11th June, 1891
Complete Specification Left, 11th Mar., 1892-Accepted, 11th June, 1892
PROVISIONAL SPECIFICATION.
Improvements in Electrical Distribution by means of Alternating
Current Transformers.
I JAMES SWINBURNE & HAROLD EDWARD SHERWIN HOLT of Broom Hall
Works Teddington, Middlesex, Electrical Engineers do hereby declare the nature
of this invention to be as follows:
:―
The invention has reference to distribution by means of alternating current
transformers & feeders.
When high pressure feeders with transformers at the ends are used in alternating
current systems, we arrange a cut out switch in the secondary at the transformer,
so as to be controlled by the primary current. On breaking the primary at the
station, the secondary is then automatically broken too, an armature or core being
dropped by the cessation of the primary current.
Dated this 1st June 1891
SWINBURNE.
JAMES
H. E. SHERWIN HOLT.
COMPLETE SPECIFICATION.
Improvements in Electrical Distribution by means of Alternating
Current Transformers.
We, JAMES SWINBURNE & HAROLD EDWARD SHERWIN HOLT, of Broom
Hall Works, Teddington, 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 :-
The invention has reference to what are commonly known as feeding trans-
formers. When a low pressure net work is fed by high pressure transformers it is
sometimes desirable to disconnect them during the day so that the loss in the iron
at light loads is saved. It is necessary to disconnect both the primary and secondary
circuits.
This can be carried out as follows. When high pressure feeders with trans-
formers at the ends are used in alternating current systems we arrange a cut out
switch in the secondary at the transformer so as to be controlled by the primary
current. On breaking the primary at the station, the secondary is then
automatically broken too, an armature or core being dropped by the cessation of
the primary current.
On making the primary or feeder circuit at the station, the secondary is made
automatically by the switch. The transformer is thus put into or out of action
from the station without even demanding special control wires.
Of course one or any number of transformers at a substation may be manipulated
in this way; we prefer however to use a pure feeder system, the separate trans-
formers and switches being in the ground, or in special cellars.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed we declare that what we
claim is ;
1. In connection with a transformer, a switch on the secondary controlled by the
current in the primary as and for the purpose set forth.
2. A feeder or substation transformer with a switch in its secondary controlled
by the primary as and for the purposes explained.

page_text: 3. In a substation appliances for switching the secondaries of the transformers,
controlled from the central station by the primary circuit.
4. In a system of distribution by means of feeder or substation transformers,
controlling the transformers from the station by means of the primary circuits,
substantially as set forth.
Dated this 11th day of March 1892.
JAMES SWINBURNE.
HAROLD SHERWIN HOLT.