Year: 1899

page_text: Date of Application (in United Kingdom), 28th Feb., 1893
I, BENJAMIN GARVER LAMME, of 230, Stratford Avenue, Pittsburgh, in the
County of Allegheny and State of Pennsylvania, United States of America,
Electrical Engineer, do hereby declare the nature of this invention to be as
follows:-
:-
•
My invention relates to direct current systems of electrical distribution, and
has for its object to provide such an arrangement of mains in connection with a
compound wound generator, that said generator will be regulated to supply the
required amount of current both to translating devices near to the generator, and
to translating devices situated at a distance remote from the generator.
Under the usual arrangements those devices near to the generator have sub-
stantially the same effect in compounding as those devices some distance away
from the generator, consequently if both sets or devices are in use at the same
time the degree of compounding which is sufficient for the adjacent devices will
not suffice to overcome the drop in potential due to the resistance of the mains
between the generator and the distant translating devices, which latter will there-
fore receive too little current.
According to the present invention the devices are so arranged in connection
with the series coil of the generator that each device or set of devices compounds
the generator sufficiently to overcome the drop in potential due to the mains
between itself and the generator, independently of the other translating devices
in circuit. I do this by causing different fractions of the current supplied to each
translating device, or set of translating devices, to pass through the series coil
of the generator, so that those translating devices which are near to the generator
will exert a less compounding effect than those devices which are remote from the
generator, and each device will thus secure its proper quantity of current.
In the accompanying drawing Figure 1 is a diagram of a system of distribution
arranged in accordance with my invention and Figure 2 is a similar diagram
shewing a modification. 1 is the armature of the generator, 2 the shunt coil
011

page_text: thereof, and 3 the series coil. The ends of the brushes are joined to bus-bars 5
and 6 between which the shunt coil 2 is also joined, and the free end of the
series coil 3 is joined to the bus-bar 4. 7, 8, and 9 are resistances connected
between the bars 4 and 5 shunting the series coil 3. These resistances are shewn
in the form of coils, but may be of any suitable description, and it is intended
to indicate in Figure 1 that the resistances 7, 8, and 9, are of different amounts.
16, 17, and 18, are translating devices, of which 16 and 17 are comparatively near
to the generator, whilst 18 is furthest away from the same. The feeding con-
ductors 14, 15, of the translating devices 18 are connected to the bus-bars 6 and 4
in the usual way.
One of the leads 10 feeding the devices 16 is connected to
the bus-bar 6, and the other lead 11 is connected to the middle point of the
resistance 7. Of the feeding conductors 12 and 13 for the devices 17, 12 is con-
nected to the bus-bar 6, and 13 is connected to the middle point of the
resistance 9. It will be observed that the leads 11, 13, respectively, may be
connected to other than the middle points of the resistances 7, 9, so as to secure
different results as regards the compounding of the generator.
It will be clear that in an organisation of circuit such as shewn in Figure 1 a
fraction only of the current passing through the translating devices will pass
through the series coil 3, and owing to the fact that the shunts 7. 9, are of different
resistance, and that the leads 11, 13, 15, are connected to different points, the
fraction of the current utilised in the translating devices 16, which passes through
the series coil 3, will be different from the fractions of the currents used in
operating the devices 17, 18, which pass through the said series 3, consequently
the compounding-effect which the several devices exert will be different, and it
will be readily seen that by varying the resistances placed in parallel to the
series coil 3, or by varying the points of attachment to the leads 11, 13, 15, the
compounding effect exerted by the translating devices can be altered at will, and
adjusted to suit the distances of said translating devices from the generator.
In Figure 2 only one resistance 19 is shewn in parallel with the series coil 3,
and the leads 11, 13, for the translating devices 16, 17, are connected to different
points of said resistance.
In the system shewn in Figure 1, if we assume by way of example that the
resistance 7 is the only one employed, and that there are no translating devices 16
in circuit, and assume further for the purposes of illustration, that said resist-
ance is twice that of the series winding 3, then the current passing through the
series winding will be approximately two-thirds of the amount supplied to the
translating devices 18; if the translating devices 18 be cut out, and the trans-
lating device or devices 16 be connected in circuit, the other conditions being the
same as above described, the current passing through the series winding will be
approximately one-third that supplied to the translating device or devices 16. If
the translating devices 16 and 18 be in circuit, substantially one-half of the
current supplied by the generator armature will traverse the series winding,
thus serving to over-compound the generator sufficiently to supply the remote
translating devices with the necessary amount of current.
In Figure 2, assuming, for the purposes of illustration, that the resistance 19
is three times that of the series winding 3, and that said resistance is divided
into thirds by the connection of the conductors 11 and 13 therewith, if the
translating devices 18 only are in circuit the current traversing the series winding
of the generator will be approximately three-fourths that supplied to the trans-
lating devices with the translating device or devices 16 only in circuit, sub-
stantially one-half the current taken by the translating devices will pass through
the series winding: with the translating device 17 only in circuit, the current
traversing the series winding will be approximately one-fourth that passing
through the translating devices, and with all the translating devices in circuit,
the current traversing the series winding will be materially greater than when
the translating devices 18 are the only ones in circuit.
It will be understood from the foregoing description that the resistances and

page_text: their connections may be widely varied as regards both specific structure and
arrangement without departing from the invention.
Dated the 27th day of Webruary 1899
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.
Improvements in Direct Current Systems of Electrical Distribution.
I, BENJAMIN GARVER LAMME, of 230, Stratford Avenue, Pittsburgh, in the
County of Allegheny and State of Pennsylvania, United States of America,
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 direct current systems of electrical distribution, and
has for its object to provide such an arrangement of mains in connection with a
compound wound generator, that said generator will be regulated to supply the
required amount of current both to translating devices near to the generator, and
to translating devices situated at a distance remote from the generator.
Under the usual arrangements those devices near to the generator have sub-
stantially the same effect in compounding as those devices some distance away
from the generator, consequently if both sets of devices are in use at the same
time the degree of compounding which is sufficient for the adjacent devices will
not suffice to overcome the drop in potential due to the resistance of the mains
between the generator and the distant translating devices, which latter will there-
fore receive too little current.
According to the present invention the devices are so arranged in connection
with the series coil of the generator that each device or set of devices compounds
the generator sufficiently to overcome the drop in potential due to the mains
between itself and the generator, independently of the other translating devices
in circuit. I do this by causing different fractions of the current supplied to each
translating device, or set of translating devices, to pass through the series coil
of the generator, so that those translating devices which are near to the generator
will exert a less compounding effect than those devices which are remote from the
generator, and each device will thus secure its proper quantity of current.
2.
In the drawing accompanying my provisional specification Figure 1 is a
diagram of a system of distribution arranged in accordance with my invention,
and Figure 2 is a similar diagram shewing a modification. 1 is the armature of
the generator, 2 the shunt coil thereof, and 3 the series coil. The ends of the
brushes are joined to bus-bars 5 and 6 between' which the shunt coil 2 is also
'joined and the free end of the series coil 3 is joined to the bus-bar 4. 7, 8, and 9
are resistances connected between the bars 4 and 5 shunting the series coil 3.
These resistances, are shewn in the form of coils, but may be of any suitable
description, and it is intended to indicate in Figure 1 that the resistances 7, 8,
and 9, are of different amounts. 16, 17, and 18, are translating devices, of
which 16 and 17 are comparatively near to the generator, whilst 18 is furthest
away from the same. The feeding conductors 14, 15, of the translating devices 18
One of the leads 10
are connected to the bus-bars 6 and 4 in the usual way.
feeding the devices 16 is connected to the bus-bar 6, and the other lead 11 is
connected to the middle point of the resistance 7. Of the feeding conductors 12

page_text: and 13 for the devices 17, 12 is connected to the bus-bar 6, and 13 is connected
to the middle point of the resistance 9. It will be observed that the leads 11, 13,
respectively, may be connected to other than the middle points of the
resistances 7, 9, so as to secure different results as regards the compounding of the
generator.
It will be clear that in an organisation of circuit such as shewn in Figure 1 a
fraction only of the current passing through the translating devices will pass
through the series coil 3, and owing to the fact that the shunts 7, 9, are of different
resistance, and that the leads 11, 13, 15, are connected to different points, the
fraction of the current utilised in the translating devices 16, which passes through
the series coil 3, will be different from the fractions of the currents used in
operating the devices 17, 18, which pass through the said series coil 3, consequently
the compounding effect which the several devices exert will be different, and it
will be readily seen that by varying the resistances placed in parallel to the
series coil 3, or by varying the points of attachment to the leads 11, 13, 15, the
compounding effect exerted by the translating devices can be altered at will, and
adjusted to suit the distances of said translating devices from the generator.
In Figure 2 only one resistance 19 is shewn in parallel with the series coil 3,
and the leads 11, 13, for the translating devices 16, 17, are connected to different
points of said resistance.
In the system shewn in Figure 1, if we assume by way of example that the
resistance 7 is the only one employed, and that there are no translating devices 16
in circuit, and assume further for the purposes of illustration, that said resistance
is twice that of the series winding 3, then the current passing through the
-series-winding will-be-approximately two-thirds of the amount supplied to the
translating devices 18; if the translating devices 18 be cut out, and the trans-
lating device or devices 16 be connected in circuit, the other conditions being the
same as above described, the current passing through the series winding will be
approximately-one-third that supplied to the translating device or devices 16. If
the translating devices 16 and 18 be in circuit, substantially one-half of the
current supplied by the generator armature will traverse the series winding,
thus serving to over-compound the generator sufficiently to supply the remote
translating devices with the necessary amount of current:
In Figure 2, assuming, for the purposes of illustration, that the resistance 19
is three times that of the series winding 3, and that said resistance is divided
into thirds by the connection of the conductors 11 and 13 therewith, if the
translating devices 18 only are in circuit the current traversing the series winding
of the generator will be approximately three-fourths that supplied to the trans-
lating devices with the translating device or devices 16 only in circuit, sub-
stantially one-half the current taken by the translating devices will pass through
the series winding with the translating device 17 only in circuit, the current
traversing the series winding will be approximately one-fourth that passing
through the translating devices, and with all the translating devices in circuit,
the current traversing the series winding will be materially greater than when
the translating devices 18 are the only ones in circuit.
It will he understood from the foregoing description that the resistances and
their connections may be widely varied as regards both specific structure and
arrangement without departing from the invention.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. A system of distribution of direct currents from a compound wound gene-
rator so arranged that translating devices situated at different distances from the
generator exert different compounding effects thereon. substantially as described.
2. A system of distribution of direct currents from
a compound wound
generator in which different fractions of the main current corresponding to the

page_text: different distances of the translating devices from the generator are caused to
pass through the series magnet coil of the generator for the purpose specified.
3. A compound wound generator provided with a resistance or resistances
shunting its series magnet coil, the leads to the translating devices being con-
nected to different points in the said resistance or resistances for the purpose
specified.
4. The systems of distributing direct currents from a compound wound
generator, substantially as described with reference to the accompanying
drawings.