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Патент USA US2125097

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July 26, 1938.
a D. BEDFQRD
2,125,09?
ELECTRIC POWER SYSTEM
Filed Oct. 9, 1937
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July 26, 1938.
B. D. BEDFORD
2,125,097
ELECTRIC POWER SYSTEM
Filed Oct. 9, 1937
2 Sheets-Sheet 2
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Patented July 26, 1938
2,125,097
UNITED‘ STATES PATENT Orr-"lea
2,125,097
ELECTRIC ‘POWER SYSTEM
Burnice D. Bedford, Schenectady, N. Y., assignor,
to General Electric Company, a corporation of
New York
Application ‘October 9, 1337, Serial No. 168,221
20 Claims.
" My invention relates to electric power systems
and more particularly to electric power transmis
sion systems of the type disclosed and claimed in
United States Letters Patent No. 1,990,758, grant
5 ed February 12, 1935, on an application of Charles
W. Stone and assigned to the assignee of the pres
ent invention.
,
Brie?y described, the system as disclosed in the
Stone patent comprises a source of power of con
stant voltage alternating current which is trans
formed to alternating current of constant value
and then recti?ed by an alternating current rec
ti?er for transmission at high voltage direct cur
rent. The constant direct current is transmitted
15 over a transmission circuit to a receiving circuit,
which includes an electric valve inv'erter for
changing the transmitted power to alternating
current of constant value which is transformed
to alternating current of constant ‘voltage ‘for
distribution purposes or for connection with an
other constant voltage alternating current sys
tem. The electric valve converting circuits em
ploy networks of the monocyclic type for trans
forming alternating current from constant volt
age to constant, current, or vice versa.
These net
works comprise reactances of opposite sign such
as inductive reactances and capacitive reactances.
My invention relates to an improvement of the
electric power transmission system disclosed in
my joint copending patent application Serial No.
97,012, ?led August 20, 1936, and which is as
signed tothe assignee of the present application.
In electric power transmission systems of this
type, as explained in the copending application,
1..) it has been found desirable to employ a plurality
of electric circuits which are interposed between
a single constant voltage alternating current cir
cuit or a plurality of constant voltage alternat
ing current circuits and the high voltage direct
119' current circuit to e?ect the most satisfactory op~
eration of systems of this nature. When a plu
e -:
rality of electric circuits are‘so used, it has be
come evident that there is a decided need for ar
rangernents to control the division of load among
45 the various electric circuits, and furthermore it
has become evident that there is a need for ap
paratus which ‘not only controls the division of
load among the various circuits but also controls
the current transmitted to or received from the
50 various monocyclic networks employed in the sys
tem.
'
It is an object of my invention to provide a
new and improved electric power transmission
system.
55 i It is another object of my invention to provide
(Cl. 171—97)
a new and improved control and regulating ar
rangement in an electric system of the constant
voltage, constant current type comprising aplu
rality of constant voltage circuits and-a plurality
of constant current circuits for maintaining a 5
predetermined» division of load among the various
electric circuits and for controlling the values of
current in the various constant current circuits.
It is a further object of my invention to provide
a new and improved electric valve system of the 10
type described and claimed in the above men
tioned Stone patent and in my copending joint
application Serial No. 97,012,
It is a still further object of my invention to
provide a new and improved electric valve power 15
transmission system of the type in which energy
is transmitted in the form of high voltage, con
stant current, direct current and in which there
are provided arrangements for controlling the
division of load among the several electric circuits 20
associated with the system.
In accordance with one feature of the illus
trated embodiments of my invention, I provide a
new and improved control or regulating system
for controlling the division of load among a plu- 25
rality of constant voltage-constant current cir
cuits. Suitable transforming means, such as
monocyclic networks, are interconnected between
the constant voltage circuits and the constant
current circuits to e?ect the desired transforma- 30
tion constant voltage to constant current, or vice
versa, and suitable arrangements are intercon
nected between the various pairs of constant volt
age-constant current circuits to maintain a pre
determined division of load among the various 35
circuits and to control the values of the currents
maintained in these circuits.
In accordance with another feature of the illus
trated embodiments of my invention, I provide
a new and improved electric valve power trans- 4U
~mission system of the type in which energy is
transmitted in the form of high voltage direct
current of constant value and in which power
may be transmitted between constant voltage al
ternating current systems. The apparatus asso- 45
ciated with the constant voltage systems com
prises a plurality of electric circuits for trans
mitting power between the constant voltage al~
ternating current circuits and the direct current
circuit and each includes a suitable transforrn- 50
ing means such as a monocyclic network com
prising a plurality of branches of serially con
nected reactances of opposite sign, such as in
ductances and capacitances, which transform
constant voltage alternating current to alternat- 55
2
9,125,097.
. ing current of constant value, or vice versa. Each
of the electric circuits includes .a constant cur
rent, alternating current circuit which is con
nected to the monocyclic network and an electric
valve means which is connected between the con
stant current alternating current circuit and the
constant current direct current circuit. To pro
vide an arrangement for maintaining a prede
termined division of load among the various elec
windings I1, is connected to the constant cur
rent circuit I4 to obtain a predetermined voltage
transformation of the constant current voltage
of the monocyclic network ‘I.v The transformer
I8 through the connections of the secondary
winding I1, is connectedito an electric valve
translating apparatus I8 including electric valves
I9-24, inclusive, which effects the transfer of
energy between the constant current alternating
current circuit I4 and a high voltage, constant 10
current, direct current transmission line 25. The.
associated with corresponding elements of the__ electric valves I9-24 are preferably of the tyne
emplcying an ionizable medium, such as a gas
monocyclic networks and which maintain a‘pre
10 tric circuits, I employ an inductive network com
prising a plurality ‘of inductive devices which are
or a vapor, and each includes an anode 26, a"
determined division of current among the re
cathode 21 and a control member 28. The elec-v 16’
cuits. The networks of the inductive devices may tric‘ valve apparatus I8 may operate either as‘
a full wave recti?er or as an inverter, depend
be connected in series relation with correspond
ing upon the direction of energy transfer over
ing elements of the monocyclic networks. Con
the system. In the event the energy transfer is
trol windings are also associated with the induc
20 tive devices to control the impedances of the from circuits 3 and 4 to circuits I and 2, the 20
devices and hence to control the magnitudes of‘ electric valve apparatus I8 operates as an in
the currents which are maintained in the constant verter, in which case it is necessary that the con-'
trol members 28 be energized to render the elec
current alternating current circuits by the var
15
spective constant current alternating current cir
ious monocyclic networks. In accordance with
25 another embodiment of my invention, suitable
controlling means such as switching apparatus
and associated impedance elements are provided
to shunt the inductive devices in the event it is
desired to control the load division controlling
30 apparatus.
»
For a better understanding of my invention,
reference may be had to the following descrip
granted November 14, 1933, upon an applica
tion of Clodius H. Willis and assigned to the 30
assignee of the present application. ‘
The electric circuit 6 associated with the con- '
stant voltage circuit 2 is substantially similar to
- tion taken in connection with the accompany
s5
tric valves conductive periodically. , Suitable ex
citation circuits may be employed for this pur 25
pose. I have found that I may employ an 'ex
citation circuit of the type disclosed and claimed
in United States Letters Patent No. 1,935,464,
ing‘ drawings and its scope will be pointed out
electric circuit 5 and includes a monocyclic net
in the appended claims. Figs. 1 and 2 of the
work 29, comprising inductances 33 and capaci 35
accompanying drawings diagrammatically illus
tances 30', a constant current alternating cur
trate embodiments of my invention as applied
to electric valve power transmission systems for
transmitting energy in the form‘ of high voltage,
40 constant current direct current.
'
rent circuit 3I, a. transformer '32 having pl‘!
mary windings 33 and secondary windings 34'
and an electric valve translating apparatusiS.“
It will be noted, however, that the secondary 40
Referring now to Fig. 1 of the accompany
ing drawings, I have illustrated my invention
as applied to ‘an electric valve power transmis
windings 34 of transformer 32 are arranged in
a Y connection, whereas secondary windings I1
of transformer I5 in electric circuit 5 are con
sion system for transmitting electrical energy
in
the form of high voltage} direct current of
45
constant value. The system is shown as applied
nected in delta. This arrangement effects-"a
highly desired diminution in magnitude and
phase displacement between the pulsations of‘
to an arrangement for transmitting power be
tween constant voltage alternating current cir
cuits I, 2 and constant voltage alternating cur
rent circuits 3 and 4. While for the purposes
V50 of explaining my invention I.have chosen to
represent the various constant voltage circuits
as being separate, it is to be understood that
circuits I and. 2 may be connected toa single
55 constant voltagecircuit and that circuits 3 and
4 may also be connected to a single constant
voltage alternating current circuit. It is to be
' noted that the apparatus associated with cir
cuits I and 2 and circuits 3 and 4 are similar in
60 construction and arrangement and that there
is effected by this arrangement a predetermined
electrical symmetry. Considering ?rst the ap
paratus associated with circuits I and 2, I employ
a plurality of electric circuits 5 and 6 which are
65 associated with the constant voltage circuits I
and 2, respectively. Electric circuit 5 comprises
a monocyclic network 1 including a plurality of
branches of serially connected reactances of op
current in the transmission line 25 and accord
ingly decreases the telephone interference factor.
This feature is disclosed and claimed in my co
pending joint application Serial No. 97,012 pre
viously referred to. As an agency for maintain
ing a predetermined division of load between thev
electric circuits 5 and 6 and hence to maintain.‘
a, predetermined division of current between the
constant current circuits I4 and M, I provide a
reactive network 36 including a plurality of in
ductive devices 31, 38 and 39. While the net
work 33 is shown as being of the inductive type,
it is to be understood that I may employ a ca
pacitive network if desired. Furthermore,' the
inductive devices 31-39 may be of the‘ saturable .
type to limit the amount of‘ balancing effect
under fault conditions. The inductive devices
31-39 serve to control the resultant impedance
of the monocyclic networks to maintain the de
sired division of load and current. Each-of the
inductive devices 31-39 is provided with a wind
ing 40 which is associated with corresponding
reactive elements of the monocyclic networks 1‘
posite sign, such as capacitances 8, 9 and III,
70 which are respectively- connected in series rela ' and 29. The windings 40 are connected in cir 70
cuit with corresponding inductances of the mono
tion with inductances II, I2 and I3. A con
stant current, alternating current circuit I4 is cyclic networks 1 and 29 and maintain a pre
connected to constant current terminals of the determined division of- load between circuits 5 .
monocyclic network 1 and a transformer I5, and Why a current equalizing operation. Each
75 having primary windings I3 and secondary of the inductive devices, 31-39 is provided with‘ 75
2,125,097
a control winding 4| which controls the im
3
pedance of the associated windings 43 and hence
ings 4|, the resultant impedances of the mono
cyclic networks 1 and 23 may be adjusted to con-
controls the resultant or effective impedance of
the associated inductances in the monocyclic net
trol the values of alternating currents which are
works 1 and 29. I provide a suitable arrange
ment 42 for controlling the energization of con
ii’ it is desired to decrease the energy transfer be
tween constant voltage circuits | and 2 and the
trol windings 4| by controlling the magnetiza
tion of the inductive devices‘. The arrangement
42 may be any suitable device and for the pur
10 pose of illustration I have chosen to represent
this controlling means as comprising a direct
maintained in circuits l4 and 3|. For example,
transmission line 25, the resultant impedance of
the inductive branchespt the monocyclic net
works 1 and 28 may be increased by e?ecting an
increase in the impedance of windings 40 of the 10
saturable inductive devices 31-33. This increase
current generator 43 having an armature 44, a in impedance is e?ected by a reduction in the
?eld winding 45 and a voltage controlling means magnetization of the saturable inductive devices
such as a rheostat 46. The controlling means 42, _- 31-33 from a saturated condition to a less satu
15 of course, may be manually or automatically rated condition, or to a completely desaturated
15
operated.
condition. The increase in impedance of the
The electric circuits associated'with the con
windings 43 of the inductive devices 31-33 in
stant voltage alternating current circuits 3 and 4 creases the resultant impedance of the monocyclic
are similar in construction and arrangement to networks 1 and 23 and decreases the value of
the corresponding electric circuits 5 and 6. Elec
constant current which is maintained in the con
tric circuits 41 and 48 are associated with the stant current alternating current circuits l4 and 20/
constant current direct current transmission line.
25 and the constant voltage, alternating current
circuits 3 and 4, respectively. The electric cir
cuits 41 and 48 are provided with electric valve
3|. Conversely, if it is desired to increase the
values of the currents maintained in circuits l4
and 3| and hence to increase the energy transfer
in the system, the saturation of the inductive .de 25
translating apparatus 48 and 58, transformers 5|
and 52, constant current alternating current cir
cuits-53 and 54, and monocyclic networks 55 and
56, respectively. An inductive network 51 is also
associated with the monocyclic networks 55 and
vices 31-33 is increased by increasing the energi
zation of the control windings 4|, e?'e'cting a de
crease in the resultant impedance of the mono
cyclic networks 1 and 29 and permitting thereby
56 and includes a plurality of inductive devices
which are associated with corresponding induct
ances of the monocyclic networks. The corre
energization of control windings 4|, of course,
may be controlled by the adjustment of the rheo
stat 46 of the circuit controlling means 42 to
obtain the desired value of current in circuits
l4 and 3|.
It is to be understood that the manipulation
or operation of the circuit controlling means 42
must be accompanied by proper manipulation of
the controlling means 58 associated with constant
voltage circuits 3 and 4 in order to maintain a
predetermined direction of energy transfer.
An important feature of my invention is the
manner in which the system operates in the
sponding elements of the inductive devices in net
work 51 are assigned reference numerals corre
sponding to like elements in the inductive net
work 36. A suitable controlling means 58, which
is similar to the circuit controlling means 52, is
associated with control windings 4| of the in
40 ductive devices 31-39 to control the impedances
I of the windings 40 and hence to control the re
sultant impedances of the monocyclic networks
55 and 56.
The general principles of operation of this type
45 of system diagrammatically shown in Fig. 1 are
described in detail in the above mentioned Stone
patent. Brie?y stated, the system will function
to transfer energy between the constant voltage
alternating current circuits | and 2 and the con
stant voltage circuits 3 and 4 over the constant
current direct current transmission line 25, main
taining in the transmission line 25 a direct cur
rent of constant value.
For the purposes of ex
planation, let it be assumed that energy is being
55 transmitted from the constant voltage circuits |
and 2 to the constant voltage circuits 3 and 4.
Furthermore, let it be assumed that it is desired
to maintain an equal distribution of load between
electric circuits 5 and 6 and circuits 41 and 48.
The inductive network 36 operates to maintain
an equal distribution of load between electric cir
cuits 5 and 6. In addition, the inductive network
36 may be controlled by the controlling means 42
to control the magnitudes of the constant currents
which are transmitted to the constant current
alternating current circuits l4 and 3| by the
monocyclic networks 1 and 29.
The inductive devices 31-33 of the inductive
network 36 perform the load balancing function
70 by providing a current balancing path between
corresponding inductances of the monocyclic net
works 1 and 29. Furthermore, by controlling the
impedances of the windings 40 of the inductances
31-33 by controlling the saturation of the devices
75 by means of the energization of the control wind
the transfer of a greater amount of energy.
The 30
event one of the electric circuits 5 or 6 becomes
defective when there is a great unbalance of one
of the circuits. For example, if electric circuit 6
is subjected to a fault condition and ii’ the in
ductive devices 31-39 are saturable, the electric
circuit 5 will operate independently irrespective
of the condition of circuit 6. In other words, the
saturable characteristics of inductive devices
31-39 vlimit the balancing effect of 'the inductive
network 36 and permits one of the circuits to op
erate independently in the event the other circuit
is subjected to a severe fault condition.
55
Fig. 2 shows another embodiment of my in
vention as applied to a transmission system which
is similar in many respects to the arrangement
shown in Fig. 1, and like elements have been as
signed corresponding reference numerals. An
inductive network 59 is associated with the mono
cyclic networks 1 and 29 of electric circuits 5 and
6, respectively, to maintain a predetermined
division of load among the electric circuits and
comprises a plurality of inductive devices 60-62
‘ each having inductively associated windings 63 85
and 64 which are connected in series relation with
corresponding reactances of the monocyclic net
works 1 and 28. For example, considering the
inductive device 60, winding 63 is connected in 70
series relation with inductance ll of monocyclic
network 1 and winding 64 is connected in series
relation with inductance 33 01' monocyclic net
work 29. As an agency for controlling the mono
cyclic networks and hence to control the balanc 75
4
2,125,097 '
ing e?ect between circuits 5 and 6, I employ con
trol impedance elements 65 and 66 which are
associated with monocyclic networks ‘I and 28,
respectively. The control impedances 65 and 661
are arranged to be connected in shunt relation
with inductive devices 66-62 by suitable circuit
controlling means such as switches 61 and 68,
respectively. When the switches 61 and 68 are
in the closed circuit positions, the e?ective or re
10 sultant impedances of the monocyclic networks
are, of course, decreased which effects a control
of the currents which are maintained in the con
stant current alternating current circuits II
15
and 3|.
Although the control impedances 65 in Fig. 2
are illustrated as being inductances, it is to be
understood that capacitive reactances or resist
ances may be employed if desired without de
parting from my invention in its broadest as
20 pects. Furthermore, it is to be understood that
the inductive devices 66-62 in the inductive net
work 59 may be of the saturable type and that
I may employ suitable means for controlling the
impedances of the windings 63 and 64 thereof.
25 These control means may be'either manual or
automatic.
The operation of the embodiment of my inven
tion shown in Fig. 2 is substantially the same as
that shown in Fig. 1. If it be considered that
energy is transmitted from the constant voltage
alternating current circuits I and 2 to the direct
current circuit 25, when the switches 61 and 68
are in the open positions the monocyclic networks
1 and 29 will maintain predetermined constant
currents in circuits II and 3| and the network
59 will maintain a predetermined division of load
between circuits 5 and 6. This balancing effect
is accomplished by the inductive relationship
between the windings 63 and 64 of the inductive
devices 60-62. If it is desired to control the
amount of balancing e?ect occasioned by the in
ductive network 59, the switches 61 and 68 may
be moved to the closed circuit positions to shunt
the network 59. Of course, under this condition
the resultant impedances of the monocyclic net
tween, and means for maintaining a predeter
mined division of load among said electric cir
cuits.
2. In combination, a plurality of constant volt-.
age alternating current circuits, a constant cur
rent direct current circuit, a plurality of electric
circuits each connected between a diiierent one
of said constant voltage circuits and said direct
current circuit for transmitting energy therebe
tween, each of said electric circuits comprising a
monocyclic network including a plurality of
branches, of reactances of opposite sign for trans
forming constant voltage alternating current to
alternating current of constant value, a constant.
current alternating current circuit and electric
valve means connected between the constant cur
rent alternating =current circuit and the direct
current circuit, and means common to the mono
cyclic networks for controlling the resultant im
pedances thereof to maintain a predetermined 20
division of load among the various electric cir-(
cuits.
3. In combination, a plurality of constant volt
age alternating current circuits, a constant cur
rent direct current circuit, a plurality of electric 25
circuits each connected between a di?erent one
of said constant voltage circuits and said direct
current circuit for transmitting energy there
between, each of said electric circuits comprising
a monocyclic network including ,a plurality of 30
branches of reactances of opposite sign for trans
forming constant voltage alternating current to
alternating current of constant value, a constant
current alternating current circuit and electric
valve means connected between the constant cur
35
rent alternating current circuit and the direct
current circuit, and a network of reactive ele
ments associated with the monocyclic networks
for maintaining a predetermined relation among .
the currents in the respective constant current 40
alternating current circuits.
4. In combination, a plurality of constant volt
works ‘I and 29 are also decreased which relation
increases the magnitudes of the constant currents
that are maintained in circuits l4 and 3| and
hence causes an increase in the value of direct
age alternating current circuits, a constant cur
rent direct current circuit, a plurality of electric
circuits each connected between a di?erent one of 45
said constant voltage circuits and said direct
current'circuit for transmitting energy therebe
tween, each of said electric circuits comprising a
monocyclic network including a plurality of
_
60 current which is maintained in circuit 25.
While I have shown and described my inven
tion as applied to a particular system of con-_
nections and as embodying various devices di
branches of reactances of opposite sign for trans 50
forming constant voltage alternating current to
alternating current of constant valuexa constant
current alternating current circuit and electric
agrammatically shown, it will be obvious to
55 those skilled in the art that changes and modi
v'fications may be made without departing from
my invention, and I, therefore, aim in the ap
pended claims to cover all such changes and
modi?cations as fall within the true spirit and
60 scope of my invention.
What I claim as new and desire to secure by
Letters Patent of the United States, is:
i. In combination, a plurality of constant volt
age alternating current circuits, a constant
65 current direct current circuit, a plurality of elec
tric circuits each connected between a di?erent
one of said constant voltage alternating current
circuits and said direct current circuit, each of
said electric circuits comprising means for trans
70 forming constant voltage alternating current to
alternating current of constant value, a constant
current alternating current circuit and electric
valve means connected between the constant cur
rent alternating current circuit and said direct
75 ciu'rent circuit for transmitting energy therebe
valve means connected between the constant
current alternating current circuit and the direct 55
current circuit, a network of inductive elements
associated with the constant current alternating
current circuits to maintain a predetermined di
vision of load current thereamong, and means for
controlling the impedances of said inductive ele 60
ments to control the magnitudes of the currents
in the respective constant current alternating
current circuits.
5. In combination, a plurality of constant volt
age alternating current circuits, a constant cur 65
rent direct current circuit, a plurality of electric
circuits each connected between a different one
of said constant voltage alternating current cir
cuits andsaid direct current circuit, each of said
electric circuits comprising means for transform 70
ing constant voltage alternating current to alter
nating current of constant value, a constant cur
rent alternating current circuit and electric valve
means connected between the constant current
alternating current circuit and said direct current 75
2,125,097
5
circuit for transmitting energy therebetween,
means for maintaining a predetermined division
for transforming constant voltage alternating
current to-alternating current of constant value,
01' load among said electric circuits, and means for
controlling the values of the currents in the vari
ous constant current alternating current circuits.
6. In combination, a plurality of constant volt
age alternating current circuits, a constant cur
rent direct current circuit, a plurality of electric
a constant current alternating current circuit
and electric valve means connected between the
constant current alternating current circuit and
the direct current circuit, means comprising a
saturable inductive reactance including a plu
rality of windings each common to corresponding
circuits each connected between a di?erent one inductances of said monocyclic networks and a
oi’ said constant voltage circuits and said direct plurality of control windings therefor, and means 10
current circuit for transmitting energy therebe
for supplying direct current to said control wind
tween, each of said electric circuits comprising a ings to control the currents which are trans
monocyclic network including a plurality of mitted to the various constant current alternat
branches of reactances of opposite sign for trans
ing current circuits by the respective monocyclic,
15 forming constant voltage alternating current to networks.
15
alternating current or constant value, a constant ,
10. In combination, a plurality of constant
current alternating current circuit and electric voltage alternating current circuits, a constant
valve means connected between the constant cur
current direct current circuit, a plurality of elec
rent alternating current circuit and the direct tric circuits each connected between a different
20 current circuit, and means common to corre
sponding reactances of like sign in said mono
cyclic networks to control the resultant imped
ances thereof to maintain a predetermined divi
sion of load among the various electric circuits.
25
7. In combination, a plurality of constant volt
age alternating current circuits, a constant cur
rent direct current circuit, a plurality of electric
circuits each connected between a di?erent one of
said constant voltage circuits and said direct cur
30 rent circuit for transmitting energy therebetween,
each of said electric circuits comprising a mono
cyclic network including a. plurality of branches
oi.’ reactances of opposite sign for transforming
constant voltage alternating current to alter
35 nating current of constant value, a constant cur
rent alternating current circuit and electric valve
means connected between the constant current
alternating current circuit and the direct current
circuit, means common to corresponding react
ances oi! like sign in said monocyclic networks to
control the resultant impedances thereof for
maintaining a predetermined division of load
among the various electric circuits, and means
for controlling said last mentioned means to con
trol the currents which are maintained in the
respective constant current alternating current
circuits.
8. In combination, a plurality of constant volt~
age alternating current circuits, a direct current
circuit, a plurality of electric circuits each con
nected between a different one of said constant
voltage circuits and said direct current circuit
for transmitting energy therebetween, each 0!
id electric circuits comprising a monocyclic net
'ork including a plurality of branches oi.’ serially
connected capacitances and inductances for
transforming constant voltage alternating cur
_ rent to alternating current of constant value, a
constant current alternating current circuit and
electric valve means connected between the con
stant current alternating current circuit and the
direct current circuit, and means comprising a
plurality of control inductive reactances asso
ciated with corresponding inductances of said
monocyclic networks to control the division of
load among said electric circuits.
9. In combination, a plurality of constant volt
age alternating current circuits, a direct current
circuit, a plurality oi electric circuits each con
70 nected between a different one of said constant
voltage circuits and said direct current circuit
for transmitting energy therebetween, each of
said electric circuits comprising a monocyclic
network including a plurality of branches of
serially connected capacitances and inductances
one of said constant voltage circuits and said
direct current circuit for transmitting energy
therebetween, each of said electric circuits com
prising a monocyclic network including a plural
ity of branches of serially connected inductances
and capacitances for transforming constant
voltage alternating current to alternating cur
rent of constant value, a constant current alter
nating current circuit and electric valve means
connected between the constant current al
ternating current circuit and the direct current
circuit, and a plurality of inductive windings
each connected in circuit with corresponding in
ductances of said monocyclic networks to main
tain a predetermined division of load among said
electric circuits.
11. In combination, a plurality of constant
voltage alternating current circuits, a constant
20
25
30
35
current direct current circuit, a plurality of elec
tric circuits each connected between a different \
one of said constant ‘voltage circuits and said
direct current circuit for transmitting energy
therebetween, each of said electric circuits com
prising a monocyclic network including a plu
rality of branches of serially connected induct- ~
ances and capacitances for transforming con 45
stant voltage alternating current to alternating
current of constant value, a constant current
alternating current circuit and electric valve
means connected between the constant current
alternating current circuit and the direct current 50
circuit, and a plurality of inductive devices each
having a winding connected in circuit with cor
responding inductances of said monocyclic net
works to maintain a predetermined division of
load among said electric circuits and having as 55
sociated control windings for controlling the
magnitudes of the currents in the respective con
stant current alternating current circuits.
12. In combination, a plurality of constant
voltage alternating current circuits, a constant 60
current direct current circuit, a plurality of elec
tric circuits each connected between a different
one of said constant voltage circuits and said
direct current circuit for transmitting energy
therebetween, each 01' said electric circuits com 65
prising a monocyclic network including a plural
ity of branches of serially connected inductances
and capacitances for transforming constant
voltage alternating current to alternating cur
rent of constant value, a constant current alter 70
nating current circuit and electric valve means
connected between the constant current alter
nating current circuit and the direct current cir
cuit, a plurality of inductive devices each having
a winding connected in circuit with correspond 75
2,125,097
ing inductances of saidinonocyclic networks to
impedance elements arranged to shunt the wind
maintain a predetermined division of load among
said electric circuits and having an inductively
ings of said. inductive devices to control said
monocyclic networks.
16. In an electric power transmission system
of the constant current direct current type for
transmitting energy between constant voltage
alternating current circuits, the combination of
a plurality of electric circuits‘ associated with
_associated control winding for controlling the
_ magnitudes of the currents in the respective con-v
stant current alternating current circuits, and
means for controlling said control windings.
13. In combination, a plurality of constant
voltage alternating current circuits, a constant 'the constant voltage alternating current cir
10 current direct current circuit, a plurality of elec
tric circuits each connected between a different
one of said constant voltage alternating current
circuits and said direct current circuit, each of
said electric circuits comprising means for trans
15 forming constant voltage alternating current to
cuits, a constant current direct current trans
mission circuit, each of said electric circuits com
prising means for transforming constant voltage
alternating current to alternating current of con
stant value, a constant current alternating cur
rent circuit and electric valve means connected 15
between the constant current alternating current
alternating current of constant value, a constant
current alternating current circuit and electric ' circuit and the transmission circuit, and means
valve means connected between the constant \for maintaining a predetermined division of load
current alternating current circuit and said di
among the various electric circuits.
20 rect current circuit for transmitting energy
17. In combination, a plurality of constant 20
therebetween, and means comprising a saturable voltage‘alternating current circuits, a plurality
inductive reactance for controlling the division of constant current alternating current circuits,
means interconnected between'each pair of con
of load among said electric circuits.
14. In combination, a plurality. of constant stant voltage-constant current circuits for trans
25 voltage alternating current circuits, a constant forming constant voltage alternating current to 25
alternating current of constant value, and means
current direct current circuit, a plurality of elec
tric circuits each connected between a different interconnecting said ?rst mentioned means for
one of said constant voltage circuits'and said maintaining a predetermined division of load
direct current circuit for transmitting energy
30 therebetween and each comprising a monocyclic
network including a plurality of branches of
’ serially connected inductances and capacitances
among said electric circuits.
_
18. In combination, a plurality of constant 30
voltage alternating current circuits, a plurality
of constant current alternating current circuits,
for transforming constant voltage alternating
means interconnected between each pair of con
current to alternating current of constant value,
35 a constant current alternating current‘ circuit
and elecric valve means connected between the
constant current alternating current circuit and
stant voltage-‘constant current circuits compris
ing a monocyclic network for transforming con
35
stant voltage alternating current to alternating
each having inductively associated windings
current of constant value,“ and means for induc
tively coupling corresponding elements of the va
rious monocyclic networks formaintaining a pre
determined division of load among the ‘various 40
connected in series relation with inductances ofv
the respective monocyclic networks to maintain
constant current circuits.
19. In combination, a plurality of constant
a predetermined ‘division of load among the re
voltage alternating current circuits, a plurality
of constant current alternating current circuits,
the direct current circuit, and an inductive net
work comprising a plurality of inductive devices
spective electric circuits.
'
15. In combination, a plurality of constant
voltage alternating current circuits, a constant
current direct current circuit, a plurality of elec
tric circuits each connected between a different
one of said constant voltage circuits and said
vdirect current circuit for transmitting energy
therebetween and each comprising a monocyclic
network including a plurality of branches of se
rially connected inductances and capacitances
for transforming constant voltage alternating
55 current to alternatingcurrent of constant value,
a constantjcurrent alternating current circuit
and electric valve means connected between the
constant current alternating current circuit and
the direct current circuit, an inductive network
60 comprising a plurality of inductive devices each
having inductively associated windings con
nected in series relation with inductances of the
respective monocyclic networks to maintain a
predetermined division of load among the re
spective electric circuits, and‘means comprising
means interconnected between each pair of con
stant voltage-constant current circuits for trans
forming constant voltage alternating current to
alternating current of constant value, and means
connected to the transforming means for main
taining a predetermined division of load among 50
the various constant current alternating current
circuits and for. controlling magnitudes of the
currents therein.
.
20. In combination; a plurality of constant
voltage alternating current circuits, a plurality
of constant current alternating current circuits,
means interconnected between each pair of con
stant voltage-constant current circuits compris
ing a monocyclic network for transforming con
stant voltage alternating current to alternating 60
current of constant value, and means associated
with the monocyclic networks for controlling the
division of load among said circuits and for con
trolling the magnitudes of the currents therein.
BURNICE, D. BEDFORD.
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