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Патент USA US2125096

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July 26, 1938.
B. D. BEDF‘OR‘D
2,125,096
ELECTRIC POWER TRANéMISSION SYSTEM
Filed on. 9, 1957
_ " Inventor:
Bunnice D. Bedf‘ r‘d,
by' WHis
M7Attorney
Patented July 26, 1938
2,125,096
In ‘ UNITED STATES
PATENT OFFiCE
2,125,096
ELECTRIC POWER TRANSMISSION SYSTEM
Burnice D. Bedford, Schenectady, N. Y., assignor
to General Electric Company, a corporation of
New York
Application October 9,
15 Claims.
1937, Serial No. 168,220
(Cl. 171-97)
My invention relates to electric power transmis
sion systems and more particularly to electric
power transmission systems of the type described
and claimed in United States Letters Patent
5 1,990,758 granted February 12, 1935, on appli
cation of Charles W. Stone, and assigned to the
assignee of the present invention.
Brie?y described, the system as disclosed in
the Stone patent shows a source of energy of
constant voltage alternating current which is
transformed to alternating current of constant
value and then recti?ed by an alternating cur
rent recti?er for transmission at high voltage
direct current.
The constant direct current is
15 transmitted over a transmission line to a re
ceiving circuit which includes an electric valve
allel to transmit power from or to a constant
voltage circuit or circuits. Each of the constant
voltage-constant current circuits includes suit
able means, such as a monocyclic network, for
transforming constant voltage alternating cur
rent to alternating current of constant value, or
vice versa.
Since the systems operate at con
stant current, the light load losses are substan
tially the same as under full load conditions and
the efficiency of the systems is materially re
duced. I provide suitable circuit controlling 10
means, such as switching apparatus, associated
with the monocyclic networks and the constant
current circuits to permit isolation of certain
of the monocyclic networks under light load
conditions, and which permit the operation of a 15
number of constant current circuits from a single
inverter for changing the transmitted energy to
alternating current of constant value which is
transformed to alternating current of constant
monocyclic network during light load conditions
tion with other constant voltage alternating cur
rent systems. The electric valve converting cir
cuits employ networks of the monocyclic type
for transforming alternating current from con
thereby reducing the current levels in a constant
current circuits and eiiecting an improvement in
operating e?iciency of the system. Other means
such as switching apparatus is also provided to
short circuit the constant voltage terminals of
These networks comprise reactances of opposite
light load operating conditions, thereby reduc
20 voltage for distribution purposes or for connec
25 stant voltage to constant current, or vice versa.
sign such as inductive reactances and capacitive
reactances. There has been evidenced a decided
need for arrangements in systems of this nature
30 to control the value of current at which energy
is transmitted over the direct current transmis
sion line in order to control the amount of the
power losses incident to the terminal appara
tus and to control the losses of the transmission
35 line under varying load conditions. This type
of control has become important in order to op
erate transmission systems of this nature at high
emciencies over wide ranges of energy transfer.
It is an object of my invention to provide a
40 new and improved electric valve power trans
mission system.
It is another object of my invention to provide
a new and improved electric valve power trans
mission circuit for transmitting electric power
45 at constant current.
It is a further object of my invention to pro
vide a new and improved system for controlling
the current level at which energy is transmitted
by a system of the type described in the above
50 mentioned Stone patent.
In accordance with one feature of an illus
trated embodiment of my invention, I provide an
improved system for controlling and operating
constant current alternating current systems in
55 which a plurality of circuits are operated in par
a monocyclic network in such a system during
ing the losses and increasing the e?iciency of 25
the system.
In accordance with another feature of an
illustrated embodiment of my invention, I pro
vide an improved electric valve power transmis
sion system of the type described in the above 30
mentioned Stone patent for transmitting elec
trical energy in the form of high voltage direct
current of constant value. The system is illus
trated as applied to an arrangement for trans
mitting energy between two constant voltage al
ternating current circuits and includes sending
end and receiving end translating apparatus
which connect the transmission system to the
respective circuits and effect the desired trans
40
formation between constant current direct cur
rent and constant voltage alternating current.
The terminal translating apparatus at the send
ing and receiving ends are similar in construc
tion and arrangement and each includes a plu~ 45
rality of electric circuits for transforming the
constant voltage alternating current to direct
current of constant value, or vice versa.
More
speci?cally, each of the electric circuits includes
a transforming means such as a monocyclic net
work comprising a plurality of branches of se
rially connected reactances of opposite sign, such
as inductances and capacitances, for transform
ing the constant voltage alternating current to
alternating current of constant value. The 55
2,125,096
2
transforming means, such as monocyclic net
monocyclic networks are provided with constant
work 4, for transforming constant voltage alter
nating current to alternating current of constant
value, or vice versa. The monocyclic network 4
voltage terminals which are connected to the
constant voltage circuit and also include con
stant current terminals which are connected to
includes a plurality of branches of serially con
nected reactances of opposite sign such as ea
pacitances 5 which are connected in series rela
tion with inductances 6; and the monocyclic
constant current alternating current circuits.
Electric valve means are interposed between the
constant current direct current circuit and the
constant ‘current alternating current circuits to
network L5 is provided with constant voltage ter
minals l and constant current terminals 8. The 10
constant voltage terminals 1 may be connected
transmit‘v energy .therebetween. Suitable switch
10 ing means are connected between the various
constant current alternating current circuits in to the constant voltage circuit l through suit
the several electric circuits to permit the ener-i' ‘ able switchingyapparatus 9, and the constant
gization of the electric valve vmeans in one of _ currentqterminals? are connected to a polyphase
the circuits from a monocyclic network in an
15
constantxcurrent ‘alternating current circuit l0.
other of the circuits, and other suitable switch
ing means are associated with the monocyclic
networks to connect the constant voltage termi
nals of the monocyclic networks to the constant
voltage alternating current circuit, or _to short
20 circuit the constant voltage terminals, thereby
ondary windings i3 is interposed between the
constant current alternating current circuit l0
and‘ an electric valve translating apparatus 14
to effect the desired voltage transformation there
between, The-electric valve apparatus is in
cludes electric valves iE-ZG, inclusive, which may
effecting a reductionin the value of direct cur
rent which is maintained in the constant current
direct current transmission‘circuit and provide
operate either-as a full wave rectifier or as an
an arrangement for reducing the power losses in
25
15
A'suitable inductive network, such as a trans
former H having primary windings l2 and sec
inverter depending onthe .direction of energy 25
transfer between the constant voltage circuits i
the terminal-apparatus under light load operating
conditions.’ ,Other' suitable switching appara
and 2. The electric valves lE-Zil include an
anode’ 2 I, a cathode 22, and a control member 23,
tus is also provided to ‘permit complete discon
nection. or isolation of a monocyclic network in
andare. preferably of the type employing an
one of ' the electric circuits under light load
30
ionizable medium. such as a gas or a vapor.
_Considering now the lower ‘ electric circuit’
to- eliminate the losses incident to
30 conditions
the operation ofthe monocyclic network under
connected to the‘ constant voltage circuit I, it
is tobe understood that this circuit is similar
Inaccordance with a further illustrated em
in {construction and arrangement to the upper
bodimentof ‘my invention 1- provide another circuit ‘and includes a monocyclic network24 35
arrangement for controlling the value of the cur-. having ‘constant voltage terminals 25 and con
35
rent which ismaintained in the constant current stant current terminals 26. A circuit controlling
direct current transmission line which comprises means, such as a switch 25’,.may be connected
an. inductivev network interposed between the tothe constant voltage terminals 25 and may be
monocyclic network and the electric valve means. arranged to connect the monocyclic network 24 40
The inductive network includes a transformer to the ‘circuit i when in the upper position, and
having a pluralityofprimary windings for each» to short circuit-the constant voltage terminals
phase. Suitable switching apparatus-is associ
when in the lower position. The constant cur
ated with the windingsto permit'the connection, rent. terminals 28 maybe connected to a constant
of'the; various primary phase windings in series current alternating current circuit 21 through a 45
or parallel relation tozeffectjhe desired. control suitable circuit controlling-means such as a switch
45
of the current. level ;_at which energy is trans
28,.and the. constantcurrent alternating current
mitted and hence control the losses of the ter—' circuit 27 is. connected to a transformer 29
minal apparatus underlight load operating con
which effects the desired voltage transformation
ditions.
~
;
"
'
between-the circuit 2? and the electric valve
.Forga better understanding of my, invention, translating apparatus 30, which'inturn is con
50 reference maybe hadtto the following descrip
nected to‘ the’ constant current direct current
tion taken in connection with the accompanying transmission line 3. The electric valve vappara
drawingand its scope will be pointed'out in the tus 36 is connected in. series relation with the
appended claims. Figs. 1 and 210i the accom-‘ electric‘valve apparatus 14 and the two electric
panying drawing diagrammatically show my in
valve groups are connected across the transmis
55
vention as applied 1 to an electric valve power
sion line 3. "The electric valves of the electric
transmission system of the type described in the valve apparatus 35.1v are also of the type employ
corresponding load conditions.
above mentioned Stone patent. '
.
1
>
1
Referring now to Fig. 1 of the accompanying
drawing, I provide an improved electric valve
transmission system for transmitting energy be
tween aconstant voltagealternating current cir
cuit i and a constant voltage'alternating cur
rent circuit '2 over a high voltage constant cur
65 rent- direct current’ transmission line 3.
The
system includes terminal'translating, apparatus
associated with the respective constant vvoltage
alternating current circuits. Considering the
translating apparatus associated with the con
stant voltage alternatingcurrent circuit 1, the
70
apparatus includes a plurality of electriccircuits
for effecting the.;transfer of energy. from the
constant voltage circuit to the constant current.
transmission line 3. For example, the upper elec751 tric circuit connected to circuit. I includes a.
ing an ionizable medium and may operate either
asa full wave recti?er or as an inverter, depend
ing upon the direction of energy transfer between
circuits iand 2. It, 'of course,‘ is to be under
stood that in the event energy is'being trans
mitted from circuit 2 to circuit i,~the electric
valve groups it and 30 must operate as inverters
to transform direct current to alternating cur
rent, and under such conditions of operation it
is necessary to control the conductivities of the‘
various valves thereof by proper energization of
the control members 23. . The control circuits for
members 23, for the purpose of simplifying the
explanationof the present invention,v have not
been shown. 'Any conventional excitation cir
cuit. mayv be used for this purpose‘ and I have
found'thatI may usean excitation system of
60
2,125,096
the type shown and described in United States
Letters Patent No. 1,935,464, granted November
14, 1933, upon an application of Clodius H.
Willis and assigned to the assignee of the pres
ent application.
As an agency for controlling the values of cur
rent maintained in the constant current alternat~
ing current circuits l0 and 21 and for controlling
the value of direct current which is maintained
10 in the constant current transmission line 3, I
employ a suitable circuit controlling means, such
as a switch 3!, which is interposed between the
constant current alternating current circuit id of
the upper electric circuit and the corresponding
15 circuit 2? of the lower electric circuit. The switch
3| connects the circuits I!) and 2'3 in parallel re"
lationship and permits the energization of trans
from
formerthe
29 monocyclic
and the electric
network
valve4. apparatus
When the
20
is
switches
moved 28
to the
and lower
3! areposition
closed to
andshort
the circuit
switch the
constant voltage terminals 25 of the monocyclic
network 24, the current output of the monocyclic
network 4 is divided equally between transformer
25 H and transformer 29, thereby e?ecting a ?fty
per cent reduction in the value of the direct cur~
rent which is maintained in the direct current
transmission line 3 as compared with
value
transmitted when both the upper and lower cir30 cuits are operating independently.
Of course,
switch 35 may be maintained in the closed posi
tion and switches 25' and 28 maintained in the
open positions to effect energization of trans
former 29 from the monocyclic network ii, and
35 also effecting complete isolation of the mono
cyclic network 24. This system of switching ap
paratus provides an expedient and convenient ar~
rangement for lowering the current level at which
energy is transmitted between circuits l and 2
40 and also provides a suitable arrangement for con
trolling or reducing the power losses of the ter
minal apparatus under light load operating con~
ditions.
The terminal apparatus associated with the
45 constant voltage alternating current circuit 2 is
similar in construction and arrangement to that
described above in connection with circuit !.
Brie?y stated, the upper electric circuit of the
terminal apparatus associated with circuit 2 in
50 cludes an electric valve translating apparatus 32,
a transformer 33, a monocyclic network
and
a switching means 35. The lower circuit com~
aprises
It
transformer
is to
an be
electric
understood
3'! valve
and atranslating
monocyclic
that
the electric
apparatus
network
valve
system will be explained brie?y by considering the
system when energy is being transmitted from the
constant voltage circuit I to the constant voltage
circuit 2. Switches 9 and 35, of course, will be
maintained in the closed circuit position and
switches 25' and 39 will be initially considered as
being in the upper positions to connect the mono
cyclic networks 24 and 38 to the constant voltage
circuits I and 2, respectively. Switches 23 and
46' will be maintained in the closed circuit posi
tions and switches 3i and 42 initially placed in the
open circuit positions. Under these conditions,
the electric circuits at the sending and receiving 20
ends of the system will transmit current inde»
pendently to the respective associated electric
valve groups to supply constant current direct
current to the transmission line 3. More speci?
cally, the various monocyclic networks transform 25
constant voltage alternating current to alternat~
ing current of constant value and vice versa; and
the electric valve groups transform the constant
current alternating current to direct current of
constant value and vice versa. The various elec~ 9
tric valve groups at the receiving and sending
ends are connected in series relation so that the
voltages generated thereby, or impressed thereon,
act in series relationship. As will be well under
stood, since the system is inherently a constant
current system the variations in load require
ments of the circuit 2 will e?ect a change in the
value of the direct current voltage appearing be—
tween the conductors of the direct current trans
mission line 3. Since the system is desigi d to
4:0
maintain a constant current in the transmission
line 3, it will be understood that as the load re
quirements of circuit 2 decrease the voltage ap
pearing between the conductors of the direct cur
rent circuit 3 will also be reduced materia y.
the losses occasioned by the terminal apparatus,
particularly the monocyclic networks
the as» 50
sociated transformer networks, will be maintained
at a substantially constant value eiiecting a ma~
terial reduction in the e?iciency of the transmis
sion system.
groups 32 and 36 may operate either as rectifiers
or as inverters, and it is to be noted that the
electric valve groups 32 and 36 are connected in
series relation with each other and connected
60 across the direct current transmission line
A
switching means 39 may be connected to the con
ciency under light load operating conditions, the
switching apparatus associated with the terminal
translating apparatus at the sending and receiv
work 38 to connect these terminals to the con
stant voltage circuit 2 or to short circuit these
65 terminals. Constant current terminals Lil of the
monocyclic network 38 are
ing means 46’ to provide
the monocyclic network
means G2 is employed to
connected to a switch
a means for isolating
38; and a switching
interconnect constant
70 current alternating current circuits
and lid of,
the upper and lower electric circuits, respectively.
The switching means 42 provides an arrangement
for energizing the transformer 3? and the electric
valve group 36 from the r.-onocyclic network 313
75 in the upper circuit and provides an arrange
45
24 at the since
However,
sending
theend
monocyclic
and the monocyclic
networks 41 net~
works 34 and 38 at the receiving end inherently
operate to maintain a constant current condition,
55
stant voltage terminals 46 of the monocyclic net
3
ment for controlling the current level at which
energy is transmitted over the constant current
direct current transmission line 3.
The general principles of operation of the
transmission system shown in Fig. 1 of the ac~
companying drawing are explained in the above
mentioned Stone patent. The operation of the
When it is desired to increase the system eiii
55
ing ends of the system may be manipulated to re
duce materially the system losses, particularly
the losses of several of the monocyclic networks,
the losses of the transformer networks and the
losses of the transmission line. To effect this re»
duction in power losses, switches 25’ and 39 may 65
be moved to the lower positions to short circuit
the monocyclic networks 24 and 38, respectively,
and switches 3| and 42 may be moved to the
closed circuit position to connect the constant
current alternating current circuits 2? and. 413 in 70
parallel with the constant current alternating
current circuits l0 and 0.3, respectively. Since
the monocyclic networks 24 and 38 are no longer
connected to the constant voltage circuits l and
2, respectively, the monocyclic networks 4 and 36 75
2,125,096
will energize'or receive'energy from both of the
electric circuits at the respective ends of the
transmission system. More particularly, mono
cyclic network it will energize-transformer 29 and
electric valvegrcup lit-as well as transformer H
and electric valve group it.‘ In like manner,
monocyclic network 3% at the receiving ‘end will
receive-energy from electric valve groups 32 wand
35 and transformers
and 37. Considering in
particular the terminal apparatus associated with
circuit I, since the monocyclic network 1% main
10
tains a predetermined constant alternating cur
rent output, the current 'will divide equally be
tween transformer H and transformer 29, e?ect
ing thereby a'?fty per cent'reduction in the value
15
of the direct current supplied to the transmission
line 3.‘ The voltage, however, will assume a
proper value to meet the load requirements of
circuit 2. Since the currents in the transformer
networks and the transmission‘line 3 ‘have been
reduced by one half, the power losses will be re
duced to approximately 25 per cent of the previ-'
ous conditions when both-circuits are supplying
energy through the respective monocyclic net
25
works.
"
7
Of course, switches}? and 39 and 23 and 40'
may be maintained in the open‘ circuit positions
to isolate completely the monocyclic networks
and 38 under light load operating conditions,
thereby completely eliminating the power losses
incident to the operation. ‘of these monocyclic net
works when the constant voltage terminals there
of are short circuited.
v
Although the operation or" the embodiment of
35 my invention shown in Fig. l'has been explained
for that condition‘ in which energy is trans
mitted from the constant voltage alternating
current circuit i to the constant voltage alter
nating current circuit '2, it is‘ to be'undcrstood
40
that the system may be operated to transmit
energy in either direction. Furthermore, it is
to be understod that I may employ three or more
circuits at the ‘receiving and transmitting ends
of the‘systern instead or" the two circuits shown
45
in Fig. l. Ifthre'e or more circuits are employed,
it is clear that the associated circuits may be
interconnected by switches performing functions
corresponding to thoseperformed by switches 3!
and A2 to control the current level at which
energy is transmitted 'over the direct current
transmission
line.
>
'
'
v
In Fig. 2 of thepaccompanying drawing there
is diagrammatically illustrated another ‘embodi
ment of my invention for controlling the current
55 level at which energy is transmitted over'a high
voltage, constant current, direct current trans
mission system. To facilitate description of't'he
arrangement, I have chosen to represent the ter
minal apparatus associated with only one of the
constant voltage constant current circuits. The
arrangement shown in Fig. 2 illustrates the ter
minal apparatus'which is connected to a ‘con
stant voltage alter. sting ‘current circuit'll-? and
includes a mo'nocyclic“network d6 comprising
65 capacitances li'd, {i3 and fit-which are respectively
connected in seriesrelation with inductances 58,
54 and 52 across the respective phases of the
constant voltage "circuit 515. The monocyclic
network ii?operates to transform constant vol
tage alternating current'to alternating current of
constant value and supplies a‘ polyphase constant
current system includingconductors 53, 54 and
55.
As an agency for controlling the magnitude
of the current output of the monocyclic network
75 car have chosen to employ an arrangement de
scribed and claimed. in a’ copencling patent appli
cation'of C. H.- Willis et al., Serial No. 70,575,
?led March 24, l936,-land assigned to the as
signee of the present’application. Control react
ances, such as capacitive reactances 56, 51 and
58, are associated with branches of the mono
cy‘clic network to control the net or e?ective 1mg
pedance thereof ‘and may be ‘controlled by suit
able devices such’ as a switching device 59, 5B or
El to'connect the'capacitances in the circuits to 10
effect the desired control'without disturbing ‘the
electrical symmetry of‘the' monocyclic network
48. While ‘I havechosen to show the control re
actances as' being capacitances, it is to be under
stood that I mayremploy inductances for this pur
pose if desired.
15
'
. As an additional arrangement for controlling
the current'level at which energy is transmitted,
I provide an inductive network,ysuchas a trans
former '62, having a plurality of primary windings
for each phase. For example, the primary wind
ing's are 63a and 63b, Elia and 64b, and sea and
and‘ 65b. ' Secondary windings 65 are connected
to an electric’ valve translating apparatus 6'!
which in turn is-con'nccted to a high voltage,
constant current, direct current transmission line
63.
The electric valves of the group 5? may oper
ate either as a full Wave recti?er or as an in
verter depending upon the direction of energy
transfer throughthe system. The primary wind
ings of transformer 52 are connected to the mono
cyclic network lie in the‘manner disclosed and
claimed in my copending application Serial No.
97,011, ?led August 20,1936, and assigned to the
assignee of the present invention.
To effect vcontrol of the current level at which
energy is transmitted over the constant current
direct current transmission line 68 by control of
the primary windings of the transformer 52, I
provide a plurality of ‘switching devices for con
necting the various windings for the respective
phases in parallel relation or in series relation.
For example, considering the constant current a1
ternating current circuit comprising conductors
53, a switching device 69 serves to ‘connect pri
mary windings 63a and 63b in series relation
and switches ‘ll! and'll serve to connect these
windings in parallel relation. In like manner, the
switching devices associated with phase conduc
tors 55 and 55 serve a's'an arrangement to con- ~
nect the respective’ primary phase windings of
transformer‘82 in series or parallel relationship.
The operation of the embodiment of my inven
tion shown in Fig. 2 will be explained'by consid¢
ering the system when energy is being transmitted
from the constant voltage alternating current cir
cuit 45 to the direct current transmission system
68. It is to be understood that'similar terminal
apparatus is associated with other constant volt
age-circuits not shown.v Let it be assumed that
the switches 59, it a'nd'iil are in the'upper cir
cuit position and that the values of the induct
ances and capacitances of the monocyclic network
and the control capacitancesare such that the
monocyclic network li?'is in a balanced condition
to supply a balanced system of constant alternat
ingcurrents to the primary windings of trans
former 62.
Furthermore, let it be assumed that
the switches 69 associated with the various pri—‘
mary phase windings are closed so that the pri~
mary windings are in series relation across the
output terminals of the monocyclic network. The
monocyclic network 46, of course, maintains con
stant current and these windings and the electric
valve group 61 effect transmission of energy in the
2,125,096
form of direct current of constant value over
transmission line 68. If the load required by
the circuit 63 decreases sui?ciently so that the
ratio of the power losses to the power output
of the terminal apparatus is increased materially,
the switches It and ‘it may be closed and the
switches '69 may be opened to decrease the current
level at which energy is transmitted over the
transmission line
The sequence in which the
10 switches 539, it‘ and ‘ii operate is important in
that when all of the switches are open the out~
put Voltage of the network
will tend to rise
to values which may injure the associated appara
tus. Therefore, the switches
l9 and I! should
15 all be closed momentarily and switch S9 opened
subsequently to effect this transition properly.
Of course, the voltage output of the electric
valve group 6? will change to effect the desired
power output at the new current level, but the
decrease in the current in the transmission line
and the current supplied to the transformer é32
5
necting in parallel the various constant current
alternating current circuits in said plurality of
electric circuits to energize the electric valve
means in one of the plurality of circuits from the
transforming means in another of the electric
circuits.
5
3. In an electric power transmission system the
combination of a constant voltage alternating
current circuit, a constant current direct cur
rent circuit, a plurality of electric circuits for
transmitting energy between said constant volt 10
age circuit and said direct current circuit and
each comprising transforming means for trans
forming constant voltage alternating current to
alternating current of constant value, a constant
current alternating current circuit and electric 15
valve means connected between the constant cur
rent alternating current circuit and the constant
the
2 arewindings
connected.
for intheparallel
arrangement
the power
shown
losses
in will
current direct current circuit, and means for
controlling said electric circuits to elfect ener
gization of all of said electric valve means from 20
one of said monocyclic networks to control the
value of the current at which energy is trans
be reduced to a value which is 25 per cent of that
mitted by said direct current circuit.
when the system is operating with the primary
phase windings in series.
While I have shown and described my invention
4. In an electric power transmission system
the combination of a constant voltage alternating 25
will effect a decrease in the power losses.
When
as applied to a particular system of connections
30 and as embodying various devices diagrammati
cally shown, it will be obvious to these skilled
in the art that changes and modi?cations may
be made without departing from my invention,
and I, therefore, aim in the appended claims to
cover all such changes and modi?cations as fall
within the true spirit and scope of my invention.
What I claim as new and desire to secure by
Letters Patent of the United States is:
1. In combination, a constant voltage alternat
40 ing current circuit, a constant current direct cur
rent circuit, a plurality of electric circuits for
transmitting energy between said constant volt
age circuit and said constant current circuit and
each comprising a monocyclic network for trans
45 forming constant voltage alternating current to
alternating current of constant value, said mono
cyclic network being provided with constant volt
age terminals and constant current terminals, a
constant current alternating current circuit con
50 nected to said constant current terminals and
electric valve means connected between the con
stant current alternating current circuit and the
constant current direct current circuit, means for
connecting the various constant current alternat
55 ing current circuits of said electric circuits in par
allel relationship to energize the various electric
valve means from a single monocyclic network
in one of said electric circuits, and means for se
lectively controlling the constant voltage termi
nal connections of another monocyclic net work
to connect said constant voltage terminals thereof
to said constant voltage circuit or to short circuit
said constant voltage terminals.
2. In combination, a constant voltage alternat
ing current circuit, a constant current direct cur
rent circuit, a plurality of electric circuits for
transmitting energy between said constant volt
age circuit and said direct current circuit and
each comprising transforming means 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 constant
current direct current circuit, and means for con
current circuit, a constant current direct cur
rent circuit, a plurality of electric circuits for
transmitting energy between said constant volt—
age circuit and said direct current circuit and
each comprising transforming means for trans 30
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 constant 35
current direct current circuit, and means con
nected between the various constant current al
ternating current circuits of said electric cir
cuits for controlling the value of direct current
which is transmitted to said direct current cir 40
cuit.
5. In combination, a constant voltage alter
nating current circuit, a constant current direct
current circuit, a plurality of electric circuits for
transmitting energy between said constant volt 45
age circuit and said direct current circuit and
each comprising a monocyclic network for trans~
forming constant voltage alternating current to
alternating current of constant value, a constant
current alternating current circuit and an elec 50
tric valve means connected between the constant
current alternating current circuit and the con
stant current direct current circuit, and means
for controlling the value of direct current which
is maintained in said direct current circuit com 55
prising switching means connected between the
various constant current alternating current cir—
cuits of said plurality of electric circuits and
switching means associated with the monocyclic
networks to selectively connect and disconnect 60
said networks from said constant voltage alter
nating current circuit.
6. In combination, a constant voltage alter
nating current circuit, a constant current direct 65
current circuit, a plurality of electric circuits for
transmitting energy between said constant volt
age circuit and said constant current circuit and
each comprising monocyclic networks for trans
forming constant voltage alternating current to
70
alternating current of constant value, said mono
cyclic networks being provided with constant
voltage terminals and constant current terminals,
a constant current alternating current circuit
connected to said constant current terminals and 75
6
2,125,096
electric valvemeans ' connected between the icon-g
stant current alternating current circuit andthe
constant current direct current circuit, means
for selectively controlling the constant voltage
5; terminal connections of. the monocyclic networks
to connect said constant voltage terminals. to
said- alternating voltage circuit. or to short cir~
cuitv said constantvoltage terminals'and means
interposed between the various constant cur
rent alternating current circuits of said electric
‘ circuits to connect said COIlStal'lt‘iCllI‘I'?Ilt alter:
nating current circuits in parallel to, e?ect ener- '
gization. of the electric valve means
each of
said electric circuits from a singlel'monocyclic
‘
1.5: network.
. 7‘ In combination, aconstant voltage'?alter
nating current circuit, a second constant voltage
alternating current circuit, a constant. current
direct current circuit, and: individual: terminal.
2.02 apparatus associated .with the first mentioned
constant voltage circuit andthe second constant
voltage circuit for eiiectingv transierlof energy
between the constant current direct currentcir
cuit. and the respective constant voltage alter»
nating current circuit, the terminal apparatus
associated with each of said constant voltage
alternating current. circuits’ each "comprising, a
plurality of electric circuits‘each including means
for transforming constant voltage alternating
3.03 current to alternating current of constant value,
a constant current alternating current circuit,
electric valve means connected between the asso
ciated constant current alternating current cir
cuit and the constant current‘ direct current
35:: circuit,.the electric valve means in the electric
circuits being connected in series relation and
means connected between the various constant
current alternating current circuits of the elec
tric circuits for controlling the value of direct
40; current which is transmitted'to or received from
said direct current circuit.
8. In combination, a constant voltage alter
nating current circuit, a second constant voltage
alternating current circuit, a constant current
direct current circuit, and individual terminal
apparatus associated with the ?rst mentioned
constant voltage'circuit and the second constant
voltage circuit ‘for effecting transfer of energy
between the constant current direct current cir
cuit ‘and the respective constant voltage alter
5.03 nating current circuits, the terminal apparatus
associated with each of said constant'voltage
circuits each comprising a plurality of electric
circuits including a monocyclic network for trans
forming constant voltage alternating current to
alternating current of constant value, a con
cuit and the respective constant voltage alternat
ing current circuits, the terminal apparatus asso
ciatedv with. each of said constant Voltagecircuits
comprising a plurality of electric circuits each
including a monocyclic networkfor transform
ing constant voltage alternating current to alter
nating current of constant value, a constant cur
rent alternating- current circuit, electric valve
means connected between the associated constant
current alternating current circuit and the con 10.
stant current direct current circuit, the electric
valve means in the electric circuits of each termi
nal apparatus being connected in series relation,
and means comprising switching devices con
nected between the various constant current al
ternating current circuits of the electriccircuits
and switching devices interposed betweenmono
cyclic networks in each of said terminal appa
ratus for controlling the value of direct current
which is transmitted to or received fromsaid 20.:
direct current circuit.
" 10. In combination, a constant voltageralten '
nating current circuit, a constant current direct
current circuit, a monocyclic network for trans
forming constant voltage alternating current to
alternating current of constant value, said net
work having constant voltage terminals con
nected to said constant voltage circuit and hav
ing constant current terminals, a constant cur
rent alternating current circuit connected to said 30
constant current terminals, an inductive network
connected to said constant current alternating
current circuit comprising a plurality of wind
ings, electric valve means connected between said
inductive network and said constant current di 35
rect current circuit, and means for controlling
the impedance of said inductive network to con
trol the value of the current transmitted by said
constant current direct ciu‘rent circuit.
11. In combination, a constant voltage alter 40
nating current circuit, a constant current direct
current circuit, a monocyclic network for trans
forming constant voltage alternating current to
alternating current of constant value, said net
work having constant voltage terminals con 45
nected to said constant voltage circuits and hav
ing constant current terminals, a constant cur
rent alternating current circuit connected to said
constant current terminals, an inductive network
connected to said constant current alternating
current circuit comprising a plurality of windings,
an electric valve means connected between said
inductive network and said constant current di
rect current circuit, and switching means for se
lectively connecting said plurality of windings 55»
in series relation or in parallel relation to con
stant current alternating current circuit, electric trol the value of the constant current trans
valve means connected between the associated mitted by said constant current direct current
constant current alternating current circuit and circuit.
12. In combination, a constant voltage alter
60 the constant current direct current circuit, the
electric valve means in the electric circuits of nating current circuit, a plurality of electric cir
connected to said'constant voltage circuit
each terminal apparatus being connected in cuits
series relation, and switching means connected and each comprising transforming means for
transforming constant voltage alternating cur
between the various constant current alternat
ing current circuits for controlling the currentv rent to alternating current of constant value and
each including a constant current alternating
level at which energy is transmitted between the
current circuit, and means for interconnecting
constant voltage alternating current circuits.
9. In combination, a constant voltage alternate the various constant current circuits to energize
ing current circuit, a second constant voltage at least two of said constant current circuits from
a single transforming means to control the cur
alternating current circuit, a constant current
rent level at which power is transmitted by the.
direct current circuit, and individual terminal
constant current circuits.
apparatus associated with the ?rst mentioned various
13. In combination, a constant voltage alters’
constant voltage circuit and the second constant hating current circuit, a load circuit, a plurality
voltage circuit for: effecting transfer of energy of electric circuits for transmitting energy be—. 75
between .the constant current direct current cir
2,125,096
tween said constant voltage circuit and said load
circuit and each comprising transforming means
for transforming constant voltage alternating
current to alternating current of constant value
and including a constant current alternating cur
rent circuit, and means for connecting in parallel
the various constant current alternating current
circuits in said plurality of electric circuits to
energize said constant current circuits from one
10 transforming means.
14. In combination, a constant voltage alter
nating current circuit, a plurality of electric cir
7
from a monocyclic network in another of said
electric circuits to control the current level at
which power is transmitted in the constant cur
rent circuits.
15. In combination, a constant voltage alter
nating current circuit, a plurality of electric cir
cuits connected thereto and each comprising a
monocyclic network for transforming constant
voltage alternating current to alternating cur
rent of constant value and each including a con
cuits connected thereto and each comprising a
stant current alternating current circuit, and
means for short-circuiting constant voltage term
monocyclic network for transforming constant
voltage alternating current to alternating cur
energizing the associated constant current cir
rent of constant value and each including a con
stant current alternating current circuit, and
means for isolating a monocyclic network in one
of said electric circuits and for effecting energiza
tion of the associated constant current circuit
10
inals of one of the monocyclic networks and for
cuit from a monocyclic network in another of 15
said electric circuits to control the current level
at which power is transmitted by the constant
current circuits.
BURNICE D. BEDFORD.
20
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