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Патент USA US2136639

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Nov. 15, 1938.
Filed Nov. 9, 1956
2 Sheets-Sheet l
NOV. 15, 1938.
Filed Nov. 9’, 1936
2 Sheets-Sheet 2
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220 VOLT
Patented Nov. 15, 1938
Klaus Peter Schweimer, Berlin-Grunewald, Ger
many, assignor to Allgemeine Elektricitats
Gesellschaft, Berlin, Germany, a corporation of
Application November 9, 1936, Serial No. 109,872
In Germany November 25, 1935
7 Claims.
This invention relates to an improved carrier
current telephone supply source.
The object of this invention is to provide an
emergency, auxiliary source for wired radio ap
5 paratus which is particularly intended for the
supply of carrier-current telephony along power
The invention essentially consists of a
pilot relay designed to test the level of the line
potential at certain intervals, which is re-con
H O nected under the same magnetic condition with
the power system in which the relay operates in
the presence of normal voltage on the line. Addi
tional supervisory relays are provided for the
purpose of checking up on the voltage condition
15 of the station storage battery acting as an aux
iliary or emergency source, and of the converter
or inverted recti?er.
It is known from the prior art to operate high
frequency telephony equipment from the mains,
that is to say, all of the currents required for
the feed of the tubes and the relays are taken
from the alternating current line; it is also. known
in the art to provide auxiliary or emergency
sources of supply so that such auxiliary source
25 of current is automatically connected whenever
the line voltage happens to fall below a de?nite
pre-arranged level. However, certain dif?culties
arise in the operation of these schemes in prac
tice. Some of the trouble consists in that a state
30 of potential is liable to arise in which the auto
matic switching relay just happens to be ener
gized by a potential being at one time slightly
above, and at another time somewhat below the
level where the change~over occurs, with the re
35 sult that the relay is caused to operate all the
released, the said relay, by way of a change-over
contact, is immediately thereafter connected
again with a source of potential and maintained
in energized condition so that, when the clock
work reconnects the supervisory relay with the
line voltage, this operation is brought about in
the presence of energization. In other words, in
each supervisory action the relay is called upon
to merely ascertain whether by chance the volt
age has fallen below the limit and level which it
requires to keep its keeper or armature inva state
of attraction.
One exempli?ed embodiment of the invention is
illustrated by way of example in. Fig. 1 of the 15
annexed drawings schematically and Fig. 2 shows
a diagram of the time delay and auxiliary relay
portion of the invention.
Fig. 3 shows a com—
plete circuit diagram with the relays and their
corresponding contacts in line.
Referring to the drawings, HF is the radio
frequency appaartus, say, a radio frequency
transmitter and receiver equipment for a radio
frequency telephony along lines (wired radio)
more particularly over power lines, remote-con
circuits. In lieu of the radio frequency appara
tus there could be connected also some other
current-consuming device which is to be supplied
with voltage under conditions as permanently as
possible, with this condition that for service rea
sons the potential so supplied should never fall
below the normal feeding level. The radio fre
quency apparatus HF is united with the supply
line by way of the relay contacts 53 and .94, for ‘
example, a supply line working with alternating
tear of the relay contacts, but also unfavorable
action upon the auxiliary source of supply, the
installation to be so fed, and the switching means
used therefor.
Now, according to the invention the said draw~
backs are avoided by that, after the change-over
relay has been caused to respond, preferably after
the release of the relay energized from the line
voltage, the high-frequency communication ap~
paratus or other mains-supplied apparatus is fed
current of 220 v. It will be understood that the
arranged adjustable interval of time. Arrange
ments with this end in view are preferably so
50 made that, after the release of the relay with
supervisory action, the auxiliary source of supply
is connected only when the source of direct cur
rent to energize the same, such as the station or
storage battery, is ready for operation and serv
trol, tele-mechanical, telemeter'ing and similar
time. This not only means very rapid wear and
from the auxiliary source of supply for a pre
(Cl. 171-97)
supervising the line voltage has been actually
type of construction of the radio frequency equip
ment is immaterial in the present connection; for
this reason such details as the lines serving for
signal transmission and communication etc. have
been omitted in the drawings. Also connected
with the alternating current line N is a trans
former T in whose secondary circuit is connected
in series with a relay Pw by way of the “back”
contact of a change-over contact a2, a recti?er G
or a rectifier circuit arrangement, and a resist
ance W. E denotes an emergency or auxiliary
source of supply, such as a storage battery mount
ed in a power station wherein the equipment for
wired radio is installed. The voltage of the said
storage battery E is supervised by the aid of
a distinct relay Pg. GW indicates a motor gen
erator, an inverted converter or recti?er. The
ice. Moreover, it is preferable to cause connec~
tion of the auxiliary source of supply as a func
tion of the response of the voltage supervisory
relay only when a distinct relay serving to super
vise the voltage of the auxiliary source of supply
voltage of this converter device is checked up by 55
the agency of a separate relay S. In Fig. 2 relays
U, V denote auxiliary relays, Zt is a clockwork,
and M shown in Fig. l is a tripping relay.
has also been caused to respond, After the relay
arrangement is as follows:
Now, the operation of the above-mentioned
Suppose the voltage of the alternating current
supply line N drops a certain amount su?icient to
cause the direct current relay Pw included in the
tion battery, whenever the voltage of the latter
has dropped below a pro-arranged level. The bell
L could also be directly operated from a contact
secondary circuit of the transformer T to be re
leased. The consequence is that the relay Pw
of relay Pg so that the response thereof would
be independent of the release of relay Pw.
What is claimed is:
closes its back contact pw. If the voltage of the
storage battery has been adequately high, the
relay Pg has responded and keeps also its contact
pg closed.
The converter GW, as a result, is start
ed and generates an alternating current voltage.
A short while after connection of the converter
GW the relay S connected in parallel thereto will
be caused to respond and operate, closing its con
tacts sl, s2 and s5 and changing over its make
15 and-break contacts 33 and $4 to make connection
to converter GW. The radio frequency apparatus
HF will then be fed from the station battery by
way of the converter GW and the contacts 83 and
34. At the contact s2 is made a response circuit
for the relay U so that when the relay Zt has not
yet responded, and relay M at contact vi and
contact pm is disconnected from the supply cur
rent source. Relay U responds, makes its contact
ul , with the result that relay V is caused to oper
25 ate, the latter, in turn, closing its contact 212. At
the contact 1.52, the relay Pw supervising the line
voltage has been connected to the works poten
tial, with the result that the same has a chance
to become re-energized. But previously by way
30 of the contact 35, contact 712, contact m, the back
contact 3320 had been bridged, with the result
that also the shifting over of the contact M and
the renewed responding of the relay Pw occa
sioned thereby will be unable to lead to the dis
35 connection of the converter GW.
After a certain interval of time the response
time-lag relay Zt, after expiration of lag of a
mechanical or thermal time measuring means op
tionally attached thereto, is caused to respond
and to break at its contacts at the response cir
cuit for relay U. As a result, the said relay U is
caused to open its contact ul and it connects at
its contact 2L2, while in back position, the ener
gized relay Pro with the transformer T and thus
the power line N. During the brief length of time
it takes contact u to shift, the ?eld in the relay
Pw is maintained, so that the relay is again
merely called upon to determine whether the
power line will furnish sufficient potential in
50 order that it may keep connected therewith.
After the relay U, by opening of contact at has
been released again and as a result also the relay
V, and after relay Pw has been caused to respond
again, relay M is caused to respond, that is, from
minus by way of contacts pw, 1L3 and contact 21!
to plus. Relay M is provided with a slight time
lag response; it responds after a certain while,
and it breaks at its contacts m the holding circuit
for the relay S and the circuit of the converter
60 GW so that the latter is disconnected again.
If, however, after the relay Pw had been re
connected with the power line, it was released
again, the consequence would have been that the
converter GW would not have been disconnected
65 because in this instance relay M would have been
unable to fully respond, so that the feed circuit
for the converter GW would have been preserved.
A state of non-operativeness of the storage or
station supply source E is brought preferably to
70 the attention of the supervising personnel in the
station by that some alarm device such as a bell
L which is actuated by the aid of the contact pg
serving as a voltage supervisor relay for the sta
1. A circuit arrangement of auxiliary supply
sources for wired radio apparatus normally con
nected to a main supply line, comprising an aux
iliary source of voltage, a main line relay which 10
serves to supervise and test the line voltage,
means for causing said main line relay to respond
when the line voltage has dropped below, or has
exceeded, a certain level, said means comprising
a time delay mechanism cooperating with a plu 15
rality of contacts to repeat the test at de?nite
time intervals, and provides re-connection to the
supply-line voltage which will be effected only
when the voltage-supervisory relay has stayed a
certain length of time in a state corresponding to
the normal main line voltage.
2. An arrangement according to claim 1, with
this characteristic feature that the relay super
vising the line potential is always re-connected to
the power line when the relay windings are in a
magnetic condition which corresponds to the nor 25
mal state of line voltage.
3. An arrangement according to claim 1, with
this characteristic feature that the relay super
vising the power line potential, after it has been 30
caused to release, is connected with an auxiliary
voltage, and that it is re-connected with the
power line in attracted state.
4. An arrangement according to claim 1, with
this characteristic feature that the auxiliary
source of current is subjected to supervisory ac
tion from a distinct relay, a current converter
device being connected so as to be made a func
tion of the said relay, after release of the relay
supervising the power-line potential.
5. An arrangement according to claim 1, with
this characteristic feature that the voltage state
of the converter, is supervised by a further relay,
and that the emergency source of current is con
nected With the apparatus to be fed only when
the converter has reached the proper operating
6. A circuit arrangement for auxiliary supply
source of apparatus normally connected to a main
line' supply source, comprising a main line relay
coupled to said main line supply source, an aux
iliary battery supply source, a second relay con
nected to said auxiliary supply source and said
main line relay, a time delay relay cooperating
with a plurality of contacts to provide a recon
nection to said main line supplyv after said aux
iliary supply has been connected to said appara
tus for a predetermined time providing said main
supply has again obtained its normal line voltage.
7. A. circuit arrangement for auxiliary supply
source of apparatus normally connected to a 60
main line supply source, comprising a main line
relay coupled to said main line supply source, an
auxiliary battery supply source, a recti?er, a sec
ond relay connected to said auxiliary supply
soiu‘ce, said recti?er and said main line relay, a
time delay relay cooperating with a plurality of
contacts to provide a reconnection to said main
line supply after said auxiliary supply has been
connected to said apparatus for a predetermined
time providing said main supply has again ob 70
tained its normal line voltage.
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