TRANSMISSION OF PULSES FOR TELEMETERING TOTAL POWER WITH HIGH-FREQUENCY CURRENTS ALONG A HIGH-VOLTAGE LINE

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600350137-1
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 4
• Document Creation Date: December 22, 2016
• Document Release Date: August 22, 2011
• Sequence Number: 137
• Publication Date: October 3, 1950
• Content Type: REPORT

Sanitized Copy Approved for Release 2011/09/14: CIA-RDP80-00809A000600350137-1
CLASSIFICATION CONFIDENTIAL I VNFIU I IAL
CENTRAL INTELLIGENCE AGENCY REPORT
INFORMATION FROM
FOREIGN DOCUMENTS OR RADIO BROADCASTS CD NO.
COUNTRY USSR
SUBJECT Scientific - Electricity, telemetering
HOW
PUBLISHED Monthly periodical
WHERE
PUBLISHED Moscow
DATE
PUBLISHED Feb 1950
LANGUAGE
by TA9 UNITED STATES WITHIN THE HEARING OF KIPIONASK ACT 90
U. Al A....... ITS TRANSMISSION 04 Till ERTNUITION
ITS CORTSNTS ~N ANT WARNER TO Al UNAUTHONISSO PERSON IS PRO-
0;
HISITSO my LAW. NIPNOSUOTINR Or THIN room is rsomis UD.
DATE OF
INFORMATION 1950
DATE DIST. 3 64'1950
NO. OF PAGES 4
SUPPLEMENT TO
REPORT NO.
THIS IS UNEVALUATED INFORMATION
TRANSMISSION OF PULSES FOR TELEMETERING TOTAL POWER
WITH HIGH-FREQUENCY CURRENTS ALONG A HIGH-VOLTAGE LINE.
.Engineer, M.L.. Bunevich
figures referred to are appended]
In the Molotovenergo system, a telemetering apparatus which transmits
total-power telemetering pulses by hf (high-frequency) currents along a
high-voltage electric' transmission line has been constructed and put into
service.. It uses an existing hf telephone communication channel, without
adapting it for the frequency at which telemetering takes place.
Figure 1 shows the method of connecting the VChA-2 transmitter at the
transmitting end to the hf telephone communication channel.
When this method is used for connecting the VChA-2 telemetering pulse
transmitter to he hf lead-in of the DPK-20 receiver-transmitter at the
transmitting end, it is possible for both transmitters to work simultaneously
without appreciable losses of hf power by the VChA-2 or DPK-20?transmitters
and without effects due to mutual interaction through the output circuits.
This is because two filters tuned to parallel resonance are inserted in
thht-- hf leakage path'from the DPK-20 traz tter to the VChA-2 transmitter.
One of them is for the frequency of 63 Nc radiates} by the DPK-20 transmittia;
the second for the incoming frequency of 91.5 kc.
Leakages of hf energy from the VChA-2 telemeterin pulse transmitters do
not occur because these. circuits, tuned to series Ci7 resonance at the
two extreme frequencies of 63 and 91.5 kc, are tuned to parallel resonance
for yms (root-mean-square) frequency. The VChA-2 telemetering pulse trans-
mitter works at this last frequency, which is practicall? 81.5 kc.
CONFIDENTIAL
1UHFIUtti Iki
Sanitized Copy Approved for Release 2011/09/14: CIA-RDP80-00809A000600350137-1
 Sanitized Copy Approved for Release 2011/09/14: CIA-RDP80-00809A000600350137-1
CONFIDENTIAL
A third series circuit, ehowninJFigure.1;, is tuned to the rise frequency
of 81.5 kc and serves as compensation for the characteristic impedance 'f
of the hf line 167 meters long and the reactance of the coupling condenser
through which the VChA-2 and DPK-20 transmitters are connected to the elec-
tric transmission line.
The system used for connecting the pulse receiver to the hf lead-in
of the DPK-20 at the receiving end is shown of Figure 2.
All that has been said concerning the method of connecting the VdhA-2
telemetering transmitter at the transmitting end applies to the method of
connecting,, the receiving device at the receiving end. In this case, the
method, in conjunction with the use of a pulse receiver of the given design,
makes it possible to?tune out completely any interference entering the
DPK-20 from the hf telephone communications channel at the receiving end.
An old hf instrument of the Laboratory imeni Smurov in Leningrad is
used as the VChA-2 transmitter. It was originally intended for use in
directional protection circuits with hf interlocking.
For the transmission of telemetering pulses by hf currents, the trans-
mitter was somewhat modified to increase its oscillation power. This modi-
fication consisted in connecting the Type TO-143 tube of the master oscil-
lator and the Type GO-5 reserve oscillator tube for permanent, simultaneous
operation in parallel with the existing tubes. After this modification,
its oscillating power was about lOw. In the future, it is proposed to change
a metal tubes with full supply from an At: line.
The.receiving device consists of a five-tube superheterodyne using
metal tubes operatikig on ac. The plate current of the Type 607 output tube
varies in time with the incoming hf telemetering pulses from its maximum
value to zero. In other words, during the pulse duration the plate current
falls to zero, but the full plate current flows throughout the pause between
pulses. A polarized relay is included in the plate circuit of this tube
which, following the plate current variations already mentioned, reproduces
the so-called secondary pulses, accurately repeating the primary pulses of
the transmitter.
This receiving device allows normal operation of the output receiving
relay when the hf current from the pulse transmitter changes from 315 to
15 ma. Thus, with respect, to the level of the incoming hf telemetering
pulses, the receiving installation has a reserve factor equal to 21. The
sensitivity of the pulse receiver, according to a standard signal generator,
is 18 microvoltg.
The primary pulses at the transmitting end are created by a three-phase
ac counter (meter) from which the counting mechanism has been removed. A
commutator-interrupter is mounted on the axis of this meter which interrupts
the supply circuit of the auxiliary coding rrelay. One turn of the meter
disc produces six makes and six breaks of the relay's supply circuit. The
code relay in turn, in time with the makes and breaks in its supply circuit,
makes and breaks the plate supply circuits of the VChA-2 transmitter, thus
providing for its pulse operation.
The current windings of,the three-phase meter, which creates the
primary pulses, are connected to the secondary windings of the integrating
current transformers,' whose primary windings are by-passed by the secondary
current from the current transformers of the oscillators. The voltage wind-
ings of the transmitting element are connected to the secondary voltage of
the voltage transformers.
CONFIDE TL L
Sanitized Copy Approved for Release 2011/09/14: CIA-RDP80-00809A000600350137-1
 Sanitized Copy Approved for Release 2011/09/14: CIA-RDP80-00809A000600350137-1
CONFIDENTIAL
50X1-HUM
. As the receiving device is installed at a substation 5 km from the
dispatching point, a connecting line was needed. The connecting line be-
tween the central control switchboard and the substation switch board was
used for this purpose. The current pulses from the output relay of the
receiving device are applied to the midpoint of the differential trans-
former at one end of this line and act on a polarized relay (through
another differential transformer) connected at the other end. The relay
contacts are connected to the circuit of the indicating instrument through
condensers of fixed capacitance. The charging current for these condensers
and, consequently, the readings of the indicating instrument, is directly
proportional to the freguency.of the pulses.
Figure 3 is a schematic diagram showing how the output relay of the
receiving-device is connected with the pulse converter through the con-
necting line.
This method of combininz the transmission of telemetering pulses of
total power and hf telephone communication along one channel, accomplished
vithout supplementary redesigning of the existing hf telephone communica-
tions'channel, resulted in great savings. The long-distance telemetering
system described operates along the same channel .with the hf telephone
circuit uninterruptedly and without interference.
Appended figures follow)
CONFIDENTIAL
CONFIDENTIAL
Sanitized Copy Approved for Release 2011/09/14: CIA-RDP80-00809A000600350137-1
 Sanitized Copy Approved for Release 2011/09/14: CIA-RDP80-00809A000600350137-1
-1
CONFIDED TL!
V C h A-Z
Figurr I
n pre 2
Co::.,>I_ S y- rev
T switchboard
of Cenfra/
Con1ho/ s>.160"
Line
Transformer
,i j___ . 4I1I1Is.I
LEGEND
h Nigh Frequency
FR = Po%rired Ra/a}~
Ts Pp = rd/ Dispolbl~inq Point
V s e ipq 7 r1I)le!/f'
TS S et/ ~Co St roll
figure 3
_4 -
Receiving SuWetiow
CONr1BEN 1I4L
tine
Transformer
Sanitized Copy Approved for Release 2011/09/14: CIA-RDP80-00809A000600350137-1