ALTERNATING CURRENT NETWORK ANALYZER AT THE POLYTECHNIC INSTITUTE IN WROCLAW

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80S01540R005600040013-8
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 23
• Document Creation Date: December 27, 2016
• Document Release Date: March 22, 2013
• Sequence Number: 13
• Publication Date: June 23, 1954
• Content Type: REPORT

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CENTRAL IN
I N FO RMAT
TEL.LIGENCE AGENCY
ION REPORT
This Document contains information affecting the Na-
tional Defense of the United States, within the mean-
ing of Title 18, Sections 793 and 794, of the U.S. Code, as
amended. Its transmission or revelation of its contents
to or receipt by an unauthorized person is prohibited
by law. The reproduction of this form is prohibited.
50X1-HUM
Alternating Current Network Analyzer
at the Polytechnic Institute in
Wroclaw
REPORT
DATE DISTR.
NO. OF PAGES
REQUIREMENT- NO.
REFERENCES
THE SOURCE EVALUATIONS IN THIS REPORT ARE DEFINITIVE.
THE APPRAISAL OF CONTENT IS TENTATIVE.
(FOR KEY SEE REVERSE)
loriginal and a translation of an article written in
Po ing the alternating current network analyzer which was constructed
by he Labor for for Pr tot es of Electrical Measuring Devices in
Warsaw. The article was published in the Polish
technical monthly, Eneretyka No. 4/1952.
ri
STATE IARMY I INAVY I IAIR FBI AEC
LA
50X1-HUM
50X1-HUM
50X1-HUM
OCD Ix
(Nob: Washington Distribution indicobd? By "X"; Field Distribution by "#".) Form No. 51-61, January 1953
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THt AL.TRNATING CURRENT NETWORK ANALYZER AT THE ELECTRIC 50X1-HUM
POWER LABORATORY OF THE POLYTECHNIC INSTITUTE IN WROCLAW
(POLAND)
Introduction
1. The growing industrialization of Poland and the demand
for electric energy connected with it have posed many
difficult electric grid problems for Polish experts in
this field. A q ick solution was required for these
problems. ;Dr.)J.\~OZUCHOWSKI, a professor at the Poly-
technic Institute Wroclaw, in attempting to find a
solution, thought o constructing an alternating
current network analyzer. In the autumn of 1949 the
design and the construction of such an analyzer was
ordered in the Laboratory for Prototypes of Electrical
Measuring Devices (PPAE) in Warsaw.
2. In the spring of 1950, after numerous difficulties con-
nected with organizing the construction of such large
equipment and obtaining the necessary materials, con-
struction of the analyzer started. Source designed the
analyzer, and s ervised its construction with the
assi ante of K.A LECKI in the mechanical assembly
and ANULAGOWSKI in the electrical connecting. Most
of the mponent parts were made in the PPAE. When the
parts were completed the analyzer was assembled in three
weeks and put into operation in February 1951. By
February 1952 the analyzer had been working almost
constantly for a year. Many measurements of the Polish
electric power grid and the development of new grid
conceptions had been made with the analyzer during
this time.
3. The importance of a continuous supply of electric
energy for factories and plants was clear to everyone
since a break in supply could cause considerable loss
to the national economy. The electrical engineers
who were in charge of the electric power grid to ensure
uninterrupted supply of electric energy to the cus-
tomers had to know the exact conditions under which the
power system operated. This was a simple problem at
the time of open and small closed networks. The solu-
tion of these problems was very simple mathematically.
However, after the electrical grids were expanded and
included numerous meshes and Junction points,.the,
problem was difficult to solve mathematically because
it required a solution using equations with many
.unknown quantities. Moreover, the equations were
different for each new condition of the network. The
transient phenomena of electrical grids further compli-
cated matters, because differential equations with the
same number of unknown quantities had to be used instead
of normal linear equations.
ENCLOSURE A
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4. These difficulties forced the scientists to find a new 50X1-HUM
method to solve this problem. The method consisted of
constructing a laboratory model of the analyzed electri-
cal network in which all the electrical quantities
would be replaced by corresponding scaled down quantities.
The model should have a versatile set of operating
conditions to accomplish many optional experiments such
as overloads, short circuits, breaks in the supply of
energy etc. and, in addition, would have many measuring
points which would be easily accessible. The alternating
current network analyzer was the resulting model.
In addition to the problems mentioned above it was pos-
sible to solve, with the analyzer, other problems which
were connected with the electric power grid as transient
phenomena, such as the influence of the particular loads
on the network, the best locations of new power sources,
etc. It was also possible to apply the analyzer to the
solution of many problems not connected with electricity
at all.
7. According to the calculations, the analyzer was to have
as many as 600 junction points. This requirement caused
many additional difficulties. In the first place, the
proper operating voltage and frequency had to be.chosen
to avoid the errors exceeding the assumed limits of the
analyzer accuracy. (Errors can be caused by the residual
resistance of the connecting wires and contacts, the
residual capacitance of wiring, and also they can depend
on the accuracy of the RCL model elements.)
Institute in Wroclaw
The Alternating Current Network Analyzer of theJP lytechnic
The maximum accuracy of the AC network analyzer was about
2%. This was completely sufficient for the electric
grid problems, since the data on loads, capacities, re-
sistances, inductances, etc. of a real electric network
were generally less accurate.
6.
8.
Secondly, considering the necessity of using a large
number of model RCL elements, it was necessary to apply
the separate RCL model elements instead of the decade
units. Consequently, a great economy of material and
space was obtained, since the RCL elements, which were
in operation, did not take up space in the analyzer.
In addition, they could be used for modeling another
part of the network. After experimenting it was possible
to model, because of the above-mentioned system, three.
or four given networks simultaneously. The next very
important point was the possibility of.measuring quickly
comA1
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any necessary electrical quantity at any point of the
model network; this had to be accomplished in a way
which ensured no error. It was accomplished by the
total automatization of the measurements. After slight
training, it was quite easy to measure in about 40
seconds all the basic quantities such as active power,
reactive power, current, the voltage and phase angle of
the current, and the voltage. There were 1,841 measur-
ing points in the analyzer. The time necessary to con-
nect the measuring instruments to any point of the
model network was no longer than four to five seconds.
General Description
9. The analyzer consisted of two basic parts. The first
part was a steel frame of 10.5 x 2.2 x 0.45 M. (32 ft.
long, 6 ft. 9 in. high, and 18 in. deep). The frame
was divided into 1,196 cells destined to place the
"line" and "load" units. There were also 23 model
generators placed in the frame. The other part was the
measuring table. Its dimensions were 1.8 x 1.0 x 0.6 m.
(6 ft. long, 40 in. high, 24 in. deep). The entire
analyzer was placed-in a room 12 x 7.5 m. (40 ft. long
and 25 ft. wide).-- ee Figure 1, Enclosure B_] The
control devices and meters of the model generators were
placed on the front of the analyzer frame. The cells
of the "line" units and of the ;load" units were
accessible from the back of the frame.
10. The three-phase grid at 110 kv line voltage with the
maximum input power of 150 kva for each individual
supplying point was considered the base for determining
the electrical quantity scale of the analyzer, since
such a grid had been the one mostly frequently analyzed
(with the analyzer). After studying and calculations,
the following scale was adopted:
Values. in the Corresponding Values
Real Grid in the Model Grid
Rated voltage
110 kv
63.5 v
Frequency
50 cps
500 cps
Tension
1 kv
1 3v
Current
1 a
0.2 ma
Power
1 mva
0.23 va
Resistance
1 ohm
5 ohms
Impedance
1 ohm
5 ohms
Reactive conductivity
1 mho
0.2 mhos
Inductance
1 mh
0.5 mh
Capacitance
1,000 mmf
20 mmf
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11. Resistors, inductors, and capacitors were used as the
line elements. These elements were placed in Bakelite
boxes with plugs. Figure 3, Enclosure Bj To set a
required model "line" unit of the individual RLC ele-
ments it was necessary to put them into one of the
special, small exchangeable "line" panels which had
corresponding sockets built in. These sockets were
connected in such a way that, after putting the RLC
elements and short circuit bars into the panel, a four
pole "pi"-network resulted. Input and output of this
'pi"-netz,uork was connected with the five-pin plug
'placed in one end of the anel. She circuit of the
pi"-network ("line" unit is illustrated in Figure 5,
Enclosure BJ The load elements were made similarly to
the line elements ffigure 3, Enclosure B7 but to
avoid mistakes, the Bakelite boxes were of a different
color. To set a required load, the proper load ele-
ments were put into the corresponding sockets of a
"load" panel. +'igure 6, Enclosure Bj The analyzer
had 598 cells for the "Line" units and 598 cells for
the "load" units (junction points). These cells were
numbered and had corresponding sockets connected with
the measuring system. Each "load" cell had also a
Bakelite strip with four binding posts representing a
corresponding junction point.
12. When setting a model network it was first necessary
to draw a plan of the electrical network to be measured
marking the lines, the junction points, the loads, and
the generators with the corresponding numbers of cells
and model generators. Then the electrical quantities
of the lines, loads, and other component parts of the
real network would be determined on the model scale.
After the above procedure it was possible to begin
modeling. The first step was to place the correspond-
ing RCL elements and "load" elements into the proper
"line" and "load" panels. These "modeled" panels
would be connected with the flexible insulated wires
regarding the plane after pushing them into the corres-
ponding cells which were marked with their proper
numbers on the plan. Then all of the connected
generators would be set approximately according to
the plan. At this point test measuring could start
during which generators and autotransformers would
be adjusted several times to obtain the given power
value of each generator.
The Model Network Elements of the Analyzer
13. The model network elements include the following:
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 ~.ss.na:an[a^.T, ,Tr- A A I
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Resistors
Inductors of X/R =5
Inductors of X/R =30 to 50
Capacitors
Autotransformers
Compensators
Actual loads
Inductive loads
a. The resistors were manufactured in units of .5, 1,
2, 4, 7, 10, 20, 40, 70 ohms. The system of 1, 2,
14, 7, was applied because only this system allowed
the composing of each whole number from 1 to 10 (and
even to 11) using only two units. It was possible
to obtain any quantity between 1 and 110 ohms with
an accuracy of 1 ohm using only 4 of these elements.
In many cases the accuracy could be increased by
adding a .5 ohm element. The elements were made
with an accuracy of resistance of'=.5%. The resis-
tors were wound of constantan wire by a method
which ensured neglegible inductance. The maximum
working current for an element was .3 A.
b. The inductors were made in the same way as the
resistors. They were made in 2, 4, 10, 20, 40, .70,
100 and 200 ohms units (at f =500 cps.) as copper
wire coils with iron dust cores. The accuracy of
inductance was1 l%. The inductance 'varied with the
current about 1% at maximum current. These induc-
tors were of Q ;5 which was considered.a small
geometric size of these elements. In cases needing
better Q, the elements described below were used.
c. The inductors of Q = 30 to 50 Figure 7, Enclosure 7
were used to model the equivalent transformers and
generators of the real grids. These elements were
made in values from 2 to 200 ohms. Between 2 and
20 ohms they were made in steps of 2 ohms; between
20 and 200 ohms the steps were 20 ohms. This system
allowed the composing of any reactance between 2
and 220 ohms only of two elements with an accuracy
of 2 ohms. These elements were made as tA'roidal
coils on the.iron dust cores. The accuracy of induc-
tance waste' 1%.
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50X1-HUM
d?, The capacitors were in values of .5, 1, 2, 4, 7,
10, and 40 ohms : They were made of silvered and
molded Bakelite mica condensers. The accuracy of
capacitance wa s -r 11%6.
e. The following data pertains to the regulated auto-
transformers:
Maximum load ............ 15 va which corresponded to
220 mva in the real 110
kv grid
Range of regulation ..... *-20% to -30% in steps of 1%
No-load loss ............ about .4%
Maximum efficiency ......about 99.3%
The autotransformers could be used to match the
rated voltages for the loads or as the,grid inter-
mediate transformers.
f. The compensators were made of styroflex and of mica
condensers in values corresponding 1, 2, 3, 4, 5, 6,
7, 8, 10, 20 and 30 mvAr at 110 kv.
g. The active loads elements (pure resistance) were
made in number of -600 units in 'values corresponding
at 110 kv to the power between 1 and 10 mw in steps
of 10 mw.
h. The inductive loads elements were made at X/R= 5_
(cos= about .2) in the same 'values as the active
elements, but the upper limit was increased to 100
mvAr. The elements described in Subparagraphs g.
and h. were placed in the Bakelite boxes as were
.the line elements, but the boxes were of another
color to distinguish one from the other.
The Generators
i4. Each of the 23 model generators could replace a ,real
generator or power plant of the maximum power 150 DIVA
at the rated voltage 110 kv. This power corresponded
to 10 va at 63.5 v rated voltage in the analyzer. The
generators worked in the circuit of two coupled phase
shifters Figure 8, Enclosure B. connected as illus-
trated /Figure 9, Enclosure B. The rotation of the
coupled rotors gave continuous voltage control between
20 and 90 v. The adjustment of the phase angle was
contvolled by the dial placed on-the front panel of the
C ON
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generator. Figure 10, Enclosure B_] The accuracy of
the adjustment was about t20 minutes. The voltage was
controled with an accuracy of * 3`' by the copper oxide
rectifier voltmeter also placed on the front panel of
the generator. It was necessary to connect each genera-
tor to the main measuring system to get a better accuracy
of the voltage. The course control of the generator
current was accomplished by the copper oxide rectifier
ammeter which could be connected temporarily by a push-
button switch. A short circuit was normally placed on
each ammeter to avoid the undesired voltage drop. The
inductance of the generating system was compensated with
a corresponding condenser C. It was made to avoid the
phase shift at the active load. The generators were
supplied from the common line 3 x 40 v - 500 cps.
The Measuring System
15. The analyzer was one of the largest AC analyzers in the
world. As mentioned above, so great a number of measur-
ing points made it necessary to design a system which
allowed the measuring system to be quickly connected to
any measuring point of the analyzer. At the same time
it was essential that this problem be accomplished with
regard to the low capacitance and low resistance of the
connecting wires and elements.
16. The "calling" system of the measuring points was accom-
plished by telephone type relays. Siemens type, double
contact "flat" relays were used to ensure good results.
A special "cascade" connecting system of relays was
used to decrease the residual capacitance of the "hang-
ing" contact springs. This system gave in the poorest
instance only 26 parallel connected contact springs
which gave about 260 mmf residual ground capacitance,
since a single contact spring had only 10 mmf ground
capacitance. To the contact sprin~ capacitance add the
capacitance of the sockets in the line" and "load"
units, the capacitance of the measuring current and
voltage transformers, the capacitance of the wiring and
the coaxial cable which connects the measuring table
with the analyzer frame. Considering this, the sockets
in the "line" and "load" panels were made of very low
capacitance; this was obtained by partial air insulation.
The measuring transformers also had a very low capaci-
tance between the windings and against the ground. All
wiring was arranged in a special way to ensure the mini-
mum capacitance. As a result the total residual
capacitance was only 1,700 mmf for the most remote
measuring point which gave the loss of power only 20
mvAr (corresponding about .3 mvAr at 110 kv)..
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CONFIDENTIAL
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17. The residual resistance was. also 'very small. -Its value
was about .8 ohms for the most remote measuring point.
It gave a 20 mw loss of power (corresponding .3 mw at
110 kv) at maximum current 160_.mA. These residual
values were neglegible in the measurements because they
were below the accuracy of the real electric grids.
18. The following points of the analizing network were.
accessible to measurement:
a. The left side of the "pi"-network......... 598 points
(current measuring)
b. The right side of the "pi"-network........ 598 points
(current measuring).
c. The junction point .......................... '--',98 points
(voltage measuring) -
d. The ground potential ...................... 1 point
(voltage measuring)
e. The generators: voltage measuring ........ 23 points
current measuring.... . 2 points
Total..184l points
19. Each of these points was served by a relay (so-called
"unit" relay). The relays which connected the voltage
points had only to connect the required model network
point to the measuring system. The relays serving the
current measuring points had to break the circuit being
measured and to connect the current measuring system
across the broken terminals. The relays were divided
into three groups each of 600 units. Two groups were
"current" groups; one was the "voltage" group. All of
the relays were mounted in the 23 steel racks which were
placed behind the generators on the back of the analyzer
frame. The relay racks without cover are visible in
the upper part of Figure 2, Enclosure B_]
The Measuring Table
20. The measuring table figure 11, Enclosure B_] of 1.8 x
1.0 x o.6 m. (6 ft. long, 40 in. high and 24 in. deep),
was the brain of the analyzer. It included the follow-
ing parts figure 12, Enclosure B.:
a. The measuring system which consisted of*.'
CONH ' JTLL1
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(1) Three electrodynomometers which measured the
voltage, the current, and the power.
.(2) The voltage and the current amplifiers.
(3) The DC power supplies for the amplifiers.
(4) The constant voltage transformers.
(5)The calibrating circuit.
(6) The cathode ray tube with the corresponding
amplifier and the phase shifter to measure the
current and the voltage phase angle.
(7) The voltage measuring transformer and the
voltage divider.
b. The calling and signaling system with the rectifiers
giving 24 v DC to supply the relay circuits and the
24 v transformer to supply the signal lamps.
21. The electrodynomometers were in a horizontal position
under a glass plate in the middle front of;the table.
Their scales were lighted. The operating panel was
placed a little above. The push buttons operating the
analyzer were placed on it. The light control signaling
plates were above and on both. sides of the operating
panel. The cathode ray tube with the phase shifter for
-measuring the phase shift was on the right side of the
measuring table.
The Measuring System
22. The analyzer measuring system was designed to measure
the following quantities:
a.
The current in both branches of each "pi"-network
and in each generator
b.
The voltage between each junction point and the ground,
or between each generator and the ground
c.
The voltage between any two junction points, genera-
tors, or generator and junction point
d.
Active or reactive power. as the result of any combi-
nation of the above mentioned voltages and currents
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e. The phase shift of any current or voltage in respect
to the basic voltage which has no phase shift in
comparison to the generator voltage set on 00 of the
phase angle.
f. Impedance indirectly according to the following
formula:
Z=R+ jX
active power. reactive power
-t j
I I 1 12 __
23. The electrodynomometers which were used on the measuring
table were of the astatic type with an accuracy of Z .5%
for the voltage and the current measuring. The power
measuring accuracy of the meter wart .2%. All of these
meters gave the full scale at a current of 20 mA. The
moving and the standing coil of the ammeter were connected
in series. The coils in the voltmeter were connected
in series with the voltmeter, and its standing coil
connected in series with the ammeter. The meters, of
course, could not be directly connected to the model net-
work since their considerable consumption of power would
have resulted in completely false measuring. The values
of the power appearing in the model network were considered
extremely low.
24. To avoid having the meters influence the model network,
two measuring amplifiers were applied. One was used in
the current measuring system, the other in the voltage
measuring system. The current amplifier was a three-
stage amplifier with which was used a special kind of
negative feedback. Because of that the phase shift
between the input voltage coming from the current shunt
and the output current was within 10" which was addition-
ally compensated. Also the amplification was almost
independent on the variation of the AC main voltage and
the characteristics of the tubes used in the amplifier.
The amplifier gave the full scale of the meters at 50 my
input voltage. The input voltage came from the symetri-
cal current measuring transformer with the ratio of 1:5.
The transformer winding of a smaller number of turns was
connected across the variable shunt selected by the range
relays. There were 9 full scale ranges: 1,000, 500,
200, 100, 50, 20, 5 and 2 ma. The voltage drop on the
shunt for each range was 10 my at the full load.
25. The other amplifier was similarly constructed and was
designed. to work in the voltage measuring system. The
full scale was'obtained at the .5 v input voltage
directly impressed to the grid of the first amplifier
tube. Because the input voltage came through the sym-
metrical voltage measuring transformer with the ratio of
10:1, the full scale of the meter was obtained at the
lowest input voltage of 5. v.. .._Between the transformer
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and the first amplifier tube the voltage divider was
placed; it had five selected full scale ranges: 100,
50, 20, 10 and 5 v. The input impedance of the voltage
measuring system was 2 m constant for each range.
Between the input stage and two following stages of the
voltage amplifier, a resonance circuit tuned for 500
cps was placed. It was designed to obtain the 90? phase
shift at reactive power measuring. he general circuit
of the analyzer measuring system is illustrated in
Fibure 13, Enclosure B,7 Each of the amplifiers had its
individual power supply and a constant voltage trans-
former.
26. The maximum total error of the measuring system did not
exceed t' 11,%
27. The measuring system could be calibrated at any time by
the 500 cps calibrating voltage which was impressed
through the corresponding voltage divider to the input
circuit of both amplifiers at the time of calibrating.
The calibrating voltage came from a bridge circuit
formed of two constant resistors and two thermistors.
The bridge was arranged in such a way that the input
voltage variation of! 20% caused only1.5/5) 'variation of
the input 'voltage.
28. A cathode ray tube with the corresponding one-stage
amplifier with gain control and an inductive phase
shifter with the 3600 scale were used to measure the
phase shift. The accuracy of the phase shift measuring
was better than' 20' .
29. After one year's experience the total error of the
analyzer did not exceed' 20. Thus, the accuracy of this
analyzer is not less than the accuracy of the known
analyzers of other countries.
The Calling and Siznaling System
30. The whole operation of connecting the measuring system
was accomplished by push-button switches mounted on the
operating panel which was placed horizontally on the
.top part of the measuring table. Calling the required
measuring point was accomplished in the following way:,,
after setting the analyzer to work, one of three group"
push buttons was pressed. The push buttons were.marked:
CURRENT A (which served 598 current measuring points of
the left branches in the line S?pi"-networks), CURRENT B
- GENERATORS (which served 598 current points of the.
right branches in the line "pi"-networks and 23 current
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measuring points of the generators), and VOLTAGE (which
served 599 voltage measuring points - junction points -
and 23 generator voltage measuring points). Then one of
the required points in the chosen group was called by
pushing the corresponding three push buttons from the
ten "calling" push buttons marked with the figures 0 to
9. After a current point was called, it was possible to
switch the "calling" push buttons to the 'voltage group,
and to call a voltage point by pressing the VOLTAGE
"group" push button which did not cancel the previously
called current point. It was necessary to connect two
points of the model network system for measuring voltage.
One of these points could be the ground potential. Six
push buttons from the "calling" buttons had to be pushed,
one after another, to accomplish the measurement. The
first three connected the first voltage point and the
following three connected the next point.
31. All operations were controlled by lights on the glass
plates placed on both sides of the measuring table. The
connection of the measuring system to one of the groups
of the measuring points was signaled first. Next came
the lighted figures controling the ordinal number of the
called point. At last the control lamp lights signaled
that the corresponding "unit" relay acted. This relay
connected the measuring point directly to the measuring
system. In addition, there were the lighted control
signs indicating whether or not a generator or junction
point was measured and other signs which gave the direc-
tion of the current and the voltage.
32. The entire calling system based on relays was so designed
that there was no possibility of connecting, for example,
two current points simultaneously. To call another
measuring point it was necessary to press only the proper
"group" push button. This operation canceled the last
connection and prepared the calling and the measuring
systems to call a new point.
33. After a required point was called, the meters had to be
set for the proper range. This.was accomplished by
pushing one of the nine "rane" push buttons for the
ammeter and one of the five range" push buttons for the
voltmeter. The change of ranges was signaled on the
lighting plate placed above the calling panel. The
lighted signs gave, each time, the number of the milli-
amperes, volts, watts or VArs (reactive power units) per
one grade of the instrument scales. This helped the
analyzer operator, because, after several hours of measur-
ing, he was tired and could easily make a mistake by
taking the improper range. Canceling a connection with a
CONMENTIAL
Declassified in Part - Sanitized Copy Approved for Release 2013/03/22 : CIA-RDP80S01540R005600040013-8
 Declassified in Part - Sanitized Copy Approved for Release 2013/03/22 : CIA-RDP80SO154OR005600040013-8
JAL
.-13-
measuring automatically sets the instruments in the
least.sensitive range to avoid possible damage in
the event of a new connection.
34. Besides the devices, mentioned above, there were
additional push buttons on the measuring table with
which to change the current direction, to set the
power meter from active to reactive power measuring,
and to connect the measured voltage or current to
the phase shift meter. There was also a .special
push button for giving the calibrating voltage for
the calibration of the instruments. After pressing
that push button all of the instruments gave full
scale. The special potentiometers, tuned by a
screw driver, permit correction of eventual differ-
ences. The potentiometers were placed under the
operating panel.
35. The details described above show that the analyzer
was designed with particular regard to obtaining
the greatest automatization and accuracy in measur-
ing. It was made in a way to allow the operator to
give his complete attention to reading the instru-
ments.
The Power Supply
36. The power supply consisted of a 500 va,three-phase
generator working at the frequency 500 cps. The
rated voltage of the generator was 3 x 140 v. After
the generator was placed the three-phase low pass
filter cutting the harmonics until .8;0. Then the
voltage was reduced by the corresponding transformers
to 3 x 40 v. This voltage fed the common three-
phase line supplying the model generators. This
supply was provisory, because in the Laboratory of
Electric Prototype Devices in Warsaw a special 500
cps. three-phase power generator of 10 kva was in the
last stage of construction. This generator was to
have the electronic stabilization of?the voltage
and the frequency with an accuracy of .l 0 of both.
The generator would be driven from a special direct
current motor which was being constructed in the
same laboratory.
Declassified in Part - Sanitized Copy Approved for Release 2013/03/22 : CIA-RDP80SO154OR005600040013-8
 Declassified in Part - Sanitized Copy Approved for Release 2013/03/22 : CIA-RDP80SO154OR005600040013-8
b'u1J LL's 6f~.
Descriptions of illustrations in the enclosed Polish text_
50X1-HUM
Figure .1: General view of the alternating current network
analyzer.
Figure 2: Rear view of the alternating current network
analyzer.
Figure 3:
Figure 4:
Figure 5:
Figure 6:
Figure 7:
Figure 8:
Figure 9:
Figure 10:
Figure 11:
Figure 12:
Figure 13:
The model network elements.
The line panel with model p network.
The circuit of p network.
The load panel.
Inductors with high Q.
The coupled generators face shifters.
The circuit of model generator.
The front plate of the model generator.
The measuring table.
Rear view of the measuring table.
General circuit of measuring system.
Declassified in Part - Sanitized Copy Approved for Release 2013/03/22 : CIA-RDP80SO154OR005600040013-8
 . r 34.. xLSt;_.