THE HIGH FREQUENCY TELEPHONE SYSTEM OF THE SLOVENE STATE POWER PLANTS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP82-00457R002900680009-1
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 5
• Document Creation Date: December 14, 2016
• Document Release Date: October 13, 2000
• Sequence Number: 9
• Publication Date: July 15, 1949
• Content Type: REPORT

Approved For Release 2001/03/05 CIA-RDP82-00457R002900680009-1
Approved For Release 2001/03/05: CIA-RDP82-00457R002900680009-1
 CLASSIFICATION /CONTROL - U. S. OFFICIALS OT1L 1
Approved For ReIe~Rf4p9~TEL[Q~EN~E -AGENCY2-00457RO029006
REPORT NO.
INFORMATION REPORT CD NO.
COUNTRY Yup;oslavia
SUBJECT The Hirh Frequency Telephone
ystem of the Slovene State
'rer Plants
PLACE
ACQUIRED
ILLEGIB
STATE
ARMY
25X1A
AT DISTR.,
OF PAGES 2
NO. ENCLS. diagro ns
(LISTED D BELOW)
SUPPLEMENT TO
REPORT NO. 25X1X
transformer stations are connec e x
by two systems or p requeney e e41
oh
thong lines. The first system was installed by the Germans during the
ar. It is equipped with modern Siemens-Halske automatic exchange equip-
iient (Waehlersystem), and it connects the hydro-electric plant at Dravo-
r'ad the caloric plants at Velenje and Trbovlje, and the DES central
administration in Ljubljana. This system is inefficiently operated be-
~anse of a shortage of qualified personnel and equipment. The second
7~ystem,built by the Brown-Boveri Company, was installed before the second
world war. It, connects the hydro-electric plant at Fala near Maribor,
the caloric plant at Trbovlje, and the transformer stations at Radvanje
fnd La& o, The equipment of this system is in poor condition,,
.n ordinary local telephone line connects the transformer station at
asko with the caloric plant at Rajhenburg and with the DES office In
::>:a rell,and a similar telephone line connects the caloric plant at Ve]enje
with Slovenlgradec, Gustanj and Mexica. The relay station connecting
the first and second systems is located in Trbovlje. The relay station
onnectinc the first system and Velenje-Slovenjgradec.Gustanj_Mezica
?elephone line is the caloric plant at Velenje. The relay station between
the transformer station at Lasko serves as the relay station connecting
he second system and the Lakso--Rajhenburp-.Zagreb telephone line. These
e]ay stations are used pause of the weak transmission_
ion. The conde> eeris flanked byuiiaavyd
The DES high frequency telephone net for internal communication uses one
,1` the h.iph tension overhead transmission lines. The telephone apparatus
is separated from the overhead line by a condenser which suitably adapts
.he overhead line voltage, At both ends of the overhead line used for
:igh frequency telephone and transfer of energy, there is a "Drosselspule"
(high frequency choke) which prevents high frequency currents from entering
.be switching device (stikal a naprava) and transformers. High frequency
currents are transferred by/condenser which is located in front of the choke
;arid is connected by a high frequency cable to the telephone apparatus,
fisua lr located in the command roow of the power plant or transformer sta.-
 oved FoARPMVM /A3M5s.Qi*-2eW57R0029f 1Op009-1
INTELLIGENCE AGENCY
installed in the open air distributing device (prostozracna razdelilna
naprava) when the voltage of the overhead line is more than 60 W. and in
the switch-house (stikalnica) when it is less than 60 kV, The.cylinder-
shaped choke consists of thick copper windings and variable condensers which
are adjusted according to the reverse frequency of the high frequency tele-
phone. The condenser is used to separate the overhead line voltage from the
telephone apparatus, and it transfers only the high frequency currents used
for telephones. The dimensions, shape, and location of the condenser Tare
governed by the voltage, but it is.usually cylinder-shaped, with the outer
part porcelain. The dimensions of a 110 kV condenser are 150 cm in height,
and 50 cm. in width. A heavy duty fuse is installed near the condenser,-in"i
a prism-shaped sheet metal box and the high frequency cable which is metal-
coated connects the condenser. The high frequency telephone apparatus which
is of varying dimensions. Larger plants have automatic telephone systems whereas
smaller plants are provided with local battery systems..
MNWP#CONTROL - U. S. OFFICIALS ONLY
------------
nacu -ent ~Tn s
Approved For Release 2001/03/05: CIA-RDP$ -00457R002900680009-1
~~ror
 Approved Fl J4~O1IO3IO5 : C , pfp20(&457ROO29 O6 A 09-1
NTROL - U. S. fl -%Yl 9r
saw* RAL INTELLIGENCE AGENCY
HIG l~ 'Y TELEPHONY OF D.D.S. ELECTRO-OBJECTS
JAS I C DI AGRAM" OF HIGH FREQUENCY TELEPHONE APPARATUS OWN'NECTION
TO DISTRIBUTING,E)EV I CE
?r TRANSFORMER.
H. F. TELEPHONE
APPARATUS
BASIC DESIGNE OF CONNECTION TO OVERHEAD TRANSP,M!ISSION LINE
Approved F la WOt/IY3/(5 : P 0457ROp2$b68O
HIGH VOLTAGE OVERHEAD
TRANSMISSION LINE
 d. F J' I 001/03/05 : CIA-RDP82-00457R002900680009-1
COI FIDENTIAIs
rC ONTROL - -11.. S* OFF IC IAL8 ONLY
Approved" For Release 2001/03?05 :. C.IA-RDP82-00457POO2900680Q09-1