THE PROBLEM OF HIGH-VOLTAGE CABLE INSULATED WITH ELEGAS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600310060-0
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: August 12, 2011
• Sequence Number: 60
• Publication Date: May 11, 1950
• Content Type: REPORT

Sanitized Copy Approved for Release 2011/08/17: CIA-RDP80-00809A000600310060-0
CONFIDENTIAL (wn FI E 1IAL
CENTRAL INTELLIGENCE AGENCY REPORT
INFORMATION FROM
FOREIGN DOCUMENTS OR RADIO BROADCASTS CD NO.
COUNTRY USSR
SUBJECT Scientific - Electricity
HOW
PUBLISHED Thrice-monthly periodical
WHERE
PUBLISHED Moscow
DATE
PUBLISHED 11 Feb 1950
LANGUAGE
DATE OF
INFORMATION
DATE DIST. // May 1950
50X1-HUM
NO. OF PAGES 2
SUPPLEMENT TO
REPORT NC.
THIS INCUR [NT CONTAINS INFORMATION AFFECT,NG THE NATIONAL DEFENSE
OE TIIE NI TED STATE: WITHIN THE MEANING OF ESPIONAGE ACT 50
0. 5 C HI AND S[. AS AMENDED ITS TRANSMISSION OR THE REVELATION
OE ITS CONTENTS IN INN MANNER TO AN UNAUTNORIE[C PERSON IS PRO'
HIBITED ST LAW REPRODUCTION OF THIS FORM IS PROHIR, TED
Doklady Akademii Nauk SSSR, Novaya Seriya, Vol LXX, No 5, 1950.
THE PROBLEM OF HIGH-VOLTAGE CABLE INSULATED WITH "ELEGAS"
B. M. Gokhberg and N. M. Reynov
Leningrad Physico-Tech Inst and Inst
of Physical Problems, Acad Sci USSR
Submitted by A. F. Ioffe
10 Dec 1949
STATE
ARMY
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High-voltage cable insulated with gas under pressure has recently begun to
obtain wide application.
During investigations of the electrical properties of various gases, the
high electrical strength of sulfur hexafluoride, "elegas," was established and
tested as filling for high-voltage cables. Preliminary studies of the break-
down strength of impregnated-paper cable in an "elegas" atmosphere (B. M. Gokh-
berg and M. V. Glikina, Zhurnal Tekhnicheskoy Fiziki, Vol XII, No 3, 1942)
showed that the use of "elegas' instead of nitrogen or carbon dioxide doubled
the breakdown >_trength.
Tests were made on gas-filled cables in cooperation with the "Sevkabell"
Plant. A three-strand 35-kilovolt cable with a common lead sheath was selected
for the tests. The current-carrying strands in the cable were covered with
metalized paper tape to create the smoothest possible surface for the strands.
The strands were insulated with strips of impregnated paper 0.12 millimeters
thick. After insulation, each strand was enclosed by a screen which fixed the
field of the separate strands. A hard paper-braid filling was used in twist-
ing the cable so that the lead sheath would retain its circular form and so
that the gas would spread freely within the cable. Antimony was added to the
lead to give the lead sheath (3 millimeters thick) high strength. The test
cable produced was about 150 meters long.
Testing for Hermetic Sealing
A length of cable, sealed with end junction boxes, filled with nitrogen
under a pressure of 3 atmospheres was observed for 24 hours. No marked pres-
sure drop was recorded by a manometer, which demonstrated the good hermetic
sealing of the cable with the end junction boxes.
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0I E 11A
_ s_rcment.s of Ionization Curves
The ionization curves were recorded on 6-meter cable lengths. The measure-
rrnts were made for cables filled with nitrogen, carbon dioxide, and "elegaa"
(FO, The cable was first evacuated, then scrubbed with the proper gas, and
finally filled with gas to the required pressure.
Ionization begins in "elegas" at considerably higher voltages than in ni-
trogen and carbon dioxide (for the same pressures). Intense ionization begins
at the same voltages for a cable filled with "elegas' to an excess pressure of
O..j atmosphere and for cables filled with nitrogen or carbon dioxide to an excess
pressure of 2.5 atmospheres. Tests of the breakdown strength of cables filled
with nitrogen and carbon dioxide at 2.5 atmospheres pressure and for a cable
filled with "elegas" at 0.5 atmosphere pressure showed that breakdown occurs at
100 kilovolts when volt'ge is applied for one hour.
OONFIDERi
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