THE PROBLEM OF HIGH-VOLTAGE CABLE INSULATED WITH ELEGAS

Document Type: 
Collection: 
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
Case Number: 
Publication Date: 
May 11, 1950
Content Type: 
REPORT
File: 
Body: 
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 Sanitized Copy Approved for Release 2011/08/17: CIA-RDP80-00809A000600310060-0 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. Sanitized Copy Approved for Release 2011/08/17: CIA-RDP80-00809A000600310060-0 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 Sanitized Copy Approved for Release 2011/08/17: CIA-RDP80-00809A000600310060-0