dc breakdown strength of dielectric materials at cryogenic temperatures
The HVDC superconducting cable, under development at the Los Alamos Scientific Laboratory will operate at a temperature of 12/sup 0/K and a helium pressure of 1.38 MPa. Because dc breakdown data of dielectric materials at these operating conditions were not previously available, extensive tests were performed on 11 dielectric materials in sheet form. Three of these materials were impregnated with mineral oil, which increased their dc withstand strength significantly. Four of these 11 materials were selected for further tests at varying temperatures and pressures. The dc-breakdown field of cellulose paper (with and without oil impregnation) and PP/C (cellulose paper/polypropylene-cellulose paper) varied as the exponential of the inverse of temperature. For the two polyethylene materials tested, the dc-breakdown strength showed a peak between 12 and 298/sup 0/K. Higher pressure increased the breakdown strength of the materials. Higher pressure or lower temperature also decreased the probability of surface flashover.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6414252
- Report Number(s):
- LA-UR-78-2403; CONF-790417-2
- Resource Relation:
- Conference: IEEE transmission and distribution meeting, Atlanta, GA, USA, Apr 1979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cryogenic power transmission technology: cryogenic dielectrics. Fourteenth quarterly report, April 1, 1976--June 30, 1976
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Related Subjects
DIELECTRIC MATERIALS
BREAKDOWN
HVDC SYSTEMS
SUPERCONDUCTING CABLES
PAPER
POLYETHYLENES
POLYPROPYLENE
CRYOGENICS
EXPERIMENTAL DATA
FLASHOVER
LOW TEMPERATURE
MEDIUM TEMPERATURE
PERFORMANCE TESTING
TABLES
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE
CABLES
CONDUCTOR DEVICES
CURRENTS
DATA
DATA FORMS
DC SYSTEMS
ELECTRIC CABLES
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRICAL EQUIPMENT
EQUIPMENT
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERS
POLYOLEFINS
POWER SYSTEMS
TESTING
200303* - Power Transmission & Distribution- Superconducting & Cryogenic Systems- (-1989)
200302 - Power Transmission & Distribution- DC Systems- (1989-)