Space charge measurement in dc cable materials
- National Inst. of Standards and Technology (IMSE), Gaithersburg, MD (USA). Polymers Div.
This project was designed to determine the amounts and distributions of space charge in dc-stressed polymer materials commonly used as insulation in solid, extruded polymer-insulated, high voltage, transmission and distribution, power cables. The purpose of the work is to inform insulation and cable makers about special requirements that dc stress places on insulation properties in such cables. The work included: (1) development of a short-pulse laser and rapid data acquisition and processing techniques, and measurement of space charge distributions in polymer films, (2) development of impulse breakdown equipment and measurement of breakdown strengths of polymer films, and (3) development of theoretical models to account for the space charge behavior observed in the polymer films. Polyethylenes and ionomers used in this work all showed significant amounts of negative space charge distributed nearly uniformly throughout films that had been charged with a constant high voltage to steady-state current conditions. The work showed that the space charge in polyethylene cable insulation could not be diminished by blending polyethylene with ionomers, as was concluded in earlier research. 25 figs., 8 tabs.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (USA); National Inst. of Standards and Technology (IMSE), Gaithersburg, MD (USA). Polymers Div.
- Sponsoring Organization:
- EPRI; Electric Power Research Inst., Palo Alto, CA (USA)
- OSTI ID:
- 5779887
- Report Number(s):
- EPRI-EL-7301
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
240301* -- Power Transmission Lines & Cables-- Power Cables-- (1990-)
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
BREAKDOWN
CABLES
CONDUCTOR DEVICES
DATA ACQUISITION
DC SYSTEMS
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATION
ENERGY SYSTEMS
EQUIPMENT
FILMS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYETHYLENES
POLYMERS
POLYOLEFINS
POWER SYSTEMS
PULSE TECHNIQUES
SPACE CHARGE
STRESSES