Development of 230-kV high-pressure, gas-filled, pipe-type cable system: Model test program phase
- Pirelli Cable Corp., Florham Park, NJ (USA)
The objective of this project was the development of a 230 kV high-pressure gas-filled (HPGF) pipe-type cable employing paper or laminate of paper-polypropylene-paper (PPP) insulation pressurized with N{sub 2} gas or a blend of 15% SF{sub 6}/85% N{sub 2} gas. Heretofore, HPGF pipe-type cables have been restricted to 138 kV ratings due to technical difficulties in achieving higher voltage ratings. In view of the high cost of manufacturing and testing a large number of full size cables, cable models with 2 mm (80 mils) and 2.5 mm (100 mils) wall thicknesses of insulation enclosed in a test fixture capable of withstanding a test pressure of 2070 kPa (300 psig) and high electrical stresses were employed for dissipation factor versus voltage measurements and for ac and impulse breakdown tests at rated and emergency operating temperatures. In addition, a 36 cm (14 in) full wall cable model enclosed in a pressure vessel was utilized for transient pressure response tests. The results of this investigation attest tot he technical feasibility of the design and manufacture of a 230 kV HPGF pipe-type cable employing paper or PPP insulation pressurized with 100% N{sub 2} gas or a blend of 15% SF{sub 6}/85% N{sub 2} gas for operation under normal and 100 hour emergency conditions at conductor temperatures of 85{degree} and 105{degree}C, respectively. The manufacture of a full size PPP insulated cable pressurized with a blend of 15% SF{sub 6}/85% N{sub 2} gas employing pre-impregnated PPP insulating tapes and an annular conductor based on the design stresses defined in this report is recommended for laboratory evaluation and extended life tests. 11 refs., 45 figs., 11 tabs.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (USA); Pirelli Cable Corp., Florham Park, NJ (USA)
- Sponsoring Organization:
- EPRI
- OSTI ID:
- 6559259
- Report Number(s):
- EPRI-EL-6933
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
240201 -- Power System Networks
Transmission & Distribution-- AC Systems-- (1990-)
240301* -- Power Transmission Lines & Cables-- Power Cables-- (1990-)
CABLES
CONDUCTOR DEVICES
DESIGN
DIELECTRIC PROPERTIES
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELEMENTS
EQUIPMENT
FLUORIDES
FLUORINE COMPOUNDS
GAS-INSULATED CABLES
HALIDES
HALOGEN COMPOUNDS
MEDIUM PRESSURE
MEDIUM TEMPERATURE
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PAPER
PERFORMANCE TESTING
PHYSICAL PROPERTIES
PIPES
POLYMERS
POLYOLEFINS
POLYPROPYLENE
POWER TRANSMISSION
POWER TRANSMISSION LINES
SULFUR COMPOUNDS
SULFUR FLUORIDES
TESTING
UNDERGROUND POWER TRANSMISSION