Evaluation of pipe-type cable joint restraint systems

Technical Report · Thu Mar 01 04:00:00 EST 1990

OSTI ID:7200885

Silver, D A; Seman, G W ^[1]

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1. Pirelli Cable Corp., Lexington, SC (USA)

the purpose of this project was to evaluate two systems for restraining the movement of 345kV high-pressure oil-filled (HPOF) cable joints during load cycling. Problems with joints and adjacent cables due to thermomechanical bending (TMB) experienced by the Consolidated Edison Company of New York and Public Service Electric Gas Company of New Jersey are reviewed. Some approaches to reducing or preventing TMB induced damage to HPOF pipe type cable joints are discussed. The design and operation of a special test apparatus for simulating TMB effects under laboratory conditions is described. One of the two joint restraint systems evaluated under this project was developed by PSE G and employed wedging devices, which could be retrofitted into existing installations, that limited the longitudinal movement of the joints during load cycling. The other system developed by Pirelli Cable Corporation applied the restraining force to the cylindrical portion of the hand applied joint insulation by means of support spiders and steel rods attached to the reducer faces. The test results show that the PSE G restraint system can effectively limit joint longitudinal movement while causing a minimal amount of mechanical disturbance to the joint stress cones. The test results obtained with the PCC system are inconclusive and indicate that further refinement and testing are required to demonstrate the effectiveness of this promising joint restraint system.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (USA); Pirelli Cable Corp., Lexington, SC (USA)
• Sponsoring Organization: EPRI
• OSTI ID: 7200885
• Report Number(s): EPRI-EL-6760
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
240301* -- Power Transmission Lines & Cables-- Power Cables-- (1990-)
ALLOYS
CABLES
CHEMISTRY
CONDUCTOR DEVICES
DAMAGE
DESIGN
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTROCHEMISTRY
EQUIPMENT
INSTALLATION
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MECHANICAL PROPERTIES
PERFORMANCE TESTING
PHYSICAL PROPERTIES
PIPES
RESTRAINTS
RODS
SIMULATION
STEELS
STRESSES
TENSILE PROPERTIES
TESTING