132,000-Volt, Single-Conductor, Lead Covered Cable Introduction, Economics and Commercial Demand

This paper, which describes the development of the oil-filled type of 132,000-volt cable, has for convenience been divided into four parts. In the first part the economic and commercial aspects of the development are discussed. It is pointed out that this type of cable permits direct interconnection with high-voltage overhead lines and it is felt that the satisfactory operation of the two lines which have been placed in service this year will be an indication that 220,000-volt cable can be constructed without material changes in the design. The theory and design of the cable are completely developed in the second part. Particular reference is made to the effect on the dielectric of occluded gas and the method of eliminating trouble from this source in the oil filled type is described. The third part relates to the manufacture, inspection, and testing of the cable and equipment. The tests showed that the electrical constants of the cable were substantially unchanged by the normal temperature cycle. The installations at New York and Chicago are described in the fourth part. Inspection, indication of oil leaks, cable and joint repairs are discussed. The replacement of a length of the New York cable, which developed a leak in the sheath, is covered in detail.