A-C Resistance of Pipe-Cable Systems With Segmental Conductors [includes discussion]

It is the purpose of this report to present a correlated study of the a-c resistance characteristics of segmental cables installed in steel pipe, covering the practical range of size from 1,000,000 to 2,500- 000 circular mils, operating at 60 cycles. The report is based on data obtained in a joint research project conducted at Electrical Testing Laboratories, Inc. (ETL), under the sponsorship of the Consolidated Edison Company of New York, Inc., the Association of Edison Illuminating Companies (AEIC), and the Edison Electric Institute (EEI), and supplemented by data obtained in the laboratories of cable manufacturers. The total data available have been studied by a working group of the Cable Characteristics Subcommittee to establish underlying theory and theoretical or empirical relationships between values of effective resistance which may be calculated in air using accepted equations and values which may be expected in pipe. Working equations for the calculation of values in pipe are presented in this report.