Analysis of electrical interference effects of transmission lines upon nearby pipelines has been a topic of growing interest due to the proliferation of rights-of-way which must be shared by transmission lines and pipelines. This paper describes the results of a recent joint EPRI/A.G.A. research project whose objectives were to develop an effective twl For simulating complex realistic right-of-way problems accurately and to investigate the effects of various system parameters. The ECCAPP computer program, which resulted from the EPRI/A.G.A. research program, combines a powerful input data preprocessor with a computation algorithm which accurately evaluates the effects of both conductive and inductive interference for arbitrarily positioned above-ground and buried conductors which could occur in typical rights-of-way. This paper discusses, in a detailed manner, the computation methods used by ECCAPP. A companion paper summarizes some of the results of an extensive parametric analysis which was conducted using ECCAPP and which illustrates some of the capabilities of the computer program and provides insight on how to control both conductive and inductive interference effects.
I . INTRODUCTIONThe recent tendency of government regulatory agencies to restrict or deny public utilities access to new rights-of-way is not only intensifying, but also more and more court rulings are establishing what has been described recently as the "principle of nonproliferation" of utility corridors [I]. This has resulted in situations in which power lines, pipelines, railroads, communication lines, and similar services must coexist in a relatively narrow band of land. This approach consolidates and minimizes the amount of land used by several different utilities.There are a number of compatibility problems which must be carefully considered before a decision can be made to share new or existing rights-of-way. These problems involve a wide spectrum of disciplines each requiring in-depth expertise in environmental, institutional, conceptual and operational assessments and requirements. While all aspects are equally important, the research program whose results are summarized in this paper [2] refers exclusively to the environmental aspect dealing specifically with electrical interference. Moreover, the work described in this paper specializes in the area of inductive and conductive coupling between power lines and natural gas pipelines.The research program, EPRI/A.G.A. Project PR-176-510/RP742-4, resulted from the need to expand the work completed during previous EPRI1A.G.A. projects [3,4] in order to include inductive and conductive coupliilg effects during steady-state as well as fault conditions.The main objectives of the research project were to provide to both the electric power and gas pipeline industries the following items, consolidated into one convenient package:-A comprehensive reference document describing advanced theories and techniques which accurately analyze the effects of transmission line faults on natural gas transmi...
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