Estimating AC Mitigation Requirements for …

Copyright 2005 Safe Engineering Services & technologies ltd. All rights reserved. 1 Estimating AC Mitigation Requirements for Pipelines Installed in High Voltage AC Corridors: Fault Conditions R. D. Southey, Eng. W. Ruan, F. P. Dawalibi, Eng., S. Fortin, Safe Engineering Services & technologies ltd. 1544 Viel, Montreal, Quebec, Canada, H4M 1G4 Tel.: (514) 336-2511; Fax: (514) 336-6144; E-mail: Web Site: ABSTRACT A previous paper1 has addressed the question of Estimating Mitigation Requirements for pipelines installed in high voltage AC corridors, such as to maintain induced voltages at acceptable levels during normal operating conditions on the power system. This paper addresses the more difficult problem of Estimating what Mitigation is required to maintain pipeline coating stress voltages within acceptable limits during fault conditions on the power system. The difficulty of this undertaking arises primarily from the fact that AC interference during fault conditions includes not only induction, but also voltages transferred through earth to the pipeline location from power line poles or towers near which the fault has occurred: as a result, the analysis is more complex and the Mitigation Requirements are influenced by a greater number of factors.

Copyright © 2005 Safe Engineering Services & technologies ltd. All rights reserved. 3 Each case studied represents a variation of a single parameter from its base ...

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