IEEE Std 2746:2020 pdf download.IEEE Guide for Evaluating AC Interference on Linear Facilities Co-Located Near Transmission Lines.
This guide identifies the mechanisms and analytical approach for ac interference effects on conductive linear facilities due to the operation of co-located electric transmission lines. The common mechanisms for ac interference, including magnetic inductive coupling, capacitive coupling, and conductive voltage transfer through soil arc discussed. Included are general guidelines and considerations for performing detailed ac interference analyses, with sections specific to the analysis of co-located pipeline and railroad facilities.
This guide does not dictate specific compliance limits, direct when an ac interference analysis must be performed. or cover other issues that may need to be considered in joint-use corridors, such as effects due to lightning striking the line or dc corrosion on structures.
1.2 Purpose
The electric utility industry is often encouraged or required to share corridors with other linear facilities, such as pipelines and railroads Electric transmission lines can electromagnetically couple onto and energize adjacent facilities. rcsultmg in electrical hazards to personnel and equipment. Guidance for analyzing these hazards is limited. The purpose of this guide is to provide general guidance on when a study may be required to analyze these hazards, what data is needed for a study, available industry compliance limits, general scenarios that may need to be analyzed. and sample mitigation approaches. This guide aids users, from both the electric utility and affected facility, in understanding the concerns and to develop approaches for studying and mitigating ac interference issues on their systems. While the guide focuses on co-located transmission lines and pipeline or railroad facilities, much of the information applies to similar linear facilities.
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendnients or corrigenda) applies.
3. Definitions, acronyms, and abbreviations
3.1 Definitions
For the purposes of this document, the following terms and definitions apply. The IEEE Standards Dictionary
Online should be consulted for tenns not defined in this clause.
ac interference: the total electromagnetic effects of an energized electrical facility on adjacent facilities, including magnetic inductive coupling, electric field capacitive coupling, and conductive voltage transfer through soil.
co-located: a term used to describe facilities near each other, often in shared or adjacent linear corridors.
reverse-phased system: two parallel circuits where the phasing is opposite from each other, such as a double circuit structure, A-B-C top-to-bottom on one side, and C-B-A top-to-bottom on the other side. Si’,i: crossphased, ideal-phased, low reactance-phased, optimal-phased.
holiday: a physical defect or hole in the insulating surface coating of a pipeline where ac-induced corrosion may occur.
linear facilities: metallic infrastructure or structures that traverses a path along the land, such as pipelines, railroads, or fences.IEEE Std 2746 pdf download.