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IEEE 1793-2012 pdf free

IEEE 1793-2012 pdf free.IEEE Guide for Planning and Designing Transition Facilities between Overhead and Underground Transmission Lines.
The purpose of this guide is to list and describe typical factors that should be considered in the planning and designing of transition facilities between overhead and underground transmission lines. Some of these factors relate to the installation, operation, and maintenance of the transmission system. This guide is intended to be comprehensive, hut may not be all inclusive.
2. Normative references
Thc following referenced documcnts arc indispensable for the application of this document For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
Accredited Standards Committee C2-20l2. National Electrical Safety Codet (NESC®).’
3. Planning
Transition facilities far overhead to underground transmission lines can be as simple as an overhead line dead-end structure with facilities for attaching a transmission cable, or they can be as extensive as a large transition station. Because of the electrical characteristics of underground transmission cable, arm underground system may often trigger the need for installation of additional equipment in order to deal with voltage control, thermal rating issucs, switching requirements. relay protection. and other factors. Often, these factors trigger the need for a transition station. Planning is needed to carefully consider and establish various electrical and cable system requirements. Such factors include the following:
— Type of underground cable system to be installed: extruded dielectric, high-pressure tluid-tilled pipe-type (IIPFF). high-pressure gas-filled pipe-type (IIP(IF). self-contained fluid-filled (SCFF). or gas-insulated transmission lines ((I ITt.).
NOTh—tIITL is considered to be a specialized subset of underground n-ansmission lines and will not be extensively detailed in this guidc. Howccr. many of the general principtcs detailed in the guide can he applied to GITL transitions,2
— Requiring multiple cables to match an overhead line for either capacity or reliability.
— Switching requirementsswitching equipment between the overhead and underground lines.
— Need for reactive compensation (shunt reactors) for the underground cable.
— Future capacity upgrades (for example, overhead line rc-conductoring, adding a second cable, or increasing cable size),
Future voltage upgrades.
— For pipe-type cables, the need for a fluid pressurizing plant or gas cabinet with its power supply, alarm, control, and monitoring requirements. and possibly circulation equipment and forced cooling equipment.
— For SCFF cables, the need for pressurizing equipment.
— Ability to repair underground cable failures while leaving the overhead line and’or other cables in service.IEEE 1793 pdf free download.

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