Proper electrical clearances are necessary for the design, construction, and operation of electric supply substations. This document develops guidelines for the application of recommended electrical clearances and insulation levels in air-insulated substations.This guide, covering three-phase ac systems from 1 kV to 800 kV, provides recommended electrical clearances and insulation levels in air-insulated electric supply substations; addresses insulation coordination procedures; provides design procedures for the selection and coordination of the insulation levels within the station as they relate to substation clearances; and addresses how reduced clearances in high-voltage ac substations will allow for compact bus arrangements and substation voltage uprating applications. This guide addresses insulation coordination procedures, including the choice of insulation levels and arrester specification, in limited detail and only as relevant to clearance requirements. Detailed and expanded coverage of insulation coordination procedures is provided in other ANSI and IEEE guides and standards (see Clause 2). This guide focuses on open-air bus assemblies and configurations and excludes apparatus clearances (i.e., bushing clearances for transformers, and breakers). Detailed coverage of apparatus clearances is provided in other applicable guides and standards.
Get Involved In The Development Of This Standard
Contact the IEEE-SA Liaison Simply click here to voice your interest. Michael Kipness Learn More About Standards ParticipationAnyone can participate, there are a variety of programs and services to
facilitate the involvement of industry and the public. More Become a Member and Ballot on this StandardMembership empowers you to participate & lead in the development of
standards. Tell Me More