• IEEE 1427-2006

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    IEEE Guide for Recommended Electrical Clearances and Insulation Levels in Air Insulated Electrical Power Substations

    Available format(s):  PDF

    Superseded date:  26-04-2021

    Language(s):  English

    Published date:  04-05-2007

    Publisher:  Institute of Electrical & Electronics Engineers

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    Table of Contents - (Show below) - (Hide below)

    1 Overview
      1.1 Scope
      1.2 Purpose
    2 Normative references
    3 Definitions
    4 Criteria
      4.1 Safety codes and regulations
      4.2 Basic lightning impulse insulation level criteria
      4.3 Radio interference voltage and corona criteria
      4.4 Operating history
      4.5 Economic aspects
      4.6 Community acceptance
    5 Substation insulation coordination
      5.1 Protective margins and arrester maximum continuous
          operating voltage
      5.2 Selection of basic lightning impulse insulation level
          and basic switch impulse insulation level
      5.3 Selection of electrical clearances
    6 Electrical operating/design clearances
      6.1 General discussions
      6.2 Historical background
      6.3 Clearances based on lightning impulse conditions
      6.4 Clearances based on switching surge conditions
    7 Electric maintenance/safety clearances
    8 Substation voltage uprating and compact design
      8.1 BIL/System voltage ratio concept
      8.2 Other considerations
    Annex A (informative) Bibliography
    Annex B (informative) Example calculations

    Abstract - (Show below) - (Hide below)

    This guide, covering three-phase ac systems from 1 kV to 800 kV, provides recommended electrical operating and safety 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.

    General Product Information - (Show below) - (Hide below)

    Committee Substations
    Development Note Supersedes IEEE DRAFT 1427. (10/2007)
    Document Type Standard
    Publisher Institute of Electrical & Electronics Engineers
    Status Superseded
    Superseded By

    Standards Referenced By This Book - (Show below) - (Hide below)

    IEEE 1268-2005 IEEE Guide for Safety in the Installation of Mobile Substation Equipment
    IEEE C2-2023 REDLINE 2023 National Electrical Safety Code(R) (NESC(R))
    IEEE 1268-2016 REDLINE IEEE Guide for Safety in the Installation of Mobile Substation Equipment
    IEEE 1264-2015 IEEE Guide for Animal Deterrents for Electric Power Supply Substations

    Standards Referencing This Book - (Show below) - (Hide below)

    IEEE 1127-2013 REDLINE IEEE Guide for the Design, Construction, and Operation of Electric Power Substations for Community Acceptance and Environmental Compatibility
    IEEE 1313.1-1996 IEEE Standard for Insulation Coordination - Definitions, Principles and Rules
    IEEE C2-2002 National Electrical Safety Code 2002 Edition
    IEEE 998-2012 IEEE Guide for Direct Lightning Stroke Shielding of Substations
    IEEE 4-2013 IEEE Standard for High-Voltage Testing Techniques
    IEEE 1313.2-1999 IEEE Guide for the Application of Insulation Coordination
    IEEE 1264-2015 IEEE Guide for Animal Deterrents for Electric Power Supply Substations
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