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  • IEEE C37.112-2018

    Current The latest, up-to-date edition.

    IEEE Standard for Inverse-Time Characteristics Equations for Overcurrent Relays

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  05-02-2019

    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 References
    3 Definitions
    4 The time-current equation
      4.1 Coordination of inverse time-current characteristics
      4.2 The analytic equation
      4.3 Time dial
      4.4 Standard time-current characteristics
    Annex A (Informative) - Derivation of the induction
                            characteristic
    Annex B (Informative) - Bibliography

    Abstract - (Show below) - (Hide below)

    The scope of this standard includes the review of various existing analytic techniques used to represent relay operating characteristic curve shapes and proposes analytical (formula) representation of typical operating characteristic curve shapes to foster some standardization of available inverse-time relay characteristics provided in microprocessor or computer relay applications.

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

    Committee Power System Relaying and Control
    Document Type Standard
    Publisher Institute of Electrical & Electronics Engineers
    Status Current
    Supersedes

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

    IEEE C37.90-2005 IEEE Standard for Relays and Relay Systems Associated with Electric Power Apparatus
    IEC 60255-3:1989 Electrical relays - Part 3: Single input energizing quantity measuring relays with dependent or independent time
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