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IEEE C37.112-2018

IEEE Standard for Inverse-Time Characteristics Equations for Overcurrent Relays

standard by IEEE , 02/05/2019

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Full Description

Scope

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.

Purpose

The purpose of this standard is to provide an analytic (formula) representation of typical relay operating characteristic curve shapes of various inverse-time relays to facilitate representation by microprocessor-type relays and promote a degree of standardization in the inverse shape of a selected curve.

Abstract

Revision Standard - Active. The inverse-time characteristics of overcurrent relays are defined in this standard. Operating equations and allowances are provided in the standard. The standard defines an integral equation for microprocessor relays that ensures coordination not only in the case of constant current input but for any current condition of varying magnitude. Electromechanical inverse-time overcurrent relay reset characteristics are defined in the event that designers of microprocessor based relays and computer relays want to match the reset characteristics of the electromechanical relays.
 

Product Details

Published:
02/05/2019
ISBN(s):
9781504455213, 9781504453516, 9781504453523
Number of Pages:
22
File Size:
1 file , 3.2 MB
Product Code(s):
STD23438, STDPD23438, STDPL23438
Note:
This product is unavailable in Russia, Ukraine, Belarus
 

Document History

  1. IEEE C37.112-2018

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    IEEE Standard for Inverse-Time Characteristics Equations for Overcurrent Relays

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  2. IEEE C37.112-1996


    IEEE Standard Inverse-Time Characteristic Equations for Overcurrent Relays

    • Historical Version