IEEE C37.112 : 1996

IEEE C37.112 : 1996

INVERSE-TIME CHARACTERISTIC EQUATIONS FOR OVERCURRENT RELAYS

Institute of Electrical & Electronics Engineers

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Table of Contents

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

Reviews various existing analytic techniques for representation of relay operating characteristic curved shapes and gives typical operating characteristic curve shapes for standardizing available inverse-time relay characteristics in microprocessor or computer relay applications.

General Product Information

Document Type Standard
Status Current
Publisher Institute of Electrical & Electronics Engineers
Supersedes
  • IEEE DRAFT C37.112 : D11 JAN 96

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