IEEE C37.112-2018

$33.04

IEEE Standard for Inverse-Time Characteristics Equations for Overcurrent Relays

Published By	Publication Date	Number of Pages
IEEE	2018	25

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Description

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.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std C37.112™-2018 Front cover
2	Title page
4	Important Notices and Disclaimers Concerning IEEE Standards Documents
7	Participants
9	Introduction
10	Contents
11	1. Overview 1.1 Scope 1.2 Purpose 2. Definitions
12	3. The time-current equation 3.1 Coordination of inverse time-current characteristics 3.2 The analytic equation
14	3.3 Time dial 3.4 Standard time-current characteristics
17	Annex A (informative) Derivation of the induction characteristic A.1 The time-current equation
18	A.2 The reset characteristic A.3 Curves shaped by saturation
23	Annex B (informative) Bibliography
25	Back cover