IEEE C37.112-2018
Current
The latest, up-to-date edition.
IEEE Standard for Inverse-Time Characteristics Equations for Overcurrent Relays
Hardcopy , PDF
English
05-02-2019
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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
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.
| Committee |
Power System Relaying and Control
|
| DocumentType |
Standard
|
| ISBN |
978-1-5044-5351-6
|
| Pages |
25
|
| PublisherName |
Institute of Electrical & Electronics Engineers
|
| Status |
Current
|
| Supersedes |
| 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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