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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.
Document identifier
IEEE C37.112-2018
Title
IEEE Standard for Inverse-Time Characteristics Equations for Overcurrent Relays
IEEE Category
Protective Relaying
Publication date
2019-02-05
International Relationship
History of version
IEEE C37.112-2018 * IEEE C37.112-1996
Price |
54 vnd |