Active Standard

IEEE C37.112-2018

IEEE Standard for Inverse-Time Characteristics Equations for Overcurrent Relays

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.

Sponsor Committee
PE/PSRCC - Power System Relaying and Control
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Status
Active Standard
PAR Approval
2017-03-23
Superseding
C37.112-1996
Board Approval
2018-12-05
History
Published:
2019-02-05

Working Group Details

Society
IEEE Power and Energy Society
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Sponsor Committee
PE/PSRCC - Power System Relaying and Control
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Working Group
C37.112_WG - Inverse-Time Characteristic Equations for Overcurrent Relays
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IEEE Program Manager
Malia Zaman
Contact
Working Group Chair
Randall Crellin
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C37.112-1996

IEEE Standard Inverse-Time Characteristic Equations for Overcurrent Relays

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.

Learn More

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