Superseded Standard

IEEE 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.

Sponsor Committee
PE/PSRCC - Power System Relaying and Control
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Status
Superseded Standard
Superseded by
C37.112-2018
Board Approval
1996-09-19
History
ANSI Approved:
1997-02-27
Published:
1996-11-30
Reaffirmed:
2007-03-08

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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C37.112-2018

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.

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No Superseded Standards
No Inactive-Withdrawn Standards
No Inactive-Reserved Standards
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