Description: 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.
Get This Standard
Buy Purchase a copy of this standard Buy
Buy VuSpec CD ROM This standard can be purchased as part of the following VuSpect CDs:
- IEEE Power Switchgear, Substations & Relays Standards Collection Buy
- IEEE Power Systems Relays Standards Collection Buy
Access with Subscription Standards Online subscribers can access this standard in IEEE Xplore Digital Library. Access Learn More