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General| Brand | Schweitzer Engineering Laboratories |
|---|---|
| Model | SEL-351R |
| Category | Relays |
| Language | English |
Details changes made in each revision of the manual, including specific section updates and additions.
Explains the specific functions of overcurrent elements when factory default EZ settings are active for a particular settings group.
Explains the symmetry amongst Figures 1.8 through 1.14 regarding reclose cycle and shot counter increments.
Compiles cold load pickup scheme outputs and other enabling logic that propagates to overcurrent elements.
Explains how overcurrent elements control the trip logic and other trip logic details.
Explains the logic for realizing the entire drive-to-lockout logic using SELOGIC variables.
Describes four levels of phase instantaneous/definite-time overcurrent elements, with two additional levels available.
Details phase time-overcurrent elements, 51P1T and 51P2T, and their enablement settings.
Explains how the loss-of-potential (LOP) logic operates and how it affects directional elements.
Details the load-encroachment logic and settings, allowing phase overcurrent elements to be set independently of load levels.
Explains how directional control is enabled using setting E32 and describes available directional elements for ground overcurrents.
Describes how directional control for overcurrent elements is enabled using setting E32.
Explains the settings for directional control, including enable settings, automatic settings, and user-settable parameters.
Explains the flexible tripping provided by SELOGIC control equation settings TRCOMM, DTT, TRSOTF, and TR.
Describes the final logic controlling the close output for automatic reclosures and other close conditions.
