S&C Vista SD - Appendix C; Switchgear Styles and Models

S&C Instruction Sheet 695-535 29
Programming the Overcurrent Protection Settings
Different TCC families have different setting selections and editable fields. Fields that
are not editable will be grey. Selections that are invalid will prompt an error message,
and any cell with an invalid value will be highlighted in yellow after clicking on the Save
button. An error message will also appear at the top of the screen in red text describing
the error. See the “Warnings Messages” section on page 53 for more information on
warning and error messages.
Select protective settings as follows:
STEP 1. Select “Interrupter 1” or “Interrupter 2” from the Selection menu.
STEP 2. Select the desired Time Overcurrent Phase Protection settings. Denitions
for the Time Overcurrent Phase Protection settings, Low-Current Cutoff,
Denite Time 1 and 2, Ground Protection, Negative Sequence, and
Sensitive Earth Fault settings are available in the “Overcurrent Protection
Setting Denitions” section on page 31. A listing of the available Time
Overcurrent Phase Protection settings can be found in the “Overcurrent
Control Settings” section on page 47.
For fault interrupters configured for three-phase tripping or single-phase trip/ three-
phase lockout, the Time Overcurrent Ground, Negative Sequence, and Sensitive
Earth Fault protection settings can then be enabled if required. These features are
disabled by default when shipped from the factory. See Figure 22.
Figure 22. The Time Overcurrent Ground, Negative Sequence, and Sensitive Earth Fault Protection
menu.