S7 Control - GE 750 Instruction Manual

CHAPTER 5: SETPOINTS
5.8

S7 Control

5.8.1 Setpoint Groups
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SETPOINT
GROUPS
750 FEEDER MANAGEMENT RELAY – INSTRUCTION MANUAL
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PATH: SETPOINTS S7 CONTROL
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All setpoints contained under the
groups, identified as Groups 1, 2, 3, and 4. These multiple setpoints provide the capability
of both automatic and manual changes to protection settings for different operating
situations. Automatic (adaptive) protection setpoint adjustment is available to change
settings when the power system configuration is altered. By monitoring the state of a bus
tie breaker on the bus connected to the associated feeder breaker, different settings may
be used depending the tie breaker state. Automatic group selection can be initiated by use
of a logic input. The manual adjustment capability is available for those users who use
different settings for different seasons of the year. Manual group selection can be initiated
from the keypad or via communications.
In order to allow the display and editing of one group while another group is used for
protection, two operating states have been assigned to setpoint groups. The "Active
Group" is used for protection, and is indicated by the appropriate faceplate LED indicator
being turned on continuously. The 'Edit' group is displayed and may be used to alter
protection settings. It is indicated by the appropriate faceplate LED indicator being flashed.
If a single group is selected to be both the Active and Edit group, the appropriate indicator
is on continuously.
The setpoint group to be edited is selected through the
Group 1 is the default for the "Active Group" and will be used unless another group is
requested to become active. The active group can be selected with the
setpoint or by logic input. If there is a conflict in the selection of the active group,
GROUP
between a setpoint and logic input, or between two logic inputs, the higher numbered
group will be made active. For example, if the logic inputs for Group 2, 3, and 4 are all
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SETPOINT GROUPS
ACTIVE SETPOINT
GROUP: Group 1
EDIT SETPOINT GROUP:
Active Group
OPEN BREAKER
INHIBIT: Disabled
OVERCURRENT PICKUP
INHIBIT: Disabled
OVERVOLTAGE PICKUP
INHIBIT: Disabled
UNDERVOLTAGE PICKUP
INHIBIT: Disabled
UNDERFREQ PICKUP
INHIBIT: Disabled
setpoints page are reproduced in four
S5 PROTECTION
EDIT SETPOINT GROUP
S7 CONTROL
Range: Group 1, Group 2,
Group 3, Group 4
Range: Group 1, Group 2,
Group 3, Group 4,
Range: Enabled, Disabled
Range: Enabled, Disabled
Range: Enabled, Disabled
Range: Enabled, Disabled
Range: Enabled, Disabled
setpoint.
ACTIVE SETPOINT
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