S7 Control; Setpoint Groups - GE 750 Instruction Manual

S7 Control

Setpoint Groups

SETPOINT
GROUPS
NOTE
GE Multilin
S7 Control
PATH: SETPOINTS S7 CONTROL
[ ] ACTIVE SETPOINT
GROUP: Group 1
EDIT SETPOINT GROUP:
MESSAGE
Active Group
OPEN BREAKER
MESSAGE
INHIBIT: Disabled
OVERCURRENT PICKUP
MESSAGE
INHIBIT: Disabled
OVERVOLTAGE PICKUP
MESSAGE
INHIBIT: Disabled
UNDERVOLTAGE PICKUP
MESSAGE
INHIBIT: Disabled
UNDERFREQ PICKUP
MESSAGE
INHIBIT: Disabled
All setpoints contained under the
four 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
setpoint. 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
ACTIVE SETPOINT GROUP
selection of the active 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 asserted the relay would use Group 4. If the
logic input for Group 4 then becomes de-asserted, the relay will use Group 3. Any
change from the default Group 1 will be stored in the event recorder.
In some application conditions, the user may require that the relay will not change
from the present active group. This prevention of a setpoint group change can be
applied when any of the overcurrent (phase, neutral, ground, sensitive ground, or
negative sequence), overvoltage, bus or line undervoltage, or underfrequency
elements are picked-up.
Pickup of a protection element is possible when set to any value except "Disabled",
so elements not used to perform tripping can also inhibit setpoint changes. A
setpoint change can also be prevented if the breaker is open, so that a fault
detected before a reclosure will not cause a group change while the breaker is open.
http://www.GEmultilin.com
SETPOINT GROUPS
Range: Group 1, Group 2, Group 3,
Range: Group 1, Group 2, Group 3,
Range: Enabled, Disabled
Range: Enabled, Disabled
Range: Enabled, Disabled
Range: Enabled, Disabled
Range: Enabled, Disabled
setpoints page are reproduced in
S5 PROTECTION
setpoint or by logic input. If there is a conflict in the
750/760
Feeder Management Relay
Group 4
Group 4, Active Group
EDIT SETPOINT GROUP
5–97