GE 745 Instruction Manual page 143

CHAPTER 5: SETPOINTS
5.6.2 Setpoint Group

SETPOINT GROUP []
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
SETPOINTS
• Shown as a block with the heading SETPOINT.
• The exact wording of the displayed setpoint message identifies the setpoint.
• Major functional setpoint selections are listed below the name and are incorporated in
the logic.
MEASUREMENT UNITS
• Shown as a block with inset labelled RUN.
• The associated pickup or dropout setpoint is shown directly above.
• Operation of the detector is controlled by logic entering the RUN inset.
• Relationship between setpoint and input parameter is indicated by simple
mathematical symbols: <, >, etc.
TIME DELAYS
• Shown as a block with the following schematic symbol:
• The delay before pickup is indicated by t
by t .
DO
• If the delay before pickup is adjustable, the associated delay setpoint is shown directly
above, and the schematic symbol indicates that t
LED INDICATORS
• Shown as the following schematic symbol: ⊗.
• The exact wording of the front panel label identifies the indicator.
LOGIC
• Described using basic AND gates and OR gates
PATH: SETPOINTS S4 ELEMENTS

ACTIVE SETPOINT
GROUP: Group 1
EDIT SETPOINT
MESSAGE
GROUP: Active Group
GROUP 2 ACTIVATE
MESSAGE
SIGNAL: Disabled
GROUP 3 ACTIVATE
MESSAGE
SIGNAL: Disabled
GROUP 4 ACTIVATE
MESSAGE
SIGNAL: Disabled
Each protection and monitoring element setpoint (programmed in
copies, and these settings are organized in four setpoint groups. Only one group of settings
are active in the protection scheme at a time. The active group can be selected using the
setpoint or using a logic input. The setpoints in any group can be
ACTIVE SETPOINT GROUP
viewed or edited using the
• ACTIVE SETPOINT GROUP: Select the number of the
are to be active in the protection scheme. This selection will be overridden if a higher
number setpoint group is activated using logic inputs.
and the delay after dropout is indicated
PKP,
SETPOINT GROUP

setpoint.
EDIT SETPOINT GROUP
S4 ELEMENTS
t =DELAY
PKP
t =0
.
DO
= DELAY.
PKP
Range: Group 1, Group 2, Group 3,
Group 4
Range: Group 1, Group 2, Group 3,
Group 4, Active Group
Range: Logic Input 1 to 16, Disabled
Range: Logic Input 1 to 16, Disabled
Range: Logic Input 1 to 16, Disabled
S4 ELEMENTS ) has four
whose settings
SETPOINT GROUP
5–47