Ten (10) Pushbutton Membrane Front Panel Defaults - GE 850 Instruction Manual

DEVICE
Ten (10) Pushbutton
Membrane Front
Panel Defaults
NOTE:
NOTE
5–54
PB3 - RECLOSE ENABLED
Default: Setpoints > Control > Autoreclose 1 > Setup > Block/Cancel
For the Reclose Enabled pushbutton to be functional, the Autoreclose control function
needs to be enabled in Setpoints > Control > Autoreclose 1 > Setup > Function. When
PB3 is OFF, the Autoreclose function can be blocked by the PB3 OFF operand. The
Autoreclose 1 Block/Cancel setting is by default assigned to the PB3 Off operand.
PB4 - GND TRIP ENABLED
Default: Setpoints > Protection > Group[1-6] > Current > GroundTOC1 > Block
For the Gnd Trip Enabled pushbutton to be functional, the associated ground protection
element must be enabled first. By default, this is configured for the Ground Time
Overcurrent 1 element (Gnd TOC1). The Gnd TOC1 Block setting is by default assigned to
the PB4 Off operand.
PB5 - REMOTE ENABLED
Default: Setpoints > Control > Local Control Mode > Local Mode
The Remote Enabled pushbutton is the same as the Remote Mode Enabled. By default,
the local mode is active in the relay. To ensure that the Remote Enabled pushbutton
activates the remote mode is equivalent to turning off the local mode. Since these two
modes are exclusive, if the relay is not in local mode it is automatically in remote mode.
The LED for PB5 is turned on when the Local Mode is OFF.
PB6 - HOT LINE TAG
Default: None
The Hot Line Tag pushbutton is not programmed to any specific feature by default. A User
can manually apply it to the various features mentioned in the examples below.
The Hot line tag is used when a maintenance crew works on a live circuit. Under such
conditions, it is desirable to have sensitive settings for protection and automatic
reclosing blocked for the circuit if a trip occurs.
Blocking Breaker Operations
In the breaker control logic, both opening and closing of the breaker can be supervised
by the hot line tag signal. By default, these are set to Off but the PB 6 ON (Hot Line Tag)
operand can be used to block breaker operations.
Switching of Setting Groups
Switching of setting groups for sensitive settings can be achieved by assigning the PB6
ON (Hot Line Tag) operand to the alternate setting group input setpoint located at
Setpoints > Control > Setpoint Group > Set Group 2 Active. PB8 ON (Alt Settings) is by
default programmed to switch to alternate settings, both PB6 and PB8 can be used by
implementing FlexLogic as shown below and assigning the output to the Setpoint Group
2 Activation setting.
Reduce Recloser Shots
When the pushbutton is enabled, the PB6 ON (Hot Line Tag) operand can be used to
block the upstream autoreclosing or limit the autoreclosing functionality to a single shot
so that after tripping, the reclosing sequence goes straight to lockout. This can be
implemented in Setpoints > Control > Autoreclose 1 > Setup > Reduce Maximum To 1
by assigning the PB6 ON (Hot Line Tag) operand.
CHAPTER 5: DEVICE, SYSTEM, INPUT AND OUTPUT SETPOINTS
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL