GE UR Series Instruction Manual page 139

5 SETTINGS 5.5 GROUPED ELEMENTS
CURRENT DIFF RESTRAINT 1:
This setting is used to select bias characteristics for the first slope.
CURRENT DIFF RESTRAINT 2:
This setting is used to select bias characteristics for the second slope.
CURRENT DIFF BREAK PT:
This setting is used to select an intersection point between the two slopes.
CURRENT DIFF DTT:
This setting is used to Enable/Disable the sending of DTT by current differential element on per single-phase basis to
remote relays. To allow the L90 protection system to restart from Master-Master to Master-Slave mode (very important on
three-terminal applications), must be set to "Enabled".
CURR DIFF DTT
CURRENT DIFF KEY DTT:
This setting is used to select additional protection element (i.e distance element or breaker failure), which key the DTT
besides the current differential element on per three-phase basis.
5
GE Power Management L90 Line Differential Relay 5-55