GE L90 Instruction Manual page 458

GROUPED ELEMENTS
5
For phase distance zone 2, there is a provision to start the zone timer with other distance zones or loop the pickup
flag to avoid prolonging phase distance zone 2 operation when the fault evolves from one type to another or
migrates from the initial zone to zone 2. Assign the required zones in the trip output function to accomplish this
functionality.
5-234
Figure 5-120: Phase distance zone 1 OP logic
Figure 5-121: Phase distance zone 2 OP logic
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS