GE UR Series Instruction Manual page 143

5 SETTINGS 5.5 GROUPED ELEMENTS
Co-ordination features are included to ensure satisfactory operation when high speed 'automatic reclosure (AR)' is
employed. The setting allows the overcurrent setting to be below the expected load current seen after
AR CO-ORD DELAY
reclose. Co-ordination is achieved by the POS SEQ OV element picking up and blocking the trip path, before the
AR CO-
times out. The setting is normally enabled. It is disabled if high speed AR is implemented.
ORD DELAY AR CO-ORD BYPASS
The positive sequence undervoltage pickup setting is based on phase to neutral quantities. If Delta VTs are used, then this
per unit pickup is based on the ( setting) / 3 .
VT SECONDARY
5
Figure 5–20: LINE PICKUP LOGIC
GE Power Management L90 Line Differential Relay 5-59