GE Feeder Management Relay 750 User Manual

GE Multilin 750/760 Feeder Management Relay 5-37
5 SETPOINTS 5.6 S5 PROTECTION
5
Select "Disabled" for the PHASE TIME OC 1 VOLT RESTRAINT setpoint if voltage restraint is not required. When set to
"Enabled", this feature lowers the pickup value of each individual phase time overcurrent element in a fixed relationship
with the corresponding phase input voltage. When voltage restraint is enabled, it is not allowed to change the pickup cur-
rent setting if the manual close blocking, cold load pickup blocking or autoreclose features are controlling the protection. If
the
BUS INPUT VT TYPE is selected to "None", this feature is automatically disabled.
Figure 5–5: VOLTAGE RESTRAINT CHARACTERISTIC FOR PHASE TOC
If voltage restraint is enabled, the adjusted pickup, calculated by adjusting the pickup value by the multi-
plier, will not fall below 0.05 × CT, which is the lowest value for the
PHASE TIME OC PICKUP.
Figure 5–6: PHASE TOC LOGIC (1 OF 2)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
0
818784A4.CDR
Multiplier for Pickup Current
Phase-Phase Voltage ÷ VT Nominal Phase-phase Voltage
NOTE
Courtesy of NationalSwitchgear.com

GE Feeder Management Relay 750 Specifications

General

Brand	GE
Model	Feeder Management Relay 750
Category	Protection Device
Language	English