GE 850 User Manual

6–34 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CURRENT ELEMENTS CHAPTER 6: PROTECTION SETPOINTS
Ground Instantaneous Overcurrent Protection (50G)
The 850 relay is equipped with the Ground Instantaneous Overcurrent protection element.
The settings of this function are applied to the measured Ground current for producing
Pickup and Trip flags. The Ground IOC Pickup flag is asserted when the Ground current is
above the PKP value. The Ground IOC Operate flag is asserted if the element stays picked-
up for the time defined by the Ground IOC PKP Delay setting. If the Pickup time delay is set
to 0.000 seconds, the Pickup and Operate flags will be asserted at the same time. The
element drops from Pickup without operation if the Ground current drops below 97 to 98%
of the Pickup value.
Path: Setpoints > Protection > Group 1(6) > Current > Ground IOC 1(X)
FUNCTION
Range: Disabled, Trip, Alarm, Latched Alarm, Configurable
Default: Disabled
SIGNAL INPUT
Range: dependant upon the order code
Default: CT Bank 1-J1
This setting provides the selection for the current input bank. The default bank names
can be changed in Setpoints > System > Current Sensing > [Name] > CT Bank Name.
PICKUP
Range: 0.050 to 30.000 x CT in steps of 0.001 x CT
Default: 1.00 x CT
DIRECTION
Range: Disabled, Forward, Reverse or Disabled, Ntrl Dir OC [1-2] FWD, Ntrl Dir OC [1-2]
REV, Dependant on order code
Default: Disabled
PICKUP DELAY
Range: 0.000 to 6000.000 s in steps of 0.001 s
Default: 0.000 s
DROPOUT DELAY
Range: 0.000 to 6000.000 s in steps of 0.001 s
Default: 0.000 s
BLOCK
Range: Off, Any FlexLogic operand
Default: Off
OUTPUT RELAY X
For details see Common Setpoints
.
EVENTS
Range: Enabled, Disabled
Default: Enabled
TARGETS
Range: Self-reset, Latched, Disabled
Default: Self-reset

GE 850 Specifications

General

Brand	GE
Model	850
Category	Protection Device
Language	English