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CHAPTER 6: SETPOINTS
Phase instantaneous overcurrent protection (50P)
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
The 350 relay has two identical phase instantaneous overcurrent protection types per
Setpoint Group: Phase IOC1, and Phase IOC2. Each consists of three separate
instantaneous overcurrent elements; one per phase, with identical settings.
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to Chapter 3 - Working with the Keypad.
PATH:
SETPOINTS > S3 PROTECTION > SETPOINT GROUP 1(2) > PHASE IOC1(2)
PH IOC1/2 FUNCTION
Range: Disabled, Latched Alarm, Alarm, Trip
Default: Disabled
For details see
Common
PH IOC1/2 PKP
Range: 0.05 to 20.00 x CT in steps of 0.01 x CT
Default: 1.00 x CT
This setting sets the instantaneous overcurrent pickup level. For example, a PKP setting
of 0.9 x CT with 300:5 CT translates into 270A primary current.
PH IOC1/2 DELAY
Range: 0.00 to 300.00 sec in steps of 0.01 sec
Default: 0.00 sec
This setting provides selection for the time used to delay the protection operation.
PH IOC DIRECTION
Range: Disabled, Forward, Reverse
Default: Disabled
This setting provides control to the Phase IOC1(2) function in terms of permitting
operation upon fault conditions in the selected current flow direction, and blocking it,
when faults occur in the opposite direction.
A special case is considered when fault direction is undefined. Then "BLK OC DIR UN"
setting in Phase Directional defines the fault direction.
OUTPUT RELAY X
For details see
Common
BLOCK 1/2/3
For details see
Common
setpoints.
setpoints.
setpoints.
S3 PROTECTION
6–43
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