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350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION
CHAPTER 6: SETPOINTS
Phase instantaneous
overcurrent
protection
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
The selection of the Latched Alarm, Alarm, or Trip setting enables the Phase IOC function.
The output relay #1 “Trip” will operate when the Trip function is selected, and the Phase
IOC operates. The “ALARM” LED will not turn on if the IOC operates when set to function
Trip. The “ALARM” LED will flash upon phase IOC operation, and with the IOC function
selected as Alarm, will self-reset when the operation clears. If Latched Alarm is selected,
the “ALARM” LED will flash during IOC operation, and will stay “ON” after the operation
clears, until the Reset command is initiated. The output relay #1 “Trip” will not operate if
the Latched Alarm or Alarm function is selected.
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.
OUTPUT RELAY 3 to 6
Range: Do not operate, Operate
Default: Do not operate
Any or all of the output relays 3 to 6 can be selected to operate upon Phase IOC
operation. Relay outputs operation is available no matter whether Latched Alarm, Alarm,
or Trip function is selected.
BLOCK 1/2/3
Range: Off, Contact Input 1 to 10[8], Virtual Input 1 to 32, Remote Input 1 to 32, Logic
Elements 1 to 16
Default: Off
Three blocking inputs are provided in the Phase IOC menu. When any one of the selected
blocking inputs - Contact input, Virtual Input, Remote Input, or Logic Element - is turned
on, the phase IOC function will be blocked.
