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350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION
CHAPTER 6: SETPOINTS
Phase overvoltage
The phase OV protection can be used to protect voltage sensitive feeder loads and circuits
against sustained overvoltage conditions. The protection can be used to either cause a
trip, or generate an alarm when the voltage exceeds a specified voltage value for the
specified time delay.
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 OV
PH OV FUNCTION
Range: Disabled, Alarm, Latched Alarm, Trip
Default: Disabled
The selection of the Latched Alarm, Alarm, or Trip setting enables the Phase OV function.
The output relay #1 “Trip” will operate, if the function is selected as a Trip, and the phase
voltages from the selected “PH OV PHASES” combination are above the PH OV PKP
setting for a time greater than the selected PHASE OV DELAY time. The “ALARM” LED will
not turn on if the phase OV function is set to Trip. The “ALARM” LED will flash upon the OV
operating condition, with the phase OV selected as Alarm, and will self-reset, when this
operating condition clears. If Latched Alarm is selected as a phase OV function, the
“ALARM” LED will flash during the OV condition and will stay “ON” after the condition
clears, until the reset command is initiated. The output relay #1 “Trip” will not operate if
the Latched Alarm or Alarm setting is selected. Any or all of the output relays 3 to 6 can
be selected to operate when the phase OV function is selected as Latched Alarm, Alarm,
or Trip.
PH OV PKP
Range: 0.00 to 1.25 x VT in steps of 0.01
Default: 1.25 x VT
This setting defines the phase OV pickup level, and it is usually set to a level above which
some voltage sensitive loads and feeder components may experience overexcitation
and dangerous overheating conditions.
PH OV DELAY
Range: 0.1 to 600.0 sec in steps of 0.1
Default: 2.0 s
This setting specifies the time delay before OV operation.
PH OV PHASES
Range: Any One, Any Two, All Three
Default: Any One
This setting selects the combination of overvoltage conditions with respect to the
number of phase voltages over the overvoltage pickup setting.
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 a Phase OV
condition. The selection of 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
Element 1 to 16
Default: Off
Three blocking inputs are provided in the Phase OV menu. One blocking input “high” is
enough to block the function. The available selections for each block include Contact
input, Virtual Input, Remote Input, or Logic Element.