9.2.6 Monitored dataTable 147:OV2PTOV (59) Monitored dataName Type Values (Range) Unit DescriptionV_A REAL - kV Voltage in phase AV_B REAL - kV Voltage in phase BV_C REAL - kV Voltage in phase C9.2.7 Operation principleTwo step overvoltage protection OV2PTOV (59) is used to detect high power systemvoltage. OV2PTOV (59) has two steps with separate time delays. If one-, two- or three-phase voltages increase above the set value, a corresponding PICKUP signal is issued.OV2PTOV (59) can be set to PICKUP/TRIP, based on 1 out of 3, 2 out of 3 or 3 out of3 of the measured voltages, being above the set point. If the voltage remains above theset value for a time period corresponding to the chosen time delay, the correspondingtrip signal is issued.The time delay characteristic is settable for step 1 and can be either definite or inversetime delayed. Step 2 is always definite time delayed.The voltage related settings are made in percent of the global set base voltage VBase,which is set in kV, phase-to-phase.OV2PTOV (59) can be set to measure phase-to-ground fundamental value, phase-to-phase fundamental value, phase-to-ground RMS value or phase-to-phase RMS value.The choice of measuring is done by the parameter ConnType.The voltage related settings are made in percent of base voltage which is set in kV phase-to-phase voltage. OV2PTOV (59) will operate if the voltage gets higher than the setpercentage of the set global base voltage VBase. This means operation for phase-to-ground voltage over:Vpickup VBase kV> ⋅(%) ( ) / 3EQUATION1610 V2 EN (Equation 73)and operation for phase-to-phase voltage over:Vpickup (%) VBase(kV)> ×EQUATION1992 V1 EN (Equation 74)Section 9 1MRK 502 043-UUS BVoltage protection260Technical Manual
