Monitored Data - ABB Relion Technical Manual

Section 9
Voltage protection
9.2.6
9.2.7
290

Monitored data

Table 164: OV2PTOV (59) Monitored data
Name Type
V_A REAL
V_B REAL
V_C REAL
Operation principle
Two step overvoltage protection OV2PTOV (59) is used to detect high power system
voltage. 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 of 3 of
the measured voltages, being above the set point. If the voltage remains above the set value
for a time period corresponding to the chosen time delay, the corresponding trip signal is
issued.
The time delay characteristic is settable for step 1 and can be either definite or inverse time
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 set
percentage of the set global base voltage VBase. This means operation for phase-to-
ground voltage over:
> ⋅
Vpickup (%) VBase kV (
EQUATION1610 V2 EN
and operation for phase-to-phase voltage over:
> ×
Vpickup (%) VBase(kV)
EQUATION1992 V1 EN
Values (Range)
-
-
-
) / 3
1MRK 502 048-UUS A
Unit Description
kV Voltage in phase A
kV Voltage in phase B
kV Voltage in phase C
Technical manual
(Equation 79)
(Equation 80)