ABB Relion, Техническое руководство

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9.2.6 Monitored data
Table 164: OV2PTOV (59) Monitored data
Name Type Values (Range) Unit Description
V_A REAL - kV Voltage in phase A
V_B REAL - kV Voltage in phase B
V_C REAL - kV Voltage in phase C
9.2.7 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
> ⋅
(%) ( ) / 3
EQUATION1610 V2 EN
(Equation 79)
and operation for phase-to-phase voltage over:
Vpickup (%) VBase(kV)
> ×
EQUATION1992 V1 EN
(Equation 80)
Section 9
1MRK 502 048-UUS A
Voltage protection
290
Technical manual