ABB Relion 650 Series Technical Manual page 241

1MRK 506 326-UUS B
Name Values (Range)
TD1 0.05 - 1.10
OperationStep2 Disabled
Enabled
OpMode2 1 out of 3
2 out of 3
3 out of 3
Pickup2 1 - 100
t2 0.000 - 60.000
Table 167: UV2PTUV (27) Non group settings (basic)
Name Values (Range)
GlobalBaseSel 1 - 6
ConnType PhN DFT
PhN RMS
PhPh DFT
PhPh RMS
7.1.6 Monitored data
Table 168: UV2PTUV (27) Monitored data
Name
V_A
V_B
V_C
7.1.7 Operation principle
Two-step undervoltage protection (UV2PTUV ,27) is used to detect low power system voltage.
UV2PTUV (27) has two voltage measuring steps with separate time delays. If one, two or three
phase voltages decrease below the set value, a corresponding PICKUP signal is generated.
UV2PTUV (27) can be set to PICKUP/TRIP based on
measured voltages, being below the set point. If the voltage remains below 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.
UV2PTUV (27) can be set to measure phase-to-ground fundamental value, phase-to-phase
fundamental value, phase-to-ground true RMS value or phase-to-phase true RMS value. The choice
of the measuring is done by the parameter
percent of base voltage which is set in kV phase-to-phase voltage. This means operation for
phase-to-ground voltage under:
Line distance protection REL650
Technical manual
Unit Step
- 0.01
- -
- -
%VB 1
s 0.001
Unit Step
- 1
- -
Type Values (Range)
REAL -
REAL -
REAL -
© Copyright 2011 ABB Power Grids. All rights reserved
Default Description
0.05 Time multiplier for the inverse time delay
for step 1
Enabled Enable execution of step 2
1 out of 3 Number of phases required to operate (1
of 3, 2 of 3, 3 of 3) from step 2
50 Voltage start value (DT & IDMT) in % of
VBase for step 2
5.000 Definie time delay of step 2
Default Description
1 Selection of one of the Global Base Value
groups
PhN DFT Group selector for connection type
Unit Description
kV Voltage in phase A
kV Voltage in phase B
kV Voltage in phase C
1 out of 3 , 2 out of 3 or 3 out of 3 of the
ConnType . The voltage related settings are made in
Section 7
Voltage protection
PID-2720-MONITOREDDATA v5
M15326-3 v6
235