ABB RELION 670 Series Technical Manual page 609

1MRK 502 066-UUS B
Table 337: UV2PTUV (27) Non group settings (basic)
Name Values (Range)
ConnType PhN DFT
PhPh RMS
PhN RMS
PhPh DFT
GlobalBaseSel 1 - 12
9.1.6 Monitored data
Table 338: UV2PTUV (27) Monitored data
Name
VA
VB
VC
9.1.7 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. To avoid
an unwanted trip due to disconnection of the related high voltage equipment, a voltage controlled
blocking of the function is available, that is, if the voltage is lower than the set blocking level the
function is blocked and no PICKUP or TRIP signal is generated.The time delay characteristic is
individually chosen for each step and can be either definite time delay or inverse time delay.
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:
Vpickup
EQUATION1606 V1 EN-US
and operation for phase-to-phase voltage under:
Vpickup
EQUATION1991-ANSI V1 EN-US
Technical manual
Unit
-
-
Type
REAL
REAL
REAL
< ×
(%) VBase kV ( )
3
< ×
(%) VBase(kV)
Step Default
- PhN DFT
1 1
Values (Range) Unit
- kV
- kV
- kV
1 out of 3 , 2 out of 3 or 3 out of 3 of the
ConnType . The voltage related settings are made in
Voltage protection
Description
Group selector for connection type
Selection of one of the Global Base Value
groups
Description
Voltage in phase A
Voltage in phase B
Voltage in phase C
Section 9
PID-3586-MONITOREDDATA v5
M15326-3 v8
(Equation 168)
(Equation 169)
603