Loss Of Voltage Check Lovptuv (27) - ABB REC670 Applications Manual

Section 9
Voltage protection
9.5
9.5.1
9.5.2
9.5.3
9.5.3.1
258

Loss of voltage check LOVPTUV (27)

Identification
Function description
Loss of voltage check
Application
The trip of the circuit breaker at a prolonged loss of voltage at all the three phases is
normally used in automatic restoration systems to facilitate the system restoration after
a major blackout. Loss of voltage check (LOVPTUV, 27) generates a TRIP signal only
if the voltage in all the three phases is low for more than the set time. If the trip to the
circuit breaker is not required, LOVPTUV (27) is used for signallization only through
an output contact or through the event recording function.
Setting guidelines
Loss of voltage check (LOVPTUV, 27) is in principle independent of the protection
functions. It requires to be set to open the circuit breaker in order to allow a simple
system restoration following a main voltage loss of a big part of the network and only
when the voltage is lost with breakers still closed.
All settings are in primary values or per unit. Set operate level per phase to typically
70% of the global parameter VBase level. Set the time delay tTrip=5-20 seconds.
Advanced users settings
For advanced users the following parameters need also to be set. Set the length of the
trip pulse to typical tPulse=0.15 sec. Set the blocking time tBlock to block Loss of
voltage check (LOVPTUV, 27), if some but not all voltage are low, to typical 5.0
seconds and set the time delay for enabling the function after restoration tRestore to 3 -
40 seconds.
IEC 61850 IEC 60617
identification identification
LOVPTUV -
1MRK 511 401-UUS A
SEMOD171868-1 v2
SEMOD171954-2 v2
ANSI/IEEE C37.2
device number
27
SEMOD171876-4 v3
SEMOD171929-4 v5
SEMOD171929-8 v4
Bay control REC670 2.2 ANSI
Application manual