to the circuit breaker is not required, LOVPTUV is used for signallization only
through an output contact or through the event recording function.
7.4.3 Setting guidelines
Loss of voltage check (LOVPTUV) 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.
GlobalBaseSel: Selects the global base value group used by the function to define
(IBase), (UBase) and (SBase).
All settings are in primary values or per unit. Set operate level per phase to typically
70% of the global parameter UBase level. Set the time delay tTrip=5-20 seconds.
7.4.4 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), 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.
Section 7 1MRK 505 291-UEN A
Voltage protection
166
Application manual
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