ABB Relion 670 Series Applications Manual page 232

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Voltage protection

LOVPTUV is used for signallization only through an output contact or through the event

recording function.

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.

All settings are in primary values or per unit. Set operate level per phase to typically 70% of the

global parameter

Advanced users settings

For advanced users the following parameters need also to be set. Set the length of the trip

pulse to typical

(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

UBase level. Set the time delay tTrip =5-20 seconds.

tPulse =0.15 sec. Set the blocking time tBlock to block Loss of voltage check

tRestore to 3 - 40 seconds.

1MRK 511 401-UEN Rev. K

SEMOD171929-4 v5

SEMOD171929-8 v4

Bay control REC670

Application manual

Relion rec670