Loss Of Voltage Check Lovptuv - ABB REL670 2.2 IEC Applications Manual

1MRK 506 369-UEN B
10.6
10.6.1
Line distance protection REL670 2.2 IEC
Application manual
UDTrip: The voltage differential level required for tripping is set with this
parameter. For application on capacitor banks the setting will depend of the
capacitor bank voltage and the number of elements per phase in series and parallel.
Capacitor banks must be tripped before excessive voltage occurs on the healthy
capacitor elements. The setting values required are normally given by the capacitor
bank supplier. For other applications it has to be decided case by case. For fuse
supervision normally only the alarm level is used.
tTrip: The time delay for tripping is set by this parameter. Normally, the delay does
not need to be so short in capacitor bank applications as there is no fault requiring
urgent tripping.
tReset: The time delay for reset of tripping level element is set by this parameter.
Normally, it can be set to a short delay as faults are permanent when they occur.
For the advanced users following parameters are also available for setting. Default
values are here expected to be acceptable.
U1Low: The setting of the undervoltage level for the first voltage input is decided
by this parameter. The proposed default setting is 70%.
U2Low: The setting of the undervoltage level for the second voltage input is
decided by this parameter. The proposed default setting is 70%.
tBlock: The time delay for blocking of the function at detected undervoltages is set
by this parameter.
UDAlarm: The voltage differential level required for alarm is set with this
parameter. For application on capacitor banks the setting will depend of the
capacitor bank voltage and the number of elements per phase in series and parallel.
Normally values required are given by capacitor bank supplier.
For fuse supervision normally only this alarm level is used and a suitable voltage
level is 3-5% if the ratio correction factor has been properly evaluated during
commissioning.
For other applications it has to be decided case by case.
tAlarm: The time delay for alarm is set by this parameter. Normally, few seconds
delay can be used on capacitor banks alarm. For fuse failure supervision
(SDDRFUF) the alarm delay can be set to zero.

Loss of voltage check LOVPTUV

Identification
Function description
Loss of voltage check
Voltage protection
IEC 61850 IEC 60617
identification identification
LOVPTUV -
Section 10
SEMOD171868-1 v2
SEMOD171954-2 v2
ANSI/IEEE C37.2
device number
27
555