/PERATING INSTRUCTIONS
3*
6
# ' #
3ETTINGS FOR UNDERVOLTAGE PROTECTION
ADDRESS BLOCK
5.$%2
6/,4!'%
"EGINNING OF THE BLOCK 5NDERVOLTAGE PROTECTION
2
5.$%26/,4'
/&&
/.
3WITCHING
/.
OF THE UNDERVOLTAGE PROTECTION
3WITCHING
/&&
OF THE UNDERVOLTAGE PROTECTION
UNDERVOLTAGE PROTECTION OPERATES BUT ISSUES
!,!2- /.,9
NO TRIP NO FAULT EVENT
!,!2- /.,9
.
n
5NDER ADDRESS IT HAS BEEN DETERMINED WHETH
ER PHASE TO EARTH VOLTAGES OR PHASE TO PHASE
VOLTAGES ARE CONNECTED TO THE RELAY AS MEASURING
QUANTITIES AND WHICH VOLTAGES SHALL BE EVALUATED
7HEN PHASE TO EARTH VOLTAGES ARE CONNECTED
THEN THE RELAY CAN CALCULATE THE PHASE TO PHASE
VOLTAGES AND USE THEM OPTIONALLY FOR CALCULATION BY
THE PROTECTION FUNCTION TOO $EPENDENT ON THE CON
FIGURATION UNDER ADDRESS ONLY THE RELEVANT PA
RAMETERS ADDRESSES AND FOR PHA
SE TO EARTH VOLTAGES OR AND FOR
PHASE TO PHASE VOLTAGES ARE SHOWN
&OR THE SETTINGS NO GENERALLY APPLICABLE VALUES CAN
BE GIVEN 4AKING INTO ACCOUNT THAT THE PROTECTION
SHALL IN THE FIRST PLACE PROTECT CONSUMERS FROM THE
CONSEQUENCES OF VOLTAGE DROPS AND PREVENT STABILITY
PROBLEMS THE SETTING VALUES WILL BE BETWEEN
AND OF THE RATED VOLTAGE 4HE TIME DELAYS HAVE
TO BE SET SUCH THAT VOLTAGE DROPS WHICH ENDANGER
THE STABILITY ARE TRIPPED 4HE TIME DELAYS SHOULD
HOWEVER BE LONG ENOUGH TO AVOID TRIPPING FOR PER
MISSIBLE SHORT TIME VOLTAGE DROPS
5 0( %
6
0ICK UP THRESHOLD OF THE 5 STAGE OF THE UNDERVOL
TAGE PROTECTION WHEN THE PHASE TO GROUND VOLT
AGES ARE PROCESSED
3ETTING RANGE
6 TO
6
m
n
5 0( 0(
6
0ICK UP THRESHOLD OF THE 5 STAGE OF THE UNDERVOL
TAGE PROTECTION WHEN THE PHASE TO PHASE VOLT
AGES ARE PROCESSED
3ETTING RANGE
6 TO
6
m
n
4HE UNDERVOLTAGE PROTECTION HAS TWO STAGES ! SHORT
TIME DELAY CAN BE ASSIGNED TO THE LOW SET STAGE
5 AND A LONGER TIME DELAY TO THE HIGH SET
STAGE 5 4HUS THE STABILITY CHARACTERISTIC OF THE
CONSUMER CAN BE APPROXIMATELY MATCHED
7HILE THE RESET THRESHOLD OF THE 5 STAGE IS FIXED AT
TIMES PICK UP THRESHOLD THE RESET THRESHOLD OF
THE 5 STAGE CAN BE PARAMETERIZED THROUGH THE RE
SET RATIO R 5
RESET
5
PICKUP
ADDRESSES AND
4HE FOLLOWING LIMITATION SHOULD BE OBSERVED
R X PARAMETERIZED PICK UP THRESHOLD 5
6
.OTE
)F THE RESET THRESHOLD PICK UP THRESHOLD X
RESET RATIO IS ERRONEOUSLY SET TO A VALUE LARGER THAN
6 THEN IT IS AUTOMATICALLY LIMITED TO 6 .O
ALARM IS GIVEN
R 0( %
2ESET RATIO R WHEN THE PHASE TO GROUND VOLTAGE
IS PROCESSED
3ETTING RANGE
TO
m
n
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