/PERATING INSTRUCTIONS
3*
6
# ' #
4ESTING THE EARTH FAULT DETECTION
4HE DISPLACEMENT VOLTAGE DETECTION CAN BE TESTED
WHEN THE EARTH FAULT DETECTION IS ACTIVATED ADDRESS
#ONDITIONS ARE THAT THE EARTH FAULT DETECTION IS
CONFIGURED
%8)34
ADDRESS SEE 3ECTION
AND THAT THE RELAY GETS THE INFORMATION UNDER AD
DRESS THAT ITS VOLTAGE INPUTS ARE CONNECTED WITH
PHASE TO EARTH VOLTAGES OF THE SWITCHGEAR
) THE RELAY IS CONNECTED TO
THREE
PHASE TO EARTH
VOLTAGES THE RELAY CALCULATES THE DISPLACEMENT VOLT
AGE BY FORMING THE SUM OF THE VECTORS OF THE PHASE
TO EARTH VOLTAGES ACCORDING TO THE FOLLOWING FORMU
LA
5
%
o
\5
5
5
\
4HUS THE PROTECTION FUNCTION CAN BE TESTED USING A
THREE PHASE VOLTAGE SOURCE WITH INDIVIDUALLY CON
TROLLED PHASE VOLTAGES /NE OF THE THREE VOLTAGES IS
DECREASED STARTING WITH RATED VOLTAGE UNTIL THE VOLT
AGE TRIANGLE IS SO DEFORMED THAT THE PROTECTION PICKS
UP 4HIS HAPPENS ACCORDING TO ABOVE FORMULA WHEN
DECREASING THE VOLTAGE BY
o
OF THE PARAMETERIZED
PICK UP THRESHOLD 5E CAL ADDRESS %VEN
TUALLY THE THRESHOLD HAS TO BE SET LOWER FOR THE TEST
)F TWO PHASE TO EARTH VOLTAGES ARE CONNECTED THE
DISPLACEMENT VOLTAGE 5
EN
MUST BE CONNECTED ADDI
TIONALLY 4HE RELAY MUST BE INFORMED OF THE CONNEC
TION MODE DURING CONFIGURATION ADDRESS )N
THIS CASE THE DISPLACEMENT VOLTAGE IS DIRECTLY PRO
CESSED AS IT IS AVAILABLE AT THE TERMINALS FOR 5
%
3LOWLY INCREASE THE TEST VOLTAGE UNTIL THE PROTECTION
PICKS UP
R
AFTER THE MEASURING TIME AND THE DELAY TIME 4 %
& S PARAMETERIZED UNDER ADDRESS AN
NUNCIATION
5% &AULT
UPON DELIVERY ,%$ AND
SIGNAL RELAY RELAY PICK UP
R
AFTER 4 5% S ADDRESS ANNUNCIATION
5% 4RIP
,%$ AND SIGNAL RELAY IF TRIP BY
EARTH FAULT PROTECTION IS RELEASED UNDER ADDRESS
% &,4 $%4 7)4( 5% /2 )%%
R
COMMAND RELAY
$ISCONNECT VOLTAGE
!TTENTION
)F SETTING VALUES HAVE BEEN CHANGED FOR
THESE TESTS MAKE SURE THAT THE ORIGINAL SETTINGS ARE
RESTORED ADDRESSES TO
-ODELS 3*
J JJJJ
OR
PROVIDE THE HIGH
LY SENSITIVE EARTH CURRENT DETECTION STAGES WHICH CAN
BE TEST AS FOLLOWS
4HE CURRENT STAGES )%%4 )%% ADDRESSES
AND FURTHERMORE )%%4 )%% AD
DRESS AND IF DEFINITE TIME MODE IS SE
LECTED UNDER ADDRESS )%%P4 )%%P AD
DRESSES AND IF INVERSE TIME MODE IS SE
LECTED UNDER ADDRESS ARE TESTED IN A SIMILAR
WAY AS THE EARTH OVERCURRENT TIME PROTECTION 3EC
TIONS TO "UT THE FOLLOWING MUST BE OB
SERVED
4HE TEST CURRENT IS INJECTED ON THE MEASURED VALUE
INPUT FOR THE HIGH SENSITIVITY EARTH FAULT PROTECTION
/THERWISE THIS FUNCTION CANNOT OPERATE
4HIS MEASURED CURRENT INPUT IS SPECIALLY DESIGNED
FOR HIGHLY SENSITIVE MEASUREMENT 4HUS RESTRICTED
THRESHOLD VALUES ARE AVAILABLE ONLY AND ITS INPUT
RATING IS INDEPENDENT OF THE RATED CURRENT OF THE
RELAY
#AUTION
4HE THERMAL CAPABILITY OF THE MEASURED
CURRENT INPUT FOR HIGHLY SENSITIVE EARTH FAULT
PROTECTION IS ! CONTINUOUS 4EST CUR
RENTS LARGER THAN ! MAY OVERLOAD AND
DAMAGE THE MEASURED INPUT CIRCUITS IF
APPLIED CONTINUOUSLY REFER TO 3ECTION
FOR OVERLOAD CAPABILITY /BSERVE A
COOLING DOWN PERIOD
)F ONE OR MORE STAGES ARE SET TO OPERATE DIRECTIONAL
THE VOLTAGE 5
%
MUST BE AVAILABLE WHICH IS NEEDED
FOR DIRECTIONAL DETERMINATION 7HEN THE DISPLACE
MENT VOLTAGE IS DIRECTLY CONNECTED TO THE RELAY AND
THE RELAY IS CORRECTLY INFORMED DURING CONFIGURATION
ADDRESS
0 % 5% 02/4 0 %
THE DIRECTION
CAN BE EASILY DETERMINED
&OR DIRECTIONAL DETERMINATION THE CURRENT COMPO
NENT )%%P$)2 ADDRESS IN THE DIRECTION
WHICH IS DETERMINED BY THE SETTING UNDER ADDRESSES
0() #/22 AND %& -%!3 MUST ALSO BE
EXCEEDED -EASUREMENT IS FOR EXAMPLE NOT POSSI
BLE WHEN TEST CURRENT AND TEST VOLTAGE ARE IN PHASE
AND %& -%!3 IS SET
3). 0()
AND 0() #/22 IS SET TO
AS THE CURRENT VECTOR THEN LIES EXACTLY BETWEEN THE
DIRECTIONAL CHARACTERISTICS FOR FORWARD AND REVERSE
DIRECTION
)F THE RELAY IS CONNECTED TO THREE PHASE TO EARTH
VOLTAGE TRANSFORMERS AND IT IS INFORMED DURING CON
FIGURATION ADDRESS 0( % #!,# 0( % THE
RELAY CALCULATES THE DISPLACEMENT VOLTAGE FROM THE
PHASE TO EARTH VOLTAGE )N THIS CASE TESTING OF THE
EARTH FAULT PROTECTION FOR NON EARTHED NETWORKS IS
NOT COMPLETELY POSSIBLE WITH CONVENTIONAL TEST SETS
SINCE THE SIMULATION OF AN EARTH FAULT REQUIRES A COM
PLETE DISPLACEMENT OF THE VOLTAGE TRIANGLE 4HE COR
RECT RELATIONSHIP AND POLARITY OF THE MEASURING TRANS
FORMER CONNECTIONS ESSENTIAL FOR PROPER EARTH FAULT
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