/PERATING INSTRUCTIONS
3*
6
# ' #
3ETTINGS FOR EARTH FAULT OVERCURRENT TIME PROTECTION
ADDRESS BLOCK
"EGINNING OF THE BLOCK /VERCURRENT TIME PROTECTION FOR
EARTH FAULTS
3WITCHING
/.
OF THE EARTH FAULT OVERCURRENT TIME PRO
TECTION
3WITCHING
/&&
OF THE EARTH FAULT OVERCURRENT TIME PRO
TECTION
/# 02/4
%!24(
2
/# %!24(
/.
/&&
.
n
!T FIRST THE HIGH SET OVERCURRENT STAGE )
%
IS SET
UNDER ADDRESSES TO IF USED IF NOT USED
SET 4 )% ADDRESS TO
0
&OR DETERMINATION
OF THE SETTING VALUES SIMILAR CONSIDERATIONS ARE VALID
AS FOR THE PHASE FAULT STAGE ) REFER TO 3ECTION
0ICK UP VALUE OF THE HIGH SET STAGE )
%
FOR EARTH FAULTS
3ETTING RANGE
TO
|
)
.
4RIP TIME DELAY OF THE HIGH SET STAGE )
%
3ETTING RANGE
S TO
S
OR
0
NO TRIP WITH )
%
FOR EARTH FAULTS
-EASUREMENT REPETITION
7ITH SETTING
9%3
A FURTHER HALF AC PERIOD IS EVALUATED
BEFORE THE PROTECTION PICKS UP 4HIS IS INTENDED FOR DIFFI
CULT MEASURING CONDITIONS
)%
))N
4 )%
S
-%!32%0%4
./
9%3
.
m
n
m
n
m
n
3* CAN BE USED AS DEFINITE TIME OVERCURRENT
PROTECTION OR INVERSE TIME OVERCURRENT PROTECTION
3ELECTION FOR EARTH FAULTS IS INDEPENDENT OF THAT FOR
PHASE FAULTS 4HE FUNCTION MODE HAS BEEN SELECTED
DURING CONFIGURATION IN 3ECTION ADDRESS
)N THIS BLOCK ONLY THOSE PARAMETERS ARE
AVAILABLE WHICH ARE ASSOCIATED WITH THE FUNCTION
MODE OF THE SELECTED OVERCURRENT TIME PROTECTION FOR
EARTH FAULTS
&OR EARTH FAULTS ALL PARAMETERS OF THE OVERCURRENT
TIME PROTECTION CAN BE SET SEPARATELY AND INDEPEN
DENTLY 4HIS ALLOWS SEPARATE TIME GRADING FOR EARTH
FAULTS WITH EG SHORTER TIMES
!DDRESSES AND ARE RELEVANT ONLY IN CASE
THE
DEFINITE TIME
CHARACTERISTIC HAS BEEN CHOSEN UN
DER ADDRESS #(!2!# %
$%&).)4% 4)-%
4HE MINIMUM EARTH FAULT CURRENT DETERMINES THE SET
TING OF THE OVERCURRENT STAGE )
%
4HE TIME DELAY 4 )% DEPENDS ON THE GRADING PLAN
FOR THE NETWORK WHICH CAN BE SEPARATE FOR EARTH
FAULTS
)F THE OVERCURRENT STAGE )
%
IS NOT USED THE PICK UP
VALUE )% CAN BE SET TO
0
SO THAT THE STAGE IS COM
PLETELY INEFFECTIVE 7HEN SETTING ONLY THE TIME DELAY
4 )% TO
0
THE STAGE OPERATES AND ANNUNCIATES
PICK UP BUT DOES NOT TRIP BECAUSE THE TIME WILL NEV
ER ELAPSE
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