/PERATING INSTRUCTIONS
3*
6
# ' #
3ETTINGS FOR HIGHLY SENSITIVE EARTH FAULT PROTECTION
ADDRESS BLOCK
(IGHLY SENSITIVE EARTH FAULT DETECTION CAN BE USED IN
ISOLATED OR ARC COMPENSATED NETWORKS TO DETECT AN
EARTH FAULT 4HE FUNCTION IS ONLY POSSIBLE IF THE RE
SPECTIVE CONFIGURATION PARAMETER 3ECTION AD
DRESS IS SET TO
%8)34
)F THE RELAY IS CONNECTED TO THE PHASE TO EARTH VOLT
AGES AND ADEQUATELY CONFIGURED ADDRESS
3ECTION EARTH FAULT DETECTION CAN BE USED TO
DETERMINE THE EARTH FAULTED PHASE
-ODELS 3*
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JJJ
AND
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PROVIDE
AN ADDITIONAL HIGHLY SENSITIVE EARTH CURRENT INPUT SO
THAT EARTH FAULT DIRECTION DISCRIMINATION IS POSSIBLE IN
SYSTEMS WITH ISOLATED AND ARC COMPENSATED STAR
POINT )N EFFECTIVELY GROUNDED OR LOW IMPEDANCE
EARTHED NETWORKS DETECTION OF HIGH RESISTANCE
EARTH FAULTS WITH VERY SMALL FAULT CURRENTS IS POSSIBLE
"ECAUSE OF ITS HIGH SENSITIVITY IT IS NOT SUITED FOR DE
TECTION OF HIGHER EARTH FAULT CURRENTS FROM ! AND
ABOVE AT THE RELAY TERMINALS FOR HIGH SENSITIVITY
EARTH FAULT PROTECTION &OR THOSE APPLICATIONS USE
THE OVERCURRENT TIME PROTECTION FOR EARTH CURRENTS AS
DESCRIBED IN 3ECTIONS AND
"EGINNING OF BLOCK %ARTH FAULT DETECTION FOR
NON EARTHED SYSTEMS
%!24(&!5,4
$%4%#4)/.
2
%ARTH FAULT DETECTION IN NON EARTHED SYSTEMS IS
/&&
SWITCHED OFF
/.
SWITCHED ON AND WILL TRIP
REQUIRED TO GIVE
!,!2- /.,9
NO TRIP
%& 02/4%#
/&&
/.
!,!2- /.,9
.
n
4HE HIGH REACTIVE CURRENT COMPONENT IN
COMPEN
SATED
NETWORKS AND THE UNAVOIDABLE AIR GAP OF THE
WINDOW TYPE CURRENT TRANSFORMERS OFTEN MAKE
COMPENSATION OF THE ANGLE ERROR OF THE CURRENT TRANS
FORMER NECESSARY 4HIS IS POSSIBLE THROUGH ADDRESS
ES TO 4HE MAXIMUM ANGLE ERROR & OF THE
CT WITH ITS ASSOCIATED CURRENT ) AS WELL AS ANOTHER
CT OPERATING POINT )& ABOVE WHICH THE ANGLE ER
ROR REMAINS PRACTICALLY CONSTANT ARE ENTERED FOR THE
ACTUALLY CONNECTED BURDEN 4HE RELAY THEN APPROXI
MATES WITH ADEQUATE ACCURACY TO THE CHARACTERISTIC
OF THE TRANSFORMER )N
ISOLATED
OR
EARTHED
NETWORKS
THIS ANGLE ERROR COMPENSATION IS NOT NECESSARY
#4 %22 )
!
3ECONDARY CURRENT FOR MAX ERROR ANGLE OF CURRENT
TRANSFORMER
3MALLEST SETTING VALUE
!
,ARGEST SETTING VALUE
!
m
n
#4 %22 &
%RROR ANGLE OF CURRENT TRANSFORMER AT )
3MALLEST SETTING VALUE
DEG
,ARGEST SETTING VALUE
DEG
m
n
ONLY FOR MODEL 3*
J JJJJ
JJJJ
ONLY FOR MODEL 3*
J JJJJJ
JJJ
AND
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