/PERATING INSTRUCTIONS
3*
6
# ' #
0HASE EARTH VOLTAGE OF HEALTHY PHASES WHICH WILL
SAFELY BE EXCEEDED UNDER EARTH FAULT CONDITIONS
3MALLEST SETTING VALUE
6
,ARGEST SETTING VALUE
6
5PH
6
m
n
5E MEAS
6
m
n
4HRESHOLD VALUE FOR MEASURED DISPLACEMENT VOLTAGE
5E
3MALLEST SETTING VALUE
6
,ARGEST SETTING VALUE
6
4HRESHOLD VALUE FOR THE CALCULATED DISPLACEMENT VOLT
AGE 5E
o
|
5
3MALLEST SETTING VALUE
6
,ARGEST SETTING VALUE
6
5E CAL
6
m
n
$URATION OF DISPLACEMENT VOLTAGE AFTER WHICH EARTH
FAULT IS DETECTED AND ANNUNCIATED
3MALLEST SETTING VALUE
S
,ARGEST SETTING VALUE
S
AND
0
NO ALARM
4 %&
S
m
n
4IME DELAY FOR TRIPPING WITH 5E ONLY IF SWITCHED
/.
3MALLEST SETTING VALUE
S
,ARGEST SETTING VALUE
S
AND
0
NO TRIP
4 5%
S
m
)N MODEL 3*
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A TWO STAGE CUR
RENT TIME CHARACTERISTIC CAN BE SET IN ORDER TO DETECT
EARTH CURRENTS UNDER ADDRESSES TO %ACH
STAGE CAN OPERATE DIRECTIONAL OR NON DIRECTIONAL
4HE MAGNITUDE OF THE EARTH CURRENT IS DECISIVE FOR
PICK UP OF THESE STAGES 4HEY ARE USED IN CASES
WHERE THE MAGNITUDE OF THE EARTH CURRENT IS THE
MEAN CRITERION OF THE EARTH FAULT THEREFORE PREFER
ABLY IN
SOLIDLY EARTHED
OR
LOW IMPEDANCE EARTHED
SYSTEMS OR FOR
ELECTRICAL MACHINES
IN BUS BAR
CONNECTION WITH ISOLATED SYSTEMS WHERE THE HIGH
CAPACITIVE CURRENT OF THE SYSTEM CAN BE EXPECTED IN
CASE OF MACHINE EARTH FAULT BUT ONLY AN INSIGNIFICANT
EARTH CURRENT IN CASE OF A SYSTEM EARTH FAULT BECAUSE
OF THE LOW MACHINE CAPACITANCE
4HE POSITION OF THE DIRECTIONAL CHARACTERISTICS CAN BE
SET UNDER ADDRESSES AND TO SUIT THE APPLI
CATION %XPLANATIONS ARE GIVEN BELOW BEFORE THE IL
LUSTRATION OF THESE PARAMETER ADDRESSES
4HE HIGH VALUE STAGE IS DESIGNATED WITH )%%
PICK UP VALUE IN ADDRESS )T CAN BE DELAYED
BY 4 )%% ADDRESS AND LEAD TO ANNUNCI
ATION OR EVEN TO TRIP 4HE LATTER IS ONLY POSSIBLE IF TRIP
HAS BEEN SET IE UNDER ADDRESS %& 02/4%#
/.
4HE DIRECTION OF THIS STAGE CAN BE SET TO
&/2
7!2$3
2%6%23%
OR
./. $)2%#4)/.!,
UNDER
ADDRESS
)%%
!
m
n
4HRESHOLD VALUE FOR )
%%
STAGE
3MALLEST SETTING VALUE
!
,ARGEST SETTING VALUE
!
ONLY FOR MODEL 3*
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