/PERATING INSTRUCTIONS
3*
6
# ' #
7ITH ADDRESS TO THE DEVICE IS INSTRUCTED
AS TO HOW THE EARTH CURRENT AND VOLTAGE TRANSFORMER
ARE CONNECTED 4HIS INFORMATION IS IMPORTANT FOR THE
TREATMENT OF EARTH FAULTS IN EARTHED NETWORKS EARTH
LEAKAGE IN UNEARTHED NETWORKS AND THE MONITORING
OF MEASURED VALUES
)F THE VOLTAGE TRANSFORMER SET HAS E N OPEN DELTA
WINDINGS AND IF THESE ARE CONNECTED TO THE DEVICE
THEN THIS HAS TO BE RECORDED IN ADDRESS REFER
3ECTION 3INCE THE RATIO OF THE VOLTAGE TRANS
FORMERS IS NORMALLY
5
.PRIM
5
.SEC
5
.SEC
THE FACTOR 5PH5DELTA SECONDARY VALUES ADDRESS
SHALL BE SET AS
√
√
WHEN THE DEL
TA WINDINGS ARE CONNECTED )F THE RATIO IS DIFFERENT
EG WHEN THE DISPLACEMENT VOLTAGE IS FORMED BY IN
TERMEDIATE TRANSFORMERS THE FACTOR HAS TO BE SE
LECTED ACCORDINGLY
4WO POSSIBILITIES EXIST FOR THE EARTH CURRENT PATH
#ONNECTION OF THE EARTH CURRENT FROM THE STAR POINT
OF THE CURRENT TRANSFORMERS STANDARD CIRCUIT AR
RANGEMENT SEE ALSO !PPENDIX " &IGURE " OR
"
!DDRESS IS SET AS
)E)PH
#ONNECTION OF THE EARTH CURRENT FROM A SEPARATE
EARTH CURRENT DETECTION TRANSFORMER EG WINDOW
TYPE CURRENT TRANSFORMER FOR EARTH FAULT DETECTION
SEE ALSO !PPENDIX " EG &IGURE "
!DDRESS IS SET AS
LE
LPH
RATIO OF THE EARTH CURRENT #4
RATIO OF THE PHASE CURRENT #4S
%XAMPLE
0HASE CURRENT TRANSFORMERS
!!
7INDOW TYPE SUMMATION TRANSFORMER
!!
LE
LPH
5PH5DELTA
-ATCHING FACTOR FOR RESIDUAL VOLTAGE
3MALLEST SETTING VALUE
LARGEST SETTING VALUE
NORMALLY
m
n
RATED SECONDARY VOLTAGE OF VT PHASE WINDING
RATED SECONDARY VOLTAGE OF OPEN DELTA WINDING
-ATCHING FACTOR FOR EARTH CURRENT
FOR CONNECTION IN CT STARPOINT
FOR CONNECTION TO SEPARATE EARTH CURRENT
TRANSFORMER
3MALLEST SETTING VALUE
,ARGEST SETTING VALUE
)E)PH
m
n
WINDOW TYPE EARTH CT RATIO
PHASE CT RATIO
!N ADDITIONAL EARTH CURRENT INPUT IS AVAILABLE FOR
HIGH SENSITIVITY EARTH FAULT DETECTION IN MODELS
3*
J JJJJ
AND CONNECTION FROM A SEP
ARATE EARTH CURRENT TRANSFORMER EG WINDOW TYPE
CURRENT TRANSFORMER SEE ALSO !PPENDIX " EG &IG
URE "
!DDRESS IS SET AS
LEE
LPH
WINDOW TYPE EARTH CT RATIO
PHASE CT RATIO
%XAMPLE
0HASE CURRENT TRANSFORMERS
!!
7INDOW TYPE SUMMATION TRANSFORMER
!!
)%%
LPH
ONLY FOR MODEL 3*
J JJJJ
JJJJ
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