/PERATING INSTRUCTIONS
3$
6
# ' #
)
) ) N , N
/NLY FOR DEFINITE TIME PROTECTION
0ICKUP THRESHOLD ) REFERRED TO THE RATED LINE CURRENT
AS SET UNDER ADDRESS
3MALLEST SETTING VALUE
)
. LINE
,ARGEST SETTING VALUE
)
. LINE
4
)
S
$ELAY TIME FOR ) STAGE
3MALLEST SETTING VALUE
S
,ARGEST SETTING VALUE
S
AND
0
NO TRIP WITH ) STAGE
7HEN SETTING TO
INVERSE TIME
OVERCURRENT PROTEC
TION IT MUST BE CONSIDERED THAT ACCORDING TO )%#
THE PROTECTION PICKS UP ONLY WHEN MORE
THAN TIMES THE SET VALUE IS EXCEEDED
4HE TIME SETTING CORRESPONDS TO TIMES THE USUAL
TIME MULTIPLIER 4- EG
4
0
S MEANS 4-
THUS FOR NORMAL INVERSE
T
TRIP
S TRIPPING TIME AT TIMES SET VALUE )
P
7ITH THE DEFINITE TIME CHARACTERISTIC THE FUNDAMENTAL
WAVES OF THE MEASURED CURRENTS ARE EVALUATED FOR
PICKUP 7HEN ONE OF THE
INVERSE TIME
CHARACTERIS
TICS IS SELECTED A CHOICE CAN BE MADE WHETHER THE
FUNDAMENTAL WAVES
7)4(/54 (!2-/.)#
S OF THE
MEASURED CURRENTS ARE FORMED FOR EVALUATION OR IF
THE TRUE RMS VALUES
7)4( (!2-/.)#3
ARE CALCU
LATED !S THE RELAY IS USED AS SHORTCIRCUIT PROTECTION
THE PRESET VALUE IS RECOMMENDED )F THE TIME GRAD
ING IS TO BE COORDINATED WITH CONVENTIONAL RELAYS
WHICH OPERATE WITH TRUE RMS VALUES THEN
7)4(
(!2-/.)#3
CAN BE ADVANTAGEOUS
) P
) ) N , N
/NLY FOR INVERSE TIME PROTECTION
0ICKUP THRESHOLD )P REFERRED TO THE RATED LINE CURRENT
AS SET UNDER ADDRESS
3MALLEST SETTING VALUE
)
. LINE
,ARGEST SETTING VALUE
)
. LINE
4
) P
S
4IME MULTIPLIER
3MALLEST SETTING VALUE
S
,ARGEST SETTING VALUE
S
2 - 3
& / 2 - ! 4
7 ) 4 ( / 5 4
( ! 2 - / .
7 ) 4 (
( ! 2 - / . ) # 3
4HE FUNDAMENTAL WAVES OF THE MEASURED CURRENTS
ARE EVALUATED BY A &OURIER FILTER
4HE TRUE RMS VALUES OF THE MEASURED CURRENTS ARE
EVALUATED ONLY FOR INVERSE TIME CHARACTERISTICS
/NLY FOR INVERSE TIME PROTECTION
!DDRESS DETERMINES WHICH STAGE IS EFFECTIVE IF
THE CIRCUIT BREAKER IS MANUALLY CLOSED ! PREREQUI
SITE IS THAT THE MANUAL CLOSE COMMAND FOR THE
BREAKER IS REPEATED VIA A BINARY INPUT TO THE RELAY SO
THAT IT IS INFORMED ABOUT MANUAL CLOSING OF THE BREAK
ER
).%&&%#4)6%
MEANS THAT THE STAGES OPERATE AC
CORDING TO THE SETTINGS IN ADDRESSES TO
- ! . # , / 3 %
) . % & & % # 4 ) 6 %
)
5 . $ % , ! 9 % $
/VERCURRENT STAGE WHICH IS EFFECTIVE DURING MANUAL
CLOSING OF THE CIRCUIT BREAKER
).%&&%#4)6%
IE STAGES OPERATE AS PARAMETERIZED
)
IE ) STAGE BUT WITHOUT DELAY 4)
))P
IE ) STAGE DEFINITE TIME OR )
P
STAGE
INVERSE TIME BUT WITHOUT DELAY
) ) P
5 . $ % , ! 9 % $
Summary of Contents for 7SD502
Page 148: ... PPENDIX 3 6 PPENDIX ENERAL DIAGRAMS ONNECTION DIAGRAMS 4ABLES ...
Page 176: ... 3 6 ...
