Siemens SIPROTEC 7SJ531 - Page 49

-ETHOD OF OPERATION3*
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 -ETHOD OF OPERATION
 /PERATION OF COMPLETE UNIT
4HE NUMERICAL LINE AND MOTOR PROTECTION RELAY
3)02/4%# 3* IS EQUIPPED WITH A POWERFUL AND
PROVEN 
BIT MICROPROCESSOR 4HIS PROVIDES FULLY
DIGITAL PROCESSING OF ALL FUNCTIONS FROM DATA ACQUISI
TION OF MEASURED VALUES TO THE TRIP SIGNALS FOR THE CIR
CUIT BREAKERS
&IGURE  SHOWS THE BASIC STRUCTURE OF THE UNIT
4HE TRANSDUCERS OF THE MEASURED VALUE INPUT SEC
TION -% TRANSFORM THE CURRENTS AND VOLTAGES FROM THE
MEASUREMENT TRANSFORMERS OF THE SWITCH
GEAR AND
MATCH THEM TO THE INTERNAL PROCESSING LEVEL OF THE
UNIT PHASE VOLTAGE INPUTS MAY BE CONNECTED PHA
SE
EARTH OR PHASE PHASE !PART FROM GALVANIC
AND LOW
CAPACITANCE ISOLATION PROVIDED BY THE IN
PUT TRANSFORMERS FILTERS ARE PROVIDED FOR THE SUP
PRESSION OF INTERFERENCE 4HE FILTERS HAVE BEEN OPTI
MIZED WITH REGARD TO BANDWIDTH AND PROCESSING
SPEED TO SUIT THE MEASURED VALUE PROCESSING 4HE
MATCHED ANALOG VALUES ARE THEN PASSED TO THE ANA
LOG INPUT SECTION !%
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&IGURE  (ARDWARE STRUCTURE OF PROTECTION CONTROL AND SUPERVISION DEVICE 3* EXAMPLE
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