Siemens SIPROTEC 7SJ531 - Page 12

)NTRODUCTION3*
6
#
' #

5NDERCURRENT SUPERVISION


ALARM WHEN THE OPERATIONAL CURRENT FALLS BELOW A
SELECTABLE VALUE EG FOR MOTORS
6OLTAGE PROTECTION
TWO STAGE UNDERVOLTAGE PROTECTION WITH ADDI
TIONAL START
UP THRESHOLD
OPTIONAL CURRENT CRITERION PROVIDES ADDITIONAL RE
LEASE CONDITION
INDEPENDENT OVERVOLTAGE DETECTION
#ONTROL OF SWITCHING DEVICES
-ANUAL CLOSING AND OPENING OF SWITCHING DEVICES
VIA SEPARATE OPERATING KEYS VIA BINARY INPUTS VIA
THE SYSTEM INTERFACE EG FROM ,3! OR VIA THE OP
ERATION INTERFACE BY MEANS OF A PERSONAL COMPUT
ER AND THE COMMUNICATION PROGRAM $)'3)
Q

FEEDBACK OF THE SWITCHING STATES VIA THE SWITCHES
AUXILIARY CONTACTS
INDICATION OF THE MOMENTARY SWITCHING STATE OF ALL
SWITCHING DEVICES IN A FEEDER MIMIC DIAGRAM
5SER DEFINABLE ANNUNCIATIONS
FOUR ANNUNCIATIONS CAN BE COUPLED INTO THE RELAY
VIA BINARY INPUTS FROM EXTERNAL PROTECTION OR SU
PERVISION DEVICES AND CAN BE INCLUDED INTO THE
ANNUNCIATION PROCESSING
EACH USER DEFINED ANNUNCIATION CAN BE OPTIONALLY
ALLOCATED TO TRIP RELAYS
4RIP CIRCUIT SUPERVISION


DETECTION OF INTERRUPTIONS OR SHORT CIRCUITS IN THE
TRIP CIRCUIT DETECTION OF FAULT IN THE MECHANICAL
SYSTEM OF THE BREAKER AND CONTROL VOLTAGE FAILURE
4HE STANDARD FUNCTIONS ALSO INCLUDE
CONTINUOUS SELF MONITORING RIGHT FROM THE DC
CIRCUITS THROUGH THE CURRENT AND VOLTAGE TRANS
FORMER INPUTS TO THE TRIPPING RELAYS THUS ACHIEV
ING MAXIMUM AVAILABILITY AND A MORE CORRECTIVE
THAN PREVENTIVE MAINTENANCE STRATEGY
MEASUREMENT AND TEST ROUTINES UNDER NORMAL
LOAD CONDITIONS
MEASUREMENT OF LOAD CURRENTS AND OPERATING VOLT
AGES
MEASUREMENT OF POWER CALCULATION OF POWER FAC
TOR AND FREQUENCY
METERING OF ACTIVE AND REACTIVE ENERGY
CALCULATION OF THERMAL OVERLOAD
PHASE SEQUENCE CHECKS
ANNUNCIATION STORAGE AND TRANSMISSION OF THE LAST
EIGHT NETWORK FAULTS WITH REAL TIME CLOCK
STORAGE OF DATA OF THE LAST THREE EARTH FAULTS IN ISO
LATED OR ARC COMPENSATED SYSTEMS
SPONTANEOUS FAULT INDICATIONS IN THE FRONT DISPLAY
AFTER A SYSTEM FAULT
DATA STORAGE AND TRANSMISSION FOR FAULT RECORDS
GIVING
RAPID FAULT ANALYSIS
DETAILED FAULT RECORDS
COUNTING OF TRIPPING AND CLOSING COMMANDS
ELAPSED HOUR METER

 METERING THE OPERATING
TIME OF THE PROTECTED OBJECT UNDER LOAD
ACTIVE STATUS INDICATIONS OF THE DEVICE OR THE PLANT
CAN BE READ OFF IN THE DISPLAY STATUS INDICATIONS
COMMISSIONING AIDS SUCH AS CONNECTION VERIFICA
TION AND CIRCUIT BREAKER LIVE TEST

 ONLY FOR MODEL 3*J JJJJ JJJJ
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