Siemens 7SD502, Instruction Manual

Page: 137 / 178

/PERATING INSTRUCTIONS 3$
6
# ' #
- % ! 3 ) )
) ) ) N
4HE MEASURED CURRENT ) AT THE THIRD LINE END IS DIS
PLAYED REFERRED TO THE RATED RELAY CURRENT SHOULD BE IN
SIGNIFICANT CONTINUE WITH THE .O KEY .
- % ! 3 ) )
4HE PHASE DISPLACEMENT ´ BETWEEN THE MEASURED CUR
RENTS AT THE LINE ENDS IS DISPLAYED SHOULD BE INDEFINITE
BECAUSE ) ‘
CONTINUE WITH THE .O KEY .
´
- % ! 3 ) )
) $ ) ) N
4HE DIFFERENTIAL CURRENT )
DIFF
IS DISPLAYED REFERRED TO THE
RATED RELAY CURRENT
4HE DIFFERENTIAL CURRENT IS IGNORED 4HIS TEST CHECKS
ONLY THE CORRECT CONNECTION OF THE PILOT WIRES OF THE
PILOTS ! " AT THE RELAY !C
)F ) ‘ ) AND ´ ‘ THE PILOT WIRES AT THE RELAY !B
ARE NOT CONNECTED TO THE ADDITIONAL CURRENT INPUT OF
THE RELAY !C 4HE POWER LINE IS SWITCHED OFF AND THE
CONNECTIONS OF THE PILOT WIRES ! " AT THE RELAY !C
MUST BE CAREFULLY CHECKED AND CORRECTED
)F ) ‘ | ) AND ´ ‘ THE CONNECTION OF THE PILOT
WIRES ! " AT THE ADDITIONAL CURRENT INPUT OF THE RELAY
!C ARE INTERCHANGED
3WITCH OFF THE LINE AND CHECK AND CORRECT THE CON
NECTIONS OF THE PILOT WIRES ! " AT THE ADDITIONAL CUR
RENT INPUT OF THE RELAY !C 2EPEAT THE CHECK
4HE SUCCESSFUL CHECK COMPLETES THE TESTS TO BE PER
FORMED AT LINE END !
!LL OF THE TESTS DESCRIBED UNTIL NOW MUST BE CARRIED
OUT ACCORDINGLY AT THE LINE END # WITH CURRENT FLOW
FROM ! TO # OR VICE VERSA )F CORRECTIONS BECOME NEC
ESSARY THESE ARE PERFORMED ONLY AT THIS LINE END #
.O CORRECTIONS MUST BE PERFORMED AT THE LINE END !
WHICH IS ALREADY CHECKED OTHERWISE A COMPLETE RE
CHECK OF ALL CONNECTIONS WOULD BECOME NECESSARY
.OTE THAT THE INDICES OF THE LINE ENDS CHANGE CYCLI
CALLY NEGATIVE IE
-EASUREMENT AT RELAY #A INSTEAD OF !B
LOCAL LINE END # INSTEAD OF ! MEASURED CURRENT )
OPPOSITE LINE END ! INSTEAD OF " MEASURED CURRENT )
OPEN LINE END " INSTEAD OF # MEASURED CURRENT )
-EASUREMENT AT RELAY #B INSTEAD OF !C
LOCAL LINE END # INSTEAD OF ! MEASURED CURRENT )
OPPOSITE LINE END " INSTEAD OF # MEASURED CURRENT )
THIRD LINE END ! INSTEAD OF " MEASURED CURRENT )
4HE CONNECTIONS AT THE RELAYS #A AND #B HAVE BEEN
VERIFIED AFTER SUCCESSFUL COMPLETION OF THESE CHECK
SERIES
4HE LAST SERIES OF CHECKS REFERS TO THE LINE END " WITH
CURRENT FLOW FROM " TO # OR VICE VERSA )F CORRECTIONS
BECOME NECESSARY THESE ARE PERFORMED ONLY AT THIS
LINE END " .O CORRECTIONS MUST BE PERFORMED AT THE
LINE ENDS ! AND # WHICH ARE ALREADY CHECKED OTHER
WISE A COMPLETE RECHECK OF ALL CONNECTIONS WOULD BE
COME NECESSARY
4HE INDEXING IN THIS CASE IS
-EASUREMENT AT RELAY "C INSTEAD OF !B
LOCAL LINE END " INSTEAD OF ! MEASURED CURRENT )
OPPOSITE LINE END # INSTEAD OF " MEASURED CURRENT )
OPEN LINE END ! INSTEAD OF # MEASURED CURRENT )
-EASUREMENT AT RELAY "A INSTEAD OF !C
LOCAL LINE END " INSTEAD OF ! MEASURED CURRENT )
OPPOSITE LINE END ! INSTEAD OF # MEASURED CURRENT )
THIRD LINE END # INSTEAD OF " MEASURED CURRENT )
4HE CONNECTIONS AT ALL RELAY HAVE BEEN VERIFIED AFTER
SUCCESSFUL COMPLETION OF THESE CHECK SERIES
&INALLY ALL CIRCUIT BREAKERS MAY BE OPENED