/PERATING INSTRUCTIONS
3$
6
# ' #
4ESTING THE BACKUP OVERCURRENT TIME PROTECTION
&OR TESTING THE BACKUP OVERCURRENT TIME PROTECTION
ADDRESS "!#+ 50 /# MUST BE SWITCHED TO
%8)34
!DDITIONALLY THIS FUNCTION MUST BE SWITCHED
EFFECTIVE IE ADDRESS "!#+ 50 /#
/.
OR
",/#+ 42)0 2%,
THE LATTER MEANS THAT NO TRIP COM
MAND IS GIVEN TO ANY TRIP RELAY
4ESTING THE HIGHSET OVERCURRENT STAGE
)
4ESTING CAN BE PERFORMED WITH SINGLEPHASE TWO
PHASE OR THREEPHASE TEST CURRENT 7HEN ASSESSING
THE CURRENTS IT MUST BE CONSIDERED THAT THE CURRENT
WHICH IS EVALUATED BY THE RELAY DEPENDS ON THE CON
NECTION MODE OF THE INPUT WINDINGS OF THE SUMMA
TION TRANSFORMER AS WELL AS ON THE SETTING PARAMETERS
AND 4HE SAME FACTORS ARE VALID AS FOR
TESTING THE DIFFERENTIAL PROTECTION REFER TO 3ECTION
4ABLE AND THE ASSIGNED FORMULAE
#AUTION
4EST CURRENTS LARGER THAN TIMES )
.
MAY
OVERLOAD AND DAMAGE THE RELAY IF APPLIED
CONTINUOUSLY REFER TO 3ECTION FOR
OVERLOAD CAPABILITY /BSERVE A COOLING
DOWN PERIOD
4HE LIMITS OF THE THERMAL CAPABILITY MUST BE OBSERVED
FOR THE INPUT WINDINGS OF THE SUMMATION TRANSFORMER
AS WELL AS FOR ITS OUTPUT CURRENT 2EFER ALSO TO 3ECTION
&OR TESTING THE ) STAGES THEREFORE MEASUREMENT
SHALL BE PERFORMED DYNAMICALLY )T SHOULD BE STATED
THAT THE RELAY PICKS UP AT TIMES SETTING VALUE AND
DOES NOT AT TIMES SETTING VALUE
7HEN THE TEST CURRENT IS INJECTED THE PICKUP INDICA
TION APPEARS ,%$ AT DELIVERY AND ANNUNCIATION
"ACKUP )
!FTER EXPIRY OF THE TIME DELAY TRIP
SIGNAL IS GIVEN ,%$ AT DELIVERY AND ANNUNCIATION
"ACK 'EN4RIP
)F THE PROTECTION IS SWITCHED
/.
THEN THE ASSIGNED TRIP CONTACTS CLOSE
)T MUST BE NOTED THAT THE SET TIMES ARE PURE DELAY
TIMES OPERATING TIMES OF THE MEASUREMENT FUNC
TIONS ARE NOT INCLUDED
4ESTING THE DEFINITE TIME OVERCURRENT
STAGE )
&OR THIS TEST THE
$%&).)4% 4)-%
MODE MUST BE SE
LECTED IN ADDRESSES
4HE CURRENT FACTORS ARE TO BE CONSIDERED
7HEN THE SET VALUE FOR ) ADDRESS IS EXCEED
ED THE PICKUP INDICATION
"ACKUP ))P
AP
PEARS ,%$ AT DELIVERY
!FTER EXPIRY OF THE TIME DELAY ADDRESS 4 )
TRIP SIGNAL IS GIVEN ,%$ AT DELIVERY AND ANNUNCI
ATION
"ACK
'EN4RIP
)F THE PROTECTION IS
SWITCHED
/.
THEN THE ASSIGNED TRIP CONTACTS CLOSE
)T MUST BE NOTED THAT THE SET TIMES ARE PURE DELAY
TIMES OPERATING TIMES OF THE MEASUREMENT FUNC
TIONS ARE NOT INCLUDED
4ESTING THE INVERSE TIME OVERCURRENT
STAGE )
P
&OR THESE TESTS ONE OF THE
).6%23%
TIME MODES
MUST BE SELECTED IN ADDRESSES
4HE CURRENT FACTORS ARE TO BE CONSIDERED
#AUTION
4EST CURRENTS LARGER THAN TIMES )
.
MAY
OVERLOAD AND DAMAGE THE RELAY IF APPLIED
CONTINUOUSLY REFER TO 3ECTION FOR
OVERLOAD CAPABILITY /BSERVE A COOLING
DOWN PERIOD
4HE LIMITS OF THE THERMAL CAPABILITY MUST BE OBSERVED
FOR THE INPUT WINDINGS OF THE SUMMATION TRANSFORMER
AS WELL AS FOR ITS OUTPUT CURRENT 2EFER ALSO TO 3ECTION
7HEN THE TEST CURRENT IS INCREASED ABOVE TIMES
THE SET VALUE )P ADDRESS )P PICKUP INDICATION
APPEARS
"ACKUP ))P
,%$ AT DELIVERY
4HE TIME DELAY DEPENDS ON WHICH CHARACTERISTIC HAS
BEEN SELECTED IN ADDRESS AND THE SET TIME MUL
TIPLIER IN ADDRESS 4HE EXPECTED TIME DELAYS
CAN BE CALCULATED FROM THE FORMULAE GIVEN IN THE
4ECHNICAL DATA OR READ FROM THE CHARACTERISTIC CURVES
IN &IGURE CONSIDER CURRENT FACTORS
Summary of Contents for 7SD502
Page 148: ... PPENDIX 3 6 PPENDIX ENERAL DIAGRAMS ONNECTION DIAGRAMS 4ABLES ...
Page 176: ... 3 6 ...
