/PERATING INSTRUCTIONS
3$
6
# ' #
3WITCHING ON OF A PARTICULAR FUNCTION CAN BE GENERAL
LY PERFORMED IN TWO DIFFERENT WAYS 4HE SETTING AD
DRESSES CONCERNED ARE SHOWN IN THE RESPECTIVE SEC
TIONS
",/#+ 42)0 2%,
4HE PROTECTION FUNCTION IS OP
ERATIVE AND OUTPUTS ANNUNCIATIONS (OWEVER THE
TRIP COMMAND IS BLOCKED AND IT IS NOT TRANSMITTED
TO ANY TRIP RELAY EVEN WHEN ASSIGNED
0ROTECTION FUNCTION
/.
4HE PROTECTION FUNCTION IS
OPERATIVE AND OUTPUTS ANNUNCIATIONS 4HE TRIP
COMMAND ACTIVATES THE TRIP RELAYS WHICH HAVE
BEEN MARSHALLED TO THE PROTECTION FUNCTION AC
CORDING TO 3ECTION )F THE PROTECTION COM
MAND IS NOT MARSHALLED TO ANY TRIP RELAY TRIPPING
DOES NOT OCCUR
&IGURE SHOWS A COMMISSIONING SCHEME FOR A LINE
WITH TWO TERMINALS 4HE INDIVIDUAL STEPS ARE EX
PLAINED IN THE FOLLOWING SECTIONS &OR THREETERMINAL
LINES EACH OF THE THREE CONNECTIONS MUST BE
CHECKED ACCORDING TO THE CHECKING INSTRUCTIONS
-EASURING AND SETTING OF THE PI
LOT WIRE CAPACITANCE
)F THE PILOT WIRE CAPACITANCES EXCEED APPROXIMATELY
¿
& CORRESPONDING TO APPROXIMATELY KM OR AP
PROXIMATELY MILES FOR USUAL PROTECTION CABLE
THESE CAPACITANCES MUST BE COMPENSATED AS THEY
PRODUCE AN ADDITIONAL DIFFERENTIAL CURRENT -EASUR
ING OF THE CAPACITANCES IS NOT RECOMMENDED FOR
SHORTER LENGTHS SINCE THE RESULT BECOMES INACCURATE
FOR SMALLER CAPACITANCE VALUES
4HE CAPACITANCES OF THE PILOT WIRES CAN BE CALCU
LATED FROM THE CABLE CHARACTERISTICS OR EVEN BE MEA
SURED BY THE RELAY ITSELF
4HE PILOT WIRE PAIR MUST BE CONNECTED TO THE RELAY
WHICH SHOULD CARRY OUT MEASUREMENT AT THE OPPO
SITE END THE PILOTS MUST BE ISOLATED
-EASUREMENT REQUIRES A CURRENT OF AT LEAST OF
THE RATED RELAY CURRENT )T CAN BE INJECTED AS A SEC
ONDARY CURRENT INTO THE SUMMATION TRANSFORMER
7HEN ASSESSING THE CURRENT MAGNITUDE IT MUST BE
CONSIDERED THAT THE CURRENT WHICH IS EVALUATED BY
THE RELAY DEPENDS ON THE CONNECTION MODE OF THE IN
PUT WINDINGS OF THE SUMMATION TRANSFORMER 4HE CUR
RENT MUST BE KEPT CONSTANT DURING MEASUREMENT
)NITIATION OF THE TEST IS MADE VIA OPERATOR KEYBOARD OR
PERSONAL COMPUTER )T CAN BE MADE FROM ANY LINE
END 4ESTS ARE LISTED FROM ADDRESS THE COM
MISSIONING MEASUREMENTS IN ADDRESS BLOCK 4HIS
IS REACHED
DIRECTLY WITH KEY
$!
FOLLOWED BY ADDRESS NUMBER
AND FINALLY OPERATION OF THE ENTER
KEY
%
OR
BY PAGING THROUGH THE BLOCKS WITH
Å
OR
Ç
UNTIL AD
DRESS IS REACHED
4 % 3 4 3
#OMMENCEMENT OF TEST BLOCKS
# / - - ) 3 3 ) / .
4 % 3 4
"LOCK #OMMISSIONING TESTS
Summary of Contents for 7SD502
Page 148: ... PPENDIX 3 6 PPENDIX ENERAL DIAGRAMS ONNECTION DIAGRAMS 4ABLES ...
Page 176: ... 3 6 ...
