iv
I.L. 40-386.3
LIST OF FIGURES
PAGE
SECTION 1 REL 301/302 RELAY ASSEMBLY IN FT-42 CASE (PHOTO)....................1-1
REL 301/302 LAYOUT (VERTICAL)(SHEET 1 OF 2) .......................1-10
REL 301/302 LAYOUT (HORIZONTAL)(SHEET 2 OF 2......................1-11
REL 301/302 OUTER CHASSIS (PHOTO)...............................1-12
REL 301/302 INNER CHASSIS (PHOTO) ...............................1-13
REL 301/302 RELAY PROGRAM FUNCTIONS ............................ 1-14
SECTION 2 REL 301/302 CHARACTERISTICS /R-X DIAGRAM ........................2-23
MHO CHARACTERISTIC FOR PHASE-GROUND FAULTS.......................2-24
MHO CHARACTERISTICS FOR THREE-PHASE FAULTS
(NO LOAD FLOW)..............................................2-25
MHO CHARACTERISTICS FOR PHASE-TO-PHASE AND
TWO PHASE-TO-GROUND FAULTS (NO LOAD FLOW)........................2-25
LOGIC DRAWING SYMBOLS ........................................2-26
REL 301/302 ZONE-1TRIP LOGIC.................................. 2-27
REL 301/302 ZONE-2TRIP LOGIC.................................. 2-27
REL 301/302 ZONE-3TRIP LOGIC.................................. 2-28
REL 301/302 ZONE-1EXTENSION SCHEME ........................... 2-28
INVERSE TIME OVERCURRENT GROUND BACKUP LOGIC .....................2-29
LOSS-OF-POTENTIAL LOGIC ........................................ 2-29
LOSS-OF-POTENTIAL LOGIC (SYSTEM DIAGRAM).......................... 2-30
LOSS OF CURRENT MONITORING LOGIC ................................2-30
OVERCURRENT SUPERVISION ....................................... 2-31
INSTANTANEOUS OVERCURRENT HIGHSET TRIP LOGIC ......................2-31
REL 301/302 CLOSE-INTO-FAULT TRIP (CIFT) LOGIC ....................2-32
REL 301/302 UNEQUAL-POLE-CLOSING LOAD PICKUP TRIP LOGIC ............ 2-32
LOAD LOSS ACCELERATED TRIP LOGIC ................................2-33
OUT-OF-STEP BLOCK LOGIC ....................................... 2-33
OUT-OF-STEP BLOCK LOGIC (BLINDER CHARACTERISTICS)...................2-33
RECLOSING INITIATION LOGIC....................................... 2-34
POTT/UNBLOCKING PILOT RELAY ................................... 2-34
POTT/UNBLOCKING PILOT TRIP LOGIC ................................ 2-35
CARRIER KEYING/RECEIVING LOGIC IN POTT/UNBLOCKING SCHEMES .......... 2-35
PUTT SCHEME ................................................ 2-36
BLOCKING SYSTEM LOGIC .........................................2-36
PLTG SUPPLEMENTED BY FDOG .................................... 2-37
REVERSED POWER ON POTT/UNBLOCKING SCHEMES...................... 2-37
UNEQUAL POLE CLOSING ON FAULT ..................................2-38
ADDITIONAL LOGIC FOR POTT/UNBLOCKING SCHEMES
ON 3-TERMINAL LINE APPLICATION ..................................2-38
ADDITIONAL LOGIC FOR PUTT SCHEME ON 3-TERMINAL
LINE APPLICATION ............................................. 2-39
WEAKFEED APPLICATION ..........................................2-39
REVERSIBLE ZONE-3PHASE AND GROUND (REVERSE BLOCK LOGIC)...........2-40
CO-2 CURVE CHARACTERISTICS.....................................2-41
CO-5 CURVE CHARACTERISTICS.....................................2-42
CO-6 CURVE CHARACTERISTICS.....................................2-43
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