5-14
Applications
Date Code 20010215
SEL-321-2 Instruction Manual
Negative-Sequence Overcurrent Settings
Negative-Sequence Time-Overcurrent Settings
7KHQHJDWLYHVHTXHQFHWLPHRYHUFXUUHQWHOHPHQWSURYLGHVFXUUHQWGHSHQGHQWWLPHGHOD\HG
FOHDUDQFHRIIDXOWVDORQJWKHSURWHFWHGOLQHDQGSURYLGHVEDFNXSSURWHFWLRQIRUUHPRWHWHUPLQDOV
%HFDXVHWKHPHDVXUHRIQHJDWLYHVHTXHQFHFXUUHQWYDULHVZLWKV\VWHPVZLWFKLQJFRQILJXUDWLRQ
IDXOWORFDWLRQDQGIDXOWUHVLVWDQFHDFRPSOHWHIDXOWVWXG\LVQHFHVVDU\WRGHWHUPLQHWKHPLQLPXP
SLFNXSVHWWLQJDSSURSULDWHWLPHGLDODQGFXUYHFKDUDFWHULVWLF:KHQWKHHOHPHQWLVGLUHFWLRQDOO\
FRQWUROOHGFRQVLGHURQO\IDXOWVLQIURQWRIWKHOLQHWHUPLQDOIRUFRRUGLQDWLQJSXUSRVHV
7KHQHJDWLYHVHTXHQFHRYHUFXUUHQWHOHPHQWFDQSURYLGHEDFNXSIRUSKDVHWRSKDVHRUSKDVHWR
JURXQGIDXOWV)RUWKLVH[DPSOHWKHQHJDWLYHVHTXHQFHHOHPHQWSURYLGHVEDFNXSIRUSKDVHWR
SKDVHIDXOWV3KDVHWRJURXQGIDXOWVQHHGRQO\EHFRQVLGHUHGIRUFRRUGLQDWLRQSXUSRVHV
)RUWKHUHOD\DW%UHDNHUDSKDVHWRSKDVHIDXOWDW%XV&ZLWK/LQHRURSHQGLFWDWHVWKH
VHQVLWLYLW\UHTXLUHGIRUWKHQHJDWLYHVHTXHQFHWLPHRYHUFXUUHQWSLFNXS7KHQHJDWLYHVHTXHQFH
,
FXUUHQWPDJQLWXGHIRUWKLVIDXOWLV$SULPDU\7RDOORZIRUIDXOWUHVLVWDQFHDYDOXHRI
RI$LVVHOHFWHGDVWKHQHJDWLYHVHTXHQFHWLPHRYHUFXUUHQWHOHPHQWSLFNXS7KHSLFNXS
43WLPHGLDO47'DQGFXUYHIDPLO\4&VHOHFWLRQVDUHDVVXPHGWRFRRUGLQDWHZLWK
WKHUHPDLQLQJQHJDWLYHVHTXHQFHDQGUHVLGXDOWLPHRYHUFXUUHQWHOHPHQWVRIWKHH[DPSOHV\VWHP
Instantaneous/Definite-Time Negative-Sequence Setting
7KHQHJDWLYHVHTXHQFHLQVWDQWDQHRXVGHILQLWHWLPHRYHUFXUUHQWHOHPHQWVDUHQRWUHTXLUHGIRUWKLV
DSSOLFDWLRQ7KHQHJDWLYHVHTXHQFHRYHUFXUUHQWHOHPHQWVDUHGLVDEOHGE\VHWWLQJ(4 1
&DOFXODWLRQV &75
43VHFRQGDU\DPSV
$
SULPDU\
$
=
VHFRQGDU\
(4 <
43
4& 8
47'
456 1
47& 4)
(4 1
5HOD\(OHPHQWVDQG2WKHU6HWWLQJV$IIHFWHG
5HOD\HOHPHQWV47DQG43GHSHQGRQWKH4347'4&DQG47&VHWWLQJV
444444444747DQG47HOHPHQWV
Summary of Contents for SEL-321-2
Page 4: ......
Page 8: ......
Page 10: ......
Page 18: ......
Page 71: ...Date Code 20010215 Specifications 2 49 SEL 321 2 Instruction Manual LJXUH RJLF 6 PERO HJHQG ...
Page 87: ...Date Code 20010215 Specifications 2 65 SEL 321 2 Instruction Manual LJXUH 9ROWDJH OHPHQW RJLF ...
Page 102: ......
Page 156: ......
Page 252: ......
Page 253: ...SEL DIRECTION AND POLARITY CHECK FORM ...
Page 254: ......
Page 255: ...SEL DIRECTION AND POLARITY CHECK FORM ...
Page 256: ......
Page 260: ......
Page 326: ......
Page 328: ......
Page 332: ......
Page 336: ......