4-32
Loss-of-Potential, Load Encroachment, and Directional Element Logic
Date Code 20010307
SEL-351-0, -1, -2, -3, -4 Instruction Manual
a0—Positive-Sequence Current Restraint Factor, I
0
/I
1
6HWWLQJ5DQJH
±
XQLWOHVV
,ISUHFHGLQJVHWWLQJ25'(5GRHVQRWFRQWDLQ9RU,QR]HURVHTXHQFHYROWDJHSRODUL]HGRU
FKDQQHO,1FXUUHQWSRODUL]HGGLUHFWLRQDOHOHPHQWVDUHHQDEOHGWKHQVHWWLQJDLVQRWPDGHRU
GLVSOD\HG
5HIHUWR)LJXUH
7KHDIDFWRULQFUHDVHVWKHVHFXULW\RIWKH]HURVHTXHQFHYROWDJHSRODUL]HGDQGFKDQQHO,1
FXUUHQWSRODUL]HGGLUHFWLRQDOHOHPHQWV,WNHHSVWKHHOHPHQWVIURPRSHUDWLQJIRU]HURVHTXHQFH
FXUUHQWV\VWHPXQEDODQFHZKLFKFLUFXODWHVGXHWROLQHDV\PPHWULHV&7VDWXUDWLRQGXULQJWKUHH
SKDVHIDXOWVHWF
a0 Set Automatically
,IHQDEOHVHWWLQJ( $872VHWWLQJDLVVHWDXWRPDWLFDOO\DW
D
)RUVHWWLQJD WKH]HURVHTXHQFHFXUUHQW,
PDJQLWXGHKDVWREHJUHDWHUWKDQRIWKH
SRVLWLYHVHTXHQFHFXUUHQW,
PDJQLWXGHLQRUGHUIRUWKH]HURVHTXHQFHYROWDJHSRODUL]HGDQG
FKDQQHO,1FXUUHQWSRODUL]HGGLUHFWLRQDOHOHPHQWVWREHHQDEOHG
(
)
,
,
>
Z0F—Forward Directional Z0 Threshold
Z0R—Reverse Directional Z0 Threshold
6HWWLQJ5DQJH
WR VHFRQGDU\9YROWDJHLQSXWV9$9%9&$QRPLQDOSKDVH
FXUUHQWLQSXWV,$,%,&
WR VHFRQGDU\9YROWDJHLQSXWV9$9%9&$QRPLQDOSKDVH
FXUUHQWLQSXWV,$,%,&
WR VHFRQGDU\9YROWDJHLQSXWV9$9%9&$QRPLQDOSKDVH
FXUUHQWLQSXWV,$,%,&
WR VHFRQGDU\9YROWDJHLQSXWV9$9%9&$QRPLQDOSKDVH
FXUUHQWLQSXWV,$,%,&
,ISUHFHGLQJVHWWLQJ25'(5GRHVQRWFRQWDLQ9QR]HURVHTXHQFHYROWDJHSRODUL]HGGLUHFWLRQDO
HOHPHQWLVHQDEOHGWKHQVHWWLQJV=)DQG=5DUHQRWPDGHRUGLVSOD\HG
=)DQG=5DUHXVHGWRFDOFXODWHWKH)RUZDUGDQG5HYHUVH7KUHVKROGVUHVSHFWLYHO\IRUWKH
]HURVHTXHQFHYROWDJHSRODUL]HGGLUHFWLRQDOHOHPHQWVVHH)LJXUH