Date Code 20010307
Loss-of-Potential, Load Encroachment, and Directional Element Logic
4-31
SEL-351-0, -1, -2, -3, -4 Instruction Manual
DUHGHDVVHUWHGWKHQIDFWRUNLVLJQRUHGDVDORJLFHQDEOHIRUWKH4*(LQWHUQDOHQDEOH,I
QHLWKHUWKH]HURVHTXHQFHYROWDJHSRODUL]HGQRUWKHFKDQQHO,1FXUUHQWSRODUL]HGGLUHFWLRQDO
HOHPHQWVDUHRSHUDEOHOHVVUHVWULFWLRQVLHIDFWRUNDUHSXWRQWKHRSHUDWLRQRIWKHQHJDWLYH
VHTXHQFHYROWDJHSRODUL]HGGLUHFWLRQDOHOHPHQW
k2 Set Automatically
,IHQDEOHVHWWLQJ( $872VHWWLQJNLVVHWDXWRPDWLFDOO\DW
N
)RUVHWWLQJN WKHQHJDWLYHVHTXHQFHFXUUHQW,
PDJQLWXGHKDVWREHJUHDWHUWKDQRIWKH
]HURVHTXHQFHFXUUHQW,
PDJQLWXGHLQRUGHUIRUWKHQHJDWLYHVHTXHQFHYROWDJHSRODUL]HG
GLUHFWLRQDOHOHPHQWVWREHHQDEOHG
(
)
,
,
>
$JDLQWKLVSUHVXPHVDWOHDVWRQHRIWKH
LQWHUQDOHQDEOHV9(RU,(LVDVVHUWHG
50GFP—Forward Directional Residual Ground Current Pickup
50GRP—Reverse Directional Residual Ground Current Pickup
6HWWLQJ5DQJH
±$VHFRQGDU\$QRPLQDOSKDVHFXUUHQWLQSXWV,$,%,&
±$VHFRQGDU\$QRPLQDOSKDVHFXUUHQWLQSXWV,$,%,&
,ISUHFHGLQJVHWWLQJ25'(5GRHVQRWFRQWDLQ9RU,QR]HURVHTXHQFHYROWDJHSRODUL]HGRU
FKDQQHO,1FXUUHQWSRODUL]HGGLUHFWLRQDOHOHPHQWVDUHHQDEOHGWKHQVHWWLQJV*)3DQG*53
DUHQRWPDGHRUGLVSOD\HG
7KH*)3VHWWLQJ,
FXUUHQWYDOXHLVWKHSLFNXSIRUWKHIRUZDUGIDXOWGHWHFWRU*)RIWKH
]HURVHTXHQFHYROWDJHSRODUL]HGDQGFKDQQHO,1FXUUHQWSRODUL]HGGLUHFWLRQDOHOHPHQWVVHH
)LJXUH,GHDOO\WKHVHWWLQJLVDERYHQRUPDOORDGXQEDODQFHDQGEHORZWKHORZHVWH[SHFWHG
]HURVHTXHQFHFXUUHQWPDJQLWXGHIRUXQEDODQFHGIRUZDUGIDXOWV
7KH*53VHWWLQJ,
FXUUHQWYDOXHLVWKHSLFNXSIRUWKHUHYHUVHIDXOWGHWHFWRU*5RIWKH
]HURVHTXHQFHYROWDJHSRODUL]HGDQGFKDQQHO,1FXUUHQWSRODUL]HGGLUHFWLRQDOHOHPHQWVVHH
)LJXUH,GHDOO\WKHVHWWLQJLVDERYHQRUPDOORDGXQEDODQFHDQGEHORZWKHORZHVWH[SHFWHG
]HURVHTXHQFHFXUUHQWPDJQLWXGHIRUXQEDODQFHGUHYHUVHIDXOWV
50GFP and 50GRP Set Automatically
,IHQDEOHVHWWLQJ( $872VHWWLQJV*)3DQG*53DUHVHWDXWRPDWLFDOO\DW
*)3 $VHFRQGDU\$QRPLQDOSKDVHFXUUHQWLQSXWV,$,%,&
*53 $VHFRQGDU\$QRPLQDOSKDVHFXUUHQWLQSXWV,$,%,&
*)3 $VHFRQGDU\$QRPLQDOSKDVHFXUUHQWLQSXWV,$,%,&
*53 $VHFRQGDU\$QRPLQDOSKDVHFXUUHQWLQSXWV,$,%,&
