Date Code 20010307
Loss-of-Potential, Load Encroachment, and Directional Element Logic
4-29
SEL-351-0, -1, -2, -3, -4 Instruction Manual
Z2F and Z2R Set Automatically
,IHQDEOHVHWWLQJ( $872VHWWLQJV=)DQG=5QHJDWLYHVHTXHQFHLPSHGDQFHYDOXHVDUH
FDOFXODWHGDXWRPDWLFDOO\XVLQJWKHSRVLWLYHVHTXHQFHOLQHLPSHGDQFHPDJQLWXGHVHWWLQJ=0$*
DVIROORZV
=) =0$*
VHFRQGDU\
=5 =0$*]
VHFRQGDU\³]´OLVWHGLQWDEOHEHORZ
,IHQDEOHVHWWLQJ( <VHWWLQJV=)DQG=5QHJDWLYHVHTXHQFHLPSHGDQFHYDOXHVDUH
FDOFXODWHGE\WKHXVHUDQGHQWHUHGE\WKHXVHUEXWVHWWLQJ=5PXVWEHJUHDWHULQYDOXHWKDQ
VHWWLQJ=)E\YDOXH³]´
5HOD\&RQILJXUDWLRQ
] VHFRQGDU\
$QRPLQDOFXUUHQW9YROWDJHLQSXWV
$QRPLQDOFXUUHQW9YROWDJHLQSXWV
$QRPLQDOFXUUHQW9YROWDJHLQSXWV
$QRPLQDOFXUUHQW9YROWDJHLQSXWV
50QFP—Forward Directional Negative-Sequence Current Pickup
50QRP—Reverse Directional Negative-Sequence Current Pickup
6HWWLQJ5DQJH
±$VHFRQGDU\$QRPLQDOSKDVHFXUUHQWLQSXWV,$,%,&
±$VHFRQGDU\$QRPLQDOSKDVHFXUUHQWLQSXWV,$,%,&
7KH4)3VHWWLQJ,
FXUUHQWYDOXHLVWKHSLFNXSIRUWKHIRUZDUGIDXOWGHWHFWRU4)RIWKH
QHJDWLYHVHTXHQFHYROWDJHSRODUL]HGGLUHFWLRQDOHOHPHQWVVHH)LJXUH,GHDOO\WKHVHWWLQJLV
DERYHQRUPDOORDGXQEDODQFHDQGEHORZWKHORZHVWH[SHFWHGQHJDWLYHVHTXHQFHFXUUHQW
PDJQLWXGHIRUXQEDODQFHGIRUZDUGIDXOWV
7KH453VHWWLQJ,
FXUUHQWYDOXHLVWKHSLFNXSIRUWKHUHYHUVHIDXOWGHWHFWRU45RIWKH
QHJDWLYHVHTXHQFHYROWDJHSRODUL]HGGLUHFWLRQDOHOHPHQWVVHH)LJXUH,GHDOO\WKHVHWWLQJLV
DERYHQRUPDOORDGXQEDODQFHDQGEHORZWKHORZHVWH[SHFWHGQHJDWLYHVHTXHQFHFXUUHQW
PDJQLWXGHIRUXQEDODQFHGUHYHUVHIDXOWV
50QFP and 50QRP Set Automatically
,IHQDEOHVHWWLQJ( $872VHWWLQJV4)3DQG453DUHVHWDXWRPDWLFDOO\DW
4)3 $VHFRQGDU\$QRPLQDOSKDVHFXUUHQWLQSXWV,$,%,&
453 $VHFRQGDU\$QRPLQDOSKDVHFXUUHQWLQSXWV,$,%,&
4)3 $VHFRQGDU\$QRPLQDOSKDVHFXUUHQWLQSXWV,$,%,&
453 $VHFRQGDU\$QRPLQDOSKDVHFXUUHQWLQSXWV,$,%,&
