Schweitzer Engineering Laboratories SEL-351S, Instruction Manual

Page: 580 / 636

F-4 Setting Negative-Sequence Overcurrent Elements Date Code 20010112
SEL-351S Instruction Manual
,
)
0D[LPXPORDGFXUUHQWWKURXJKIHHGHUUHOD\ $
,
5
0D[LPXPORDGFXUUHQWWKURXJKOLQHUHFORVHU $
) )HHGHUUHOD\SKDVHWLPHRYHUFXUUHQWHOHPHQW
4) )HHGHUUHOD\QHJDWLYHVHTXHQFHWLPHRYHUFXUUHQWHOHPHQW
5 /LQHUHFORVHUSKDVHWLPHRYHUFXUUHQWHOHPHQWSKDVH³VORZFXUYH´
Traditional Phase Coordination
)LJXUH)7UDGLWLRQDO3KDVH&RRUGLQDWLRQ
)SLFNXS $DERYHPD[IHHGHUORDG,
)
5SLFNXS $DERYHPD[OLQHUHFORVHUORDG,
5
)LJXUH)VKRZVWUDGLWLRQDOSKDVHRYHUFXUUHQWHOHPHQWFRRUGLQDWLRQEHWZHHQWKHIHHGHUUHOD\DQG
OLQHUHFORVHUSKDVHRYHUFXUUHQWHOHPHQWV3KDVHRYHUFXUUHQWHOHPHQWVPXVWDFFRPPRGDWHORDG
DQGFROGORDGSLFNXSFXUUHQW7KH$PD[LPXPIHHGHUORDGFXUUHQWOLPLWVWKHVHQVLWLYLW\RI
WKHIHHGHUSKDVHRYHUFXUUHQWHOHPHQW)WRDSLFNXSRI$7KHIHHGHUUHOD\FDQQRWEDFNXS
WKHOLQHUHFORVHUIRUSKDVHIDXOWVEHORZ$
Apply the Feeder Relay Negative-Sequence Overcurrent Element (Guidelines 1 to 3)
$SSO\LQJQHJDWLYHVHTXHQFHRYHUFXUUHQWHOHPHQWFRRUGLQDWLRQ*XLGHOLQHVWRUHVXOWVLQWKH
IHHGHUUHOD\³HTXLYDOHQW´SKDVHRYHUFXUUHQWHOHPHQW(3LQ)LJXUH)&XUYHIRU)LV
VKRZQIRUFRPSDULVRQRQO\