Date Code 20010307
Setting Negative-Sequence Overcurrent Elements
F-3
SEL-351-0, -1, -2, -3, -4 Instruction Manual
HOHPHQWODEHOVLQWKHH[DPSOHDUHQRWWKHVDPHDVWKHODEHOVRIWKHFRUUHVSRQGLQJ6(/
5HOD\
RYHUFXUUHQWHOHPHQWV
Coordination Guidelines
6WDUWZLWKWKHIXUWKHVWGRZQVWUHDPQHJDWLYHVHTXHQFHRYHUFXUUHQWHOHPHQWHJGLVWULEXWLRQ
IHHGHUUHOD\LQDVXEVWDWLRQ
,GHQWLI\WKHSKDVHRYHUFXUUHQWGHYLFHHJOLQHUHFORVHUIXVHGRZQVWUHDPIURPWKHQHJDWLYH
VHTXHQFHRYHUFXUUHQWHOHPHQWWKDWLVRIJUHDWHVWFRQFHUQIRUFRRUGLQDWLRQ7KLVLVXVXDOO\WKH
SKDVHRYHUFXUUHQWGHYLFHZLWKWKHORQJHVWFOHDULQJWLPH
&RQVLGHUWKHQHJDWLYHVHTXHQFHRYHUFXUUHQWHOHPHQWDVDQ³HTXLYDOHQW´SKDVHRYHUFXUUHQW
HOHPHQW'HULYHSLFNXSWLPHGLDOOHYHUFXUYHW\SHRUWLPHGHOD\VHWWLQJVIRUWKLV
³HTXLYDOHQW´HOHPHQWWRFRRUGLQDWHZLWKWKHGRZQVWUHDPSKDVHRYHUFXUUHQWGHYLFHDVDQ\
SKDVHFRRUGLQDWLRQZRXOGEHSHUIRUPHG/RDGFRQVLGHUDWLRQVFDQEHGLVUHJDUGHGZKHQ
GHULYLQJWKH³HTXLYDOHQW´SKDVHRYHUFXUUHQWHOHPHQWVHWWLQJV
0XOWLSO\WKH³HTXLYDOHQW´SKDVHRYHUFXUUHQWHOHPHQWSLFNXSVHWWLQJE\ WRFRQYHUWLWWRWKH
QHJDWLYHVHTXHQFHRYHUFXUUHQWHOHPHQWSLFNXSVHWWLQJLQWHUPVRI,
FXUUHQW
1HJDWLYHVHTXHQFH
RYHUFXUUHQW
HOHPHQWSLFNXS
¼
=
³HTXLYDOHQW´SKDVHRYHUFXUUHQWHOHPHQW
SLFNXS
$Q\WLPHGLDOOHYHUFXUYHW\SHRUWLPHGHOD\FDOFXODWHGIRUWKH³HTXLYDOHQW´SKDVH
RYHUFXUUHQWHOHPHQWLVDOVRXVHGIRUWKHQHJDWLYHVHTXHQFHRYHUFXUUHQWHOHPHQWZLWKQR
FRQYHUVLRQIDFWRUDSSOLHG
6HWWKHQH[WXSVWUHDPQHJDWLYHVHTXHQFHRYHUFXUUHQWHOHPHQWWRFRRUGLQDWHZLWKWKHILUVW
GRZQVWUHDPQHJDWLYHVHTXHQFHRYHUFXUUHQWHOHPHQWDQGVRRQ$JDLQFRRUGLQDWLRQLVQRW
LQIOXHQFHGE\ORDGFRQVLGHUDWLRQV
Coordination Example
,Q)LJXUH)WKHSKDVHDQGQHJDWLYHVHTXHQFHRYHUFXUUHQWHOHPHQWVRIWKHIHHGHUUHOD\)DQG
4)UHVSHFWLYHO\PXVWFRRUGLQDWHZLWKWKHSKDVHRYHUFXUUHQWHOHPHQWRIWKHOLQHUHFORVHU
5
)LJXUH)'LVWULEXWLRQ)HHGHU3URWHFWLYH'HYLFHV