Schweitzer Engineering Laboratories SEL-351S, Instruction Manual

Page: 105 / 636

Date Code 20010112 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-35
SEL-351S Instruction Manual
,IWKHYROWDJHVDUHQRWVWDWLFYROWDJHVVOLSSLQJZLWKUHVSHFWWRRQHDQRWKHUWKHWZRV\QFKURQLVP
FKHFNHOHPHQWVRSHUDWHDVVKRZQLQWKHERWWRPRI)LJXUH7KHDQJOHGLIIHUHQFHLV
FRPSHQVDWHGE\EUHDNHUFORVHWLPHDQGWKHEUHDNHULVLGHDOO\FORVHGDWD]HURGHJUHHSKDVHDQJOH
GLIIHUHQFHWRPLQLPL]HV\VWHPVKRFN
7KHVHV\QFKURQLVPFKHFNHOHPHQWVDUHH[SODLQHGLQGHWDLOLQWKHIROORZLQJWH[W
Voltage Input VS Connected Phase-to-Phase or Beyond Delta-Wye Transformer
6RPHWLPHVV\QFKURQLVPFKHFNYROWDJH9
6
FDQQRWEHLQSKDVHZLWKYROWDJH9
$
9
%
RU9
&
7KLV
KDSSHQVLQDSSOLFDWLRQVZKHUHYROWDJHLQSXW9616LVFRQQHFWHGSKDVHWRSKDVHRUEH\RQGD
GHOWDZ\HWUDQVIRUPHU)RUVXFKDSSOLFDWLRQVUHTXLULQJ9
6
WREHDWDFRQVWDQWSKDVHDQJOH
GLIIHUHQFHIURPDQ\RIWKHSRVVLEOHV\QFKURQL]LQJYROWDJHV9
$
9
%
RU9
&
DQDQJOHVHWWLQJLV
PDGHZLWKWKH6<1&3VHWWLQJVHH7DEOHDQGWKH6<1&3VHWWLQJGLVFXVVLRQWKDWIROORZV
Synchronism Check Elements Settings
7DEOH6\QFKURQLVP&KHFN(OHPHQWV6HWWLQJVDQG6HWWLQJV5DQJHV
6HWWLQJ 'HILQLWLRQ 5DQJH
9/2 ORZYROWDJHWKUHVKROGIRU³KHDOWK\YROWDJH´
ZLQGRZ
±9VHFRQGDU\
9+, KLJKYROWDJHWKUHVKROGIRU³KHDOWK\YROWDJH´
ZLQGRZ
±9VHFRQGDU\
6) PD[LPXPVOLSIUHTXHQF\ ±+]
$1* V\QFKURQLVPFKHFNHOHPHQW$PD[LPXP
DQJOH
ž±ž
$1* V\QFKURQLVPFKHFNHOHPHQW$PD[LPXP
DQJOH
ž±ž
6<1&3 V\QFKURQL]LQJSKDVH 9$9%RU9&
RU
WKHQXPEHURIGHJUHHVWKDWV\QFKURQLVPFKHFN
YROWDJH9
6
FRQVWDQWO\ODJVYROWDJH9
$
• ± • LQGHJUHHVWHSV
7&/26' EUHDNHUFORVHWLPHIRUDQJOHFRPSHQVDWLRQ ±F\FOHV
%6<1&+ 6(/
2*,&
FRQWUROHTXDWLRQEORFNV\QFKURQLVP
FKHFNVHWWLQJ
5HOD\:RUGELWVUHIHUHQFHG
LQ7DEOH
Setting SYNCP
7KHDQJOHVHWWLQJFKRLFHV«RUGHJUHHVIRUVHWWLQJ6<1&3DUHUHIHUHQFHGWR
9
$
7KH\LQGLFDWHKRZPDQ\GHJUHHV9
6
FRQVWDQWO\ODJV9
$
,QDQ\V\QFKURQLVPFKHFN
DSSOLFDWLRQYROWDJHLQSXW9$1DOZD\VKDVWREHFRQQHFWHGWRGHWHUPLQHV\VWHPIUHTXHQF\RQ
RQHVLGHRIWKHFLUFXLWEUHDNHUWRGHWHUPLQHWKHVOLSEHWZHHQ9
6
DQG9
$
9
$
DOZD\VKDVWRPHHW
WKH³KHDOWK\YROWDJH´FULWHULDVH,DQG9/2±VHH)LJXUH7KXVIRUVLWXDWLRQV
ZKHUH9
6
FDQQRWEHLQSKDVHZLWK9
$
9
%
RU9
&
LWLVPRVWVWUDLJKWIRUZDUGWRKDYHWKHDQJOH