Siemens siprotec 7sj602 - 4.6 Unbalanced load; negative sequence protection

0HWKRG RI RSHUDWLRQ6-
9

&       *      &   
 8QEDODQFHG ORDG  QHJDWLYH VHTXHQFH SURWHFWLRQ
7KH XQLW LV HTXLSSHG ZLWK DQ XQEDODQFHG ORDG SUR
WHFWLRQ ZKLFK LV DGYDQWDJHRXV IRU SURWHFWLRQ RI
PRWRUV SDUWLFXODUO\ WKRVH ZKLFK DUH VZLWFKHG E\
YDFXXP FRQWDFWRUV ZLWK DVVRFLDWHG IXVHV :KHQ
UXQQLQJ RQ VLQJOH SKDVH WKH PRWRUV GHYHORS VPDOO
DQG SXOVDWLQJ WRUTXHV VR WKDW ZLWK XQFKDQJHG
WRUTXH ORDG WKH PRWRU ZLOO EH TXLFNO\ WKHUPDOO\ RYHU
ORDGHG )XUWKHUPRUH WKHUPDO RYHUORDGLQJ RI WKH
PRWRU FDQ DULVH E\ XQV\PPHWULFDO V\VWHP YROWDJH
(YHQ VPDOO XQEDODQFHG V\VWHP YROWDJHV PD\ OHDG WR
ODUJH VOLS ORDG FXUUHQWV EHFDXVH RI WKH VPDOO QHJD
WLYH VHTXHQFH UHDFWDQFHV
7KH XQEDODQFHG ORDG SURWHFWLRQ GHWHFWV DGGLWLRQDO
O\ LQWHUUXSWLRQV VKRUWFLUFXLWV DQG VZRSSHG SKDVH
FRQQHFWLRQV RI WKH FXUUHQW WUDQVIRUPHU FLUFXLWV
6LQJOHSKDVH DQG WZRSKDVH VKRUWFLUFXLWV FDQ EH
GHWHFWHG HYHQ ZKHQ WKH IDXOW FXUUHQW LV WRR VPDOO WR
EH GHWHFWHG E\ WKH WLPH RYHUFXUUHQW SURWHFWLRQ
,Q WKH XQEDODQFHG ORDG SURWHFWLRQ RI WKH 6- WKH
IXQGDPHQWDO ZDYH RI WKH SKDVH FXUUHQWV LV ILOWHUHG
RXW DQG VHSDUDWHG LQWR V\PPHWULFDO FRPSRQHQWV
QHJDWLYH VHTXHQFH ,

DQG SRVLWLYH VHTXHQFH ,


7KH UDWLR ,

,
1
,
1
UDWHG UHOD\ FXUUHQW LV HYDOXDWHG
IRU XQEDODQFHG ORDG GHWHFWLRQ
7KH XQEDODQFHG ORDG SURWHFWLRQ KDV WZRVWDJH GH
VLJQ ,I WKH ILUVW DGMXVWDEOH WKUHVKROG ,

! LV UHDFKHG
WLPHU 7
,!
LV VWDUWHG WKH VHFRQG DGMXVWDEOH WKUHVK
ROG ,

!! VWDUWV WKH WLPHU 7
,!!
VHH )LJXUH 
:KHQ WKH DVVRFLDWHG WLPH KDV HODSVHG WULS FRP
PDQG LV LVVXHG
)LOWHULQJ RI WKH QHJDWLYH VHTXHQFH FXUUHQW LV SRV
VLEOH DV ORQJ DV WKH KLJKHVW RI WKH WKUHH SKDVH FXU
UHQWV LV DW OHDVW  WLPHV UDWHG FXUUHQW RI WKH UHOD\
)LJXUH  VKRZV WKH ORJLF GLDJUDP RI WKH XQEDO
DQFHGORDGSURWHFWLRQ
W
7
,!
7
,!!
,

!,

!! ,

WULS VWDJH ,

!
WULS VWDJH ,

!!
7ULS DUHD
)LJXUH  7ULS WLPH FKDUDFWHULVWLF RI WKH XQEDODQFHG ORDG SURWHFWLRQ