Download Print this page

Siemens SIPROTEC 7SA511 Instruction Manual page 56

Numerical distance protection relay

Advertisement

6$
9

7ULSSLQJ ORJLF
:KHQ WKH UHOD\ KDV GHWHFWHG D IDXOW VHH 6HFWLRQ
  WKH GHOD\ WLPHV DUH VWDUWHG 7KH LPSHGDQFH
RI WKH VHOHFWHG IDXOW ORRS DFFRUGLQJ WR 6HFWLRQ 
DUH FRPSDUHG ZLWK WKH WKUHVKROG RI WKH VHW ]RQHV
7ULSSLQJ RFFXUV ZKHQ WKH LPSHGDQFH LV ZLWKLQ D
]RQH ZKRVH FRUUHVSRQGLQJ WLPH VWDJH KDV H[SLUHG
DQG WKH IDXOW GLUHFWLRQ FRPSOLHV ZLWK WKH GLUHFWLRQ DV
VHW IRU WKDW ]RQH )RU ]RQH = DQG =% WKH GHOD\
WLPH FDQ HTXDO ]HUR LH WULSSLQJ RFFXUV DV VRRQ DV LW
KDV EHHQ FRQILUPHG WKDW WKH IDXOW OLHV ZLWKLQ WKH
]RQH $Q DXWRPDWLF UHSHWLWLRQ RI WKH PHDVXUHPHQW
EHFRPHV HIIHFWLYH QHDU WR WKH EDODQFHG SRLQW LQ RU
GHU WR SUHYHQW DQ\ WUDQVLHQW RYHUUHDFK 7KLV FDQ OHDG
WR D VOLJKW LQFUHDVH LQ WKH UHDFWLRQ WLPH
,Q VWDJHV = DQG =% DQG LI GHVLUHG LQ VWDJH =
VLQJOHSKDVH IDXOWV FDQ EH WULSSHG VLQJOHSROH 7KLV
LV DOZD\V PHDQLQJIXO ZKHQ WKH QHWZRUN SUDFWLFH UH
TXLUHV VLQJOHSROH DXWRUHFORVXUH 0XOWLSKDVH IDXOWV
ZLOO DOZD\V UHVXOW LQ WKUHHSROH FOHDUDQFH ,I WKH $5
IXQFWLRQ LV QRW UHDG\ WR FDUU\ RXW DQ DXWRUHFORVXUH
F\FOH VHH 6HFWLRQ  WKUHHSROH FOHDUDQFHV ZLOO
DOZD\V UHVXOW ,I VLQJOHSROH DXWRUHFORVXUH LV QRW
DYDLODEOH HDFK FOHDUDQFH ZLOO HTXDOO\ EH WKUHHSROH
,I DQ H[WHUQDO $5UHOD\ LV XVHG WKH WULSSLQJ FRP
PDQG FDQ DOVR EH FRXSOHG WKUHHSROH YLD D ELQDU\
LQSXW
0RUHRYHU H[WHUQDO ELQDU\ LQSXWV FDQ EH XVHG WR UH
OHDVH WKH RYHUUHDFK ]RQHV =% DQGRU =/
)LJXUH  LOOXVWUDWHV WKH EORFN GLDJUDP RI WKH WULS
SLQJ ORJLF
7KH LQWHJUDWHG VZLWFKRQWRIDXOW ORJLF 6HFWLRQ
 FDQ EH VHW WR DFWLYDWH HLWKHU ]RQH =% GLUHF
WLRQDO RU QRQGLUHFWLRQDO RU IDXOW GHWHFWLRQ QRQGL
UHFWLRQDO DQG QRQGHOD\HG 
)RU WKH LVVXH RI WULSSLQJ FRPPDQGV WR WKH FLUFXLW
EUHDNHU DSSURSULDWHO\ SRZHUIXO WULSSLQJ UHOD\V DUH
SURYLGHG HDFK ZLWK WZR FORVLQJ FRQWDFWV 7KH WULS
SLQJ UHOD\V DUH DXWRPDWLFDOO\ UHVHW ZKHQ WKH IDXOW
GHWHFWRU UHVHWV DQG WKH IDXOW FXUUHQW KDV EHHQ
VZLWFKHG RII UHVHW RI PLQLPXP FXUUHQW PRQLWRU
 ,
 8S WR WKDW SRLQW WKH WULSSLQJ FLUFXLW PXVW EH
I
EURNHQ E\ DQ DX[LOLDU\ FRQWDFW RQ WKH FLUFXLW EUHDNHU


6ZLWFKRQWRIDXOW SURWHFWLRQ
,I RQH VZLWFKHV D GHDG EXW VKRUW FLUFXLWHG OLQH RQWR D
OLYH EXVEDU LW LV HVVHQWLDO LQ JHQHUDO WKDW WKLV OLQH EH
LPPHGLDWHO\ GLVFRQQHFWHG 8VLQJ GLVWDQFH SURWHF
WLRQ DORQH KRZHYHU GLVFRQQHFWLRQ IRU IDXOWV FORVH WR
HLWKHU OLQH HQG LV QRW DOZD\V SRVVLEOH IRU D WKUHH
SKDVH IDXOW DW WKH ORFDWLRQ RI D UHOD\ DQ DFFXUDWH
PHDVXUHG YROWDJH IRU FRUUHFW GLUHFWLRQDO GHWHUPLQD
WLRQ ZLOO QRW QHFHVVDULO\ EH DYDLODEOH ZKHQ WKH YROW
DJH WUDQVIRUPHUV DUH FRQQHFWHG RQ WKH OLQH VLGH
HYHQ VWRUHG YROWDJH YDOXHV DUH QRW DYDLODEOH ,I WKH
IDXOW LV DW WKH RSSRVLWH OLQH HQG GLVWDQFH SURWHFWLRQ
ZLOO RSHUDWH RQO\ DIWHU D WLPH GHOD\
)RU FORVHXS IDXOWV WKH GLVWDQFH SURWHFWLRQ ZLOO GH
FLGH RQ kIRUZDUGVl DIWHU FRQQHFWLRQ RI WKH OLQH ZKHQ
WKH YROWDJH VLJQDO LV PLVVLQJ 7KXV LQVWDQWDQHRXV
WULS E\ WKH ILUVW ]RQH LV SRVVLEOH
7R EH VXUH RI DQ LPPHGLDWH GLVFRQQHFWLRQ XQGHU DQ\
FRQGLWLRQ DQG HVSHFLDOO\ ZKHQ VZLWFKLQJ RQWR EROWHG
IDXOW WKH PDQXDO FORVH FRPPDQG IURP WKH GLVFUHS
DQF\ VZLWFK FDQ EH UHSHDWHG YLD D ELQDU\ LQSXW WR
FDXVH DQ LPPHGLDWH WULS VLJQDO ZKHQ D IDXOW LV GH
WHFWHG ZLWKLQ DQ DGMXVWDEOH WLPH )LJXUH   7KH
IDXOW LV FOHDUHG HLWKHU ZLWK SLFNXS RI RYHUUHDFKLQJ
]RQH =% GLUHFWLRQDO  DV LOOXVWUDWHG LQ )LJXUH  RU
SLFNXS RI RYHUUHDFKLQJ ]RQH =% QRQGLUHFWLRQDO 
RU SLFNXS RI WKH IDXOW GHWHFWRU VHOHFWDEOH ZLWKRXW
GHOD\
7KH LQWHJUDWHG VZLWFKRQWRIDXOW ORJLF RI 6$ DX
WRPDWLFDOO\ GLVWLQJXLVKHV EHWZHHQ DQ H[WHUQDO FRQ
WURO FRPPDQG DQG DQ DXWRPDWLF UHFORVH FRPPDQG
E\ PHDQV RI WKH LQWHUQDO DXWRUHFORVH FLUFXLWV VR
WKDW WKH ELQDU\ LQSXW kPDQXDO FORVHl FDQ EH FRQ
QHFWHG GLUHFWO\ WR WKH FRQWURO FLUFXLW RI WKH FORVLQJ
FRLO RI WKH FLUFXLW EUHDNHU ,I KRZHYHU H[WHUQDO FORV
LQJ FRPPDQGV DUH SRVVLEOH ZKLFK WKH VZLWFKRQWR
IDXOW SURWHFWLRQ VKDOO QRW RSHUDWH HJ H[WHUQDO DXWR
UHFORVH GHYLFHV  WKH ELQDU\ LQSXW kPDQXDO FORVHl
PXVW EH WULJJHUHG E\ D VHSDUDWH DX[LOLDU\ FRQWDFW RQ
WKH GLVFUHSDQF\ VZLWFK
0HWKRG RI RSHUDWLRQ
&*&

Advertisement

loading