Download Print this page

Siemens SIPROTEC 7SA511 Instruction Manual page 79

Numerical distance protection relay

Advertisement

6$
9
 +LJKUHVLVWDQFH HDUWK IDXOW SURWHFWLRQ LQ HDUWKHG V\VWHPV RSWLRQDO
,Q HDUWKHG QHWZRUNV LQ ZKLFK WKH HDUWK SDWK UHVLV
WDQFH FDQ EH H[WUHPHO\ KLJK HJ RYHUKHDG OLQHV
ZLWKRXW OLJKWQLQJ SURWHFWLRQ FRQGXFWRU RU VDQG\
VRLOV WKH RYHUFXUUHQW  VRPHWLPHV HYHQ WKH XQGHU
LPSHGDQFH  HOHPHQW ZLOO RIWHQ QRW SLFN XS VR WKDW
QR SKDVH VHOHFWLRQ LV SRVVLEOH IRU WKH GLVWDQFH PHD
VXUHPHQW (YHQ ZKHQ XVLQJ LPSHGDQFH IDXOW GHWHF
WLRQ HDUWK IDXOW LPSHGDQFHV FDQ RFFXU ZKLFK DS
SHDU WR OLH RXWVLGH WKH SLFNXS FKDUDFWHULVWLF RI WKH
GLVWDQFH UHOD\
'LVWDQFH SURWHFWLRQ 6$ GHSHQGHQW XSRQ WKH
PRGHO RUGHUHG VHH 6HFWLRQ  2UGHULQJ GDWD  FDQ
SURYLGH SURWHFWLYH IXQFWLRQV IRU VXFK KLJK UHVLVWDQFH
HDUWK IDXOWV 2QH RI WKH IROORZLQJ IHDWXUHV FDQ WKHQ
EH VHOHFWHG
 GLUHFWLRQDO HDUWK IDXOW SURWHFWLRQ GHILQLWH WLPH
HDUWK RYHUFXUUHQW SURWHFWLRQ ZLWK QRQGLUHFWLRQDO
EDFNXS DQG VWDQGE\ SURWHFWLRQ IXQFWLRQ
 QRQGLUHFWLRQDO LQYHUVH WLPH ODJ RYHUFXUUHQW WLPH
SURWHFWLRQ IRU HDUWK IDXOWV ZLWK VHOHFWDEOH FKDUDF
WHULVWLFV
7KH GLUHFWLRQDO HDUWK IDXOW SURWHFWLRQ FDQ EH H[
WHQGHG E\ DQ LQWHJUDWHG GLUHFWLRQDO FRPSDULVRQ ORJ
LF VR WKDW E\ PHDQV RI D FDUULHU FKDQQHO IDVW DQG VH
OHFWLYH WULSSLQJ IRU KLJK UHVLVWDQFH HDUWK IDXOWV LV DOVR
SRVVLEOH
7KH QRQGLUHFWLRQDO LQYHUVH WLPH SURWHFWLRQ LV XVHG
PRVWO\ IRU KLJKO\ LQWHUOLQNHG DOOURXQG HDUWKHG QHW
ZRUNV ZLWK KLJK UHVLVWDQFH HDUWK IDXOWV ZKHUH WKH
HQGV RI WKH IDXOW\ OLQH VHFWLRQ FDUU\ WKH ODUJHVW IDXOW
FXUUHQW DQG WKXV SURGXFH WKH VKRUWHVW WULSSLQJ WLPH
8
!
'LUHF
(
WLRQ

,
!
(
,
!
(
)LJXUH 
'LUHFWLRQDO HDUWK SURWHFWLRQ ZLWK
QRQGLUHFWLRQDO EDFNXS VWDJH
&*&
7
!
',5(&7

7ULS
7
121
',5

'LUHFWLRQDO HDUWK IDXOW SURWHFWLRQ
7KH GLUHFWLRQDO HDUWK IDXOW SURWHFWLRQ )LJXUH 
KDV DQ DGMXVWDEOH HDUWK FXUUHQW GHWHFWLRQ HOHPHQW
,
! DQG DQ DGMXVWDEOH GHOD\ WLPH %HFDXVH RI WKH
(
SRVVLELOLW\ RI GLUHFWLRQDO FRPSDULVRQ VHH 6HFWLRQ
  GHWHFWLRQ LV WZRVWDJH D ORZHU YDOXH 
UHOHDVHV GLUHFWLRQDO GHWHUPLQDWLRQ )RU WULSSLQJ WKH
KLJK YDOXH VWDJH PXVW DGGLWLRQDOO\ EH H[FHHGHG
FRUUHVSRQGLQJ WR WKH VHW YDOXH RI ,
'LUHFWLRQDO GHWHUPLQDWLRQ UHTXLUHV D OHDVW YDOXH GLV
SODFHPHQW YROWDJH IRU ZKLFK WKH 8
XVHG ,I WKH GLVSODFHPHQW YROWDJH LV WRR VPDOO D GL
UHFWLRQDO GHWHUPLQDWLRQ DQG WKXV GLUHFWLRQDOGHSHQ
GHQW WULSSLQJ LV QRW SRVVLEOH 'LUHFWLRQDO GHWHUPLQD
WLRQ LV DOVR VXSSUHVVHG DQG WULSSLQJ SUHYHQWHG ZKHQ
WKH LQGLFDWLRQ kYROWDJH WUDQVIRUPHU SURWHFWLYH GHYLFH
WULSSHGl LV VLJQDOOHG WR WKH UHOD\ YLD D ELQDU\ LQSXW
7KH FULWHULRQ IRU WKH GHOD\ WLPH LV WKH VHWWLQJ 7 ',
5(&7
$ IXUWKHU WLPH VWDJH 7121',5 ZLOO FDXVH WULSSLQJ
ZLWKRXW GLUHFWLRQDO PHDVXUHPHQW ,W FDQ EH VHW DV D
QRQGLUHFWLRQDO EDFNXS VWDJH IRU WKH GLUHFWLRQDO
VWDJH ,I WKH GLVSODFHPHQW YROWDJH LV WRR VPDOO RU LI
WKH YROWDJH WUDQVIRUPHU SURWHFWLYH GHYLFH KDV RSHU
DWHG WKLV VWDJH UHPDLQV HIIHFWLYH DQG FDQ DOVR VHUYH
DV DQ HPHUJHQF\ IXQFWLRQ IRU WKH GLUHFWLRQDO HDUWK
IDXOW SURWHFWLRQ DQG WKH HDUWK IDXOW GLUHFWLRQDO FRP
SDULVRQ SURWHFWLRQ
7KH HDUWK IDXOW GLUHFWLRQDO IXQFWLRQ LV EORFNHG IURP
WKH GLVWDQFH SURWHFWLRQ RU HPHUJHQF\ RYHUFXUUHQW
SURWHFWLRQ :KHQ WKH IDXOW LV GHWHFWHG E\ WKH GLV
WDQFH SURWHFWLRQ RU HPHUJHQF\ RYHUFXUUHQW WLPH
SURWHFWLRQ WKH HDUWK IDXOW SURWHFWLRQ GRHV QRW RSHU
DWH 7KLV JLYHV VHOHFWLYH IDXOW GHWHUPLQDWLRQ E\ WKH
GLVWDQFH SURWHFWLRQ SUHIHUHQFH RYHU WULSSLQJ E\ WKH
HDUWK IDXOW SURWHFWLRQ $GGLWLRQDOO\ WKH HDUWK IDXOW GL
UHFWLRQDO SURWHFWLRQ LV EORFNHG GXULQJ D VLQJOHSROH
DXWRUHFORVH F\FOH WR SUHYHQW IURP HUURQHRXV PHD
VXUHPHQW ZLWK WKH ]HUR VHTXHQFH TXDQWLWLHV ZKLFK
DUH QRZ SUHVHQW ,Q FDVH D IDXOW LV FOHDUHG E\ DQ H[
WHUQDO SURWHFWLRQ GHYLFH EORFNLQJ RI WKH HDUWK IDXOW
SURWHFWLRQ FDQ EH H[WHQGHG E\ DQ DGMXVWDEOH WLPH
7%/2&. WR DOORZ D VLQJOH SKDVH DXWRUHFORVLQJ
F\FOH WR EH FDUULHG RXW
0HWKRG RI RSHUDWLRQ
,
!

(
! 
(
! VHWWLQJ LV
(


Advertisement

loading