Download Print this page

Siemens siprotec 7sj602 Instruction Manual page 78

Multifunction overcurrent and motor protection relay
Hide thumbs Also See for siprotec 7sj602:

Advertisement

6-
9

5HVWDUW LQKLELW IRU PRWRUV
7KH URWRU WHPSHUDWXUH RI D PRWRU OLHV IDU DZD\ IURP
WKH FULWLFDO WHPSHUDWXUH OLPLWV GXULQJ QRUPDO RSHUD
WLRQ HYHQ ZLWK LQFUHDVHG ORDG ,Q FRQWUDVW GXULQJ
VWDUWXS RI WKH PRWRU WKH URWRU LV WKHUPDOO\ HQGDQ
JHUHG UDWKHU WKDQ WKH VWDWRU EHFDXVH RI LWV VPDOOHU
WLPH FRQVWDQW LQ FRQQHFWLRQ ZLWK WKH H[FHVVLYHO\
KLJK VWDUWXS FXUUHQWV 7KHUHIRUH LW LV DGYLVDEOH WKDW
WKH PRWRU VWDUW LV DYRLGHG ZKHQ RYHUKHDWLQJ RI WKH
URWRU LV H[SHFWHG GXULQJ UXQXS
7KH URWRU FXUUHQW FDQQRW EH PHDVXUHG GLUHFWO\
7KXV WKH UHVWDUW ORFNRXW IXQFWLRQ RI 6- DSSUR[L
PDWHV WKH URWRU WHPSHUDWXUH ULVH IURP WKH VWDWRU FXU
UHQWV ,W LV DVVXPHG WKDW WKH OLPLW WHPSHUDWXUH RI WKH
URWRU LV UHDFKHG ZKHQ WKH PRWRU LV HQHUJL]HG ZLWK
WKH UDWHG VWDUWXS FXUUHQW DV PXFK WLPH DV LW LV SHU
PLVVLEOH DFFRUGLQJ WR WKH GDWD VWDWHG E\ WKH PDQ
XIDFWXUHU RI WKH PRWRU 7KH UHOD\ FDOFXODWHV IURP WKLV
GDWD WKH WKHUPDO FKDUDFWHULVWLFV ZKLFK DUH GHFLVLYH
IRU WKHUPDO UHSOLFD RI WKH URWRU 5HVWDUW RI WKH PRWRU LV
ORFNHG DV ORQJ DV WKH FDOFXODWHG UHVWDUW OLPLW VHH
3
PD[ URWRU WHPSHUDWXUH
7HPSHUDWXUH DW
XSSHU HGJH RI FDJH EDU
ORZHU HGJH RI FDJH EDU
WKHUPDO UHSOLFD
VW
VWDUW
PRWRU HQHUJL]HG
FXUUHQW
&% ,!
)LJXUH  7HPSHUDWXUH SURJUHVV LQ WKH URWRU DQG WKH WKHUPDO UHSOLFD GXULQJ UHSHDWHG PRWRU UXQXS

QG
VWDUW
7HTXDO
PRWRU HQHUJL]HG
)LJXUH  LV H[FHHGHG 2QO\ ZKHQ WKLV OLPLW LV XQ
GHUVKRW UHVWDUW LV UHOHDVHG
6ZLWFKRQ RI WKH PRWRU YLD WKH LQWHJUDWHG FRQWURO
IXQFWLRQV LV DYRLGHG GXULQJ UHVWDUW LQKLELW VR WKDW QR
PHDVXUHV QHHG EH WDNHQ OLNH ORJLFDO FRPELQDWLRQ RU
PDUVKDOOLQJ RI WKH ORFNRXW FRPPDQG %XW LI WKH PR
WRU FDQ EH VWDUWHG IURP H[WHUQDO FRQWURO FRPPDQGV
WKHQ WKH ORFNRXW FRPPDQG PXVW EH DVVLJQHG WR DQ
RXWSXW UHOD\ DQG FRPELQHG ZLWK WKH H[WHUQDO FRP
PDQG VR WKDW WKH ODWWHU LV ORFNHG DJDLQVW UHVWDUW
,W LV RI QR FRQFHUQ WKDW WKH KHDW GLVWULEXWLRQ RQ WKH UR
WRU FDJH EDU LV PXFK GLIIHUHQW DQG SURGXFHV VHYHUDO
KRW VSRWV EXW LW LV GHFLVLYH WKDW WKH WKHUPDO UHSOLFD RI
WKH SURWHFWLRQ FRUUHVSRQGV WR WKH WKHUPDO VWDWH RI
WKH PRWRU DIWHU UXQXS )LJXUH  VKRZV DV DQ H[
DPSOH WKH KHDWLQJXS SURJUHVV GXULQJ UHSHDWHG
VWDUWXS RI D PRWRU DQG WKH SURJUHVV RI WKH FDOFX
ODWHG WKHUPDO UHSOLFD RI WKH SURWHFWLRQ
UHVWDUW OLPLW
UG
VWDUW
7HTXDO
PRWRU HQHUJL]HG
0HWKRG RI RSHUDWLRQ
FRROLQJGRZQ ZLWK
i N 
FRROLQJGRZQ ZLWK
i N
7HTXDO
&*&
W
W

Advertisement

loading