Siemens SIPROTEC 7SJ600 - Thermal Overload Protection Operation

0HWKRG RI RSHUDWLRQ6-
9
&* &
 7KHUPDO RYHUORDG SURWHFWLRQ
7KH WKHUPDO RYHUORDG SURWHFWLRQ SUHYHQWV WKH SUR
WHFWHG REMHFW HJ LQ FDVH RI FDEOHV RU PRWRUV IURP
GDPDJH FDXVHG E\ WKHUPDO RYHUORDGLQJ 7KLV SUR
WHFWLRQ RSHUDWHV LQGHSHQGHQW RQ WKH WLPH RYHUFXU
UHQW DQG XQEDODQFHG ORDG SURWHFWLRQ
7KH SURWHFWLRQ FDQ EH RSWLRQDOO\ VHW WR HYDOXDWH DOO
ORDG FXUUHQWV HYHQ ZKHQ RYHUORDG LV QRW \HW SUHVHQW
WKHUPDO RYHUORDG SURWHFWLRQ ZLWK WRWDO PHPRU\ RU WR
HYDOXDWH RQO\ WKH ORDG FXUUHQWV ZKHQ DQ DGMXVWDEOH
RYHUORDG WKUHVKROG KDV EHHQ H[FHHGHG RYHUORDG
SURWHFWLRQ ZLWKRXW PHPRU\
 2YHUORDG SURWHFWLRQ ZLWK WRWDO
PHPRU\
7KH XQLW FRPSXWHV WKH WHPSHUDWXUH ULVH DFFRUGLQJ
WR D WKHUPDO VLQJOHERG\ PRGHO DV SHU WKH IROORZLQJ
WKHUPDO GLIIHUHQWLDO HTXDWLRQ
G3
GW

U
WK

U
WK
3 k ,

 k
ZLWK 3  DFWXDO WHPSHUDWXUH ULVH UHODWHG RQ WKH ILQDO
WHPSHUDWXUH ULVH IRU WKH PD[LPXP SHU
PLVVLEOH FXUUHQW Ni,
1
U
WK
 WKHUPDO WLPH FRQVWDQW IRU KHDWLQJXS RI
WKH SURWHFWHG REMHFW
,  DFWXDO FXUUHQW UPV YDOXH UHODWHG RQ WKH
PD[LPXP SHUPLVVLEOH FXUUHQW RI WKH SUR
WHFWHG REMHFW ,
PD[
Ni,
1
:KHQ WKH WHPSHUDWXUH ULVH UHDFKHV D ILUVW VHW WKUHVK
ROG D ZDUQLQJ DODUP LV JLYHQ LQ RUGHU WR UHQGHU SRV
VLEOH DQ HDUO\ ORDG UHGXFWLRQ ,I WKH WULS WHPSHUDWXUH
WKUHVKROG LV UHDFKHG WKH SURWHFWHG REMHFW FDQ EH
GLVFRQQHFWHG IURP WKH QHWZRUN
7KH WHPSHUDWXUH ULVHV DUH FDOFXODWHG VHSDUDWHO\ IRU
HDFK LQGLYLGXDO SKDVH 7KH PD[LPXP FDOFXODWHG
WHPSHUDWXUH ULVH RI WKH WKUHH SKDVHV LV GHFLVLYH IRU
WKH VHW WKUHVKROGV $ WUXH UPV YDOXH PHDVXUHPHQW
LV SHUIRUPHG LQ RUGHU WR LQFOXGH IRU WKH HIIHFW RI KDU
PRQLF FRQWHQW
7KH PD[LPXP SHUPLVVLEOH FRQWLQXRXV WKHUPDO RYHU
ORDG FXUUHQW ,
PD[
LV GHVFULEHG DV D PXOWLSOH RI WKH
UDWHG FXUUHQW ,
1

,
PD[
N

,
1
ZKHUH N IDFWRU DFFRUGLQJ WR ,(&  RU
9'(  SDUW 
,Q DGGLWLRQ WR WKH NIDFWRU WKH WKHUPDO WLPH FRQVWDQW
U
WK
DV ZHOO DV WKH DODUP WHPSHUDWXUH 3
ZDUQ
PXVW EH
HQWHUHG LQWR WKH SURWHFWLRQ XQLW
:KHQ WKH ZDUQLQJ WKUHVKROG 3
ZDUQ
KDV EHHQ
UHDFKHG WKH SURWHFWLRQ FRPSXWHV WKH H[SHFWHG
WLPH XQWLO WULS VWHDG\VWDWH FXUUHQW DVVXPHG DQG
PDNHV LW DYDLODEOH LQ WKH RSHUDWLRQDO PHDVXUHG YDO
XHV 7KH DSSOLHG IRUPXOD LV

 
W
WULS
U
WK k
OQ
,

 3
,
ZLWK W
WULS
 H[SHFWHG WLPH XQWLO WULS
3 DFWXDO WHPSHUDWXUH ULVH UHODWHG RQ WKH
ILQDO WHPSHUDWXUH ULVH IRU WKH PD[LPXP
SHUPLVVLEOH FXUUHQW Ni,
1
U
WK
 WKHUPDO WLPH FRQVWDQW IRU KHDWLQJXS RI
WKH SURWHFWHG REMHFW
,  DFWXDO FXUUHQW UPV YDOXH UHODWHG RQ
WKH PD[LPXP SHUPLVVLEOH FXUUHQW RI
WKH SURWHFWHG REMHFW ,
PD[
Ni,
1
$IWHU WKH RYHUORDG SURWHFWLRQ KDV WULSSHG WKH WLPH LV
FDOFXODWHG DQG LQGLFDWHG XQWLO WKH WHPSHUDWXUH ULVH
ZLOO KDYH EHHQ IDOOHQ EHORZ WKH ZDUQLQJ WHPSHUDWXUH
ULVH LH XQWLO WKH SURWHFWLRQ ZLOO GURS RII 7KLV LV WKH
WLPH SHULRG EHIRUH ZKLFK WKH SURWHFWHG REMHFW
VKRXOG QRW EH UHHQHUJL]HG 7KH SURWHFWLRQ XVHV IRU
WKLV FDOFXODWLRQ WKH FRROLQJGRZQ WLPH FRQVWDQW
ZKLFK FDQ EH VHW DV D IDFWRU RI WKH KHDWLQJXS WLPH
FRQVWDQW 7KXV LW LV FRQVLGHUHG WKDW ZLWK PRWRUV
ZLWK VHOIYHQWLODWLRQ WKH FRROLQJGRZQ SURFHVV ODVWV
ORQJHU EHFDXVH WKH URWRU GRHV QRW YHQWLODWH ,Q WKLV
DVSHFW WKH PRWRU LV DVVXPHG WR VWDQG VWLOO ZKHQ WKH
FXUUHQW FRQVXPSWLRQ LV OHVV WKDQ  WLPHV UDWHG
UHOD\ FXUUHQW

,


,

W
FORVH
3
U
WK
k OQ
3
ZDUQ
IRU,k,
1
N
U
k
ZLWK W
FORVH
 WLPH DIWHU ZKLFK UHFORVXUH LV SHUPLWWHG
,  DFWXDO FXUUHQW
U
WK
 KHDWLQJXS WLPH FRQVWDQW
N
U
 SURORQJDWLRQ IDFWRU IRU FRROLQJ GRZQ
3  DFWXDO WHPSHUDWXUH ULVH
3
ZDUQ
SDUDPHWHUL]HG ZDUQLQJ WHPSHUDWXUH
ULVH
www . ElectricalPartManuals . com