Advertisement
1(87 5 1HXWUDO 5HYHUVH
7KLV PRGH RI RSHUDWLRQ LV LQWHQGHG IRU XVH RQ V\VWHPV
ZKHUH UHYHUVH SRZHU IORZ LV DQ DEQRUPDO VLWXDWLRQ
,Q WKLV PRGH WKH FRQWUROOHU DOZD\V RSHUDWHV LQ WKH IRUZDUG
PRGH :KHQ FXUUHQW PDJQLWXGH GURSV EHORZ WKH IRUZDUG I
7KUHVKROG
VHWSRLQW WDS FKDQJHV DUH LQKLELWHG :KHQ
WKH UHYHUVH FXUUHQW PDJQLWXGH H[FHHGV I 7KUHVKROG
SRLQW IRU WHQ VHFRQGV WKH WDS FKDQJHU UHVXPHV RSHUDWLRQ
DQG UHWXUQV WKH WDS FKDQJHU WR WKH QHXWUDO SRVLWLRQ ZLWKRXW
VWRSSLQJ 7KH WDS FKDQJHU WKHQ UHPDLQV DW WKH QHXWUDO
SRVLWLRQ XQWLO IRUZDUG FXUUHQW PDJQLWXGH RQFH DJDLQ
H[FHHGV WKH I 7KUHVKROG
Reverse Current
Return to neutral
after ten seconds
Continue return
to neutral
1HXWUDO 5HYHUVH 0RGH
Figure 6.6
6LHPHQV 3RZHU 7UDQVPLVVLRQ
VHWSRLQW
Tap changes inhibited
RPF indicator on
Band indicators flashing
Threshold %
1%
I
'LVWULEXWLRQ //&
0-; &RQWURO 3DQHO $XWRPDWLF 0RGH
,I ZKLOH WKH WDS FKDQJHU LV UHWXUQLQJ WR QHXWUDO WKH IRU
ZDUG FXUUHQW PDJQLWXGH LQFUHDVHV DERYH WKH I 7KUHVKROG
VHWSRLQW QRUPDO IRUZDUG WDS FKDQJHU RSHUDWLRQ
UHVXPHV
,I WKH I 7KUHVKROG
RSHUDWHV DV DERYH XVLQJ WKH
SODFH RI WKH I 7KUHVKROG
VHW
1HXWUDO 5HYHUVH PRGH LV GHSHQGHQW XSRQ WKH 0-; WDS
WUDFNLQJ DOJRULWKP ,I WKH WDS SRVLWLRQ LV XQNQRZQ WR WKH
PLFURSURFHVVRU WKH WDS FKDQJHU LGOHV DW WKH ODVW KHOG SRVL
WLRQ
9LHZ 3ZU )ORZ 1(87 5 RQ WKH &21),*85(! 0HQX
Forward Current
0
1%
Threshold %
I
Current
VHWSRLQW LV VHW WR ]HUR WKH UHJXODWRU
RSHUDWLRQDO OLPLWV LQ
VHWSRLQWV
Forward operation
RPF indicator off
Band Indicator LEDs on
Advertisement
