/PERATING INSTRUCTIONS
3*
6
# ' #
&OR 2!2 FIRST AUTO RECLOSE CYCLE ADDRESSES
TO ARE TO BE SET
7HEN SETTING THE ACTION TIME 2!2 4 !#4 ADDRESS
IT MUST BE ENSURED THAT THIS TIME IS AT LEAST AS
LONG AS THE COMMAND TIME OF THE PROTECTIVE RELAY )T
CAN ALSO BE USED TO AVOID AUTO RECLOSURE WHEN A
PROTECTION FUNCTION HAS TRIPPED A FAULT IN A BACK UP
TIME
4HE DEAD TIMES CAN BE INDIVIDUALLY SET AFTER TRIP FOL
LOWING A MULTI PHASE FAULT ADDRESS AND AFTER
TRIP OF A SINGLE PHASE FAULT ADDRESS 4HE DU
RATION OF THE DEAD TIMES IS DETERMINED BY THE APPLI
CATION PHILOSOPHY &OR LONG LINES IT SHOULD BE LONG
ENOUGH TO ENSURE THAT THE FAULT ARC IS EXTINGUISHED
AND THE AIR SURROUNDING THE ARC IS DE IONIZED SO
THAT AUTO RECLOSURE CAN BE SUCCESSFUL S TO
S 7ITH MULTIPLE END FED LINES THE STABILITY OF THE
NETWORK IS THE IMPORTANT CONSIDERATION 3INCE THE
DISCONNECTED LINE CAN NO LONGER PRODUCE ANY SYN
CHRONIZING POWER ONLY A SHORT DEAD TIME IS PER
MITTED IN MOST CASES #ONVENTIONAL VALUES LIE BE
TWEEN S AND S )N RADIAL NETWORKS A LONGER
TIME CAN BE TOLERATED
&OR $!2 FURTHER AUTO RECLOSE CYCLES PARAMETERS
ARE SET UNDER ADDRESSES TO
4HE NUMBER OF $!2S CAN BE SET DIFFERENTLY FOR
SINGLE PHASE FAULTS ADDRESS AND FOR MULTI
PHASE FAULTS ADDRESS 4HIS TYPE OF FAULT IS DE
CIDED WITH FAULT DETECTION OF THE FIRST FAULT
&OR $!2 A SEPARATE ACTION TIME $!2 4 !#4 CAN BE
SET ADDRESS
$IFFERENT DEAD TIMES CAN BE SET FOR TRIP AFTER SINGLE
PHASE FAULTS ADDRESS AND TRIP AFTER MULTI
PHASE FAULTS ADDRESS
!CTION TIME FOR 2!2 FIRST !2 SHOT IF TRIP SIGNAL
IS GIVEN AFTER THIS TIME !2 IS BLOCKED
3MALLEST SETTING VALUE
,ARGEST SETTING VALUE
AND
0
S
S
2!2 4 !#4
S
m
n
$EAD TIME FOR 2!2 CYCLE FOLLOWING MULTI PHASE FAULT
3MALLEST SETTING VALUE
,ARGEST SETTING VALUE
S
S
2!2 4 0(!
S
m
n
$EAD TIME FOR 2!2 CYCLE FOLLOWING SINGLE PHASE FAULT
3MALLEST SETTING VALUE
,ARGEST SETTING VALUE
S
S
2!2 4 %!2
S
m
n
.UMBER OF PERMISSIBLE $!2 CYCLES AFTER SINGLE
PHASE FAULTS THE 2!2 IS NOT INCLUDED IN THIS NUMBER
3MALLEST SETTING VALUE
,ARGEST SETTING VALUE
$!2 3(/4 %
m
.UMBER OF PERMISSIBLE $!2 CYCLES AFTER MULTI PHASE
FAULTS THE 2!2 IS NOT INCLUDED IN THIS NUMBER
3MALLEST SETTING VALUE
,ARGEST SETTING VALUE
$!2 3(/4 0
n
!CTION TIME FOR $!2 FURTHER !2 SHOTS IF TRIP SIGNAL
IS GIVEN AFTER THIS TIME !2 IS BLOCKED
3MALLEST SETTING VALUE
,ARGEST SETTING VALUE
AND
0
S
S
$!2 4 !#4
S
m
n
$EAD TIME FOR $!2 CYCLE FOLLOWING SINGLE PHASE FAULT
3MALLEST SETTING VALUE
,ARGEST SETTING VALUE
S
S
$!2 4 %!2
S
m
n
$EAD TIME FOR $!2 CYCLE FOLLOWING MULTI PHASE FAULT
3MALLEST SETTING VALUE
,ARGEST SETTING VALUE
S
S
$!2 4 0(!
S
m
www
. ElectricalPartManuals
. com