Sel SEL-421 - Available Current Source Selection Settings Combinations

R.1.4
SEL-421 Relay Reference Manual Date Code 20111215
Protection Functions
Current and Voltage Source Selection
NA = not applicable
Shaded cells indicate settings forced to given values and hidden.
NA = not applicable
Shaded cells indicate settings forced to given values and hidden
Table 1.1 Available Current Source Selection Settings Combinations
NUMBK
(number of
breakers)
ESS
(source
selection)
LINEI
(line current source)
ALINEI
(alternate
line current
source)
BK1I
(Breaker 1
current
source)
BK2I
(Breaker 2
current
source)
IPOL
(polarizing
current)
1 Y see Table 1.2
1N
IW NA IW NA NA
1 1 IW IX IW
NA NA
1 1 IW NA IW
NA IAX, IBX, ICX,
or NA
1 2 IW IX IX
NA NA
12 IW NA IX
NA NA
1 3 not allowed
1 4 not allowed
2 Y see Table 1.3
2N
IW NA IW NA NA
2 1 not allowed
2 2 not allowed
2 3 COMB NA IW IX NA
2 4 IW NA IX COMB NA
Table 1.2 Available Current Source Selection Settings Combinations When ESS := Y, NUMBK := 1
NUMBK
(number of
breakers)
ESS
(source
selection)
LINEI
(line current source)
ALINEI
(alternate line
current
source)
BK1I
(Breaker 1
current
source)
BK2I
(Breaker 2
current
source)
IPOL
(polarizing
current)
1 Y IW IX IW NA NA
1 Y IW IX IX
NA NA
1 Y IW IX NA
NA NA
1 Y IW NA IW
NA IAX, IBX, ICX,
or NA
1 Y IW NA IX
NA NA
1 Y IW NA NA
NA IAX, IBX, ICX,
or NA
1 Y COMB IX IW
NA NA
1 Y COMB IX IX
NA NA
1Y COMB IX NA
NA NA
1Y COMB NA IW
NA NA
1Y COMB NA IX
NA NA
1 Y COMB NA NA
NA NA