Schweitzer Engineering Laboratories SEL-421-4 - Table 5.1 Available Current Source Selection Settings Combinations; Table 5.2 Available Current Source Selection Settings Combinations When ESS:= Y, NUMBK:= 1

5.4
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Functions
Current and Voltage Source Selection
Table 5.1 Available Current Source Selection Settings Combinations
a
a
NA = not applicable.
Shaded cells indicate settings forced to given values and hidden.
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)
1Ysee Ta ble 5. 2
1N
IW NA IW NA NA
11IWIXIW
NA NA
11IWNAIW
NA IAX, IBX, ICX,
or NA
12IWIX IX
NA NA
12IWNAIX
NA NA
13not allowed
14not allowed
2Ysee Ta ble 5. 3
2N
IW NA IW NA NA
21not allowed
22not allowed
23COMBNAIWIXNA
24IWNAIXCOMBNA
Table 5.2 Available Current Source Selection Settings Combinations When ESS := Y, NUMBK := 1
a
a
NA = not applicable.
Shaded cells indicate settings forced to given values and hidden.
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
1YCOMBIXNA
NA NA
1YCOMBNAIW
NA NA
1YCOMBNAIX
NA NA
1 Y COMB NA NA
NA NA