Sel SEL-421 - Default Applications; ESS:= 1, Single Circuit Breaker Configuration

R.1.8
SEL-421 Relay Reference Manual Date Code 20111215
Protection Functions
Current and Voltage Source Selection
Default Applications
Use setting ESS (Current and Voltage Source Selection) to easily configure
the relay for your particular application. Five application settings (ESS := N,
1, 2, 3, or 4) cover both single circuit breaker and two circuit breaker
configurations. If you select one of these five setting choices, the relay
automatically determines the following settings:
NOTE: Setting BK2I is hidden if
setting NUMBK, Number of Breakers
in the Scheme, is set to 1.
➤ LINEI—Line Current Source (IW, COMB)
➤ BK1I—Breaker 1 Current Source (IW, IX, NA)
➤ BK2I—Breaker 2 Current Source (IX, COMB, NA)
ESS := N, Single Circuit Breaker Configuration—One Current Input
Set ESS to N for single circuit breaker applications with one current input.
Figure 1.5 illustrates this application along with the corresponding current and
voltage sources. When ESS equals N, you cannot use alternate sources
(ALINEI and ALINEV) and the relay hides the Global settings LINEI,
ALINEI, ALTI, BK1I, BK2I, IPOL, ALINEV, and ALTV.
ESS := 1, Single Circuit Breaker Configuration—One Current Input
Set ESS to 1 for single circuit breaker applications with one current input.
Figure 1.5 illustrates this application along with the corresponding current and
voltage sources.
With ESS := 1, the IX current channels have the option to be used as an
alternate line current source (ALINEI:= IX) or as a polarizing current channel
(e.g., IPOL:= IBX), but not both (see Table 1.1).
Figure 1.5 ESS := 1, Single Circuit Breaker Configuration
Table 1.5 ESS := N, Current and Voltage Source Selection
Setting Description Entry Comments
NUMBK Number of Breakers in Scheme (1, 2) 1
LINEI Line Current Source (IW, COMB) IW Hidden
BK1I Breaker 1 Current Source (IW, IX, NA) IW Hidden
BK2I Breaker 2 Current Source (IX, COMB, NA) NA Hidden
SEL-421 Relay
BUS
CB1
3
3
IW
VAZ
VY
1
Analog Input
IW
VY
VAZ
Function
CB1 protection, line protection
Line protection
Synchronism check