Sel 411L - Table 3.46 ESS:= N, Current and Voltage Source Selection

P.3.112
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
Current and Voltage Source Selection
➤ Fault location
➤ Open-phase detection logic
➤ LOP (loss-of-potential) logic
➤ FIDS (fault-type identification selection) logic
➤ Directional elements
➤ CVT (capacitor voltage transformer) transient detection logic
➤ Series-compensation line logic
➤ Load-encroachment logic
➤ OOS (out-of-step) logic
➤ Distance elements
➤ SOTF (switch-onto-fault) logic
➤ POTT (permissive overreaching transfer tripping) scheme logic
➤ Metering on page P.9.25, including synchrophasors
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 3.64 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 3.64 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 3.42).
Table 3.46 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