Sel 411L - Figure 3.66 ESS:= 3, Double Circuit Breaker Configuration; Table 3.49 ESS:= 3, Current and Voltage Source Selection

P.3.114
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
Current and Voltage Source Selection
ESS := 3, Double Circuit Breaker Configuration—Independent Current Inputs
Set ESS to 3 for circuit breaker-and-a-half applications using independent
current sources. Figure 3.66 illustrates this application along with the
corresponding current and voltage sources. This selection provides
independent circuit breaker failure protection for Circuit Breaker 1 and Circuit
Breaker 2.
Figure 3.66 ESS := 3, Double Circuit Breaker Configuration
ALINEI Alternate line current source (IX, NA) NA
ALTI Alternate current source (SEL
OGIC equation) NA Hidden
a
BK1I Breaker 1 current source (IX) IX Automatic
BK2I Breaker 2 current source (NA) NA Hidden
IPOL Polarizing current (NA) NA Automatic
ALINEV Alternate line voltage source (VZ, NA) NA
ALTV Alternate voltage source (SEL
OGIC equation) NA Hidden
a
Hidden when preceding setting is NA.
Table 3.48 ESS := 2, Current and Voltage Source Selection
Setting Description Entry Comments
Table 3.49 ESS := 3, Current and Voltage Source Selection (Sheet 1 of 2)
Setting Description Entry Comments
NUMBK Number of circuit breakers in scheme (1, 2) 2
LINEI Line current source (COMB) COMB Automatic
ALINEI Alternate line current source (NA) NA Automatic
ALTI Alternate current source (SEL
OGIC equation) NA Hidden
BK1I Breaker 1 current source (IW) IW Automatic
BK2I Breaker 2 current source (IX) IX Automatic
Analog Input
IW+IX
IW
IX
VY
VAZ
VBZ
Function
Line protection
CB1 protection
CB2 protection
Line protection
Synchronism check Circuit Breaker 1
Synchronism check Circuit Breaker 2
3
3
1 1
Busbar 1 Busbar 2
1
Relay
Breaker 1 Breaker 2
IW
IX
VY
VAZ
VBZ
Line 1
Line 2