P.3.115
Date Code 20151029 Protection Manual SEL-411L Relay
Protection Functions
Current and Voltage Source Selection
ESS := 4, Double Circuit Breaker Configuration—Common Current Inputs
Set ESS to 4 for circuit breaker-and-a-half applications using combined
current input IW. Figure 3.67 illustrates this application along with the
corresponding current and voltage sources. Current input IX provides circuit
breaker failure protection for Circuit Breaker 1; the corresponding CTs are
located on the line-side of Circuit Breaker 1. The relay calculates the current
flowing through Circuit Breaker 2 (I
CB2
= IW + IX= I
CB1
+ I
CB2
+ IX = I
CB1
+ I
CB2
– I
CB1
) to provide independent circuit breaker failure for Circuit
Breaker 2.
Figure 3.67 ESS := 4, Double Circuit Breaker Configuration
ESS := Y, Other
Applications
Set ESS to Y for applications that are not covered under the five default
applications.
IPOL Polarizing current (NA) NA Automatic
ALINEV Alternate line voltage source (VZ, NA) NA
ALTV Alternate voltage source (SEL
OGIC equation) NA Hidden
Table 3.49 ESS := 3, Current and Voltage Source Selection (Sheet 2 of 2)
Setting Description Entry Comments
Table 3.50 ESS := 4, Current and Voltage Source Selection
Setting Description Entry Comments
NUMBK Number of circuit breakers in Scheme (1, 2) 2
LINEI Line current source (IW) IW Automatic
ALINEI Alternate current source (NA) NA Automatic
ALTI Alternate current source (SEL
OGIC equation) NA Hidden
BK1I Breaker 1 current source (IX) IX Automatic
BK2I Breaker 2 current source (COMB) COMB Automatic
IPOL Polarizing current (NA) NA Automatic
ALINEV Alternate line voltage source (VZ, NA) NA
ALTV Alternate voltage source (SEL
OGIC equation) NA Hidden
Relay
BUS 1 BUS 2
CB1 CB2
33
3
3
IW
IX
VAZ
VY
VBZ
1
1
Analog Input
IW+IX
IW
IX
VY
VAZ
VBZ
Function
CB2 protection
Line protection
CB1 protection
Line protection
Synchronism check Circuit Breaker 1
Synchronism check Circuit Breaker 2
I
CB1
I
CB2
I
LINE
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