Schweitzer Engineering Laboratories SEL-421-4 - Figure 2.43 Topology 1; Figure 2.44 Topology 2

2.43
Date Code 20171021 Instruction Manual SEL-421 Relay
Installation
Connection
Figure 2.43 Topology 1
IAW,
IBW,
ICW
Line
VAY,
VBY,
VCY
IAX,
IBX,
ICX
1 Phase
(VAZ)
1 Phase
(VBZ)
Port
6A
6B
6C
6D
6E
6F
Analogs
IAW, IBW, ICW
IAX, IBX, ICX (optional)
VAY, VBY, VCY
VAZ (optional)
VBZ (optional)
VCZ (optional)
SEL Relay
SEL Axion
SEL Axion
SEL Axion
SEL AxionSEL Axion
Substation Yard
Control House
This topology uses two CT/PT modules installed in one Axion node. The first
module maps to the W currents and Y voltages, and the second module maps to
the X currents and Z voltages.
Figure 2.44 Topology 2
VBZ
IAX, IBX, ICX
VAY, VBY, VCY
VAZ
IAW, IBW, ICW
Port
6A
Analogs
IAW, IBW, ICW, VAY, VBY, VCY
IAX, IBX, ICX, VAZ, VBZ, VCZ
SEL Axion
SEL Relay
Substation Yard
Control House