Sel 421 - Figure 6.4 Test Connections Using Two Current Sources for Three-Phase Faults

U.6.11
Date Code 20090715 User’s Guide SEL-421 Relay
Testing and Troubleshooting
Relay Test Connections
Figure 6.4 Test Connections Using Two Current Sources for Three-Phase
Faults
Connections for Three Voltage Sources and One Current Source
Figure 6.5 and Figure 6.6 show connections to use when you have three
voltage sources and a single current source. You can use the connections
shown in Figure 6.5 to simulate phase-to-ground faults. Use the connections
shown in Figure 6.6 to simulate phase-to-phase faults.
Three-Phase
Voltage and Current
Test Sources
IA
VB
IB
VC
IC
VA
IAW
Z01 Z02 Z03 Z04 Z05 Z06
Z13 Z14 Z15 Z16 Z17 Z18
IBW ICW
VAY VBY VCY
Relay Rear-Panel Analog
Voltage and Current Inputs
N
N
N
Courtesy of NationalSwitchgear.com