Sel 421 - Figure 6.2 Test Connections Using Three Voltage and Three Current Sources

U.6.9
Date Code 20090715 User’s Guide SEL-421 Relay
Testing and Troubleshooting
Relay Test Connections
Figure 6.2 Test Connections Using Three Voltage and Three Current Sources
Connections for Three Voltage Sources and Two Current Sources
Figure 6.3 and Figure 6.4 show connections to use when you have three
voltage sources and two current sources. You can use the connections shown
in Figure 6.3 to simulate phase-to-phase, phase-to-ground, and two-phase-to-
ground faults. Use the connections shown in Figure 6.4 to simulate three-
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