Schweitzer Engineering Laboratories SEL-421-4 - Figure 3.5 Test Connections Using a Single Current Source for a Phase-To-Ground Fault

3.7
Date Code 20171021 Instruction Manual SEL-421 Relay
Testing
Relay Test Connections
Connections for Three Voltage Sources and One Current Source
Figure 3.5 and Figure 3.6 show connections to use when you have three voltage
sources and a single current source. You can use the connections shown in
Figure 3.5 to simulate phase-to-ground faults. Use the connections shown in
Figure 3.6 to simulate phase-to-phase faults.
Figure 3.5 Test Connections Using a Single Current Source for a Phase-to-
Ground Fault
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 Secondary
Voltage and Current Inputs
N
N
N