Schweitzer Engineering Laboratories SEL-421-4 - Figure 3.3 Test Connections Using Two Current Sources for Phase-To-Phase, Phase-To-Ground, and Two-Phase-To-Ground Faults

3.5
Date Code 20171021 Instruction Manual SEL-421 Relay
Testing
Relay Test Connections
Connections for Three Voltage Sources and Two Current Sources
Figure 3.3 and Figure 3.4 show connections to use when you have three voltage
sources and two current sources. You can use the connections shown in
Figure 3.3 to simulate phase-to-phase, phase-to-ground, and two-phase-to-
ground faults. Use the connections shown in Figure 3.4 to simulate three-phase
faults.
Figure 3.3 Test Connections Using Two Current Sources for Phase-to-Phase,
Phase-to-Ground, and Two-Phase-to-Ground 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 Secondary
Voltage and Current Inputs
N
N
N