U.4.36
SEL-421 Relay User’s Guide Date Code 20090715
Basic Relay Operations
Examining Metering Quantities
Figure 4.26 Test Connections Using Two Current Sources for Three-Phase
Faults and MET ER Test
Step 7. Turn the relay power on.
Step 8. View metering.
a. Type ACC <Enter> to log-in to relay Access Level 1.
b. Type your password and press <Enter>.
c. Type MET <Enter>.
The relay displays the fundamental frequency (50 Hz or
60 Hz) metering information in a manner similar to that
in Figure 4.27.
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
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