10.9
Date Code 20170814
Instruction Manual
SEL-700G Relay
Testing and Troubleshooting
Commissioning Tests
Step 21. Verify the following ac quantities by using the front-panel
METER > Fundamental
or serial port METER command.
➢
Phase current magnitudes should be nearly equal.
➢
Phase current angles should be balanced, have proper
phase rotation, and have the appropriate phase
relationship to the phase voltages.
Step 22. If your relay is equipped with voltage inputs, check the
following:
➢
Phase voltage magnitudes should be nearly equal.
➢
Phase voltage phase angles should be balanced and
have proper phase rotation.
The SEL-700G is now ready for continuous service.
Functional Tests
Phase Current Measuring Accuracy
Step 1. Connect the current source to the relay, as shown in
Figure 10.5
CTRX Current Source Connections
Step 2. Using the front-panel
SET/SHOW
or the serial port SHO
command; record the CTRX and PHROT setting values.
Step 3. Set the phase current angles to apply balanced three-phase
currents in accordance with the PHROT setting. Refer to
Figure 10.3.
Step 4. Set each phase current magnitude equal to the values listed in
Column 1 of Table 10.4. Use the front panel to view the phase
current values. The relay should display the applied current
magnitude times the CTRX setting.
Table 10.4
CTRX Phase Current Measuring Accuracy
a
a
The displayed quantities are model dependent.
|I| Applied
(A secondary)
b
b
I
XNOM
= rated secondary amps (1 or 5).
Expected
Reading
CTRX x |I|
A–Phase
Reading
(A primary)
B–Phase
Reading
(A primary)
C–Phase
Reading
(A primary)
0.2 • I
XNOM
0.9 • I
XNOM
2.0 • I
XNOM
SEL-700G
Current
Test
Source
IA
IB
IC
ICX
IBX
IAX
IN
Z01
Z02
Z03
Z04
Z05
Z06
Summary of Contents for SEL-700G Series
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