Sel 751A, Инструкция по эксплуатации

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10.3
Date Code 20100129 Instruction Manual SEL-751A Relay
Testing and Troubleshooting
Commissioning Tests
Step 8. Using the SET , SET P , SET G , SET L , and SET R serial port
commands, enter the relay settings from the settings sheets for
your application.
Step 9. If you are connecting an external SEL-2600 RTD Module,
follow the substeps below; otherwise continue with the next
step.
a. Connect the fiber-optic cable to the RTD Module fiber-
optic output.
b. Plug the relay end of the fiber-optic cable into the relay
fiber-optic input (Port 2).
Step 10. Verify the relay ac connections.
Step 11. Connect the ac test source current or voltage to the appropriate
relay terminals.
NOTE:
Make sure the current
transformer secondary windings are
shorted before they are disconnected
from the relay.
a. Disconnect the current transformer and voltage
transformer (if present) secondaries from the relay prior
to applying test source quantities.
b. If you set the relay to accept phase-to-ground voltages
(DELTA_Y := WYE), set the current and/or voltage
phase angles as shown in
Figure 10.1 .
c. If you set the relay to accept delta voltages
(DELTA_Y := DELTA), set the current and/or voltage
phase angles as shown in
Figure 10.2 .
Figure 10.1 Three-Phase Wye AC Connections
+120˚
–120˚
V
C
V
B
V
C
V
A
PHROT := ABC
+120˚
–120˚
PHROT := ACB
V
B
V
A
When setting PHROT := ABC, set angle V
A
= angle I
A
= 0˚
set angle V
B
= angle I
B
= —120˚
set angle V
C
= angle I
C
= 120˚
When setting PHROT := ACB, set angle V
A
= angle I
A
= 0˚
set angle V
B
= angle I
B
= 120˚
set angle V
C
= angle I
C
= —120˚