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10.3
Date Code 20081022
Instruction Manual
SEL-787 Relay
Testing and Troubleshooting
Commissioning Tests
Access the low-level test interface connectors by using the following
procedure.
The relay contains devices sensitive
to Electrostatic Discharge (ESD).
When working on the relay with the
front panel removed, work surfaces
and personnel must be properly
grounded or equipment damage may
result.
!
CAUTION
Step 1. Loosen the mounting screws and the ground screw on the back
and remove the back cover.
Step 2. Remove the 6 ACI board from Slot
Z
.
Step 3. Locate jumpers JMP1–JMP6 and change them from Pin 1–2
(normal position) to Pin 2–3 (low-level test position).
Step 4. Locate connector J2 and connect low-level signal connector
(e.g., ribbon cable connector of SEL-RTS Test System).
Step 5. Insert the 6 ACI board back in its Slot
Z
.
Step 6. Remove the 1 ACI/3 AVI board or 1 ACI board from Slot
E
.
Step 7. Locate jumper JMP1 and change it from Pin 1-2 (normal
position) to Pin 2-3 (low-level test position)
Step 8. Locate connector J3 and connect low-level signal connector
(e.g., ribbon cable connector of SEL-RTS Test System).
Step 9. Insert the board back into Slot
E
.
Refer to the SEL
-RTS Instruction Manual
for additional detail.
When simulating a delta PT connection, DELTA_Y := DELTA, with the low-
level test interface referenced in
, apply the following signals:
➤
Apply low-level test signal VAB to Pin VA.
➤
Apply low-level test signal –VBC (equivalent to VCB) to
Pin VC.
➤
Do not apply any signal to pin VB.
Commissioning
Tests
SEL performs a complete functional check and calibration of each SEL-787
before it is shipped. This helps to ensure that you receive a relay that operates
correctly and accurately. Commissioning tests confirm that the relay is
properly connected including the control signal inputs and outputs.
The following connection tests help you enter settings into the SEL-787 and
verify that the relay is properly connected. Brief functional tests ensure that
the relay settings are correct. It is unnecessary to test every element, timer, and
function in these tests. Modify the procedure as necessary to conform to your
standard practices. Use the procedure at initial relay installation; you should
not need to repeat it unless major changes are made to the relay electrical
connections.
Required Equipment
➤
The SEL-787, installed and connected according to your
protection design
➤
A PC with serial port, terminal emulation software, and serial
communications cable
➤
with settings appropriate to your
application and protection design
NOTE:
The 14-pin connectors of the
SEL-RTS ribbon cable C750A can be
used. The connectors are not keyed;
make sure Pin 1 is connected to the
IAW1/VA channel on the 6 ACI and
1 ACI/3 AVI boards, respectively.
Summary of Contents for SEL-787
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