Date Code 20010731 Testing and Troubleshooting 11-33
SEL-352-1, -2 Instruction Manual
7. Record the time from Step 6. This time should be close to the L2pu timer setting.
8. Reconnect the timer to start when dc control voltage is applied to the LODCT
input and stop when the output contact programmed for LODPF closes.
9. Assert the LODCT input by applying dc control voltage to the assigned input
terminals. Verify that the output contact programmed for LODPF in Step 1
closes.
10. Record the time from Step 6. This time should be close to one second.
11. Optional. LOD1 and LOD2 block assertion of LODPF and LODBF, respectively,
once their corresponding timers pick up. Verify this by applying control voltage
to these inputs to block the output.
12. For each test, the relay generated a sequential events record for the elements
programmed in Step 1. View the SER using the SER command. Observe the
times between the assertion of the inputs (LOD1, LOD2, and LODCT) and
assertion of the corresponding outputs (LODBF and LODPF).
STAGGERED CLOSE LOGIC TEST
Purpose: Verify the staggered close logic (Reference: Figure 4.1).
Method: 1. While the relay can use two different closing schemes, only one is enabled at a
time. Select Scheme 1 by setting CLSLOG = 1 in the relay setting group. Using
the SET command, set an output to close when the CCA element asserts, and set
the SER to trigger for the listed elements. It is recommended that one of the Fast
High Current Interrupting Output contacts is used for accurate timing. Refer to
Interface Board 5 specified in Section 2: Installation. Verify the settings with the
SHO and SHO G command.
Setting
Elements
CLSLOG,
RCApu, CLSdo,
CLOSE,
MCLOSE
CLOSE, MCLOSE, CCA
2. Connect an external timer and set it to start when you assert the CLOSE or
MCLOSE assigned input and stop when the programmable output you set in
Step 1 closes.
3. Apply dc control voltage to the input assigned to CLOSE.
4. Verify that the timer reading is approximately the RCApu timer setting.
5. Connect an external timer, and set it to start when the programmable output you
set in Step 1 closes and stop when the output opens.
6. Apply dc control voltage to the input assigned to CLOSE.
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