11-38 Testing and Troubleshooting Date Code 20010731
SEL-352-1, -2 Instruction Manual
5. For each test, the relay generated a sequential events record for the elements
programmed in Step 1. View the SER using the SER command. The RTpu time
should be the time between assertion of TRIPA and assertion of RTA.
6. Repeat Steps 3, 4, and 5 for B-phase and C-phase.
LOCKOUT RELAY CONTROL, SCHEME 1 LOGIC TEST
Purpose: Verify Scheme 1 operation of the lockout relay control logic (Reference: Figure 4.12
and Figure 4.13).
Method: 1. While the relay can use two different lockout relay control schemes, only one is
enabled at a time. Select Scheme 1 by setting TRLOG = 1 in the relay setting
group. Using the SET command, set one output to close when the 86BFT element
asserts and another output contact to close when the 86RS element asserts. Set the
SER to trigger for the listed elements. Verify the settings with the SHO and the
SHO G command.
Setting
Elements
TRLOG, LDLOG,
M86T, 50MD,
M2pu, 52AA,
TRIPA, 86BFT,
86RS, CTF, TTF
LBF, 86BFT, 86RS, 52AA, 50MD, M86T,
TRIPA, CTF, TTF
2. Enable Scheme 2 of the failure-to-trip load current logic using SET LDLOG.
Save the settings. This logic sets the LBF bit based on the breaker status and the
TRIPA input.
3. Connect an external timer, and set it to start when the output contact programmed
in Step 1 for 86BFT closes and stop when the output opens.
4. Assert the 52AA input by applying dc control voltage to the assigned input
terminals.
5. Assert the TRIPA input. This action starts the relay AFpu timer of the failure to
trip load logic.
6. Shortly after TRIPA input assertion, the 86BFT output should close, indicating
LBF bit assertion. This action should start the external timer.
7. Deassert the TRIPA input.
8. M2pu cycles after the 86BFT output asserts, it should deassert, stopping the timer.
The timer reading should be approximately equal to the M2pu timer setting.
9. Reconnect the timer to stop when the programmable output contact set to indicate
86RS closes.
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