Date Code 20010731
Testing and Troubleshooting
11-39
SEL-352-1, -2 Instruction Manual
10. Repeat Steps 4, 5, and 6. Approximately 5 seconds after the 86BFT output opens,
the 86RS bit should assert, causing the programmable output contact set in Step 1
to close, stopping the external timer.
11. Note the reading on the timer. Subtract the time recorded in Step 8 from the timer
reading. The difference should be approximately 5 seconds (M4 fixed timer).
12. Reconnect the timer to start when the programmable output contact set to indicate
86RS closes and stop when that contact opens.
13. Repeat Steps 4, 5, and 6. Approximately 5 seconds after the 86BF TRIP output
operates, the 86RS contact should close, then open.
14. Note the reading on the timer. The time recorded should be approximately 1
second (M1 fixed timer).
15. Optional. If you apply phase current above the 50MD setting before or while the
86BFT output is asserted, the relay delays deassertion of the 86BFT output and
assertion of the 86RS element. Also, if either the trip or close thermal elements
pickup (CTF, TTF) the 86RS element assertion will be delayed.
16. For each test, the relay generated a sequential events record for the elements
programmed in Step 1. View the SER using the
SER
command. Verify M1 (60
cycles) from the assertion of 86RS to the deassertion of 86RS. Verify M2pu from
the assertion of 86BFT to the deassertion of 86BFT. Verify M4 (300 cycles) from
the deassertion of 86BFT to the assertion of 86RS.
L
OCKOUT
R
ELAY
C
ONTROL
, S
CHEME
2 L
OGIC
T
EST
Purpose: Verify Scheme 2 operation of the lockout relay control logic (Reference: Figure 4.14
and Figure 4.15).
Method: 1. While the relay can use two different lockout relay control schemes, only one is
enabled at a time. Select Scheme 2 by setting TRLOG = 2 in the relay setting
group. Using the
SET
command, set one output to close when the 86BFT element
asserts, another output contact to close when MDT 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
commands.
Setting Elements
LDLOG, TRLOG,
M86T, 50LD,
50MD, M2pu,
M3pu, 52AA,
TRIPA, 86BFT,
86RS
LBF, 86BFT, 86RS, MDT, 52AA, 50LD, 50MD,
M86T, MODST, TRIPA
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.
Содержание SEL-352-1
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