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Date Code 20020129
Testing and Troubleshooting
10-21
SEL-387E Instruction Manual
Change the angle of IAW1 to zero degrees, or any value within about ±80
degrees of IAW3. The REF element should function. Verify this as
follows:
Execute
the
TAR 21
command again. 50G3 should still be 1, REFP
should be 1 (indicating time out), 32IR should be 0, and 32IF should be 1
(indicating an internal, or forward, fault).
Step 4.
Purpose: Verify the operation time.
Method: Type
SER<ENTER>
to view the SER records. The assertion and
deassertion of each element listed in the SER1, 2, 3, and 4 settings is
recorded. Subtract the time of assertion of the directional element (32IF)
from the assertion time of the time-out bit (REFP). This is the operate
time, which should be about one second, as calculated above. (50G3 will
have remained asserted from earlier in the test, since no change was made
to the IAW3 current.)
SER C
clears the SER records.
Differential
The SEL-387E Relay has several components to its differential element. Figure 10.7 gives a
representation of the differential characteristic and the plot of each test. Each test only uses
Winding 1 and 2 inputs. Any combination of two winding inputs may be used for the test. The
differential elements for each winding must be enabled for each winding under test with the
E87W1, E87W2, and E87W3 settings. Set each setting equal to “Y” to enable the corresponding
differential element.
Figure 10.7: Percentage Restraint Differential Characteristic
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