5-6
BE1-51 Tests and Adjustments
9137200997 Rev D
(b) The appropriate front panel
ELEMENT
target
A
,
B
, or
C
(if present)
trips.
Step 8.
Remove input current and (if present) reset the relay front panel targets.
Step 9. On the appropriate time overcurrent curve chart (Figures A-1 through A-69), locate the line
representing 5 times the tap value (from Step 5) where it intersects the particular curve
representing the front panel
TIME DIAL
setting of
20
(from Step 4). The resulting time delay
value in seconds should be within
±
5% of the timer reading [from Step 7(2)].
Step 10. Adjust the front panel
TIME DIAL
to
40
,
60
, and
99
, each time repeating Steps 6 through 9.
Step 11. Remove the power and reconnect the test output to the neutral current sensing input of the
relay as shown in Figures 5-3 and 5-4 (terminals 17 and 18).
Step 12. Set the front panel
TAP (NEUTRAL)
selector to
B
.
Step 13. Rotate the front panel
CAL (NEUTRAL)
control fully CW.
Step 14. Rotate the front panel
TIME DIAL (NEUTRAL)
to
20
.
Step 15. Ensure that all relay targets have been reset.
Step 16. Adjust the test set for an overcurrent threshold of precisely 5 times the front panel
TAP
(NEUTRAL)
selector
B
setting as measured by the ammeter.
Step 17. Apply input current to the relay and initiate the test setup timer.
RESULTS:
Observe that the appropriate front panel
TIMING (NEUTRAL)
indicator illuminates.
Step 18. When the time delay ends, the timed output relay is energized.
RESULTS:
(1) The front panel
TIMING (NEUTRAL)
indicator extinguishes.
(2) The test setup timer stops. (Record count for use in Step 20.)
(3) If target Type A or B is present:
(a)
Front
panel
FUNCTION-TIME
target (if present) trips.
(b) Appropriate front panel
ELEMENT
target
A
,
B
, or
C
(if present) trips.
Step 19. Remove input current and (if present) reset the relay front panel targets.
Step 20. On the appropriate time overcurrent curve chart (Figures A-1 through A-69), locate the line
representing 5 times the tap value (from Step 5) where it intersects the particular curve
representing the front panel
TIME DIAL (NEUTRAL)
setting of
20
(from Step 14). The resulting
time delay value in seconds should be within
±
5% of the timer reading [from step 18(2)].
NOTE
Due to delays inherent in the test equipment, the time delay for the following test
may appear to exceed these limits.
NOTE
For relays having two-phase-and-neutral, three-phase, or three-phase-and-
neutral sensing (Sensing Input Types G, H, I, V, or X) it is not necessary to
repeat this test for the remaining phases.
For relays having two-phase-and-neutral, or three-phase-and-neutral sensing
(Sensing Input Types H, I, V, or X) perform Steps 11 through 20.
For relays having single-phase or three-phase sensing (Sensing Input Types G
or K) with instantaneous overcurrent option 1-1 or 1-2, proceed to the
instantaneous overcurrent test.