BE1-51/27C Tests and Adjustments
5-8
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 inputs types A, D, P, T, and J) 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 type D, T, and J) perform Steps 11 through 20.
For relays having single-phase or three-phase sensing (sensing input types A and
P)with instantaneous overcurrent option 1-1 or 1-2, proceed to the instantaneous
overcurrent test. All other relays proceed to the voltage control test.
Step 7. Observe that the appropriate front panel
TIMING
indicator illuminates and when the time delay
ends that the timed output relay is energized.
RESULTS:
(1) The appropriate front panel
TIMING
indicator extinguishes.
(2) The test setup timer stops. (Record count for use in Step 9.)
(3) If target type A or B is present:
(a) The front panel
FUNCTION-TIME
target (if present) trips.
(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 1-2 through 1-70), 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 5-5 (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.
Summary of Contents for BE-51/27C
Page 1: ...0 1 2 3 4 5 67869 ABC DEF G 6H II GGJ KL M DEF DEK...
Page 16: ...BE1 51 27C Controls and Indicators 2 2 Figure 2 1 Location of Controls and Indicators...
Page 20: ...BE1 51 27C Controls and Indicators 2 6...
Page 22: ...BE1 51 27C Functional Description 3 2 Figure 3 2 Functional Block Diagram...
Page 32: ...BE1 51 27C Installation 4 7 Figure 4 10 Typical Internal Diagram Sensing Input Type L...
