BE1-51/27C Tests and Adjustments
5-9
NOTE
Due to delays inherent in the test equipment, the time delay may appear to exceed
these limits. This concludes the timed output test.
Relays having instantaneous overcurrent option 1-1 or 1-2
only
proceed to the
Instantaneous Overcurrent Test. All other relays proceed to voltage control test.
NOTE
For relays having three-phase sensing (sensing input type A or P), only a single input
phase is connected since this is sufficient for a complete test of the instantaneous
overcurrent sensing and output.
For relays that include neutral sensing (sensing input types D, T, and J), this test
includes reconnecting the test output to the neutral sensing terminals for testing the
instantaneous 1 output during neutral sensing.
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 1-2 through 1-38), 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)].
Instantaneous Overcurrent Pickup Test
This test checks the minimum Overcurrent Pickup Points for Instantaneous 1 and (if present) Instantaneous
2 outputs.
Step 1. Perform the preliminary instructions.
Step 2. Reconnect the test setup to the INST 1 output terminals 2 and 10 as shown in Figures 5-1 through
5-6. Note that the timer may be removed from the test setup at this time.
Step 3. set the
TAP
selector to
A
.
Step 4. Turn the front panel
INST 1
control fully CCW to establish a pickup point of 1 times the
TAP
selector
A
setting.
Step 5. Slowly adjust the test set, increasing the overcurrent threshold toward the value of the front panel
TAP
selector
A
setting until the Instantaneous 1 output relay energizes). Do not disturb this
setting.
RESULT:
If the target Type A or B is present:
(a)
The front panel
FUNCTION - INST 1
target (if present) will trip.
(b)
The appropriate front panel
ELEMENT
target
A
,
B
, or
C
(if present) will trip.
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...