Neutral defeat test, Timed output test – Basler Electric BE1-51 User Manual
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9137200997 Rev G
RESULT: The recorded value should be within
±5% of the front panel TAP (NEUTRAL)
selector J setting for the neutral maximum overcurrent pickup point for the time overcurrent
element.
Neutral Defeat Test
Step 1. Perform the preliminary instructions.
Step 2. Set the front panel NEUTRAL TAP selector to A.
Step 3. Set the front panel NEUTRAL TIME DIAL selector to 00.
Step 4. Apply two times (200%) input current of tap A to neutral terminals and allow relay to time out
(trip).
Step 5. Set the front panel NEUTRAL DEFEAT switch to ON (up).
RESULT:
(1) NEUTRAL DEFEAT LED illuminates.
(2) NEUTRAL TIMING LED extinguishes.
(3) Output relay opens (closes if NC).
Step 6. Set the front panel NEUTRAL DEFEAT switch to OFF (down).
RESULT:
(1) NEUTRAL DEFEAT LED extinguishes.
(2) NEUTRAL TIMING LED illuminates.
(3) Output relay closes (opens if NC) after appropriate time delay.
Step 7. Remove input current.
Timed Output Test
This test checks the accuracy of the time overcurrent characteristic delay.
Note
For relays having three-phase sensing (Sensing Input Type G or V),
only a single input phase needs to be connected, since this is
sufficient for a complete test of the Time Delay. For relays that include
neutral sensing (Sensing Input Type H, I, V, or X) this test includes
reconnecting the Test Output to the Neutral Sensing terminals for
testing the Timed Output during neutral sensing.
Step 1.
Verify that the preliminary instructions have been performed.
Step 2.
(Timing type Z1, Z2, or Z3 only.) Select the desired time current characteristic curve.
Step 3.
Set the front panel TAP selector to B.
Step 4.
Adjust the front panel TIME DIAL to 20.
Step 5.
Adjust the test set for an overcurrent threshold of precisely 5 times the front panel TAP selector
B setting.
Step 6.
Apply input current to the relay and initiate the test setup timer.
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:
Tests and Adjustments
BE1-51