BE1-46N Testing
5-3
NOTE
Relay power must be cycled OFF and ON between each timing test to ensure that the
reset time has been defeated.
t
K
(I
2
pu)
2
t
10
(0.5)
2
40 seconds
Figure 5-1. Test Setup Diagram
Step 4. Observe timer reading after PICKUP LED lights.
RESULT:
Timer should indicate 40 ±2 seconds.
Step 5. To calculate the time required for the timing function, use the following formula:
Substituting in the formula:
MAX TIME
The following procedure will show how the MAX Time affects relay timing.
Step 1. Connect the test circuit shown in the test setup diagram, Figure 5-1, set the TAP ADJUST switch
to A position, and CAL control fully CW.
Step 2. Adjust current source to apply 2.4 A (25% I
2
or 0.25 pu) to the phase A input and set the front panel
controls as follows:
&
PICKUP and ALARM to 05.
&
K-SET to 10.
&
MAX TIME to 10.
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