5-14
BE1-87T Test Procedures
9171300990 Rev R
VERIFICATION TESTS: 1 AMP CT, 50 OR 60 HZ UNITS
CAUTION
Current supplied to the BE1-87T input terminals must not exceed 4 A continuous or 50 A
for 1 second. Whenever 4 A must be exceeded, provisions must be made to cut off the
sensing current automatically after a suitable time interval. This can be calculated by
using the following equation:
I
K
t
=
Where: K = 50 or 50 x tap, whichever is less
t = the time (in seconds) that the current flows
Restrained Pickup Verification
Step 1.
Connect the relay as appropriate (refer to Figures 5-2 through 5-5) beginning with input
terminals 11 and 13 for the initial tests. Do not apply power at this time.
Step 2.
Observing
the
precautions provided in Section 4,
RELAY DISASSEMBLY
, remove the relay
from its case. Then remove the front panel to gain access to the printed circuit boards.
Step 3.
Remove the Analog #1 board (one per phase) shown in Figure 4-19. Connect the Input-
Grounding jumpers to the disabled position. Refer to Figure 4-20 for relays with Option 1-0 and
Figure 4-21 for relays with Option 1-1 for correct positioning. For further information, see
Grounding Unused Inputs
in Section 4.
After testing is complete (and prior to placing the relay in service), it may be necessary to
reposition the jumpers.
Step 4.
Three-Phase Units Only:
Check that all of the 30° Phase Shift Compensation jumpers on the
Analog Board #2, shown in Figure 4-27, are in the
WYE
position. If not, reposition these
jumpers accordingly.
NOTE
It is possible to test three-phase units without changing the 30° Phase Shift
Compensation jumpers from the in-service positions. Refer to
Testing Three-Phase
Relays without Changing Jumpers
at the end of this section.
Step 5.
Replace all circuit boards and reassemble the relay.
Step 6.
Refer to Table 1-1 and Figure 1-2 for multiples of tap and percentage restraint characteristics.
Set the
RESTRAINED PICKUP LEVEL
switches and the
INPUT 1
and
INPUT 2
tap switches
to the values shown in Table 5-5.
Step 7.
Apply power to the relay. Apply input current as indicated in Table 5-5 for each input. Then
reduce the Input 2 current or increase the Input 1 current until the
REST. TRIP
LED lights. This
should occur as the input current being adjusted reaches the level given in the Trip Amperes
column for the respective input.
Step 8.
If the relay has more than two inputs, reconnect the relay by substituting the Input 3 terminals
for the Input 2 terminals. Then repeat step 6 and 7 using the Input 2 values of Table 5-5 for
Input 3.
If there are more than three inputs (as in some single-phase units), continue substituting every
higher-numbered input for Input 2, each time comparing the input under test against Input 1 as
in Steps 6 and 7.
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