9252000897 Rev A
BE1-50/51B-233 Testing
5-5
Step 1. Set target current source to 1.0 ampere, ac.
Step 2. Apply 0.9 ampere input current to terminals 8 and 9. (0.9 ampere provides input power but stays
below pickup.)
Step 3. Connect a jumper between TIME MANUAL TRIP test points. Check that TIME target operates.
Step 4. Connect a jumper between INST MANUAL TRIP test points. Check that INST target operates.
Step 5. Reset targets.
Integrating Reset Test
Perform preliminary setup:
•
Connect test setup as shown in Figure 5-1.
•
Insure that SW3 switches are set: SW3-1 to OFF, SW3-2 to OFF, SW3-3 to ON, and SW3-4 ON.
•
Set TIME DIAL to 9.9.
•
Set CURVE to V.
•
Set TIME PICKUP to 1.0.
•
Set INST PICKUP to 90.
Step 1. Set target current source to 1.0 ampere, ac.
Step 2. Read all of Step 3 before beginning Step 3.
Step 3. Apply 4.0 amperes input current to terminals 8 and 9. After the unit trips, remove the input current
for 29 ±0.25 seconds, then reapply the 4.0 amperes input current. Record the elapsed time from
the re-application of input current to the output retrip.
Result:
Elapsed time should be 2.08 ±0.4 seconds.
SETTING THE RELAY
Select the desired relay settings before putting the relay into service. Changing pickup current settings
while the relay is in service may cause tripping.
PERIODIC TESTS
General
All relays should be tested periodically to identify and correct any problems that are found.
Single phase relays such as the BE1-50/51B-233 are normally used in groups of four (three phase and
ground) on the protected circuit. This relay scheme allows each unit to be withdrawn one at a time for
testing purposes without losing protection. Only three are required at any one time to sense all types of
faults on a grounded wye system. Refer to Figures 5-1 and 5-2 for recommended test setups.
Periodic Test
Periodic testing should consist of the following procedures.
Step 1. Verify that the instantaneous pickup is within ±2% of the value set on the dials. Pickup occurs
when the INST output contacts close.
Step 2. Verify that the time pickup is within ±2% of the value set on the dials. Pickup occurs when the
LED turns GREEN then RED.
Step 3. Verify that the time to trip for the curve and time dial settings at a multiple of six is the same as
the time given on the characteristic curve. Refer to Section 1 for the characteristics curves.
Step 4. Verify that the time to trip for the instantaneous element at a pickup multiple of 2 is not greater
than the time given on the instantaneous characteristic curve. Refer to Section 1 for the
instantaneous characteristic curve.
CAUTION
Trip circuit voltage is present at the front panel test points. When shorting the test
points, use insulated jumpers to avoid contact with these voltages.
Summary of Contents for BE1-50/51B-233
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