Basler BE1-67, Instruction Manual, Page: 69 / 73

5-12 Testing BE1-67
Figure 5-13. Limited Region Of
Operation Setting
Refer to Figure 5-13.
Where:
Phase
I
= phase of the applied current relative to the applied voltage
$
= desired LIMITED REGION OF OPERATION setting
+ angle = leading current
- angle = lagging current
Step 5. Slowly rotate the LIMITED REGION OF
OPERATION control CCW until the INHIBIT LED
just illuminates.
Verifying Relay Settings
A verification of the directional setting should now be
performed.
Step 6. Vary the applied current phase angle through 360°
and record the angle values at which the
appropriate phase INHIBIT LED turns ON and
OFF. Plot the results on a polar coordinate graph
for future reference.
SETTING THE RELAY - AN EXAMPLE
One method of setting the relay is described here. There are other methods that may be used as well. All
methods involve similar steps and equipment.
Example Defined
Before the relay can be set, the required settings need to be defined. A typical example follows.
Time overcurrent pickup: 5.7 A
Curve shape: Very inverse
Time delay setting: 0.6 second at 28.5 A
Instantaneous overcurrent pickup: 39.9 A
Line impedance angle: 60°
Limited range of operation: B = 45°
The relay that has been selected for this application is a BE1-67, style number B1E-Z2Y-B1N6F.
Before applying sensing inputs to the relay, a few adjustments are necessary.
Step 1. Since the relay includes the Z2 timing option, the characteristic curve needs to be selected. This
is accomplished by removing the front panel and adjusting the TIME OVERCURRENT
CHARACTERISTIC CURVE SELECTOR switch to position 6. (See Very Inverse, Table 1-4.)
Step 2. Because the time overcurrent pickup is 5.7 amperes, the sensing current input for the relay will
need to be connected for the HIGH range. Adjust the TAP RANGE plate on the front panel to
display the word HIGH. Verify that the current connections to the relay are on terminals 7 and 8
(phase A), 14 and 15 (phase B), and 17 and 18 (phase C). Terminals 9, 13 and 16 should not be
connected.
Step 3. Calculate the ratio of the instantaneous overcurrent pickup setting to the time overcurrent pickup
setting.
In this example, the ratio is 39.9 ÷ 5.7 = 7. (This ratio is used in Step 2, Setting The Pickups .)