5-8
BE1-50/51B-235/-236 Testing
9252000898 Rev —
Instantaneous Overcurrent B (50-B) Pickup
1. Connect and configure the relay for 50-B pickup testing:
a. Connect the test setup shown in Figure 5-5.
b. Set circuit board switch SW3 as follows:
SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (Westinghouse/ABB type characteristic curves)
SW3-4 = ON (integrating reset characteristic)
c. Set TIME DIAL to 0.0.
d. Set CURVE to S.
e. Set TIME PICKUP to 3.18.
f.
Set INST PICKUP (50-A) to 18.0.
g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to 20 (0.4 Aac).
2. Apply and slowly increase current to terminals 8 and 9 until the 50-B output contacts close. The
applied current should be between 0.387 and 0.413 Aac.
3. Decrease the applied current until the 50-B output contacts open.
4. Set INST PICKUP (50-B) to 80 (1.6 Aac).
5. Slowly increase the current applied to terminals 8 and 9 until the 50-B output contacts close. The
applied current should be between 1.563 and 1.637 Aac.
6. Reduce the applied current to zero.
Figure 5-5. 50-B Pickup Test Setup
Target Indicators
1. Connect and configure the relay for target indicator testing:
a. Connect the test setup shown in Figure 5-6.
b. Set circuit board switch SW3 as follows:
SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (Westinghouse/ABB type characteristic curves)
SW3-4 = ON (integrating reset characteristic)
c. Set TIME DIAL to 0.0.
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