1-6
BE1-87T General Information
9171300990 Rev R
Table 1-1. Multiples of Tap
Front
Panel
Setting
%
15
20
25 30 35 40 45 50 55 60
Maximum Restraint
Current At Minimum
Pickup In Multiples of
Tap
2.33 1.75 1.40
1.17
1.00
0.875
0.778
0.700 0.636 0.583
Figure 1-2. Percentage Restraint Characteristic
Second-Harmonic Restraint
Inhibit of the restrained output occurs when the second-
harmonic component exceeds a pickup setting, which is
internally adjustable over the range of 8 % to 15 % of the
operating current for single-phase Units or 11 to 27 % for
three-phase units. The factory setting is 12 % for single-
phase units and 18 % for three-phase units.
Fifth-Harmonic Restraint
Inhibit of the restrained output occurs when the fifth-harmonic
component exceeds a pickup setting which has an internally
adjustable range of 25 to 45 % of the operating current. The
factory setting is 35 %.
Unrestrained Output
Pickup Range
Front panel thumbwheel switches adjust the pickup point of
the unrestrained output over a range of 6 to 21 times the tap
setting in increments of 1 x Tap.
Pickup Accuracy
±3 % of the front panel setting.
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