BE1-32R, -32 O/U FUNCTIONAL DESCRIPTION
3-1
SECTION 3 • FUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTION
BE1-32R, -32 O/U Directional Power Relays are solid state devices that provide equipment protection for system
overpower, and/or underpower, or circuit supervisory control. A relay functional description is provided in the
following paragraphs. Refer to Figure 3-1 to follow the functional description.
Figure 3-1. Functional Block Diagram
Current Sensing
System current transformers (CTs) with nominal five ampere secondaries supply the directional power relay input
transformers with one or three-phase currents. If sensing input range 1, 4, or 7 is selected, the input
transformers are capable of 7 amperes continuous current, 10 amperes for one minute, and 140 amperes for
one second. If sensing input range 2, 3, 5, 6, 8, or 9 is selected, the input transformers are capable of 10
amperes continuous current, 15 amperes for 1 minute, and 200 amperes for one second. Refer to Table 3-1
for current sensing burden.
Voltage Sensing
System potential transformers (PTs) with 120/240 volt secondaries supply the directional power relay input
transformers with single or three-phase voltage. Voltage sensing inputs are nominally rated at 100/220 V (50
Hz) or 120/240 (60 Hz) with a maximum burden of one VA per input (2 terminals) over the frequency range of
45 to 65 Hz.
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