3-2 BE1-32R, BE1-32O/U Functional Description 9171100990 Rev R
Type E Sensing
Relays with type E sensing (two elements) monitor two phase-to-phase voltages (the third phase is used
as a reference) and two phases of current to determine directional power flow. This is sometimes referred
to as the two-wattmeter method for power flow measurement. Figure 3-2 shows the phasor
representation for ABC rotation. Figure 3-3 shows the phasor representation for ACB rotation.
Figure 3-2. Type E Sensing with ABC Rotation
Figure 3-3. Type E Sensing with ACB Rotation
Type B and V Sensing
Relays with type B sensing (60 hertz) and type V sensing (50 hertz) monitor one phase-to-phase voltage
and one phase of current to determine directional power flow. An internal 30-degree phase delay network
(frequency dependent) aligns the voltage signal with the current signal. Figure 3-4 shows the phasor
representation for monitoring A-phase to B-phase voltage and A-phase current with ABC rotation. Figure
3-5 shows the phasor representation for monitoring A-phase to C-phase voltage with ACB rotation.
Figure 3-4. Type B or V Sensing with ABC Rotation
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