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ADE9078ACPZ 数据表(PDF) 59 Page - Analog Devices |
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ADE9078ACPZ 数据表(HTML) 59 Page - Analog Devices |
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59 / 108 page  ADE9078 Data Sheet Rev. 0 | Page 58 of 107 NON-BLONDEL COMPLIANT METERS Blondel’s theorem states that there must be n − 1 measuring elements in a meter, where n is the number of the wires of the electric system. In this way, a Blondel compliant 4-wire wye or 4-wire delta measures three voltages and three currents. In a 3-wire delta service, at least two voltages and two currents must be measured to be Blondel compliant. IEC meter forms are all Blondel compliant. ANSI has some meter forms that are not Blondel compliant, meaning that there are fewer than n − 1 elements, so that in a 4-wire wye or 4-wire delta configuration, two voltages and three currents are measured. The ADE9078 has provisions to deal with non-Blondel compliant meter forms. Use the VCONSEL bits in the ACCMODE register to select what calculation to use for VB based on the VA and VC signals. Table 23. Non-Blondel Compliant Meter Forms Service Type Non-Blondel Compliant ANSI Meter Form VCONSEL VB Calculation 4-Wire Wye, Two Voltages, Three Currents 6S, 7S, 14S, 29S, 36S, 46S, 76S 010 VB = −VA − VC 4-Wire Delta, Two Voltages, Three Currents 8S, 15S, 24S 011 VB = −VA APPLYING THE ADE9078 TO A 4-WIRE WYE SERVICE For the highest level of performance when measuring a 4-wire wye service, connect the neutral to ground, as shown in Figure 89. For this configuration, VCONSEL = 000. VAP VBP VCP VAN AGND DGND NEUTRAL VBN VCN VBN VB 220V –120° –120° 0.353V 220V 120° 120° 0.353V PHASE C VCN VC PHASE A PHASE B VAN VA 220V 0° 220V –120° 220V 120° PHASE C PHASE A PHASE B 220V 0° 0.353V 0° VCONSEL = 000 VA, VB, VC Figure 89. 4-Wire Wye, Neutral Connected to Ground Alternatively, a series impedance can be used on the neutral, as shown in Figure 90, which can be advantageous if an isolated power supply is used. Note that this configuration has poor performance if the phase voltages are not balanced. For more information, see the AN-1334 Application Note. For this configuration, VCONSEL = 000. NEUTRAL VAP VBP VCP VAN AGND DGND VBN VCN VBN VB 220V –120° –120° 0.353V 220V 120° 120° 0.353V PHASE C VCN VC PHASE A PHASE B VA 220V 0° 220V –120° 220V 120° PHASE C PHASE A PHASE B 220V 0° 0.353V 0° VCONSEL = 000 VA, VB, VC NEUTRAL ATTENUATION NETWORK Figure 90. 4-Wire Wye, Series Impedance on the Neutral Phase sequence error detection is performed based on the expected ABC sequence (see the Phase Sequence Error Detection section for more information). To calculate the overall power consumed by the system (active, reactive, and apparent), add the contribution from the Phase A, Phase B, and Phase C accumulations. |
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