ADE9078 datasheet(61/108 Pages) AD

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ADE9078

Data Sheet

Rev. 0 | Page 60 of 107

VBC 220V

90°

0.353V

90°

VBA 220V

30°

0.353V

30°

VAC 220V

150°

0.353V

150°

VCONSEL[2:0] = 100

CALCULATED VA, VB, VC

VAP

VBP

VCP

VAN

AGND

DGND

VBN

VCN

220V

–120°

220V

120°

PHASE A

PHASE B

220V

0°

Figure 93. 3-Wire Delta, Series Impedance on Phase B and VCONSEL = 100

The VA, VB, and VC waveforms computed inside the ADE9078

for the 3-wire delta with series impedance on Phase B and

VCONSEL = 100 are shown in the time domain in Figure 93

and correspond to the phasor diagram shown in Figure 92.

Phase sequence error detection is performed with the

expectation that the VC waveform leads VA (see the Phase

Sequence Error Detection section for more information).

In a Blondel compliant 3-wire delta meter, only the overall

power consumed by the system is meaningful; the individual

phase powers are not meaningful because a line current is

multiplied by a line to line voltage. To calculate the overall

power consumed by the system (active, reactive, and apparent),

add the contribution from Phase A and Phase C.

APPLYING THE ADE9078 TO A NON-BLONDEL

COMPLIANT, 4-WIRE WYE SERVICE

To use the ADE9078 in a non-Blondel compliant 4-wire wye

service, such as for ANSI Meter Forms 6S, 7S, 14S, 29S, 36S,

46S, 76S, the Phase A and Phase C voltages are measured and

the Phase B voltage is calculated, VB = VA − VC. All three phase

currents are measured. For this configuration, write

VCONSEL = 010 and connect as shown in Figure 94.

VAP

VBP

VCP

VAN

AGND

DGND

NEUTRAL

VBN

VCN

VBN

220V

–120°

0.353V

220V

120°

0.353V

PHASE C

VCN

PHASE A

PHASE B

VAN

220V

0°

220V

–120°

220V

120°

PHASE C

PHASE A

PHASE B

220V

0°

0.353V

0°

VCONSEL = 010

VA, VB, VC

Figure 94. Non-Blondel Compliant 4-Wire Wye

The phasor diagram follows Figure 83. 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 total power (active, reactive, and apparent), add

the contribution from Phase A, Phase B, and Phase C.

APPLYING THE ADE9078 TO A NON-BLONDEL

COMPLIANT, 4-WIRE DELTA SERVICE

To use the ADE9078 in a non-Blondel compliant 4-wire delta

service, such as for ANSI Meter Forms 8S, 15S, and 24S, measure

the Phase A and Phase C voltages and calculate the Phase B

voltage, VB = −VA. All three phase currents are measured. For

this configuration, write VCONSEL = 011 in the ACCMODE

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