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5 Annex. Meter Forms
The service type determines what meter form is being implemented and how the Metrology DSP core interprets and processes the ADC values.
5.2 Service Type 1 – 3P4WD_3E_3V3I
Metering form 3-Phase 4-Wire DELTA, 3-Elements, 3-Voltages, 3-Currents

Introduction
1 Definitions, Acronyms and Abbreviations
2 Overall Description
3 Metrology Interface Definition
4 Interface between Metrology and Application
5 Annex. Meter Forms
The service type determines what meter form is being implemented and how the Metrology DSP core interprets and processes the ADC values.
- 5.1 Service Type 0 – 3P4WY_3E_3V3I
  Metering form 3-Phase 4-Wire WYE, 3-Elements, 3-Voltages, 3-Currents
- 5.2 Service Type 1 – 3P4WD_3E_3V3I
  Metering form 3-Phase 4-Wire DELTA, 3-Elements, 3-Voltages, 3-Currents
- 5.3 Service Type 2 – 3P4WY_2.5E_2V3I
  Meter form 3-Phase 3-Wire WYE, 2½-Elements, 2-Voltages, 3-Currents
- 5.4 Service Type 3 – 3P4WD_2E_3V2I
  3-Phase 4-Wire DELTA, 2-Elements, 3-Voltages, 2-Currents
- 5.5 Service Type 4 – 3P3WD_2E_2V2I
  3-Phase 3-Wire DELTA, 3-Elements, 2-Voltages, 2-Currents
- 5.6 Service Type 5 – 2P3W_2E_2V2I
  2-Phase 3-Wire NETWORK, 2-Elements, 2-Voltages, 2-Currents
- 5.7 Service Type 6 – 1P3W_1.5E_1V2I
  1-Phase 3-Wire, 1½-Elements, 1-Voltage, 2-Currents
- 5.8 Service Type 7 – 1P2W_1E_1V1I
  1-Phase 2-Wire, 1-Element, 1-Voltage, 1-Current
- 5.9 Service Type 8 – 1P3W_1E_2V1I
  1-Phase 3-Wire, 1-Element, 2-Voltages, 1-Current
6 References
7 Revision History
Microchip Information

5.2 Service Type 1 – 3P4WD_3E_3V3I

Metering form 3-Phase 4-Wire DELTA, 3-Elements, 3-Voltages, 3-Currents

Figure 5-3. Service Type 1 – 3P4WD_3E_3V3I

In the most straight-forward, default non-transformational processing, metering with form type:1 is mathematically the equivalent to metering with form type:0. However, as expected, differences would be evident in different reported results for phase-phase voltage values as well as phasing between the voltage and current channels.

Dto4WY_TRANSFORM EQUATIONS:

The DtoY_TRANSFORM option enables the following alternate transform equations:

VA = V1 – V3/3
VB = V2 – V3/3
VC = (2/3)V3

Note: Transforms may introduce metering artifacts in the case of non-Blondel and unbalanced situations.

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