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.
The table below provides the configuration for each Service Type.
| TYPE | Service Type | Elements | V inputs [Voltage Channels] | #I inputs [Current Channels] | P/S | |
|---|---|---|---|---|---|---|
| 0 |
Three-phase 4-wire Wye (3-element) | 3P4WY_3E_3V3I | 3 | 3 [v1, v2, v3] | 3 [i1,i2,i3] | P |
| 1 |
Three-phase 4-wire Delta (3-element) | 3P4WD_3E_3V3I | 3 | 3 [v1, v2, v3] | 3 [i1,i2,i3] | P |
| 2 |
Three-phase 4-wire Wye (2-½ element) (Note 1) | 3P4WY_2p5E_2V3I | 2 1/2 | 2 [v1, v2, v3] | 3 [i1,i2,i3] | P |
| 3 |
Three-phase 4-wire Delta (2-element) (Note 2) | 3P4WD_2E_3V2I | 2 | 3 [v1, v2, v3] | 2 [i1,i3] | P |
| 4 |
Three-phase 3-wire Delta (2-element) | 3P3WD_2E_2V2I | 2 | 2 [v1, v3] | 2 [i1,i3] | P |
| 5 |
Two-phase 3-wire Network (2 element) (Note 3) | 2P3W_2E_2V2I | 2 | 2 [v1, v3] | 2 [i1,i3] | P |
| 6 |
Single-phase 3-wire (1-½ element) (Note 4) | 1P3W_1p5E_1V2I | 1 1/2 | 1 [v1] | 2 [i1,i3] | P |
| 7 |
Single-phase 2-wire (1 element) | 1P2W_1E_1V1I | 1 | 1 [v1] | 1 [i1] | P/S |
| 8 |
Single-phase 3-wire (1 element) (Note 5) | 1P3W_1E_2V1I | 1 | 2 [v1, v3] | 1 [i1] | P |
Note:
- For the Three-phase 4-wire Wye 2-½ element meter, any one phase voltage may be selected to be the missing phase, and the missing voltage will be internally imputed from the other 2 phase voltages.
- For the Three-phase 4-wire Delta 2 element meter, one current sensor is used to measure the collective current of two phases, (IA-IB). All phase voltages VA, VB, and VC are measured.
- For the Two-phase 3-wire 2 element meter, three common service
types with two separate voltage phases and two separate
currents may be metered by this mathematically identical
service type. These are commonly known as:
- Two-phase 3-wire Network (2p3WN)
- Single-phase 3-wire 2 element (1p3W_2E)
- Two-phase 5-wire (2p5W) with 2 current sensors each used to measure the collective currents of (IA-IA’) and (IC-IC’)
- For the Single-phase 3-wire 1-½ element meter where only one phase-phase voltage, VAC, is measured. However, 2 current elements are measured.
- For the Single-phase 3-wire 1 element meter where two individual phase voltages, VA and VC, are measured. However, only one current element is measured.
The METER_TYPE contains all the possibilities for the Service Type available and their configurations.
