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.
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) †1 | 3P4WY_2p5E_2V3I | 2 1/2 | 2 [v1, v2, v3] | 3 [i1,i2,i3] | P |
3 |
Three-phase 4-wire Delta (2-element) †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) †3 | 2P3W_2E_2V2I | 2 | 2 [v1, v3] | 2 [i1,i3] | P |
6 |
Single-phase 3-wire (1-½ element) †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) †5 | 1P3W_1E_2V1I | 1 | 2 [v1, v3] | 1 [i1] | P |
The next chapters show the configuration for each Service Type.
†1 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.
†2 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.
- 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’)
†4 For the Single-phase 3-wire 1-½ element meter where only one phase-phase voltage, VAC, is measured but 2 current elements are measured.
†5 For the Single-phase 3-wire 1 element meter where two individual phase voltages, VA & VC, are measured but only one current element is measured.
METER_TYPE contains all the possibilities for the Service Type available and their configurations.