Consumer phase identification: why it matters which phase a meter is on
A 0.4 kV network is three-phase, while most consumers are connected to a single phase. Which one is usually not recorded in diagrams or line documentation. Without it, losses cannot be calculated accurately and phase loads cannot be balanced.
Why does phasing matter?
- Losses. With unequal phase loads current also flows in the neutral, and losses are higher than with the same load split evenly.
- Voltage. On an overloaded phase remote consumers get lower voltage, on an underloaded one higher.
- Overload. One phase can be overloaded while the total load of the line is normal.
- Calculation accuracy. A per-phase network calculation needs to know who is on which phase.
Why can phasing not simply be found by trial?
A three-phase meter can be connected to the three network phases in six ways. For two meters there are already 6 × 6 = 36 options, for N meters — 6N. Even for 15 meters on one line, trying all options would take many days, and a substation can have dozens or hundreds of meters. Checking on site means walking to every connection.
What does GRID-IN do?
GRID-IN determines consumer phasing from AMI data and the network diagram, without a site walk, and uses it in a per-phase network calculation: currents and losses in the phases and in the neutral, load unbalance, consumer voltages. This shows where phase loads are uneven and which consumers are worth moving to another phase.
What is needed?
Load profiles of the substation input meter and of three-phase consumer meters — per phase (L1, L2, L3), not only as a total; a single-line network diagram. Details — Data requirements and Technical loss calculation.