Robert Sonderegger is a
director and software engineering advisor at Itron. He is
responsible for technical leadership, software innovation
and advanced technology.
Electric meters are connected to secondary distribution transformers to
reduce distribution high voltage to safe levels for households. There are
many transformers of different capacities along distribution lines, both
underground and overhead. The choice of which transformer a meter is
connected to is dictated by physical proximity as well as by optimal loading
of transformer capacity. This connection between an individual meter and a
distribution transformer is known as transformer connectivity.
by comparing meter voltage to that of
neighboring meters and find misplaced
or misfiled meters.
Performing analytics on smart meter
data without accurate and timely knowledge of meter-to-transformer or meter-to-phase connectivity is like finding your
way with an out-of-date map. Advanced
grid connectivity algorithms are like the
GPS for smart grid analytics, allowing
utilities to accurately and timely track
meter locations in relation to the transformers that serve them.
the correct home for the subject meter.
IMPORTANCE OF ACCURATE
Accurate meter-to-transformer con-
nectivity as well as meter-to-phase is
essential to enable a truly smart grid. It
allows utilities to analyze each line seg-
ment from meter to feeder for revenue
assurance and theft detection, and to
gain valuable insight into their distribu-
tion systems. Utilities can detect power
theft and high-impedance connections
Furthermore, the transformer to which
the meter with the highest affinity is con-
nected indicates the most likely correct
transformer for the subject meter.
Figure 2 shows a sample of 597 meters
whose home affinity is shown on the
Y-axis and the away affinity on the
X-Axis. All meters in the top left half of
the figure have correct connectivity as
stated, while the 10 percent of meters in
the bottom right half are clearly miscon-nected. For any one meter in this group,
its away affinity on the x-axis points to
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