CIM Issues » WG14 Issues » WG14 Part 9 Issues

It is possible for a meter to be connected in primary fashion to the distribution voltage (above the service transformer.) When this happens, transformer losses are not reflected in the measurement. When large amounts of power flow, the 1-2% loss through the transformer accumulates to a considerable amount. Who pays for it? It is an unmetered loss. Usually this can be accounted for by an MDMS, but some high-end meters also offer a transformer loss compensation function. When active, all power measurements are adjusted by the meter. They look like any other measurement, but the compensation has already been applied.
We missed this usecase in our original analysis. The Part 9 team should add a new quality code that provides a new categorization of "compensated" and a new index of "transformer loss." This code could then markup the data and help prevent the compensation from being applied twice.