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Loss compensation in energy meter tests


Loss compensation tests in energy meters verify if the loss compensation algorithms are following the standard methodology, suggested in the Handbook for Electricity Metering, elaborated by the Edison Electric Institute. They are performed since 2000 by the Electrical Energy Measurement Laboratory (LabMed), located in the Fundão Unit.


The installation of energy meters in market agents’ trading points is performed through the connection on the secondary winding of the instrument transformers (TCs and TPs). If these instrument transformers have their primary winding connected in the Basic Network voltage levels(500kV, 440kV, 345kV, 230kV), the installation will cost more than when the primary is connected in lower voltages (138kV, 88kV and 69kV), especially due to the insulating class required for the instrument transformers, both for current and power.


To connect the meter from lower voltage levels, it is necessary to estimate the losses in power transformers, since they are not directly measured. The algorithms intended for such estimations are called "loss compensation algorithms". In the event of meters to be located in power trading points of the National Interconnected System (SIN), the use of this resource is conditioned to an exceptionality request sent to the National Operator of the Electric System (ONS) and to the Electric Energy Trading Chamber (CCEE), which will analyze the request.


Some meters have loss compensation algorithms. When assessed, it was verified that despite the changes in the data input, most of them presented a common core, suggested in the Handbook for Electricity Metering.


The main clients of these tests are the manufacturers of energy meters with loss compensation algorithms.


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