Transformer loss compensation

Transformer Loss Compensation (TLC) is the method for compensating for the measurable losses that occur when there is a physical separation between the meter and the actual billing point.

TLC is used when a meter’s actual location is different from the electrical location where change of ownership occurs, for example, if meters are connected on the low-voltage side of power transformers but the ownership change occurs on the high-side of the transformer. Meters are usually installed on the low-voltage side of a transformer because it is more cost-effective

NOTE: Due to the variation in installations, advanced knowledge of power systems and connection methods is required before transformer loss compensation can be properly implemented. Data parameters should only be programmed by qualified personnel that have appropriate training and experience with Transformer Loss Compensation calculations.

There are cases where the change of ownership occurs halfway along a transmission line, where it is impractical to install a meter. In this case, power metering must be compensated using line loss calculations.

See the Transformer / line loss calculations technical note available fromwww.schneider-electric.com.

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