Compensating metering in theory and practice

OUTSTANDING economies can be effected by metering high voltage loads on the low voltage side of the power transformers. A compensating meter in combination with a watthour meter, both connected to instrument transformers on the low voltage side, provides accuracy equal to, and in some cases better than, metering on the high voltage side. The method permits the use of low voltage current transformers of relatively greater thermal and mechanical limits and of improved accuracy, in comparison with high voltage current transformers of relatively smaller current ratings.