Metering With Transformer-Loss Compensators

Abstract

Outstanding economies may be effected by metering high-voltage loads on the low-voltage side of the power transformers, and compensating the metering to include the transformer losses. The transformer-loss compensator is an accessory to the regular watt-hour meter on the low-voltage side and causes the meter to include the transformer losses in its registration. No changes are made in the meter itself, either structurally or in adjustments, it retains its integrity as a standard measuring instrument. The method is intended primarily for use on customers' installations where the contract provides for supplying and billing for energy and demand at distribution or transmission voltages. Based on established principles, the accuracy performance is equal to that of metering on the high-voltage side. Testing techniques have been developed and co-ordinated with meter testing practice, so that its routine application and maintenance can be done by metermen. This paper is the result of experience with compensating meters since 1932, and the more recent application of transformer-loss compensators. It is intended for electrical utility executives and engineers considering the possible advantages of the method for their systems and for guidance in co-ordinating the application of transformer-loss compensators with metering practice.