Three methods of measuring dielectric power loss and power factor

The paper presents a brief description of the methods of measuring dielectric power loss and power factor in commercial use at the Electrical Testing Laboratories. The several methods are handled individually and their advantages and disadvantages listed. Appendixes are included on the use of the shunted electro-dynamometer as an ammeter, determination of compensation, effect of incorrect compensation in the wattmeter shunt, effect of slightly unbalanced voltages on three-phase measurements, a three-phase wattmeter switch and shielding, grounding, etc.