PHASE VERIFICATION OF POWER TEST SYSTEMS

One aspect of the problem of the measurement of the losses in low powe r factor devices such as power transformers or power reactors is the v erification of the phase angle properties of both the complete system and its various component parts. This paper proposes the use of a digi tal phase standard as a solution to this and other phase measurement p roblems. When a phase standard is synchronized in both phase and frequ ency, then its precise digital phase shift properties, used in conjunc tion with passive phase bridges, allow the design of high-power, high- accuracy (better than 0.001-degrees), phase verification schemes. Meth ods using this approach are outlined that use commercially available, easily transportable equipment to provide rapid and accurate phase ang le measurements for almost all possible combinations of current and vo ltage.