Patent ID: 6229295
Filing Date: 2001-05-08
Classification: G01R,H02M

Abstract:
An apparatus for metering at least one selectable type of electrical power over a predetermined range of polyphase service voltages supplied by electrical service providers, said predetermined range of polyphase service voltages including at least two of 120 Vrms, 208 Vrms, 240 Vrms, 277 Vrms and 480 Vrms, said electrical power comprising a voltage component and a current component, said apparatus comprising:a plurality of voltage input circuits, each being connected to receive a voltage component of one phase of any polyphase service voltage within said predetermined range of polyphase service voltages and to divide said voltage component to a divided voltage that is a substantially linear voltage having a substantially stable phase shift over said predetermined range of polyphase service voltages;a plurality of current input circuits, each being connected to receive a current component associated with said one phase and to produce an induced current proportional to said current component;a processing unit, connected to receive said divided voltage of each phase and said induced current of each phase to determine said at least one type of electrical power, wherein said processing unit is operable in response to a supply voltage and adapted to determine a plurality of types of electrical power; anda power supply, connected to said processing unit, which receives a voltage component of any polyphase service voltage within said predetermined range of polyphase voltages and generates said supply voltage from said voltage component of said predetermined phase,said apparatus comprising the same physical components when operating with any polyphase service voltage within said predetermined range of polyphase service voltages.