Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1995-06-07
1999-05-11
Ballato, Josie
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324141, 324107, G01R7/00;11/32
Patent
active
059031450
ABSTRACT:
A universal electronic energy meter for measuring electrical energy usage of a circuit having a 4-wire service is disclosed. The universal meter is operable with both 4-wire wye and 4-wire delta services without modification to the meter's hardware or software. The universal meter is further operable over a wide range of standard service voltages that are supplied in connection with 4-wire services. The universal meter includes a voltage divider network that senses the line voltages from the circuit and scales the line voltages to a voltage suitable for processing by the meter. The scaled voltage has a maximum peak-to-peak voltage irrespective of the particular standard service supplying the electrical energy to the circuit, and therefore, the voltage divider network is not reconfigured to accommodate a wide range of service voltages. The voltage divider network includes resistive dividers that scale the line voltage to provide a linear voltage with minimal phase shift. The universal meter also includes a power supply that is also operable over a wide range of service voltages. The power supply supplies a regulated fixed supply voltage used by the meter for processing functions carried out by the meter independent of the type of 4-wire service supplying the electrical energy to the circuit.
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Hemminger Rodney C.
Munday Mark L.
Schleifer Fred F.
ABB Power T & D Company Inc.
Ballato Josie
Kobert Russell M.
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