Methods and apparatus for voltage measurement
AssigneeGeneral Electric Company
InventorMaurice J. Ouellette
Life of this patent
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Abstract
A method is described for measuring a plurality of line voltages using a measurement circuit, the method including the steps of reducing each line voltage over a first impedance; providing a second impedance between each of the reduced voltages and a measurement circuit common reference point; coupling the common reference point to a voltage line N using a third impedance; and determining line voltage values using measurements of the reduced voltages. The above-described method provides impedance between voltage line N and measurement electronics and thus prevents transient voltages from entering the measurement circuit.
Claims20
A method for measuring a plurality of line voltages using a measurement circuit, said method comprising the steps of:
- reducing each line voltage over a corresponding first impedance;
- providing a second impedance between each of the reduced voltages and a measurement circuit common reference point;
- providing a third impedance configured to facilitate preventing transient currents within a voltage line;
- coupling the common reference point to the voltage line using the third impedance;
- and
- determining line voltage values using measurements of the reduced voltages.
A voltage measurement circuit for measuring a plurality of line voltages, said measurement circuit comprising:
- a measurement circuit common reference point;
- a first impedance for each line voltage and a reduced voltage measurement point for each line voltage, said first impedance coupling the corresponding line voltage to said corresponding reduced voltage measurement point;
- a second impedance for each line voltage, said second impedance coupling said corresponding reduced voltage measurement point to said measurement circuit common reference point;
- and
- a third impedance coupling said measurement circuit common reference point to a voltage line, said third impedance configured to facilitate preventing transient currents within said voltage line.
Dependencies are inferred from the claim text.