Method of detecting symmetrical components of supply-line three-

Details Method of detecting symmetrical components of supply-line three- Method of detecting symmetrical components of supply-line three-

1981-09-03

1984-05-29

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

324107, G01R 2500

Patent

active

044517831

ABSTRACT:
A method of detecting symmetrical components of a three-phase supply-line voltage comprises the steps of converting three-phase voltage to alternating single-phase voltage with the aid of at least two function generators (2), (3), with at least one of said function generators being an active-reactive circuit, which conversion of a three-phase voltage is effected by altering said supply-line voltage in amplitude and phase in said active-reactive circuits, and subsequently summing up output voltages of the function generators (2), (3), to produce symmetrical components of said three-phase voltage, forming a control signal proportional to a disturbance influencing the output voltages of the active-reactive circuits (4) and compensating said disturbance influence by control action, wherein according to the invention said control signal is formed from the difference in voltage drop between elements (5), (6) in each active-reactive circuit, and compensating said disturbance influence is done by summing up said control signal and said voltage drop across one of said elements (5), (6) in each active-reactive circuit (4).

REFERENCES:
patent: 3617863 (1971-11-01), Espen
patent: 3705344 (1972-12-01), Espen
patent: 4023075 (1977-05-01), Reuter

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