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US 3,942,100 AGranted
Adjustable reactive power compensator for a transmission line
AssigneeBBC Brown, Boveri & Company, Limited
InventorsJosef Kauferle, Konrad Reichert
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AssigneeBBC Brown, Boveri & Company, Limited
InventorsJosef Kauferle, Konrad Reichert
Estimating the term…
An improved reactive power compensator for a transmission line is effective to correct voltage transients and overloads of diverse kinds. The reactive power developed by a conventional main reactive element such as a DC-bias controlled choke in the compensator is varied in accordance with an error signal representative of the difference between the instantaneous voltage across a particular junction of the line and a reference value. Excitation for the main element is supplied by a variable shunt reactance which exhibits a no-load inductive power loss that is large compared to the magnetization power loss of a conventional distribution transformer. The shunt reactance has an exciting winding coupled across the line at the junction and a power winding inductively coupled to the exciting winding for feeding the main reactive element.
A reactive power compensator for a transmission line comprising a reactive power drawing element, control means responsive to variations in the voltage at a prescribed junction of the line for varying the reactive power draw of the element, an adjustable shunt reactance having an exciting winding connected across the line and a secondary winding magnetically coupled to the exciting winding and connected to the element for energizing such element, said element drawing power from the reactance, said control means varying the power drawn from the reactance on the basis of variations in the line voltage so as to vary the reactive effect of the reactance.
An adjustable reactive power compensator for a transmission line comprising, a power-drawing reactive element;
A reactive power compensator for a transmission line, comprising a shunt reactor having a first winding connected across the line for varying the electrical conditions across the line, control means responsive to the conditions across the line for varying the reactance of said shunt reactor, characterized in that said control means includes a second winding inductively coupled to said first winding a power drawing element coupled to the second winding, and a control circuit responsive to the electrical conditions of the line and coupled to the power drawing element for varying the impedance of the element so as to draw power from the second winding through the element and thereby change the reactance of the shunt reactor.
Dependencies are inferred from the claim text.