Apparatus for controlling the reactive impedance of a transmission line
First Claim
1. Apparatus for controlling the reactive impedance of a transmission line where capacitive reactance is inserted in series in said line to compensate inductive reactance to a predetermined compensation level where the reactive impedance is lowered, said apparatus comprising:
- a plurality of three or more capacitor modules, each having a predetermined capacitive reactance, connected to each other in series to form a series combination of capacitor modules having a combined capacitive reactance represented by the arithmetic sum of said predetermined capacitive reactances, said combined capacitive reactance providing a maximum said compensation level where reactive impedance of said line is at a minimum level;
said predetermined capacitive reactance of each of said capacitor modules varying in magnitude from a maximum to a minimum in substantially geometric steps for providing modulation of said compensation level from said maximum to a minimum, at least a portion of said modules including solid state bypass switches with control inputs for conductively bypassing a selected module or modules in said series combination;
control means connected to the control inputs of substantially all of said modules for automatically varying said combined capacitive reactance in response to a desired change in a parameter of said transmission line.
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Abstract
Apparatus for controlling the reactive impedance of a transmission line where capacitive reactance is inserted in series in the line to compensate inductive reactance includes a plurality of three or more capacitor modules connected to each other in series to form a series combination of capacitor modules. Each module is individually bypassed by fast acting thyristor bypass switches so that a central automatic control system can selectively place all of the modules in series where a maximum compensation level is achieved (meaning that the total reactive impedance is at a minimum level), or to provide a minimum change with just one capacitor module.
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Citations
7 Claims
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1. Apparatus for controlling the reactive impedance of a transmission line where capacitive reactance is inserted in series in said line to compensate inductive reactance to a predetermined compensation level where the reactive impedance is lowered, said apparatus comprising:
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a plurality of three or more capacitor modules, each having a predetermined capacitive reactance, connected to each other in series to form a series combination of capacitor modules having a combined capacitive reactance represented by the arithmetic sum of said predetermined capacitive reactances, said combined capacitive reactance providing a maximum said compensation level where reactive impedance of said line is at a minimum level; said predetermined capacitive reactance of each of said capacitor modules varying in magnitude from a maximum to a minimum in substantially geometric steps for providing modulation of said compensation level from said maximum to a minimum, at least a portion of said modules including solid state bypass switches with control inputs for conductively bypassing a selected module or modules in said series combination; control means connected to the control inputs of substantially all of said modules for automatically varying said combined capacitive reactance in response to a desired change in a parameter of said transmission line. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification