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Apparatus for controlling the reactive impedance of a transmission line

  • US 4,999,565 A
  • Filed: 01/02/1990
  • Issued: 03/12/1991
  • Est. Priority Date: 01/02/1990
  • Status: Expired due to Fees
First Claim
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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:

  • 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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