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1. (WO1993017791) SYSTEM DE COMMANDE POUR BOBINE DE SELF A INDUCTANCE VARIABLE UTILISEE DANS UN FILTRE ELECTROSTATIQUE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS
1. An apparatus for varying the inductance of a variable inductance current limiting reactor (VICLR), said VICLR including at least one inductance winding and a control winding, said apparatus comprising: pulse generating means for providing DC voltage pulses to said control winding of said VICLR including means for varying the inductance of said VICLR by altering the number of said pulses supplied to said control winding within a predetermined periodic time span.

2. An apparatus as in claim 1 wherein said pulse generating means comprises: switch means for periodically switching AC voltage input into said switch means into

DC voltage output pulses, said apparatus further comprising rectifying means connected between said switch means and said control winding of said VICLR for rectifying the current applied to said control winding of said VICLR.

3. An apparatus as in claim 2 including means for adjusting the inductance of a VICLR in cooperation with an electrostatic precipitator automatic voltage control system.

4. An apparatus as in claim 3 further comprising means for increasing the inductance of said VICLR by decreasing the number of voltage pulses to said control winding of said VICLR during said periodic time span and means for decreasing the inductance of said VICLR by increasing the number of voltage pulses to said control winding of said VICLR during said periodic time span.

5. An apparatus as in claim 4 wherein the inductance of said VICLR is reduced if the primary form factor of said electrostatic precipitator automatic voltage control system departs from a desired value.

6. An apparatus as in claim 4 wherein the inductance of said VICLR is reduced if the secondary fractional conduction of said electrostatic precipitator automatic voltage control system departs from a desired value.

7. An apparatus as in claim 4 wherein the inductance of said VICLR is reduced if the firing angle limit of SCRs utilized in said electrostatic precipitator automatic voltage control system is reached.

8. An apparatus as in claim 4 wherein the inductance of said VICLR is increasedif the current relationship insaidelectrostaticprecipitatorautomaticvoltage control system departs from a desired current relationship.

9. The method of controlling the inductance of a Variable Inductance Current limiting Reactor (VICLR) in cooperation with anelectrostaticprecipitator automatic voltage control system, said VICLR having a control winding and at least one inductance winding, said method further comprising: selecting a number of DC voltage pulses in association with a predetermined periodic time span to represent the application of full power to said control winding of said VICLR and wherein applying said selected number of DC voltage pulses to said control winding during one time span of said periodic time span will alter the inductance of said VICLR to its minimum value and wherein applying zero (0) DC voltage pulses to said control winding during one time span of said periodic time span will alter the inductance of said VICLR to its maximum value; and applying a number of said selected number of DC voltage pulses to said control winding of said "VTCLR wherein the greater the applied number the lesser the inductance of the VICLR.

10. The method as set forth in claim 9 including: obtaining data indicative of the operating efficiency of said electrostatic precipitator automatic voltage control system; and altering the number of said DC voltage pulses applied to said control winding of said VICLR during one time span of said periodic time span if said system departs from a desired efficiency level to change the inductance of the VICLR and inαease system operating efficiency.