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Class Information
Number: 323/209
Name: Electricity: power supply or regulation systems > For reactive power control > Using impedance > Switched impedance
Description: Subject matter wherein the impedance is connected to the main power circuit through a switch which is controllably operable.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7630844 |
Field device electronics fed by an external electrical energy supply |
Dec. 8, 2009 |
| 7558086 |
Inverter control circuit with a resonant frequency modulation function |
Jul. 7, 2009 |
| 7558088 |
Power supply device |
Jul. 7, 2009 |
| 7514907 |
Device, system, and method for providing a low-voltage fault ride-through for a wind generator farm |
Apr. 7, 2009 |
| 7323213 |
Apparatus and method for discharge surface treatment |
Jan. 29, 2008 |
| 7265679 |
Apparatus and method for indicating onset of high-voltage at an output locus of a signal converter device |
Sep. 4, 2007 |
| 7245045 |
T-filter for reducing disturbances generated on a power grid by an active filter |
Jul. 17, 2007 |
| 7212562 |
System and method for controlling total electrical power across multiple furnaces using electrode positioning |
May. 1, 2007 |
| 7127288 |
Method and apparatus for low power, regulated output in battery powered electrotherapy devices |
Oct. 24, 2006 |
| 7095139 |
Transformer inrush current elimination system |
Aug. 22, 2006 |
| 7091703 |
Dynamic reactive compensation system and method |
Aug. 15, 2006 |
| 7067011 |
Apparatus and method for discharge surface treatment |
Jun. 27, 2006 |
| 6841976 |
Multi-line power flow transformer for compensating power flow among transmission lines |
Jan. 11, 2005 |
| 6788558 |
Passive common mode filter and method for operating a passive common mode filter |
Sep. 7, 2004 |
| 6783795 |
Power supply apparatus for discharge surface treatment |
Aug. 31, 2004 |
| 6747373 |
System and method for coordinated control of a switched power capacitor with an integrated resonance protection system |
Jun. 8, 2004 |
| 6702896 |
Apparatus and method for discharge surface treatment |
Mar. 9, 2004 |
| 6573691 |
Control system and method for voltage stabilization in electric power system |
Jun. 3, 2003 |
| 6559622 |
System for preventing overreach of protection for series compensated power lines |
May. 6, 2003 |
| 6509785 |
Voltage regulator circuit for attenuating inductance-induced on chip supply variations |
Jan. 21, 2003 |
| 6420856 |
Versatile power flow transformers for compensating power flow in a transmission line |
Jul. 16, 2002 |
| 6396248 |
Versatile power flow transformers for compensating power flow in a transmission line |
May. 28, 2002 |
| 6392390 |
Synchronous switching apparatus for use with a multiple phase power system |
May. 21, 2002 |
| 6326773 |
Power conversion apparatus |
Dec. 4, 2001 |
| 6288918 |
Switched power converter with hold-up time and harmonics reduction |
Sep. 11, 2001 |
| 6285169 |
Sag generator with switch-mode impedance |
Sep. 4, 2001 |
| 6260975 |
Power control apparatus having a control voltage filtering means with multiple time constants |
Jul. 17, 2001 |
| 6246595 |
Series control of electric ARC furnaces |
Jun. 12, 2001 |
| 6181113 |
Harmonic resonance control and protection system for switched power factor control capacitor devices |
Jan. 30, 2001 |
| 6107785 |
Polyphase static var compensator arrangement for supply voltage regulation by energy dissipation |
Aug. 22, 2000 |
| 6028417 |
Voltage regulator circuit for attenuating inductance-induced on-chip supply variations |
Feb. 22, 2000 |
| 5952816 |
Compensation for power transfer systems using variable rotary transformer |
Sep. 14, 1999 |
| 5949221 |
Line powered, primary side connected apparatus injecting voltage compensation into an electric power line using one transformer |
Sep. 7, 1999 |
| 5869953 |
Retrofittable energy saving device |
Feb. 9, 1999 |
| 5804949 |
Thyristor-controlled series capacitor triggering system |
Sep. 8, 1998 |
| 5801460 |
Electrical power transmitting system with reduced feeder size and method of operation |
Sep. 1, 1998 |
| 5751116 |
Apparatus to retrofit an HID light fixture |
May. 12, 1998 |
| 5712774 |
Device for suppressing higher harmonic current of power source |
Jan. 27, 1998 |
| 5691626 |
Active damping control for active power filter |
Nov. 25, 1997 |
| 5684389 |
Switch-off method for a three-phase reactive power compensator with two thyristor switches |
Nov. 4, 1997 |
| 5672956 |
Static reactive power compensating equipment |
Sep. 30, 1997 |
| 5654625 |
Switching circuit for a reactive power compensation device having synchronized on and off switching |
Aug. 5, 1997 |
| 5570007 |
Method and apparatus for static VAR compensator voltage regulation |
Oct. 29, 1996 |
| 5539653 |
Method and apparatus for reassigning lost capacitors in a power distribution network |
Jul. 23, 1996 |
| 5489838 |
Method and apparatus for generating a synchronizing signal for a controlled series compensator |
Feb. 6, 1996 |
| 5461303 |
Power factor correction precompensation circuit |
Oct. 24, 1995 |
| 5450001 |
Process and device for safeguarding an alternating current circuit having an electrical load associated therewith |
Sep. 12, 1995 |
| 5434497 |
Vernier enhanced control for shunt connected thyristor-controlled capacitors |
Jul. 18, 1995 |
| 5422561 |
Automated voltage and VAR control in power transmission and distribution networks |
Jun. 6, 1995 |
| 5399955 |
Power factor improving arrangement |
Mar. 21, 1995 |
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