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| Number | Title | Issue Date |
| 7432697 | Universal input device for a tap changer A control system providing a universal input for receiving a control signal for actuating tap-changing equipment. The system accommodates virtually any signal voltage level commonly used for control of the tap-changing equipment, modifies the received signal to a de... | 10/07/2008 |
| 7271572 | Apparatus and methods for providing a voltage adjustment for single-phase voltage regulator operation in a three-phase power system Provided is an apparatus and method for providing a voltage reduction for single-phase voltage regulator operation in a three-phase power system. The voltage regulator includes a plurality of tap positions selectable to adjust a voltage at a load to an in-band area.... | 09/18/2007 |
| 7261802 | EDI module with stabilizing DC current A stabilizing DC current interface for an electro-deionization (EDI) water purifying module. Each EDI module comprises anionic/cationic membranes, a center pipe, nets/spacers in concentrate/dilute water chambers and an anode and cathode for coupling to the stabilizi... | 08/28/2007 |
| 7158041 | Electrical protection device and method for a communication circuit A protection device for a communication circuit that includes a sensor monitoring a protection device parameter and an indication module coupled to the sensor. The indication module generates an indication output as a function of the protection device parameter indi... | 01/02/2007 |
| 7136724 | Electrical power distribution system for street lighting The invention comprises an electric power distribution system for providing power to a plurality of loads. An energy reduction device receives high voltage electrical power from a utility. A processor controls three variable transformer windings to produce electrica... | 11/14/2006 |
| 7084590 | Booster and motor controller A voltage sensor (101) is connected to output terminals (P, N) of a booster. The voltage sensor (101) detects a boosted voltage, and outputs the detected voltage to a first drive controller (102). The first drive controller (102) outputs ... | 08/01/2006 |
| 7062392 | Configurable voltage regulator A voltage regulator has a plurality of predetermined configurations and comprises a measurement circuit to measure an electrical characteristic of at least one external impedance and to determine a digital value corresponding to the measured electrical characteristi... | 06/13/2006 |
| 7054127 | Methods and apparatus to protect against voltage surges A cable device includes an integrated surge protection circuit. In the event that, communication signals conveyed by the cable include (potentially damaging) transient voltages, the surge protection circuit integrated in the cable suppresses the transient voltages a... | 05/30/2006 |
| 7026724 | Method for limiting current of starter/alternator in generator mode The system is directed to preserve the starter/alternator in an IC engine installation from potential overload and failure in response to electrical load increases. The system controller monitors starter/alternator output and phase current and regulates output volta... | 04/11/2006 |
| 6970794 | Semiconductor having reduced configuration pins and method thereof A configurable semiconductor device having a plurality of predetermined configurations comprises a measurement circuit to measure an electrical characteristic of at least one external impedance and to determine a digital value corresponding to the measured electrica... | 11/29/2005 |
| 6965217 | Tap changing assembly for power transformer A tap changing assembly for power transformers having vacuum interrupters each of which is associated with a radio interrogated surface wave sensor capable of detecting whether the respective vacuum interrupter opens circuit in a timely manner. The sensors are inter... | 11/15/2005 |
| 6927562 | Power factor/tan δtesting of high voltage bushings on power transformers, current transformers, and circuit breakers Measurement of power factor to diagnose the condition of high powered stand-off insulators, which include a roll of insulating material carrying an intermediate layer of conductor between layers of the insulating material around a central HV conductor in a hollow in... | 08/09/2005 |
| 6664771 | Power regulation of electrical loads to provide reduction in power consumption A power regulation system is coupled to an AC power source outputting an input voltage. The system has a first transformer to receive the input voltage and generate a control voltage. The system also has a second transformer that has a primary coil and a ... | 12/16/2003 |
| 6486641 | Power regulation of electrical loads to provide reduction in power consumption A power regulation system is coupled to an AC power source outputting an input voltage. The system has a first transformer to receive the input voltage and generate a control voltage. The system also has a second transformer that has a primary coil and a ... | 11/26/2002 |
| 6472850 | Method and apparatus for determining voltage regulator tap position A method for dynamically determining tap position in a step voltage regulator is disclosed. A present tap position is determined and the value of an applied voltage across a tap changing mechanism is measured. Based upon the value of the applied voltage, ... | 10/29/2002 |
| 6313614 | Method and a device for controlling a secondary voltage in a transformer device connected to a power network and comprising an on-load tap-changer In a method for controlling a secondary voltage (US) in a transformer device connected to a power network with a given system frequency (f1), which transformer device comprises a tap-changer (TC) which, in dependence on a supplied control signa... | 11/06/2001 |
| 5877613 | High-voltage generator with voltage control on the basis of the discharge current During the production of, for example ozone, an electric corona discharge is generated in atmospheric air by means of the high-voltage generator, so that ozone is formed from atmospheric oxygen. The high-voltage generator applies a high voltage between tw... | 03/02/1999 |
| 5646512 | Multifunction adaptive controls for tapswitches and capacitors A power system relay combining the functions of tapchanger control, capacitor control, substation data monitoring and communications.... | 07/08/1997 |
| 5642290 | Expansion chassis for a voltage regulator controller A voltage regulator controller having integral expansion ports. The expansion ports are provided by way of an I/O expansion chassis which is electrically coupled to the controller's microprocessor.... | 06/24/1997 |
| 5581173 | Microcontroller-based tap changer controller employing half-wave digitization of A.C. signals A microcontroller-based tap-changer controller including apparatus for keeping track of an electrically closed tap position and for automatically changing the tap setting of load tap-changing transformers and regulators; the tap-changer controller further... | 12/03/1996 |
| 5450002 | Co-controller for controlling an LTC transformer with a standard voltage regulator control A co-controller provides communication between a standard voltage regulator controller and an LTC transformer, to enable the standard controller to be used in the operation of the LTC transformer. The co-controller generally consists of an interface circu... | 09/12/1995 |
| 5136233 | Means and method for controlling elecrical transformer voltage regulating tapchangers An apparatus and method for controlling tapchanger operation on voltage regulating transformers includes a plurality of transducers to obtain real time voltage, wattage and reactive power readings, along with status readings for breakers associated with c... | 08/04/1992 |
| 5055766 | Voltage regulator compensation in power distribution circuits An electronic device for compensating voltage fluctuations in an electrical power distribution circuit controls operation of a transformer of the type having a TCUL voltage regulator by automatically calculating the voltage bandwidth of the transformer ba... | 10/08/1991 |
| 4860145 | Tap switching protection circuit A protection circuit is provided for a tap switching line voltage regulator of the type which selectively switches in one of a predetermined number of taps on a winding of a transformer. The selective switching of the taps is controlled in response to the... | 08/22/1989 |
| 4695737 | Microcomputer controlled power regulator system and method A load-compensating power distribution regulator system includes a plurality of circuit regulators interfaced to a single microcomputer, the microcomputer sensing for each circuit a regulator voltage and an output current. The microcomputer compares a com... | 09/22/1987 |
| 4630220 | Voltage controller A control device for regulating the output voltage of a voltage regulator wherein the output from that regulator would normally be variable includes inputting that voltage to the control device. There are two overlapping bands which define an effective ba... | 12/16/1986 |
| 4591831 | Position angle transducer for tap changing transformers A position angle transducer for voltage compensating tap changing transformers provides secondary tap number or tap position analog output signals which accurately reflect the secondary tap position even if a non-linear relationship obtains between the sh... | 05/27/1986 |
| 4434388 | Electrical lighting controller The following specification discloses an electrical power controller that has been specifically directed toward the control of lighting. The invention is directed toward reducing electrical energy consumption of high intensity discharge (HID) lamps and fl... | 02/28/1984 |
| 4419619 | Microprocessor controlled voltage regulating transformer A voltage regulating transformer utilizing a microprocessor and a versatile multipurpose set of hardware modules and software modules it is described. A standard tap changing mechanism is driven in response to an analog control signal to change the output... | 12/06/1983 |
| 4346341 | Method and apparatus for automatic voltage reduction control Automatic voltage reduction is provided by a voltage regulator by monitoring utility load currents and comparing the load currents to a predetermined current value. When the predetermined current value is exceeded, the voltage input to the voltage regulat... | 08/24/1982 |
| 4204147 | Power transfer apparatus A power transfer apparatus includes an impedance matching system coupled between a variable voltage source, e.g., a solar cell array, and a load. A parameter of the load indicative of the power being delivered to the load is sensed and the control signal ... | 05/20/1980 |
| 4063148 | First house protector for voltage regulators and the like A control circuit for limiting the output voltage of a voltage regulator or the like to a safe level for consumers connected close to the voltage regulator. The output voltage of the regulator is measured and compared to a reference. If the voltage exceed... | 12/13/1977 |
| 3952240 | Device for regulating the current in a load A device for regulating the current in a load includes a voltage-frequency converter for direct proportionally converting a voltage proportional to the load current into a number of pulses per time unit; a counter and a memory with a corresponding indicat... | 04/20/1976 |
