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| Number | Title | Issue Date |
| 7869167 | Method and device for prevention and protection of electrical transformer against explosion and fire The present invention relates to the system and method for protection, prevention and or detection of the explosion and or resulting fire in electrical transformers in advance, i.e before decomposition of combustible coolant fluid/dielectric oil. ... | 01/11/2011 |
| 7738221 | Transformer inrush current detector A differential protection system for power transformers using Rogowski coils as current sensors can support an inrush current detection method based on sensing lows in the derivative of the sensed current. Effective detection of power transformer inrush conditions c... | 06/15/2010 |
| 7369383 | Protective circuit A protective circuit (1), particularly for overvoltage-protecting an electronic motor control unit, comprises a signal connection receiving and/or emitting an electrical signal, a switching element (4) which activates or deactivates a protective interr... | 05/06/2008 |
| 7365451 | Power converter A power converter that can continue to operate after suffering a partial failure. The power converter includes multiple array transformers; normally-on switches connected respectively in series with the ends of each of the primary windings of the array transformers;... | 04/29/2008 |
| 7340355 | Compensated current differential relaying method and system for protecting transformer Disclosed is a compensated current differential relaying method and system for protecting a transformer more correctly by calculating and estimating an exciting current including a core-loss current and a magnetizing current, and, in particular, to a compensated cur... | 03/04/2008 |
| 7336046 | Short-circuit detection in electric path connecting drive device and load A control device controls a drive signal supplied from a drive device to a load apparatus along an electric path connecting the drive device and the load apparatus. The drive device receives a PWM (pulse width modulation) signal to PWM-control the drive signal, dete... | 02/26/2008 |
| 7317603 | Integrated circuit with electrostatic discharge protection An integrated circuit with electrostatic discharge protection includes a first transistor with a source terminal, a drain terminal and a gate terminal, and a second transistor with a source terminal, a drain terminal and a gate terminal. The gate terminal for each o... | 01/08/2008 |
| 7301742 | Method and apparatus for accessing and activating accessory functions of electronic circuit breakers An electronic trip unit for a circuit breaker includes a programmed microprocessor and a module plug in removable signal communication with the microprocessor. The module plug includes a program identifier. The microprocessor recognizes the program identifier and ac... | 11/27/2007 |
| 7294973 | Discharge tube lighting apparatus, light source apparatus, and display apparatus A discharge tube lighting apparatus is used to drive a plurality of discharge tubes. The apparatus includes a balance coil having a winding input end and a plurality of winding output ends to which the discharge tubes are connected individually; a power section for ... | 11/13/2007 |
| 7288921 | Method and apparatus for providing economic analysis of power generation and distribution An economic dispatch program optimally allocates load demand specifying real power and reactive power to be generated by a power plant among various power generators in a manner so that each of the power generators are operated within its optimal operating space as ... | 10/30/2007 |
| 7260452 | Apparatus, method and computer program product for monitoring AC line current through the step start resistors of a high voltage power supply A circuit to monitor ac line current through resistors employed to provide a ‘step start’ in a power supply, including means to monitor the current flowing through the step start resistors, comprising a peak detector, a sample and hold circuit, an analog to digi... | 08/21/2007 |
| 7250794 | Voltage source converter A voltage source converter with a line-side diode rectifier, a load-side inverter with an electronic circuit, a power supply for the electronic circuit, and a slim DC link with a DC link capacitor is described. The slim DC link connects a DC output side of the line-... | 07/31/2007 |
| 7199988 | Discharge tube lighting transformer with protective circuit against non-grounding of ground terminal An arrangement is made in a transformer such that voltages induced on the opposite sides of a mid-point 17 of a secondary winding 16 are unbalanced by an amount on the order of 5%. When a ground terminal 18 is not grounded while a mid-point of a... | 04/03/2007 |
| 7196884 | Apparatus and method for detecting the loss of a current transformer connection coupling a current differential relay to an element of a power system Disclosed is an apparatus and method for detecting a loss of a current transformer connection coupling a protective relay to a power system element of a three-phase power system and providing a plurality of secondary current waveforms of the three-phase power system... | 03/27/2007 |
| 7126354 | Circuit configuration having a load transistor and a current measuring configuration, method for ascertaining the load current in a load transistor, semiconductor component, and measuring configuration A circuit configuration has a load transistor and a current measuring configuration. A method ascertains a load current through a load transistor. The circuit configuration includes a first and a second current sensor with a current measuring transistor in each case... | 10/24/2006 |
| 7119504 | Protective circuit for reducing electrical disturbances during operation of a DC motor A protective circuit, for reducing electrical disturbances or interference during operation of a DC motor, features a series transistor (62) arranged in a supply lead from a DC voltage source (12) to a DC motor; an auxiliary voltage source (52),... | 10/10/2006 |
| 7110235 | Arrangement for energy conditioning Circuit arrangement embodiments that use relative groupings of energy pathways that include shielding circuit arrangements that can sustain and condition electrically complementary energy confluences. ... | 09/19/2006 |
| 7088597 | High voltage supply device for eliminating a surge voltage A high voltage supply device including a power supply rectifying an externally inputted ac voltage and generating a first dc voltage and a second dc voltage, a controller generating a pulse signal having a predetermined duty ratio and a control signal having a first... | 08/08/2006 |
| 7006897 | Apparatus, method and computer program product for monitoring AC line current through the step start resistors of a high voltage power supply A circuit to monitor AC line current through resistors employed to provide a ‘step start’ in a power supply, including means to monitor the current flowing through the step start resistors, comprising a peak detector, a sample and hold circuit, an analog to digi... | 02/28/2006 |
| 7002784 | Current compensation method and device for power system protection The present invention relates to a method for current compensation of a protection system for protecting a zone in a power system, which zone comprises a number of transmission lines connected to power sources and a number of transmission lines connected to a number... | 02/21/2006 |
| 6996489 | Method and apparatus for sampling a power supply current of an integrated circuit, and storage medium onto which is recorded a control program therefor An apparatus for sampling a power supply current value for performing frequency analysis of the power supply current flowing in an integrated circuit with a test signal applied to the integrated circuit has a power supply generating a prescribed supply of power for ... | 02/07/2006 |
| 6937453 | Directional comparison distance relay system A directional comparison distance relay system for protecting a power transmission line. The relay system comprises a fault detection unit which includes a directional distance relay element for deciding whether a fault is in forward or reverse directions; a short-c... | 08/30/2005 |
| 6922318 | Ground relay system in a multiplex direct grounding system A ground relay system is provided which includes: first current transformers located in the respective phases of a sending end of a high-voltage distribution provided from a distribution substation; over-current relays connected to the first transformers; distributi... | 07/26/2005 |
| 6919785 | Pressure sensitive trip mechanism for a rotary breaker A pressure sensitive trip mechanism for actuating a circuit breaker operating mechanism to trip a circuit breaker includes a trip lever and a trip bar. The trip lever is rotatable about a first pivot. The trip bar is positioned proximate the trip lever. The trip bar... | 07/19/2005 |
| 6903912 | Method for recognition and/or limiting the short-circuit state of a switching converter and switching converter The invention pertains to a method for detecting and/or limiting short-circuit or overcurrent states of a switching regulator, where the load current or a variable proportional to the load current is measured and compared with a predetermined maximum value, and wher... | 06/07/2005 |
| 6870719 | Plausibility checking of current transformers in substations The invention relates to a method, a computer program and a device (20) for the plausibility checking of current transformers (7) in an electrical switchgear assembly (1) and to a switchgear assembly (1) having such a device (20). ... | 03/22/2005 |
| 6507184 | Methods and apparatus for differential current measurement in a three-phase power system A measure of the current through a first terminal of a device in a three-phase power system is obtained for each phase of the system. A measure of the current through a second terminal is also obtained for each phase. To compensate for any changes in phas... | 01/14/2003 |
| 6483680 | Magnetizing inrush restraint method and relay for protection of power transformers A method and relay for magnetizing inrush restraint in protective relays for power transformers. The method utilizes the phase angle relation between the fundamental component and the second harmonic in addition to the magnitude ratio. This is accomplishe... | 11/19/2002 |
| 6356421 | System for power transformer differential protection Current transformer (CT) secondary currents for the windings of a power transformer are used to produce a differential current. An operating current value is obtained from the differential current value. A restraining current value is obtained from proces... | 03/12/2002 |
| 6247003 | Current transformer saturation correction using artificial neural networks A method and apparatus of correcting for saturation in a current transformer, which outputs a current measurement, is provided. A switching algorithm receives a value of the current measurement from the current transformer and determines within which of t... | 06/12/2001 |
| 5963404 | Restricted earth fault protection for transformers using a directional element The residual phase currents for each selected winding of a transformer are first determined and then summed to provide a value designated IX. The neutral current for the transformer is also determined, with the neutral current being designated ... | 10/05/1999 |
| 5949343 | Supervisory apparatus for oil-filled electrical equipment There is provided at least one pressure detector for detecting a change in pressure of an insulating medium, a vibration detector for detecting vibration of an oil-filled electric equipment, and a determination processor for determining, based on informat... | 09/07/1999 |
| 5949633 | Fluorescent lamp drive system with transformer over-voltage protection circuit A transformer over-voltage protection circuit shuts down a resonant inverter when high voltages occur at the output of a transformer. The high voltages can be caused by a broken or removed display tube. The system is designed to be used in display system,... | 09/07/1999 |
| 5847910 | Fault protection device in a transformer A fault protection device incorporated in a transformer having a primary winding and at least two secondary windings connected to ground, and having a sensing coil to sense the fluxes generated by each of the secondary windings and generating a flux signa... | 12/08/1998 |
| 5815387 | Transformer protective apparatus having semiconductor and mechanical bypass means A power converter protective apparatus for protecting an AC-DC converter against an excess fault current by preventing the fault current of a power system from flowing into the AC-DC converter. The protective apparatus comprises a series transformer, whos... | 09/29/1998 |
| 5808844 | Current differential protection arrangement A current differential protection arrangement for an electric power supply unit with a measured value pre-processing device and an analysis device that checks on the basis of a predefined dependence of a differential current on a stabilizing current (resp... | 09/15/1998 |
| 5790357 | Differential current protection for a transformer A differential current protective device for a transformer arranged in a multi-phase power supply system and having at least one star-connected winding arrangement with a grounded star point. The differential current protective device receives currents pr... | 08/04/1998 |
| 5784233 | Differential protection device of a power transformer A preprocessing circuit receives signals representative of a current circulating in a primary winding and of a current circulating in a secondary winding of a transformer. The signals representative of currents are used to calculate the values of a throug... | 07/21/1998 |
| 5627712 | Transformer differential relay The reliability of transformer differential relays is enhanced by providing a method and apparatus which enable improved discrimination between transformer current differentials due to transformer inrush current and current differentials due the occurrenc... | 05/06/1997 |
| 5568343 | Circuit for protecting switching power source from overloads and shot circuits A protective circuit is used in conjunction with a switching power source for protecting the latter from overload and from short circuits. It is detected whether the current at the primary winding current of a switching power source transformer, the load ... | 10/22/1996 |
