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| Number | Title | Issue Date |
| 7965193 | System and method for detecting distribution transformer overload A system, device, and method of detecting an overload condition of a distribution transformer that supplies power to one or more customer premises via a low voltage subnet is provided. In one embodiment, the method comprises determining the power output of the trans... | 06/21/2011 |
| 7961112 | Continuous condition monitoring of transformers A device and method for monitoring the condition of an electrical power transformer in an electrical power grid synchronously measures current and voltage data at both a high voltage side of the transformer and a low-voltage side of the transformer and computes from... | 06/14/2011 |
| 7724152 | Tap change operation monitoring apparatus for on-load tap charger It is intended to provide a tap change operation monitoring apparatus for an on-load tap changer which can employ relatively simple and low-cost torque sensing means by mitigating an accuracy requirement with regard to detecting a starting time of tap change operati... | 05/25/2010 |
| 7701357 | System and method for detecting distribution transformer overload A system, device, and method of detecting an overload condition of a distribution transformer that supplies power to one or more customer premises via a low voltage subnet is provided. In one embodiment, the method comprises determining the power output of the trans... | 04/20/2010 |
| 7336193 | Device for monitoring the leakage current of a surge arrester A device for monitoring a leakage current of a surge arrester has a measuring element for detecting a leakage current in a leakage current circuit. A filter assembly filters the leakage current in order to extract a third harmonic oscillation which is evaluated by a... | 02/26/2008 |
| 7323852 | Sensing load tap changer (LTC) conditions A load tap changer (LTC) having a plurality of windings is coupled to one of the primary and secondary of a power transformer in order to regulate the output voltage of the transformer. The LTC includes a plurality of taps physically and electrically connected to an... | 01/29/2008 |
| 7310049 | Status indicator A status indicator indicates an operating state, including an electrical malfunction, of an electrical load that is located and controlled from locations remote from a monitoring location. ... | 12/18/2007 |
| 7222518 | Transformer monitoring system An oil-filled transformer monitoring system is provided which calculates an oil temperature of an oil-filled transformer with high precision from a current of the transformer and an ambient temperature. The oil-filled transformer monitoring system of this invention ... | 05/29/2007 |
| 7109877 | Fault monitoring apparatus and method A fault condition monitoring apparatus for use with a fuse cutout includes a housing operable to be supported by the fuse cutout. The housing has first and second contacts operable to make electrical contact with fuse contacts on the fuse cutout when the housing is ... | 09/19/2006 |
| 6972686 | Radiated field detector A testing device is operative to sense or monitor a radiated field emitted by an igniter for heating equipment such as an oil burner and to indicate the detection corresponding to a normal operating state of the igniter. ... | 12/06/2005 |
| 6949934 | Fault-annuciating system for a transformer A preferred embodiment of a transformer includes a core, and a primary and a secondary winding positioned on the core so that the primary and secondary windings are inductively coupled when the primary winding is energized. The transformer also includes a sensor for... | 09/27/2005 |
| 6906630 | Transformer management system and method A transformer management system and method involves using sensors to sense physical quantities associated with the operation of a transformer. Processing circuitry uses the sensed physical quantities to calculate values from mathematical models for representing beha... | 06/14/2005 |
| 6842718 | Intelligent auxiliary cooling system A portable auxiliary cooling system for cooling electrical power transformers is provided with an intelligent controller that is programmable for functioning in a plurality of different operational modes. A plurality of sensors monitor cooling system equipment opera... | 01/11/2005 |
| 6727821 | Apparatus and method for predicting an overload trip for an electrical power transformer An apparatus for monitoring and controlling the operation of an electrical power transformer includes a processor with input transducers for providing to the processor inputs indicative of electrical current in a winding of the transformer and ambient temperature ou... | 04/27/2004 |
| 6714022 | Apparatus and method for cooling power transformers The load current drawn from a power transformer is sensed to determine if and when the load current exceeds a predetermined threshold. The length of time the load current exceeds the threshold is also sensed. By monitoring the excess current flow and the length of t... | 03/30/2004 |
| 6680616 | In-service testing of current transformers A system and method for testing an on-line current transformer is provided. The current transformer includes a primary winding and a secondary winding. An operating current continues to flow through the primary winding during testing of the current transf... | 01/20/2004 |
| 6609079 | Method and arrangement for ascertaining state variables In a method for ascertaining temperatures (tqm, tqh, tom, tok) in an oil-cooled transformer, the transformer terminal voltages (2), the winding currents (3) and the ambient temperature (6) are measured. Furthermore, the status (5) of fans and pumps and th... | 08/19/2003 |
| 6424266 | Apparatus for preventing thermal damage to an electrical power transformer An apparatus for monitoring and controlling the operation of an electrical power transformer includes a processor with input transducers for providing to the processor inputs indicative of electrical current in a winding of the transformer and ambient tem... | 07/23/2002 |
| 6400277 | Monitor for detecting failures of neon sign transformers A monitor for detecting failures in the installation of neon gas sign transformers has an electronic circuit in the transformer compartment to turn the transformer off in the event any failure occurs. The monitor uses a programmed digital micro-controller... | 06/04/2002 |
| 6323655 | Method and device for detecting partial discharges A method and device for detecting partial discharges in an electrical apparatus placed in a tank filled with oil, wherein the tank wall is provided with at least one drain tap. The device includes a probe mounted on a carrier that is movable through the o... | 11/27/2001 |
| 6292069 | Loosely coupled rotary transformer having resonant circuit A loosely coupled rotary transformer includes a resonant circuit, such as a resonating capacitor connected to a power MOS transistor, coupled across the primary coil of the transformer. The resonant circuit is connected and disconnected from the transform... | 09/18/2001 |
| 6052060 | Temperature monitor for electrical switchgear Insulating oil in electric power transmission switchgear such as a load tap changer for a transformer is filtered for removal of accumulated water and carbon particles. The filter and associated circulation pump is usually located in a separate cabinet ex... | 04/18/2000 |
| 6016104 | System for controlling the resistance of a load connected to a transformer An arrangement allowing a definite and reliable determination of a load resistance connected to the secondary side of a transformer includes devices, which measure exclusively the inductance of the transformer on the primary side and signal a load malfunc... | 01/18/2000 |
| 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 |
| 5908453 | Traveling control apparatus for electric vehicles A control apparatus by which a duty ratio in consideration of how energy stored in storage cells is consumed is set to ensure a steady traveling feeling, a regeneration brake which can produce stable braking forces regardless of how storage cells are cons... | 06/01/1999 |
| 5717338 | Method and apparatus for testing television yokes and flyback transformers A method and apparatus for testing flyback transformers counts the number of cycles of a decaying ringing signal generated in a resonant circuit including the secondary winding of the flyback transformer beginning with the second cycle and ending with the... | 02/10/1998 |
| 5710542 | Method of measuring the A.C. current in a conductor in an A.C. power transmission network A method for measuring the current in an AC power transmission network, where a measurement quantity is obtained by means of a current transformer and digital samples are converted. To prevent faulty detection of the current due to a decaying DC component... | 01/20/1998 |
| 5691706 | Transformer leak alarm Insulating oil in electric power transmission devices such as a transformer is filtered for removal of accumulated water and carbon particles. The filter and circulation pump are usually located in a separate cabinet external to the transformer with circu... | 11/25/1997 |
| 5681666 | Light transparent multilayer moisture barrier for electrochemical celltester and cell employing same A light transparent moisture barrier useful for preventing moisture from destroying the effectiveness of a moisture sensitive cell condition tester on an electrochemical cell comprises a plurality of very thin; alternating layers of an inorganic material ... | 10/28/1997 |
| 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 |
| 5546010 | Method for measuring a resistance value in an electrical apparatus The invention relates to a method for measuring a resistance value in a network incorporated in an electrical apparatus, wherein the network has at least two accessible terminals, the network has at least two time constants differing mutually by at least ... | 08/13/1996 |
| 5534853 | Electronic apparatus for measuring the parameters of an oil transformer The invention relates to an electronic apparatus fastened on an oil transformer, which measures with precision, continuously and simultaneously the value of the temperature, of the level of the dielectric liquid contained in the transformer, of the pressu... | 07/09/1996 |
| 5522252 | Device detecting excessive wear of a carbon wiper of an autotransformer A detection device for detecting excessive wear of a carbon brush of an autotransformer includes a winding wound on a toroidal iron core, a shaft secured by the iron core, a rotary arm extending from the shaft with a hole facing the iron core, a copper bl... | 06/04/1996 |
| 5500598 | Apparatus for testing electrical components which have windings The apparatus comprises a plurality of connectors (9, 10, 11, 12 . . .) for connecting to the component to be tested (e.g. a transformer), a signal generator (19), a measuring system (23) and control means (22) which is arranged to control which of the co... | 03/19/1996 |
| 5475371 | Faulted circuit detector having isolated indicator A faulted circuit detector having an electrically isolated and remotely positioned indicator detects fault currents in a monitored conductor. When a fault of a predetermined magnitude is detected, a light pulse is transmitted from the detector to the indi... | 12/12/1995 |
| 5455506 | Method and portable testing apparatus for safely testing an autotransformer for power distribution lines A method and an apparatus are provided for safely testing an autotransformer of power distribution lines which has an identified centre tap ground connector, a primary winding terminal and a secondary winding terminal. The method for safely testing the au... | 10/03/1995 |
| 5276402 | Three-phase transformer testing method and system Three-phase transformer testing method and system enabling convenient performance of ANSI-required checking of polarity and phase-relation and also enabling measurements of core loss, load loss and transformer ratio to be performed conveniently. Only a to... | 01/04/1994 |
| 5200737 | System and method for detecting partial discharge of gas-insulated switchgear A system and method for detecting partial discharge of gas-insulated switchgear wherein a high-frequency component and the fundamental wave component of the voltage applied to the conductor of the gas-insulated switchgear are detected, the zero-cross poin... | 04/06/1993 |
| 5075629 | Partial discharge detecting device for electrical equipments A partial discharge detecting device for transformers includes an antenna disposed in a metallic insulation gas filled tank enclosing a core and coil assembly and a signal processing circuit for processing an output signal from the antenna. The antenna in... | 12/24/1991 |
| 5041817 | Arrangement for the inductive querying of and supplying of power to an isolated circuit having an electrical consuming device An arrangement for the inductive querying of and supplying of power to an isolated circuit having an electrical consuming device. The arrangement uses two isolating transformers each with a read winding to simultaneously compare the resistance of the cons... | 08/20/1991 |
