Abstract: A primary resonant coil (22) and a secondary resonant coil (23) are different in the proposed improved coreless power transformer design, wherein the differences between the two resonant coils are achieved in two ways: (1) in the first difference, the two resonant coil windings are made to be different; for example, to have different number of turns, turn spacing and/or different wire sizes, and (2) the second difference is with the capacitance values of the two parallel capacitors each used to resonate their respective coils.

Abstract: A transformer system is provided that includes an ensemble of four magnetically coupled coils having fixed spacing geometry. The ensemble of four magnetically coupled coils includes a load coil, a primary resonant coil, a drive coil and a secondary resonant coil. All coils are coupled in the transformer system, but the first resonant coil is highly coupled with the drive coil so that the resonant coil can receive energy from the drive coil and the second resonant coil is highly coupled to the load coil so that the load coil can extract energy efficiently from the second resonant coil. Additionally, the primary resonant coil may be at least partially nested coaxially inside the drive coil and/or the secondary resonant coil may be at least partially nested coaxially inside the load coil.

Abstract: A transformer system is provided that includes four magnetically coupled coils having fixed spacing geometry. The four magnetically coupled coils include a drive coil that produces magnetic fields and a load coil. All coils are coupled in the transformer system, but the first resonant coil is highly coupled with the drive coil so that the resonant coil can receive energy from the drive coil and the second resonant coil is highly coupled to the load coil so that the load coil can extract energy efficiently from the second resonant coil.

Abstract: A transformer system is provided that includes an ensemble of four magnetically coupled coils having fixed spacing geometry. The ensemble of four magnetically coupled coils includes a load coil, a primary resonant coil, a drive coil and a secondary resonant coil. All coils are coupled in the transformer system, but the first resonant coil is highly coupled with the drive coil so that the resonant coil can receive energy from the drive coil and the second resonant coil is highly coupled to the load coil so that the load coil can extract energy efficiently from the second resonant coil. Additionally, the primary resonant coil may be at least partially nested coaxially inside the drive coil and/or the secondary resonant coil may be at least partially nested coaxially inside the load coil.

Abstract: A transformer system is provided that includes four magnetically coupled coils having fixed spacing geometry. The four magnetically coupled coils include a drive coil that produces magnetic fields and a load coil. All coils are coupled in the transformer system, but the first resonant coil is highly coupled with the drive coil so that the resonant coil can receive energy from the drive coil and the second resonant coil is highly coupled to the load coil so that the load coil can extract energy efficiently from the second resonant coil.

Abstract: A transformer system is provided that includes four magnetically coupled coils having fixed spacing geometry. The four magnetically coupled coils include a drive coil that produces magnetic fields and a load coil. A first resonant coil is magnetically coupled to the drive coil producing energy that is stored by the first resonant coil. A second resonant coil is magnetically coupled to the first resonant coil to propagate the energy stored in the first resonant coil to the second resonant coil without using a magnetic core. The second resonant coil is then magnetically coupled to the load coil where the energy is transferred to the load coil.

Abstract: A transformer system is provided that includes four magnetically coupled coils having fixed spacing geometry. The four magnetically coupled coils include a drive coil that produces magnetic fields and a load coil. A first resonant coil is magnetically coupled to the drive coil producing energy that is stored by the first resonant coil. A second resonant coil is magnetically coupled to the first resonant coil to propagate the energy stored in the first resonant coil to the second resonant coil without using a magnetic core. The second resonant coil is then magnetically coupled to the load coil where the energy is transferred to the load coil.

Abstract: A system is disclosed for monitoring the quality of an internal fluid contained in an apparatus. The system includes a pulse input port, a test gap unit, and a reactive impedance unit. The pulse input port receives a test pulse input signal from a pulse source. The test gap unit provides a test voltage across a test gap while the test gap unit is immersed in the internal fluid within the apparatus. The test gap unit has an inherent capacitance. The reactive impedance unit provides an impedance in series with the inherent capacitance of the test gap unit that restricts transfer of current to the test gap, and is coupled to the pulse input port and coupled to the test gap unit. The impedance unit includes a first resistor unit in parallel with a capacitor unit.

Abstract: The invention relates to sensors for detecting a time-varying current by employing a plurality of coils with separate windings, disposed on separate toroidal cores, that are placed in close proximity of each other so that each coil responds independently to the same current. The current produces a time-varying magnetic field which in turn induces a plurality of voltages across the coils that can be combined to provide a resultant signal. Some embodiments of the invention employ coils with opposite windings to obtain signals with opposite phases and combine these signals through differential detection means to obtain a combined signal. One aspect of the invention relates to production of a wide-band or a selectable band-width sensor by preparing at least one coil to be dissimilar with respect to the others. In addition, the invention provides provisions for easy calibration of the sensor.

Abstract: A system is disclosed for monitoring the quality of an internal fluid contained in an apparatus. The system includes a pulse input port, a test gap unit, and a reactive impedance unit. The pulse input port receives a test pulse input signal from a pulse source. The test gap unit provides a test voltage across a test gap while the test gap unit is immersed in the internal fluid within the apparatus. The test gap means has an inherent capacitance. The reactive impedance unit provides an impedance in series with the inherent capacitance of the test gap unit that restricts transfer of current to the test gap, and is coupled to the pulse input port and coupled to the test gap unit.

Abstract: The invention relates to sensors for detecting a time-varying current by employing a plurality of coils with separate windings, disposed on separate toroidal cores, that are placed in close proximity of each other so that each coil responds independently to the same current. The current produces a time-varying magnetic field which in turn induces a plurality of voltages across the coils that can be combined to provide a resultant signal. Some embodiments of the invention employ coils with opposite windings to obtain signals with opposite phases and combine these signals through differential detection means to obtain a combined signal. One aspect of the invention relates to production of a wide-band or a selectable band-width sensor by preparing at least one coil to be dissimilar with respect to the others. In addition, the invention provides provisions for easy calibration of the sensor.

Abstract: A system is disclosed for monitoring electrical partial discharge signals in electrical power apparatus. The apparatus includes a housing and a plurality of openings in the housing through which electrical power may pass via electrical power contact units. The system includes a plurality of sensor units, each being in communication with, and associated with, an electrical power contact unit at each opening in the housing. The sensor units are for sensing partial discharge signals at each opening in the housing and for producing sensor output signals. The system also includes a control unit for simultaneously and synchronously receiving the sensor output signals over an interval of time, and produces simultaneous synchronous output signals. The system also includes a processing unit for processing the simultaneous synchronous output signals.

Abstract: The invention relates to sensors for detecting a time-varying current by employing a plurality of coils with separate windings, disposed on separate toroidal cores, that are placed in close proximity of each other so that each coil responds independently to the same current. The current produces a time-varying magnetic field which in turn induces a plurality of voltages across the coils that can be combined to provide a resultant signal. Some embodiments of the invention employ coils with opposite windings to obtain signals with opposite phases and combine these signals through differential detection means to obtain a combined signal. One aspect of the invention relates to production of a wide-band or a selectable band-width sensor by preparing at least one coil to be dissimilar with respect to the others. In addition, the invention provides provisions for easy calibration of the sensor.

Abstract: A system is disclosed for monitoring electrical partial discharge signals in electrical power apparatus. The apparatus includes a housing and a plurality of openings in the housing through which electrical power may pass via electrical power contact units. The system includes a plurality of sensor units, each being in communication with, and associated with, an electrical power contact unit at each opening in the housing. The sensor units are for sensing partial discharge signals at each opening in the housing and for producing sensor output signals. The system also includes a control unit for simultaneously and synchronously receiving the sensor output signals over an interval of time, and produces simultaneous synchronous output signals. The system also includes a processing unit for processing the simultaneous synchronous output signals.

Abstract: Electrically insulating gaseous media of unexpectedly high dielectric strength comprised of mixtures of two or more dielectric gases are disclosed wherein the dielectric strength of at least one gas in each mixture increases at less than a linear rate with increasing pressure and the mixture gases are present in such proportions that the sum of their electrical discharge voltages at their respective partial pressures exceeds the electrical discharge voltage of each individual gas at the same temperature and pressure as that of the mixture.