Abstract: Embodiments of the disclosure are to evaluation of a phase-resolved partial electrical discharge (PD) of equipment insulation. In one embodiment, a method includes providing Phiqn-arrays by a measurement device configured to detect a PD process in electrical equipment. The electrical equipment can include high voltage insulation. The method further includes associating, by an equipment controller communicatively coupled to the measurement device, at least one Phiqn-pattern present in the Phiqn-arrays with a geometrical shape. The method also includes tracking, by the equipment controller, parameters of the geometrical shape in the Phiqn-arrays. The method also includes determining, by the equipment controller and based on the parameters of the geometrical shape, a discharge intensity associated with the Phiqn-pattern. The method may further include providing, by the equipment controller and based on the discharge intensity, a signal indicative of a condition of the high voltage insulation.

Abstract: A method for measuring a stator core of an electrical machine includes the steps of winding at least one excitation coil around the stator core, applying a discontinuous voltage to the excitation coil(s) to magnetically excite the stator core, and measuring a quantity of the magnetically excited stator core. Further, a corresponding measuring device is disclosed.

Abstract: This disclosure relates to evaluation of a phase-resolved partial electrical discharge (PD) of equipment insulation. In one embodiment, a method includes providing Phiqn-arrays by a measurement device configured to detect a PD process in electrical equipment. The electrical equipment can include high voltage insulation. The method further includes associating, by an equipment controller communicatively coupled to the measurement device, at least one Phiqn-pattern present in the Phiqn-arrays with a geometrical shape. The method also includes tracking, by the equipment controller, parameters of the geometrical shape in the Phiqn-arrays. The method also includes determining, by the equipment controller and based on the parameters of the geometrical shape, a discharge intensity associated with the Phiqn-pattern. The method may further include providing, by the equipment controller and based on the discharge intensity, a signal indicative of a condition of the high voltage insulation.

Abstract: A method for measuring a stator core of an electrical machine includes the steps of winding at least one excitation coil around the stator core, applying a discontinuous voltage to the excitation coil(s) to magnetically excite the stator core, and measuring a quantity of the magnetically excited stator core. Further, a corresponding measuring device is disclosed.

Abstract: An excitation device for high-energy tests of stator cores of electric generators or motors is disclosed. The excitation device includes one or more excitation modules. Each excitation module includes an excitation winding and a power supply configured to drive an excitation current through the excitation winding which contributes to the overall excitation of the stator core. The excitation module further includes a capacitor. The power supply of the excitation module acts as current source at its output.

Abstract: The present invention relates to a partial discharge sensor for a high-voltage insulation monitoring device comprising a housing and located in the housing a measurement circuit for measurement of partial discharges in a high voltage system to be tested and a coupling capacitor having one electrode connected to the measurement circuit and the other electrode to a first high voltage conductor to be connected to a high voltage line of the system to be tested, wherein it further comprises a calibration circuit located in the housing and comprising a calibration capacitor having one electrode connected to the calibration circuit and the other electrode connected to said first or a second high voltage conductor to be connected to a high voltage line.

Abstract: An excitation device for high-energy tests of stator cores of electric generators or motors is disclosed. The excitation device includes one or more excitation modules. Each excitation module includes an excitation winding and a power supply configured to drive an excitation current through the excitation winding which contributes to the overall excitation of the stator core. The excitation module further includes a capacitor. The power supply of the excitation module acts as current source at its output.

Abstract: A device for measuring a magnetic field in an air-gap between a stator and a rotor of an electric machine includes a probe to detect the magnetic field and generate a signal indicative thereof and a display unit for the signal. The probe includes a plurality of sensors.

Abstract: The invention relates to a method for detecting rubbing and/or contact points on machines with rotating parts. The rotating parts form an electrical coaxial system with respect to the stationary parts of such a machine, in which system electrical voltage pulses are propagated at a characteristic speed because of the small distance between the rotating and the stationary part. Short electrical voltage pulses and/or continuous alternating voltage signals are applied between the rotating part and the stationary part, an electrical connection occurring between the rotating and the stationary part at a rubbing and/or contact point. In order to locate this rubbing and/or contact point as a point of electrical discontinuity, the period of time until the reflected pulses arrive is measured along the path of propagation of the electrical voltage pulses and/or of the continuous alternating voltage signals.

Abstract: The present invention relates to a partial discharge sensor for a high-voltage insulation monitoring device comprising a housing and located in the housing a measurement circuit for measurement of partial discharges in a high voltage system to be tested and a coupling capacitor having one electrode connected to the measurement circuit and the other electrode to a first high voltage conductor to be connected to a high voltage line of the system to be tested, wherein it further comprises a calibration circuit located in the housing and comprising a calibration capacitor having one electrode connected to the calibration circuit and the other electrode connected to said first or a second high voltage conductor to be connected to a high voltage line.

Abstract: The transducer is equipped with motion sensors for measuring the motion of its membrane and current sensors for measuring the current through the voice coil. The signals generated by the motion sensors are used for the control of low-frequency spectral components and the signals generated by the current sensors are used for control of the high-frequency spectral components of the membrane's motion.

Abstract: The loudspeaker system uses an inner transducer for pressure control in the closed loudspeaker housing to simulate the desired baffle properties. The speed of the membrane of the inner transducer is either proportional to the derivative of the pressure, or proportional to the intergral of pressure changes, or comprises summands proportional to the pressure, to the pressure's derivative and to the pressure's intergral.

Abstract: The device for buoyancy is intended to be used by scuba divers. It allows the adjustment of its buoyancy and keeps this buoyancy constant even at changing water pressure. Its weight is low. The device works with a mechanism for pressure control. The controller keeps the pressure difference between the inside and the outside of the tank constant. The walls of the tank are expandable to allow the adjustment of the displaced volume.