According to one embodiment, a winding interlayer short-circuit detection apparatus includes a processor configured to perform at least an interlayer short-circuit detecting process to detect, based on a difference between a measurement value of a field current in a field winding of a brushless exciter and a reference value, and based on a difference between a calculated value of an armature reaction voltage induced in the field winding of the brushless exciter and a reference value, a presence or absence of an interlayer short-circuit that may occur in any of the field winding of the brushless exciter, an armature winding of the brushless exciter, and a field winding of a rotary electric machine body.

A method and a system of detecting winding fault during online operation of an electrical machine, said method comprising, acquiring a set of signals from the machine over a period, said set of signals comprising two or more magnetic flux signals, each flux signal obtained from a respective flux sensor positioned on the external surface of the machine; extracting an internal winding fault indicator from the set of signals; comparing the internal winding fault indicator with a baseline indicator; and determining the internal winding fault when the internal winding fault indicator deviates from the baseline indicator by a threshold.

A method and a system of detecting winding fault during online operation of an electrical machine, said method comprising, acquiring a set of signals from the machine over a period, said set of signals comprising two or more magnetic flux signals, each flux signal obtained from a respective flux sensor positioned on the external surface of the machine; extracting an internal winding fault indicator from the set of signals; comparing the internal winding fault indicator with a baseline indicator; and determining the internal winding fault when the internal winding fault indicator deviates from the baseline indicator by a threshold.

Method for determining the behaviour of one electrical or electronic power component (2), with respect to a working limit condition, the method comprising the following operational steps: A. defining one three-dimensional mathematical space (3) of operational parameters of interest for the electrical or electronic power component (2), wherein the coordinates of an n-th point P.sub.n of the three-dimensional mathematical space (3) correspond to specific values of the operational parameters of interest for the electrical or electronic power component (2); B. defining one exploration field (4) of the three-dimensional mathematical space, one working limit condition for the electrical or electronic power component (2) and one set R of response parameters of interest for the electrical or electronic power component (2); C. exploring, said three-dimensional mathematical space (3) by: - the generation of at least one stimulus, determined based on the coordinates of the points P.sub.n of the three-dimensional mathematical space (3) and based on the exploration field (4), - the application of the at least one stimulus, to the at least one electrical or electronic power component (2), and - the detection of one corresponding response to the stimulus thereby applied, from the electrical or electronic power component (2), and based on the response thereby detected, determining, and storing one finite subset of points P.sup.∗.sub.n of said mathematical space (3) among the points P.sub.n of the mathematical space (3), for which that working limit condition of that electronic power component (2) is met; and D. determining one mathematical model that analytically describes the locus of the points P.sup.∗.sub.n of that three-dimensional mathematical space (3) thereby stored, thereby obtaining the locus (5) of the operational parameters that determine a response from said electrical or electronic power component (2) that meets that working limit condition.

Method for determining the behaviour of one electrical or electronic power component (2), with respect to a working limit condition, the method comprising the following operational steps: A. defining one three-dimensional mathematical space (3) of operational parameters of interest for the electrical or electronic power component (2), wherein the coordinates of an n-th point P.sub.n of the three-dimensional mathematical space (3) correspond to specific values of the operational parameters of interest for the electrical or electronic power component (2); B. defining one exploration field (4) of the three-dimensional mathematical space, one working limit condition for the electrical or electronic power component (2) and one set R of response parameters of interest for the electrical or electronic power component (2); C. exploring, said three-dimensional mathematical space (3) by: - the generation of at least one stimulus, determined based on the coordinates of the points P.sub.n of the three-dimensional mathematical space (3) and based on the exploration field (4), - the application of the at least one stimulus, to the at least one electrical or electronic power component (2), and - the detection of one corresponding response to the stimulus thereby applied, from the electrical or electronic power component (2), and based on the response thereby detected, determining, and storing one finite subset of points P.sup.∗.sub.n of said mathematical space (3) among the points P.sub.n of the mathematical space (3), for which that working limit condition of that electronic power component (2) is met; and D. determining one mathematical model that analytically describes the locus of the points P.sup.∗.sub.n of that three-dimensional mathematical space (3) thereby stored, thereby obtaining the locus (5) of the operational parameters that determine a response from said electrical or electronic power component (2) that meets that working limit condition.

A diagnostic method for diagnosing a malfunction of a solenoid valve includes: a) storing reference features of a solenoid current waveform, b) detecting features of the solenoid current waveform during operation of the solenoid valve, c) comparing the reference features with the detected features, d) comparing the pressure value of fluid entering the solenoid valve inlet orifice with a predetermined range of pressure values in the event of deviation between the value of the detected features and the value of the reference features, e) adjusting the pressure value and repeating steps b) and c) in the case of deviation of the pressure value with respect to the pressure value range, and f) generating an alarm signal due to malfunction of the solenoid valve in the event of a deviation between the value of the detected features and the value of the reference and fluid pressure features within the pressure value range.

Provided is a short-circuit detection device configured to detect a short circuit of a field winding wound in a plurality of rotor slots in a rotor of a rotating electric machine, the short-circuit detection device including: a signal conversion unit configured to convert a detection signal in which a circumferential distribution of a magnetic flux of the rotor is detected into an energy equivalent signal corresponding to a circumferential distribution of magnetic energy of the rotor; and a short-circuit detection unit configured to detect a rotor slot in which the short circuit has occurred through use of the energy equivalent signal.

Provided is a short-circuit detection device configured to detect a short circuit of a field winding wound in a plurality of rotor slots in a rotor of a rotating electric machine, the short-circuit detection device including: a signal conversion unit configured to convert a detection signal in which a circumferential distribution of a magnetic flux of the rotor is detected into an energy equivalent signal corresponding to a circumferential distribution of magnetic energy of the rotor; and a short-circuit detection unit configured to detect a rotor slot in which the short circuit has occurred through use of the energy equivalent signal.

A system and method for detecting a phase-to-ground fault in an AC electrical machine operates to receive measurements of three-phase voltages and currents provided to the AC electrical machine, compute at least one of a zero sequence component and a negative sequence component of voltage and current from the three-phase voltages and currents, and calculate a fault severity index (FSI) based on the zero or negative sequence component of voltage and current, so as to identify a phase-to-ground fault in the AC electrical machine. Calculating the FSI further includes determining a total value of the zero or negative sequence current, determining a noise-contributed value of the zero or negative sequence current included in the total value, determining a compensated value of the zero or negative sequence current based on the total value and the noise-contributed value, and calculating the FSI based on the compensated value.

A system and method for detecting a phase-to-ground fault in an AC electrical machine operates to receive measurements of three-phase voltages and currents provided to the AC electrical machine, compute at least one of a zero sequence component and a negative sequence component of voltage and current from the three-phase voltages and currents, and calculate a fault severity index (FSI) based on the zero or negative sequence component of voltage and current, so as to identify a phase-to-ground fault in the AC electrical machine. Calculating the FSI further includes determining a total value of the zero or negative sequence current, determining a noise-contributed value of the zero or negative sequence current included in the total value, determining a compensated value of the zero or negative sequence current based on the total value and the noise-contributed value, and calculating the FSI based on the compensated value.