The Experts below are selected from a list of 31287 Experts worldwide ranked by ideXlab platform
J Penman - One of the best experts on this subject based on the ideXlab platform.
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the detection of inter turn Short Circuits in the stator windings of operating motors
IEEE Transactions on Industrial Electronics, 2000Co-Authors: Gojko Joksimovic, J PenmanAbstract:This paper develops a winding-function-based method for modeling polyphase cage induction motors with inter-turn Short Circuits in the machine stator winding. Analytical consideration which sheds light on some components of the stator current spectra of both healthy and faulty machines is developed. It is shown that, as a result of the nature of the cage rotor, no new frequency components of the line current spectra can appear as a consequence of the fault. Only a rise in some of the frequency components which already exist in the line current spectra of a healthy machine can be observed. An experimental setup comprising a 3 kW delta-connected motor loaded by a generator was used to validate this approach. The experimental results obtained clearly validate the analytical and simulation results.
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the detection of stator and rotor winding Short Circuits in synchronous generators by analysing excitation current harmonics
Opportunities and Advances in International Electric Power Generation International Conference on (Conf. Publ. No. 419), 1996Co-Authors: J Penman, H JiangAbstract:The synchronous generator is a principal elements of the power generation cycle. Its operational condition affects the electricity supply reliability and the power system stability. With modern generators, protection and monitoring equipment are employed routinely to prevent damage. Rotor winding Short Circuits occur relatively frequently and if continuous, can lead to high temperatures and excessive vibration of the rotor resulting in damage to the generator if the fault is not cleared. To detect Shorted turns in the rotor windings, several methods have been used for many years, for example, the airgap search coil technique, the monitoring of circulating stator current in double circuit machines, measurement the rotor shaft voltage, and the recurrent surge oscillograph method. Here, a novel method which looks at the harmonic components present in the generator excitation current is proposed to detect both stator and rotor winding Shorts. Analytical justification of the method is given together with experimental results obtained using two synchronous machines of different ratings, both of which have single circuit stator windings and four pole salient rotors.
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detection and location of interturn Short Circuits in the stator windings of operating motors
IEEE Transactions on Energy Conversion, 1994Co-Authors: J Penman, Howard Sedding, B A Lloyd, W T FinkAbstract:One major cause of motor failures is breakdown of the turn insulation leading to puncture of the groundwall. Early detection of interturn Shorts during motor operation would eliminate consequential damage to adjacent coils and the stator core reducing repair costs and motor outage time. In addition to the benefits gained from early detection of turn insulation breakdown, significant advantages would accrue by locating the faulted coil within the stator winding. Fault location would not only increase the speed of the repair, but would also permit more optimal scheduling of the repair outage. This work was successful in practically implementing a theory to predict changes in the axial leakage flux resulting from stator winding interturn Shorts and in developing an algorithm to locate the position of the faulted coil. An experimental setup consisting of a 200 hp motor loaded by a generator was used to validate this theory. Suitable transducers were developed and installed on this motor. Measurement using this experimental configuration clearly validated the theoretical model. On the basis of this experimental work an instrument to continuously monitor for Shorted turns is under development. >
Zlatko Maljkovic - One of the best experts on this subject based on the ideXlab platform.
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a new method for inter coil Short circuit detection in synchronous machine armature winding
International Review of Electrical Engineering-iree, 2012Co-Authors: Ante Elez, Stjepan Car, Zlatko MaljkovicAbstract:This paper deals with detection of inter-coil Short Circuits in the synchronous machine armature winding, for the machines having the armature winding with coils, based on the analysis of the machines magnetic field. Applying FEM (finite element method) to the generator model, magnetic field wave forms in the machine have been calculated for every point of interest, under correct and faulty conditions. Selection of the stated points has been planned with the intention to reach a correspondence of the points of interest for flux density among the calculated points and points accessible for measuring with Hall sensors in the actual machine. Comparison of results shows changes in magnetic fields in the machine caused by analyzed faults. The results of calculations are confirmed by measurements on a real machine that is altered in a way that it is possible to simulate inter-coil Short Circuits of one or more coil turns of the armature winding. The aim of this study is creation of a contribution to the knowledge portfolio pertaining to detection of rotation machines failures and faults, or, in other words development and improvement of monitoring systems in charge of monitoring and fault detections of rotation machines.
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detection of inter coil Short Circuits in synchronous machine armature winding on the basis of analysis of machine magnetic field
International Conference on Electrical Machines, 2010Co-Authors: Ante Elez, Stjepan Car, Zlatko MaljkovicAbstract:This paper deals with detection of inter-coil Short Circuits in the synchronous machine armature winding, for the machines having the armature winding with coils, based on the analysis of the magnetic field present in the machine. Applying FEM (finite element method) [4] to the generator model, magnetic field wave forms in the machine have been calculated for every point of interest, under correct and faulty conditions. Selection of the stated points has been planned with the intention to reach a correspondence of the points of interest for flux density among the calculated points and points accessible for measuring with Hall sensors in the actual machine. Comparison of results shows changes in magnetic fields in the machine caused by analyzed faults. The results of calculations are confirmed by measurements on a real machine that is altered in a way that it is possible to simulate inter-coil Short Circuits of one or more coil turns of the armature winding. The aim of this study is creation of a contribution to the knowledge portfolio pertaining to detection of rotation machines failures and faults, or, in other words development and improvement of monitoring systems in charge of surveillance of rotation machine condition.
Ante Elez - One of the best experts on this subject based on the ideXlab platform.
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a new method for inter coil Short circuit detection in synchronous machine armature winding
International Review of Electrical Engineering-iree, 2012Co-Authors: Ante Elez, Stjepan Car, Zlatko MaljkovicAbstract:This paper deals with detection of inter-coil Short Circuits in the synchronous machine armature winding, for the machines having the armature winding with coils, based on the analysis of the machines magnetic field. Applying FEM (finite element method) to the generator model, magnetic field wave forms in the machine have been calculated for every point of interest, under correct and faulty conditions. Selection of the stated points has been planned with the intention to reach a correspondence of the points of interest for flux density among the calculated points and points accessible for measuring with Hall sensors in the actual machine. Comparison of results shows changes in magnetic fields in the machine caused by analyzed faults. The results of calculations are confirmed by measurements on a real machine that is altered in a way that it is possible to simulate inter-coil Short Circuits of one or more coil turns of the armature winding. The aim of this study is creation of a contribution to the knowledge portfolio pertaining to detection of rotation machines failures and faults, or, in other words development and improvement of monitoring systems in charge of monitoring and fault detections of rotation machines.
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detection of inter coil Short Circuits in synchronous machine armature winding on the basis of analysis of machine magnetic field
International Conference on Electrical Machines, 2010Co-Authors: Ante Elez, Stjepan Car, Zlatko MaljkovicAbstract:This paper deals with detection of inter-coil Short Circuits in the synchronous machine armature winding, for the machines having the armature winding with coils, based on the analysis of the magnetic field present in the machine. Applying FEM (finite element method) [4] to the generator model, magnetic field wave forms in the machine have been calculated for every point of interest, under correct and faulty conditions. Selection of the stated points has been planned with the intention to reach a correspondence of the points of interest for flux density among the calculated points and points accessible for measuring with Hall sensors in the actual machine. Comparison of results shows changes in magnetic fields in the machine caused by analyzed faults. The results of calculations are confirmed by measurements on a real machine that is altered in a way that it is possible to simulate inter-coil Short Circuits of one or more coil turns of the armature winding. The aim of this study is creation of a contribution to the knowledge portfolio pertaining to detection of rotation machines failures and faults, or, in other words development and improvement of monitoring systems in charge of surveillance of rotation machine condition.
Andrea Albini - One of the best experts on this subject based on the ideXlab platform.
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an improved diagnostic system to detect inter turns Short Circuits in low voltage stator windings
IEEE Workshop on Electrical Machines Design Control and Diagnosis, 2015Co-Authors: Lucia Frosini, Marco Magnaghi, Andrea AlbiniAbstract:In order to detect stator inter-turns Short Circuits in low voltage motors, three variables, which can be easily and non-invasively measured, have been experimentally evaluated with an improved methodology: phase current and stray fluxes measured by a commercial probe in front of the motor and by a custom probe on the body of the motor. The analysis of these variables in the frequency domain examines the characteristic harmonics of this fault, already known in the literature. The experimental tests have been carried out on an induction motor which allows to simulate different percentages of Short circuit in one phase of its stator winding. The diagnostic information provided by the three variables are consistent among them and with respect to previous researches. The custom probe stands out for its most significant diagnostic content and its low cost, therefore it can be considered as the best candidate for applications in industrial environments.
Stjepan Car - One of the best experts on this subject based on the ideXlab platform.
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a new method for inter coil Short circuit detection in synchronous machine armature winding
International Review of Electrical Engineering-iree, 2012Co-Authors: Ante Elez, Stjepan Car, Zlatko MaljkovicAbstract:This paper deals with detection of inter-coil Short Circuits in the synchronous machine armature winding, for the machines having the armature winding with coils, based on the analysis of the machines magnetic field. Applying FEM (finite element method) to the generator model, magnetic field wave forms in the machine have been calculated for every point of interest, under correct and faulty conditions. Selection of the stated points has been planned with the intention to reach a correspondence of the points of interest for flux density among the calculated points and points accessible for measuring with Hall sensors in the actual machine. Comparison of results shows changes in magnetic fields in the machine caused by analyzed faults. The results of calculations are confirmed by measurements on a real machine that is altered in a way that it is possible to simulate inter-coil Short Circuits of one or more coil turns of the armature winding. The aim of this study is creation of a contribution to the knowledge portfolio pertaining to detection of rotation machines failures and faults, or, in other words development and improvement of monitoring systems in charge of monitoring and fault detections of rotation machines.
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detection of inter coil Short Circuits in synchronous machine armature winding on the basis of analysis of machine magnetic field
International Conference on Electrical Machines, 2010Co-Authors: Ante Elez, Stjepan Car, Zlatko MaljkovicAbstract:This paper deals with detection of inter-coil Short Circuits in the synchronous machine armature winding, for the machines having the armature winding with coils, based on the analysis of the magnetic field present in the machine. Applying FEM (finite element method) [4] to the generator model, magnetic field wave forms in the machine have been calculated for every point of interest, under correct and faulty conditions. Selection of the stated points has been planned with the intention to reach a correspondence of the points of interest for flux density among the calculated points and points accessible for measuring with Hall sensors in the actual machine. Comparison of results shows changes in magnetic fields in the machine caused by analyzed faults. The results of calculations are confirmed by measurements on a real machine that is altered in a way that it is possible to simulate inter-coil Short Circuits of one or more coil turns of the armature winding. The aim of this study is creation of a contribution to the knowledge portfolio pertaining to detection of rotation machines failures and faults, or, in other words development and improvement of monitoring systems in charge of surveillance of rotation machine condition.
