The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Peng Wang - One of the best experts on this subject based on the ideXlab platform.
-
Impact of impulse voltage frequency on the partial discharge characteristic of electric vehicles Motor Insulation
Engineering Failure Analysis, 2020Co-Authors: Shakeel Akram, Peng Wang, Kai Zhou, M. Tariq Nazir, M. Shoaib Bhutta, Haider HussainAbstract:Abstract The urgent need for electric vehicles is the leading research to safer operation of electric Motors on high frequency impulsive voltages. For low voltage electric vehicles partial discharge (PD) inception voltage tests under impulse voltage waveforms are desired. However, measuring PD using repetitive impulse waveforms is critical in selecting generators with appropriate parameters to increase PD detection sensitivity. Here, we report on PD characteristics for such kind of voltage waveforms, demonstrated with the high frequency and thermal impact on different types of Motor Insulation models. The increasing frequency of impulsive voltages tends to result in PD activities with low magnitude and short delay times. In this case, some PD pulses are missed because the PD and disturbance pulses produced by power electronic devices will likely overlap. Therefore, these parameters are carefully considered to evaluate the Insulation performance of EV Motors.
-
Temperature effects on PD statistics and endurance of inverter-fed Motor Insulation under repetitive square wave voltages
2016 IEEE Electrical Insulation Conference (EIC), 2016Co-Authors: Peng Wang, Jian Wang, Hongying Xu, Andrea Cavallini, Gian Carlo MontanariAbstract:To study the influence of temperature on partial discharge (PD) statistics and endurance of inverter-fed Motor Insulation, experiments were carried out focusing on enameled wires tested under bipolar repetitive square wave voltages at different temperatures. The PD pattern, delay time, amplitude and life were obtaiaed according to a large amount of test results. Experimental results show that the influence of temperature on PD features depends significantly on the voltage frequency. At low frequency, higher temperature will give rise to more PD events with longer delay time and higher magnitude. At higher frequencies the behavior is significantly different, and the influence of temperature on PD features can be neglected. The endurance test results performed at 10 kHz indicate that, at ambient temperature, PD would be the dominant factor causing Insulation breakdown, while at high temperature, the thermal aging plays an important role on the breakdown process and time.
-
Comparative study of PD characteristics for inverter-fed Motor Insulation under sinusoidal and repetitive square wave voltage conditions
2016 IEEE International Conference on High Voltage Engineering and Application (ICHVE), 2016Co-Authors: Peng Wang, Jian Wang, Hongying Xu, Kai Zhou, Qun ZhouAbstract:The partial discharge (PD) test system is setup based on ultra-high frequency technologies in order to study PD characteristics for inverter-fed Motor Insulation under both sinusoidal and repetitive square wave voltage conditions. Resorting to the system, PD tests are performed on single discharge models made out of enameled wires used in low-voltage inverter-fed Motor Insulation under sinusoidal and repetitive square wave voltages with 200 ns rise times. Experimental results show that repetitive square wave and sinusoidal voltages having same peak-to-peak voltage and frequency can produce PD with significantly different magnitude, phase, and energy distribution as well as endurance lifetime. The PD magnitude and Insulation endurance under repetitive square wave voltages show seven times higher and three times shorter than those obtained at sinusoidal voltages. Accordingly, when performing Insulation evaluation on inverter-fed Motors according to standards released by International Electrotechnical Commission, it is recommended to use repetitive square wave voltages and the influence of square wave voltage parameters on PD and endurance test results should be considered carefully.
-
The effect of impulsive voltage rise time on Insulation endurance of inverter-fed Motors
2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials (ICPADM), 2015Co-Authors: Peng Wang, Andrea Cavallini, Gian Carlo MontanariAbstract:Endurance tests under repetitive impulse voltages should be performed on inverter-fed Motor Insulation to evaluate its Insulation performance according to the technical specification (TS) released by the International Electrical Commission (IEC), i.e. IEC TS 60034-18-42. To simplify testing procedures in the application, the TS allows life tests to be performed under sinusoidal waveform, as it assumes that sinusoidal and impulsive voltages will provide comparable results if they have same peak-to-peak voltage and frequency. However, we have found that voltage rise time can have significant effect on PD features in both time and frequency domains, so that if PD are deemed the cause of accelerated aging, rise time must be taken into account and sinusoidal waveform may be not the best choice for accelerated aging procedures which resemble the real stress experienced in service by Insulation systems of rotating machines controlled by Pulse Width Modulation (PWM). This study aims at summarize the effect of impulsive voltage rise time on Insulation life based on endurance tests on crossed enameled wires used for type I Motors and turn/turn Insulation for Type II Motors. Repetitive voltages of 6 rise times (i.e. 50 ns, 200 ns, 1 μs, 16 μs, 200 μs and 500 μs, sinusoidal voltage with same peak-to-peak voltage and frequency) and 3 rise times (i.e. 150 ns, 2 μs and sinusoidal voltage with same peak-to-peak voltage and frequency) are used in the endurance tests on Type I and Type II Motor Insulation, respectively. Statistical analysis indicate that, due to the different PD features caused by the impulsive voltage rise time, impulsive voltage rise time can have significant effect on Insulation lifetime. Accordingly, when performing endurance tests on high-voltage inverter-fed Motor Insulation, the rise time influence on final life of inverter-fed Motor Insulation should be carefully considered.
Erik Limpaecher - One of the best experts on this subject based on the ideXlab platform.
-
Low-cost, SCR-based premium power quality variable speed drive technology
Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition 2003. APEC '03., 2003Co-Authors: D. Hammell, Mariejeanne Holveck, Erik LimpaecherAbstract:A unique variable speed drive topology is presented. This topology has been shown to use silicon controlled rectifier switches without commutation circuitry at a frequency of 2 kHz to produce input and output waveforms with current total harmonic distortion below 3%. Furthermore, the voltage rise on the output is 1.2 v//spl mu/s without inductive filtering, which preserves Motor Insulation and bearing life. The topology is low cost due to its minimal switching complexity.
Dhananjay R. Tutakne - One of the best experts on this subject based on the ideXlab platform.
-
Fuzzy Logic-based Electrothermal Life Model for Inverter-fed Induction Motor Insulation
Electric Power Components and Systems, 2015Co-Authors: Triloksingh G. Arora, Mohan V. Aware, Dhananjay R. TutakneAbstract:AbstractPulse width modulated adjustable speed drives used in industries lead to significant advantages in terms of performance, size, and efficiency. But, the output voltage and the current waveforms become non-sinusoidal leading to an increase in voltage and thermal stresses. This results into accelerated Insulation aging and premature failure of the Motors. With multiple stresses, the life models for insulating materials become complex and ambiguous. This article presents the fuzzy logic application to derive an electrothermal life model to investigate the synergic effects of voltage and thermal stresses on intrinsic aging of inverter-fed induction Motor Insulation. Three parameters, viz. voltage stress factor, waveform slope stress factor, and spike frequency factor, are proposed to describe the Insulation stresses for pulse width modulated voltages. These parameters are computed from the experimental results at different switching frequencies and are used in fuzzy logic-based life estimation algorith...
-
Effect of pulse width modulated voltage on induction Motor Insulation
2012 7th IEEE Conference on Industrial Electronics and Applications (ICIEA), 2012Co-Authors: Triloksingh G. Arora, Mohan V. Aware, Dhananjay R. TutakneAbstract:Pulse-width modulated adjustable frequency drives are extensively used in the industries for control of induction Motors. It has led to significant advantages in terms of the performance, size, and efficiency of variable speed Motor controls but the applied voltage and current waveforms become non sinusoidal. These non sinusoidal voltage and current waveforms result into voltage & current peaks, voltage transients and increased harmonics. Voltage peaks and voltage transients increase the Insulation stress. Current peaks increase the thermal stress in the Insulation. Voltage harmonics increase dielectric and core losses. The increased thermal and voltage stress result into accelerated Insulation aging; hence life of the Motor is reduced. Paper presents the effect of this voltage overshoot on the Insulation of three-phase induction Motors. A comparison between PWM drive and conventional sinusoidal voltage is presented by experimental results. The results compare quantitatively the Insulation stress parameters due to PWM drive & sinusoidal voltage and current for the Motor. The results can be used to estimate the accelerated Insulation ageing due to PWM drive in three-phase induction Motors.
D. Hammell - One of the best experts on this subject based on the ideXlab platform.
-
Low-cost, SCR-based premium power quality variable speed drive technology
Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition 2003. APEC '03., 2003Co-Authors: D. Hammell, Mariejeanne Holveck, Erik LimpaecherAbstract:A unique variable speed drive topology is presented. This topology has been shown to use silicon controlled rectifier switches without commutation circuitry at a frequency of 2 kHz to produce input and output waveforms with current total harmonic distortion below 3%. Furthermore, the voltage rise on the output is 1.2 v//spl mu/s without inductive filtering, which preserves Motor Insulation and bearing life. The topology is low cost due to its minimal switching complexity.
Gian Carlo Montanari - One of the best experts on this subject based on the ideXlab platform.
-
Temperature effects on PD statistics and endurance of inverter-fed Motor Insulation under repetitive square wave voltages
2016 IEEE Electrical Insulation Conference (EIC), 2016Co-Authors: Peng Wang, Jian Wang, Hongying Xu, Andrea Cavallini, Gian Carlo MontanariAbstract:To study the influence of temperature on partial discharge (PD) statistics and endurance of inverter-fed Motor Insulation, experiments were carried out focusing on enameled wires tested under bipolar repetitive square wave voltages at different temperatures. The PD pattern, delay time, amplitude and life were obtaiaed according to a large amount of test results. Experimental results show that the influence of temperature on PD features depends significantly on the voltage frequency. At low frequency, higher temperature will give rise to more PD events with longer delay time and higher magnitude. At higher frequencies the behavior is significantly different, and the influence of temperature on PD features can be neglected. The endurance test results performed at 10 kHz indicate that, at ambient temperature, PD would be the dominant factor causing Insulation breakdown, while at high temperature, the thermal aging plays an important role on the breakdown process and time.
-
The effect of impulsive voltage rise time on Insulation endurance of inverter-fed Motors
2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials (ICPADM), 2015Co-Authors: Peng Wang, Andrea Cavallini, Gian Carlo MontanariAbstract:Endurance tests under repetitive impulse voltages should be performed on inverter-fed Motor Insulation to evaluate its Insulation performance according to the technical specification (TS) released by the International Electrical Commission (IEC), i.e. IEC TS 60034-18-42. To simplify testing procedures in the application, the TS allows life tests to be performed under sinusoidal waveform, as it assumes that sinusoidal and impulsive voltages will provide comparable results if they have same peak-to-peak voltage and frequency. However, we have found that voltage rise time can have significant effect on PD features in both time and frequency domains, so that if PD are deemed the cause of accelerated aging, rise time must be taken into account and sinusoidal waveform may be not the best choice for accelerated aging procedures which resemble the real stress experienced in service by Insulation systems of rotating machines controlled by Pulse Width Modulation (PWM). This study aims at summarize the effect of impulsive voltage rise time on Insulation life based on endurance tests on crossed enameled wires used for type I Motors and turn/turn Insulation for Type II Motors. Repetitive voltages of 6 rise times (i.e. 50 ns, 200 ns, 1 μs, 16 μs, 200 μs and 500 μs, sinusoidal voltage with same peak-to-peak voltage and frequency) and 3 rise times (i.e. 150 ns, 2 μs and sinusoidal voltage with same peak-to-peak voltage and frequency) are used in the endurance tests on Type I and Type II Motor Insulation, respectively. Statistical analysis indicate that, due to the different PD features caused by the impulsive voltage rise time, impulsive voltage rise time can have significant effect on Insulation lifetime. Accordingly, when performing endurance tests on high-voltage inverter-fed Motor Insulation, the rise time influence on final life of inverter-fed Motor Insulation should be carefully considered.