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Öğe Analysis of Stator Inter-turn Short-circuit Fault Signatures for Inverter-fed Permanent Magnet Synchronous Motors(Ieee, 2016) Cira, Ferhat; Arkan, Muslum; Gumus, Bilal; Goktas, TanerIt is quite important to detect stator short-circuit fault, which is the most common fault type, at incipient stage. It is possible to carry out fault detection using Motor Current Signature Analysis (MCSA) method. In this study, stator current and voltage space vectors of PMSMs were analyzed with MCSA under various load torque, speed and fault percentages conditions. The Negative & positive harmonics were obtained by applying Fast Fourier Transform (FFT) to space vectors of stator current and voltage. It is suggested that by using the obtained fault signatures, stator inter-turn fault estimation can be achieved accurately. The results of comprehensive analysis carried out under various load torque and speed conditions show that characteristics fault signatures are both present in the current and the voltage space vectors spectra.Öğe Broken Rotor Bar Fault Monitoring based on Fluxgate Sensor Measurement of Leakage Flux(Ieee, 2017) Goktas, Taner; Arkan, Muslum; Mamis, M. Salih; Akin, BilalBroken rotor bar fault in induction motors significantly affects the motor dynamic performance and increases the mechanical oscillations in torque and speed. Motor current signature analysis has widely been used to detect such fault, yet it has some shortcomings due to motor topology, stator winding and load type dependencies. In this paper, radial leakage flux which contains most critical fault related information is analyzed using a fluxgate sensor to detect broken bar fault in induction motors (IMs). The 2D-Time Stepping Finite Element Method (2D-TSFEM) is used to analyze fault patterns in leakage flux. A 2-Dimensional (2D) finite element analysis and experimental results show that using leakage flux can provide superior and more reliable results than classical motor stator current analysis in IMs.Öğe A Comparative Study of Current, Vibration and Stray Magnetic Flux Based Detection for Parallel Misalignment Fault in Induction Motors(Ieee, 2021) Goktas, Taner; Arkan, Muslum; Gurusamy, V.The misalignment fault is commonly caused by incorrect shaft positions between motor and load in electrical machines. It affects the mechanical symmetry of machine and thus causes mechanical oscillation on the shaft. In this paper, the parallel misalignment fault is analyzed based on stator current, vibration and stray flux in induction motors (IMs). The three-axis vibration sensor and an integrated flux sensor are used in order to stream vibration and stray flux for diagnostics process, respectively. The comparative results between stator current, vibration and stray flux are presented. Experimental results show that stator current and vibration-based analyses provide highly reliable results than stray flux for parallel misalignment fault. It is also shown that the proposed signatures in current and vibration vary very little with respect to load and motor drive type. Moreover, Multilayer Perceptron (MLP) based machine learning algorithm using vibration and stator current is carried out and it has excellent performance in the automatic detection of parallel misalignment fault.Öğe Design and development of travelling-wave-frequency-based transmission line fault locator using TMS320 DSP(Inst Engineering Technology-Iet, 2019) Arkan, Muslum; Akmaz, Duzgun; Mamis, Mehmet S.; Tagluk, Mehmet EminThe authors use a TMS320 digital signal processor (TMS320-DSP) to determine fault instants and estimate their location in real time in a laboratory environment. The fault instant is determined via examining the instantaneous differential changes in the line currents. After the fault is detected, the fault location is determined by processing the time-domain transient current waves. First, the travelling-wave frequency is determined by application of the fast Fourier transform to the positive-sequence-component line current after the fault, and subsequently, the fault location is estimated by utilising this frequency. The alternative transients programme (ATP)-electromagnetic transient programme is used to simulate the line currents and create short-circuit fault conditions. Furthermore, LabVIEW software and a National Instruments data acquisition board are used to transform the line currents obtained through the ATP programme into analogue signals. The TMS320-DSP determines the fault in real time and estimates the fault location using the completed software and analogue input signals. Their results indicate that the prototype device designed with the use of the TMS320-DSP is suitable for real-time fault detection.Öğe Design, Simulation and Application of Buck Converter with Digital PI Controller(2021) Sucu, Hasan; Goktas, Taner; Arkan, MuslumIn this paper, a dc-dc buck converter with digital PIcontrolled is analyzed and designed considering all design parameters such as inductance current variation, output voltage ripple etc. The designed dc-dc buck converter provides stable output voltage against to load changes and output voltage variations. Buck converter control method relies on voltage mode controlled PWM (Pulse width Modulation) with digital PI (Proportional Integral) controller. The design criteria, operating mode selection, suitable material selection, etc. of low cost and high-performance buck converter are explained in detail. Finally, the designed converter is carried out experimentally and the experimental results shows the effectiveness of designed converter under different load profiles.Öğe Detecting Fault Type and Fault Location in Power Transmission Lines by Extreme Learning Machines(Ieee, 2015) Tagluk, M. Emin; Mamis, Mehmet Salih; Arkan, Muslum; Ertugrul, Omer FarukImportance of supplying qualified and undisturbed electricity is increasing day by day. Therefore, detecting fault, fault type and fault location is a major issue in power transmission system in order to prevent power delivery system security. In previous studies, we observed that faults can be easily determined by extreme learning machine (ELM) and the aim of this study is to determine applicability of ELM in fault type, zone and location detection. 8 different feature sets were exacted from fault data that produced by ATP and these features were assessed by 15 different classifier and 5 different regression method. The results showed that ELM can be employed for detecting fault types and locations successfully.Öğe Detection of Rotor Bar Fault through Stray Flux Based Analytical Signal Angular Fluctuation Method(Ieee, 2023) Goktas, Taner; Arkan, MuslumStray flux analysis has increasing trend to monitor the machine condition including fault diagnosis. In this paper, the rotor bar fault is detected through the Stray Flux based Analytical Signal Angular Fluctuation (SF-ASAF) method in induction motors (IMs). For this purpose, the stray flux is collected from the vicinity of motor frame and analytical signal of stray flux is calculated using Hilbert Transform (HT). Then, angular fluctuation of obtained signal is utilized to see the harmonic content of stray flux-analytical signal. It is shown that there are some effective signals such as fs-3sfs, 2sfs to detect rotor bar fault in stray flux based analytical signal angular fluctuation spectrum. The presented 2D- FEM based simulation and experimental results prove that the Stray Flux based Analytical Signal Angular Fluctuation (SF-ASAF) method can provide superior and reliable results rather than classical stray flux analysis in induction motors.Öğe Detection of rotor fault in three-phase induction motor in case of low-frequency load oscillation(Springer, 2015) Goktas, Taner; Arkan, Muslum; Ozguven, Omer FarukThis paper proposes a method for the separation of broken rotor bar failure and low-frequency load fluctuation in line-fed three-phase induction motor. In practice, the presence of load fluctuation at has the same effect on a stator current of induction motor as a broken rotor bar fault. In such cases, the detection of broken rotor bar failure becomes difficult. To discern rotor fault and load oscillations, the analytical signal angular fluctuation (ASAF) method, which is a combination of Hilbert transform and the space vector angular fluctuation method, is used. The presented experimental results prove that low-frequency load oscillation and rotor fault can reliably be discriminated using the ASAF signal spectrum.Öğe Detection of Stator Winding Inter-Turn Short Circuit Faults in Permanent Magnet Synchronous Motors and Automatic Classification of Fault Severity via a Pattern Recognition System(Springer Singapore Pte Ltd, 2016) Cira, Ferhat; Arkan, Muslum; Gumus, BilalIn this study, automatic detection of stator winding inter-turn short circuit fault (SWISCFs) in surface-mounted permanent magnet synchronous motors (SPMSMs) and automatic classification of fault severity via a pattern recognition system (PRS) are presented. In the case of a stator short circuit fault, performance losses become an important issue for SPMSMs. To detect stator winding short circuit faults automatically and to estimate the severity of the fault, an artificial neural network (ANN)-based PRS was used. It was found that the amplitude of the third harmonic of the current was the most distinctive characteristic for detecting the short circuit fault ratio of the SPMSM. To validate the proposed method, both simulation results and experimental results are presented.Öğe Diagnosis of Broken Rotor Fault in Inverter-Fed IM by Using Analytical Signal Angular Fluctuation(Ieee, 2014) Goktas, Taner; Arkan, MuslumThe aim of this paper is to detect broken rotor bar fault at the presence of low frequency load torque oscillation in inverter-fed induction motors. The low frequency load torque oscillation in induction motor may sometimes have the same effect as broken rotor bar fault on the stator current. Especially, when load torque oscillation frequency is close to twice the slip frequency, additional processing need to be done to separate these two effects from each other. To discern these two effects, Analytical Signal Angular Fluctuation (ASAF) spectrum is used. Experimental results are presented for separating broken rotor bar fault from low frequency load torque oscillation.Öğe Discerning broken rotor bar failure from low-frequency load torque oscillation in DTC induction motor drives(Sage Publications Ltd, 2018) Goktas, Taner; Arkan, MuslumThis paper proposes a method for separation of broken rotor bar failures from low-frequency load torque oscillation in direct torque control (DTC) induction motor drives by using v(q) voltage and i(q) current components' spectra. The effect of load torque oscillation should be considered in induction motor drives for reliable broken bar fault detection. Induction machine drivers are run in DTC mode to control its torque and speed. In practice, the presence of load torque fluctuation may sometimes cause false positive alarms on stator current spectrum. However, discerning of broken rotor bar failure from low-frequency load variation for DTC drives remains unexplored. Experimental results show that by using the proposed method broken rotor bar failure can be reliably detected in the presence of low-frequency load torque oscillation in DTC induction motor drives.Öğe Discriminating of Rotor Fault and Low Frequency Load Torque Oscillation Using Motor Square Current Signature Analysis(Ieee, 2018) Goktas, Taner; Arkan, MuslumThis paper proposes a method to discern broken bar rotor fault from low frequency load torque oscillation in induction motors. If a motor is subjected to load fluctuation, the sideband components show up in phase current and they can exhibit similar behavior that of broken bar which leads misleading diagnostics. Thus, broken rotor bar and load oscillation related harmonics may sometimes overlap in the same spot. In this study, Motor Square Current Signature Analysis (MSCSA) method is used to detect broken rotor bar fault when load torque oscillation frequency overlaps with that of broken bar fault. This method is quite simple, but effective for false positive indication. The 2D-FEM simulations and experiments are carried out to prove the efficacy of proposed method. Based on the presented results, it is shown that broken bar related signatures such as 4f(s)-2ksf(s) do exist, whereas there is no load oscillation related signatures at the sidebands of 4f(s) in the square of phase current spectrum.Öğe Fault location determination for transmission lines with different series-compensation levels using transient frequencies(Tubıtak scıentıfıc & technıcal research councıl turkey, ataturk bulvarı no 221, kavaklıdere, ankara, 00000, turkey, 2017) Akmaz, Duzgun; Mamis, Mehmet Salih; Arkan, Muslum; Tagluk, Mehmet EminIn this paper, based on the theory of traveling waves, the fault distances on long transmission lines with various series-compensation levels are determined using transient current and voltage frequencies. Transmission lines with series compensation are modeled using Alternative Transients Program software with frequency-dependent effects on the line included in the simulation. The transient current and voltage signals are obtained from the model. A fast Fourier transform is used for frequency-domain conversion and fault location is estimated from the frequencies of fault-generated harmonics in the transient spectrum. The algorithm is implemented in MATLAB. To investigate the effect of compensation on accuracy, the results are obtained for different series-compensation levels. The undesirable source-inductance effect is removed and estimation accuracy is further improved using a waveform-relaxation method. The method is found to be successful in determining fault location on series-compensated transmission lines. The effects of the compensation level, fault resistance, and phase angle are investigated.Öğe Fault Location on Series Compensated Power Transmission Lines Using Transient Spectrum(Ieee, 2015) Akmaz, Duzgun; Mamis, Mehmet Salih; Arkan, Muslum; Tagluk, M. EminNowadays sustainability and quality of energy have gained more importance. Power outages due to failures particularly cause interruption of production at industrial facilities may lead to loss of manpower and resources. One of the major causes of power outages in the power system is the short-circuit faults occurring in transmission lines. The most important requirement to clear the fault in a short time is to estimate the fault location quickly and accurately. In this study, fault location is determined in series compensated power transmission lines utilizing transient frequency spectrum. It has been shown that the method is suitable for series compensated lines.Öğe Lightning surge analysis of Faraday cage using alternative transient program-electromagnetic transients program(Inst Engineering Technology-Iet, 2016) Mamis, Mehmet Salih; Keles, Cemal; Arkan, Muslum; Kaya, RamazanLightning surge analysis of protective structures is significant for the design of system. However, simulation models are limited. In this study, a Faraday cage with four air terminals and 2 x 6 grounding rods built to protect a switchyard control building in a 380 kV substation is simulated in alternative transient program for the analysis of lightning surges. Distributed line modelling is used for cage conductors. Down conductors are represented by considering non-uniform variation of the conductor parameters. Current waveforms through the system and voltages at some critical points after a lightning stroke are computed. The traditional lightning parameters needed in structural protection such as lightning peak current, maximum current derivative, current rise time and current duration are determined. The effects of mesh size and some system parameters such as grounding resistance and lightning surge impedance are investigated.Öğe Monitoring of Leakage Flux for Rotor Fault Detection under non-adjacent broken rotor bars in Induction Motors(Ieee, 2019) Goktas, Taner; Ekinci, Imran; Yuklu, Nihat; Arkan, Muslum; Mamis, M. SalihIn this paper, leakage flux is monitored when induction motors expose to non-adjacent broken rotor bars fault. The detection of rotor faults based on stator current analysis may sometimes become challenging if the corresponding broken bar positions are in half and full pole-pitch. In such cases, electromagnetic distribution can be keep symmetrical due to induced magnetic field by corresponding broken bar positions. This leads to reduce diagnostics ability for rotor bar fault. In order to minimize the such problems, leakage flux is examined using finite element analysis (FEA) in induction motors. Comparative results for stator current and leakage flux are presented to show the diagnostics ability and advantages of leakage flux based analysis. The 2D-FEA results show that some characteristics signatures such as 3sf(s) and f(r)+sf(s) in leakage flux are more reliable signatures to detect broken rotor bar fault even the positions of broken bars are in half-and full pole pitch distance.Öğe A New Approach to Detect Stator Fault in Permanent Magnet Synchronous Motors(Ieee, 2015) Cira, Ferhat; Arkan, Muslum; Gumus, BilalIn this paper, detection of the stator winding inter-turn short circuit fault (SWISCF) in surface-mounted permanent magnet synchronous motors (SPMSMs) and classification of the fault severity via pattern recognition system (PRS) are presented. In order to automatically detect stator winding short circuit fault and to estimate severity of this fault, artificial neural network (ANN) based PRS has been used. It has been observed that the amplitude of the 3rd harmonics of the current is the most distinctive characteristic for detecting the short circuit fault ratio of the SPMSM. To increase the fault clasification accuracy of PRS both fundamental (1st) and 3rd harmonics are used. In order to validate proposed method experimental results are presented.Öğe The Performance Evaluation of Machine Learning based Techniques via Stator Current and Stray Flux for Broken Bar Fault in Induction Motors(Ieee, 2021) Younas, M. B.; Ullah, N.; Goktas, Taner; Arkan, Muslum; Gurusamy, V.In this paper, the machine learning based techniques are evaluated using stator current and stray flux for broken bar fault in induction motors (IMs). The feature extraction is achieved from Discrete Wavelet Transform (DWT) for both healthy and faulty operations. In order to analyze the performance of different classifier, six fundamental classifications with 23 sub-classifiers are used via a toolbox. It has been observed that 18 out of 23 classifiers have shown great performance (100% accuracy) and two more classifier results at accuracy of greater than 90% for stray flux. Both simulation and experimental results show that stray flux provides better diagnostics results than stator current using different machine learning based classification algorithms in IMs.Öğe Separation Harmonics for Detecting Broken Bar Fault in case of Load Torque Oscillation(Ieee, 2015) Goktas, Taner; Arkan, Muslum; Zafarani, Mohsen; Akin, BilalThis paper presents separation harmonics to discriminate rotor failure from low frequency load torque oscillations in three phase induction motors. The most common method for detecting broken rotor bar faults is to analyze the corresponding sidebands through motor current signature analysis (MCSA). If a motor is subjected to load fluctuation, then the oscillation related sidebands exhibit similar behaviors as well. Particularly, when the load fluctuation frequency is close or equal to that of broken bars, the stator current spectrum analysis can be misleading. In this study, torque and motor phase voltage waveforms are exhaustively analyzed to discriminate broken rotor bar fault from low frequency load torque oscillation in three phase induction motors. In order to extract and justify the separation patterns, 2-D Time Stepping Finite Element Method (TSFEM) is used. The simulation and experimental results show that the proposed approach can successfully be applied to fault separation process in star connected motors.Öğe Separation of Induction Motor Rotor Faults and Low Frequency Load Oscillations Through the Radial Leakage Flux(Ieee, 2017) Goktas, Taner; Arkan, Muslum; Mamis, M. Salih; Akin, BilalThis paper presents a separation method to discern broken rotor bar fault from low frequency load torque oscillation thorough radial leakage flux spectrums in induction motors (IMs). Broken rotor bar fault can usually be detected using classical motor current based analysis (MCSA), but it may not provide reliable results since its performance depend on motor topology, stator winding and load type. Particularly, if a motor is subjected to load fluctuation, then oscillation related signatures exhibit similar behavior that of broken bar which leads misleading signatures. In this paper, radial leakage flux spectrum is exhaustively analyzed thorough a fluxgate sensor to discern these two effects in IMs. It is shown that there are some additional characteristics broken bar signatures such as 3sf(s) and (f(s)-f(r))+/- 2sf(s) in radial leakage flux which do not appear in low frequency load torque oscillation case. A 2-Dimensional (2D) finite element analysis and experiments are carried to show that using leakage flux can provide a separation method and more reliable results than classical MCSA in IMs.
