scholarly journals Linear Method for Diagnosis of Inter-Turn Short Circuits in 3-Phase Induction Motors

2019 ◽  
Vol 9 (22) ◽  
pp. 4822 ◽  
Author(s):  
Yeong-Jin Goh ◽  
On Kim
Keyword(s):  
Steady State ◽  
Induction Motor ◽  
Early Stage ◽  
Short Circuit ◽  
Linear Method ◽  
Linear Separation ◽  
Synchronous Reference Frame ◽  
Steady State Current ◽  
Diagnosis Method ◽  
Current Change

When a turn-to-turn short fault occurs in an induction motor, it will be accompanied by vibration and heating, which will have adverse effects on the entire power system. Thus, turn-to-turn short fault diagnosis of the stator is required, and major accidents can be prevented if an inter-turn short circuit (ITSC), which is the early stage of a turn-to-turn short, can be detected. This study reinterprets Park’s vector approach using Direct-Quadrature(D-Q) transformation for the linear separation of ITSCs and proposes an ITSC diagnosis method by defining the magnetic flux linkage pulsation and current change in the event of a turn-to-turn short. It is difficult to diagnose because the turn-to-turn short current change in an ITSC is considerably different from the induction motor loss. Hence, it was found through analysis that when the current change is considered through an analysis of the relationship between inductance and the winding number, the ITSC current becomes slightly smaller than the steady-state current. This was verified using the D-Q synchronous reference frame over time. We proposed a linear separation of the ITSC diagnosis from the steady state by considering the minimum values of the pulsating current as feature points.

scholarly journals Identification of Inter-Turn Short-Circuits in Induction Motor Stator Winding Using Simulated Annealing

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 117
Author(s):  
Marcin Tomczyk ◽  
Ryszard Mielnik ◽  
Anna Plichta ◽  
Iwona Goldasz ◽  
Maciej Sułowicz
Keyword(s):  
Simulated Annealing ◽  
Induction Motor ◽  
Induction Motors ◽  
Early Stage ◽  
Dynamic Properties ◽  
Short Circuit ◽  
State Variables ◽  
Novel Approach ◽  
Short Circuits ◽  
Identification Processes

This paper presents a method of inter-turn short-circuit identification in induction motors during load current variations based on a hybrid analytic approach that combines the genetic algorithm and simulated annealing. With this approach, the essence of the method relies on determining the reference matrices and calculating the distance between the reference matric values and the test matrix. As a whole, it is a novel approach to the process of identifying faults in induction motors. Moreover, applying a discrete optimization algorithm to search for alternative solutions makes it possible to obtain the true minimal values of the matrices in the identification process. The effectiveness of the applied method in the monitoring and identification processes of the inter-turn short-circuit in the early stage of its creation was confirmed in tests carried out for several significant state variables describing physical magnitudes of the selected induction motor model. The need for identification of a particular fault is related to a gradual increase in its magnitude in the process of the induction motor’s exploitation. The occurrence of short-circuits complicates the dynamic properties of the measured diagnostic signals of the system to a great extent.

scholarly journals Steady State Current Limiting Characteristics of Fault Current Limiter at Three-Phase Short Circuit Fault in Electric Power System

2003 ◽  
Vol 123 (4) ◽  
pp. 457-465 ◽  
Author(s):  
Hirotaka Shimizu ◽  
Yasunobu Yokomizu ◽  
Masuo Goto ◽  
Toshiro Matsumura
Keyword(s):  
Steady State ◽  
Short Circuit ◽  
Electric Power System ◽  
Fault Current ◽  
Fault Current Limiter ◽  
Three Phase ◽  
Steady State Current ◽  
Current Limiting ◽  
Current Limiter ◽  
Short Circuit Fault

scholarly journals Determination of the Sufficient Inductance of AC Line Reactor at the Input of Frequency Converter

2019 ◽  
Vol 11 (1) ◽  
pp. 25-29 ◽  
Author(s):  
M Yu Pustovetov
Keyword(s):  
Steady State ◽  
Induction Motor ◽  
Induction Motors ◽  
Short Circuit ◽  
Frequency Converter ◽  
Steady State Mode ◽  
Peak Current ◽  
Stable Characteristic ◽  
Additional Charge

 This article discusses the problem of sufficient inductance of AC line reactor at the input of frequency converter. Author provided some simulations for frequency converter loaded by induction motors with different rated powers. For all induction motors the following characteristics of phase current consumed by frequency converter from the grid considered. Instantaneous peak current during the frequency acceleration of induction motor. Amplitude of the current in steady state mode after the end of induction motor acceleration. Instantaneous peak current during additional charge of DC-link capacitance through the shunting contact of charging resistance. Instantaneous peak current when charging DC-link capacitance through the charging resistance - the most stable characteristic, which is practically does not depend on the presence and nominal of the line reactor. It is advisable to demand to inductance of the line reactor, that is, to percent impedance or short-circuit voltage, %, that the considered in computational experiments peak and amplitude values of currents remain not higher than the last above mentioned. It can be stated that with the increase of induction motor rated power, the sufficient value of short-circuit voltage, %, also increases. 

scholarly journals Integration of Voltage Source Converters in Steady-State RMS Short-Circuit Analysis

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3610
Author(s):  
Carlos Coelho Teixeira ◽  
Helder Leite
Keyword(s):  
Steady State ◽  
Reactive Power ◽  
Early Stage ◽  
Short Circuit ◽  
Current Source ◽  
Circuit Analysis ◽  
Voltage Source ◽  
Voltage Source Converters ◽  
Analysis Techniques ◽  
Short Circuit Analysis

Voltage source converters (VSCs) are self-commutated converters able to generate AC voltages with or without the support of an AC connecting grid. VSCs allow fast control of active and reactive powers in an independent way. VSCs also have black start capability. Their use in high-voltage direct current (HVDC) systems, comparative to the more mature current source converter (CSC)-based HVDC, offers faster active power flow control. In addition, VSCs provide flexible reactive power control, independent at each converter terminal. It is also useful when connecting DC sources to weak AC grids. Steady-state RMS analysis techniques are commonly used for early-stage analysis, for design purposes and for relaying. Sources interfaced through DC/AC or AC/DC/AC converters, opposite to conventional generators, are not well represented by electromotive forces (E) behind impedance models. A methodology to include voltage source converters (VSCs) in conventional RMS short-circuit analysis techniques is advanced in this work. It represents an iterative procedure inside general calculation techniques and can even be used by those with only basic power electronics knowledge. Results are compared to those of the commercial software package PSS®CAPE to demonstrate the validity of the proposed rmsVSC algorithm.

Incipient Inter-Turn Short Circuit Fault Estimation Based on a Faulty Model Observer and ANN-Method for Induction Motor Drives

2019 ◽  
Vol 12 (4) ◽  
pp. 374-383
Author(s):  
Mohamed Bouakoura ◽  
Mohamed-Said Naït-Saïd ◽  
Nasreddine Nait-Said
Keyword(s):  
Induction Motor ◽  
Early Stage ◽  
Short Circuit ◽  
Motor Drives ◽  
Equivalent Model ◽  
Fault Estimation ◽  
Fault Severity ◽  
Bus Voltage ◽  
Artificial Neural Network Ann ◽  
Short Circuit Fault

Background: According to statistics, short circuit faults are the second most frequent faults in induction motors. Thus, in this paper, we investigated inter turn short circuit faults in their early stage. Methods: A new equivalent model of the induction motor with turn to turn fault on one phase has been developed. This model has been used to establish two schemes to estimate the severity of the short circuit fault. In the first scheme, the faulty model is considered as an observer, where a correction of an error between the measured and the estimated currents is the kernel of the fault severity estimator. However, to develop the second method, the model was required only in the training process of an artificial neural network (ANN). Since stator faults have a signature on symmetrical components of phase currents, the magnitudes and angles of these components were used with the mean speed value as inputs of the ANN. A simulation on MATLAB of both techniques has been performed with various stator frequencies. Results: The suggested schemes prove a unique efficiency in the estimation of incipient turn to turn fault. Besides, the ANN based scheme is less complex which reduces its implementation cost. Conclusion: To monitor the stator of an induction motor, the choice of the appropriate algorithm should be done according to the system in which the motor will be installed. If the motor is directing connected to the grid or fed via an inverter with a variable DC bus voltage, the observer would be better, otherwise, the ANN algorithm is recommended.

scholarly journals Detection of Inter-Turn Faults in Multi-Phase Ferrite-PM Assisted Synchronous Reluctance Machines

Energies ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2733 ◽  
Author(s):  
Carlos Candelo-Zuluaga ◽  
Jordi-Roger Riba ◽  
Carlos López-Torres ◽  
Antoni Garcia
Keyword(s):  
Early Stage ◽  
Short Circuit ◽  
Operating Conditions ◽  
Spectral Content ◽  
Stator Current ◽  
Zero Sequence ◽  
Motor Current Signature Analysis ◽  
Diagnosis Method ◽  
Multi Phase ◽  
Zero Sequence Voltage

Inter-turn winding faults in five-phase ferrite-permanent magnet-assisted synchronous reluctance motors (fPMa-SynRMs) can lead to catastrophic consequences if not detected in a timely manner, since they can quickly progress into more severe short-circuit faults, such as coil-to-coil, phase-to-ground or phase-to-phase faults. This paper analyzes the feasibility of detecting such harmful faults in their early stage, with only one short-circuited turn, since there is a lack of works related to this topic in multi-phase fPMa-SynRMs. Two methods are tested for this purpose, the analysis of the spectral content of the zero-sequence voltage component (ZSVC) and the analysis of the stator current spectra, also known as motor current signature analysis (MCSA), which is a well-known fault diagnosis method. This paper compares the performance and sensitivity of both methods under different operating conditions. It is proven that inter-turn faults can be detected in the early stage, with the ZSVC providing more sensitivity than the MCSA method. It is also proven that the working conditions have little effect on the sensitivity of both methods. To conclude, this paper proposes two inter-turn fault indicators and the threshold values to detect such faults in the early stage, which are calculated from the spectral information of the ZSVC and the line currents.

scholarly journals Envelope Analysis on Vibration Signals for Stator Winding Fault Early Detection in 3-Phase Induction Motors

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Chao Jin ◽  
Agusmian P. Ompusunggu ◽  
Zongchang Liu ◽  
Hossein D. Ardakani ◽  
Fredrik Petré ◽  
...  
Keyword(s):  
Induction Motor ◽  
Early Stage ◽  
Short Circuit ◽  
Frequency Component ◽  
Stator Winding ◽  
Envelope Analysis ◽  
Fault Severity ◽  
Three Phase ◽  
Motor Condition ◽  
Novel Method

This paper brings up a novel method for detecting induction motor stator winding faults at an early stage. The contribution of the work comes from the delicate handling of motorvibration by applying envelope analysis, which makes it possible to capture electrical short-circuit signature in mechanical signals, even if the magnitude of the fault is fairly incipient. Conventional induction motor condition-based maintenance methods usually involve current and voltage measurements, which could be expensive to collect, and vibration-based analysis is often only capable of detecting the fault when it is already quite significant. In contrast, the solution presented in this study provides a refreshing perspective by applying time synchronous averaging to remove the discrete frequency component, and amplitude demodulation to further enhance the signal with the help of kurtogram. Experimental results on a three-phase induction motor show that the method is also able to distinguish different fault severity levels.

Open and Short Circuit Diagnosis of a VSI Fed Three Phase Induction Motor Drive Using Fuzzy Logic Technique

2013 ◽  
Vol 6 (6) ◽  
pp. 1858
Author(s):  
K. Mohanraj ◽  
S. Paramasivam ◽  
Subhransu Sekhar Dash ◽  
Ahmed Faheem Zobaa
Keyword(s):  
Fuzzy Logic ◽  
Induction Motor ◽  
Short Circuit ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Three Phase ◽  
Fuzzy Logic Technique

Advance Protection for Three Phase Induction Motor using Microcontroller Atmega32

2018 ◽  
Vol 8 (1) ◽  
pp. 172
Author(s):  
Karan S Belsare ◽  
Gajanan D Patil
Keyword(s):  
Induction Motor ◽  
Low Cost ◽  
Short Circuit ◽  
Cost Factor ◽  
Protection Scheme ◽  
Three Phase ◽  
The Cost

A low cost and reliable protection scheme has been designed for a three phase induction motor against unbalance voltages, under voltage, over voltage, short circuit and overheating protection. Taking the cost factor into consideration the design has been proposed using microcontroller Atmega32, MOSFETs, relays, small CTs and PTs. However the sensitivity of the protection scheme has been not compromised. The design has been tested online in the laboratory for small motors and the same can be implemented for larger motors by replacing the i-v converters and relays of suitable ratings.

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