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This paper presents permanent magnet synchronous machines with short circuit of turns. Two-dimensional (2-D) finite element analysis (FEA) is used to simulation of PMSM under fault. PMSM is working at nominal condition and speed change of 5000 rpm. Relationships between stator-current-induced harmonics were investigated by means of Fourier (FFT) and discrete wavelet transforms (DWT). The simulation...
At present automatic control systems and control of distributed power facilities are complex technical systems, in which include large number of elements and have complex structure. Automated system of management of technical process (ASMTP) is a group of solutions of hardware and software designed to automate control of technological equipment in industrial enterprises.
Transform is a vital equipment in power system that need protection system in order to provide fast and correct response when disturbance occur in system. So, this paper proposed internal and external fault classification in Transformer using algorithm based on discrete wavelet transform (DWT). Low frequency component from DWT has been used to create condition for algorithm. The proposed algorithm...
The application of machine learning to software fault injection data has been shown to be an effective approach for the generation of efficient error detection mechanisms (EDMs). However, such approaches to the design of EDMs have invariably adopted a fault model with a single-fault assumption, limiting the practical relevance of the detectors and their evaluation. Software containing more than a...
This paper develops an analytical model to study the performance of dual-wound three-phase surface permanent magnet synchronous machines under normal operating conditions and various fault scenarios. A generic analytical model of inductance calculation is developed considering multiple layers of coils in the stator slots for different slot-pole combinations. The performance of three dual-wound machine...
Outlier-tolerance is the important part to the safety studies of technology process, and it is also one of the key technologies that can guarantee the operation safety of the dynamic system. Firstly, how to realize the safe and reliable processing of fault and outliers is discussed. This paper analyzes the significant differences that exist in the three kinds fault tolerance research branches which...
Voltage dips are significant threat for distributed generation (DG) connected via grid-tie inverter to the power system. Fast detection of voltage dips is essential for proper operation of the DGs. The paper presents an overview of different methods for their detection. The dips can be traced by appearance of voltage harmonics. Therefore, categorization of harmonics estimation techniques is given...
The necessary conditions for detecting and localizing the faults in control systems with a complicated structure are suggested. It is shown that the topological conditions do not depend on the class of operators of the dynamic model of the control system and are verified using path search algorithms in directed graphs. The fault localization algorithm is reduced to the construction and analysis of...
The necessary conditions for the diagnosability of control systems with a complex structure are given. It is shown that the topological conditions for detectability and localization of the fault signal do not depend on the class of operators of the dynamic model of the control system and are checked by using path search algorithms in directed graphs.
A fast overcurrent protection scheme was developed for GaN gate injection transistors (GITs), harnessing the relationship between the externally measured vgs and id in steady-state operation. This relationship has been characterized in both static and dynamic testing over a wide range of operating conditions, and a circuit has been constructed to implement this control scheme. The circuit uses analog...
In this paper, the stray magnetic field of induction motor under static eccentricity, dynamic eccentricity and mixed eccentricity faults is studied, and its frequency signatures are derived, where the theoretical analysis is based on the harmonic magnetomotive force and air gap permeance of induction motor with squirrel cage rotor. Motor stray magnetic field signature analysis has the advantages of...
Voltage Source Converters (VSC) are becoming more common in modern High Voltage DC (HVDC) transmission systems. One of the major challenges in a multi-terminal VSC-HVDC is protection against DC side faults. Two major designs, namely, the hybrid DC breaker and the assembly HVDC breaker, are compared for operational behavior, speed of operation and current carrying capability. The Dual Modular Redundancy...
The problem of dependability assessment can be solved analytically just under predefined conditions. If they do not hold, alternative approaches must apply. Widely, they rely on the Monte Carlo simulation, suffering by the high computational complexity. Some rest on further instruments such as probabilistic timed automata that have been shown to be efficient to solve problems in various areas. However,...
The techniques used in fault diagnosis of automotive engine oils are discussed. The importance of Oil change at the right time and the effect of parameters like water contamination, particle contamination, oxidation, viscosity, fuel content in oil are also discussed. Analysis is carried out on MATLAB with reference to the variation of Dielectric constant of lubrication oil over the use period. The...
Today's complex processes and plants are vulnerable to different faults, misconfiguration, non-holistic and improper control and management which cause abnormal behavior and might eventually result in poor and sub-optimal operation, dissatisfaction, damage to the plant, to personnel and resources, or even to the environment. To cope with these, adverse condition and critical event prediction plays...
Software, in many different fields and tasks, hasplayed a critical role and even replaced humans to improveefficiency and safety. However, catastrophic consequences can becaused by implementation bugs and design defects. Modifiedcondition/decision coverage (MC/DC), required by the FederalAviation Administration on Level A (the most safety criticalsystem), has been shown to be effective in detecting...
This paper describes evaluation and consequent improvements in the field of dependability prediction from the beginning to nowadays. The necessity to determine the reliability characteristics of the electronic equipment is shown. The basic terms, definitions and current problems are described. The demonstration of the prediction of reliability parameters according to the MIL-HDBK-217 standard based...
High proliferation of Inverter Interfaced Distributed Energy Resources (IIDERs) into the electric distribution grid results in failure of the traditional overcurrent based fault detection at the point of interconnection (POI) of IIDERs. This paper focuses on other strategies of detection, namely, 1) using the transient content at the inverter output, 2) using zero sequence current magnitude at the...
The internal overvoltage is one of the key technical problems for half-wavelength AC transmission (HWACT). It is a short time for arresters to have low resistance, and the influence of arresters in the HWACT line can be neglected. Therefore, arresters can be used as an option of the suppression of transient overvoltage in HWACT lines. In this paper, an optimal arrangement scheme of arresters along...
In this paper an analytical model is presented to demonstrate the performance of a dual wound three phase surface permanent magnet synchronous machine. In addition to normal operating conditions, the model is extended to explain various fault scenarios of the machine. Self and mutual inductances of a dual wound machine with double layer winding are analytically calculated from winding function and...
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