The wind turbine converts the wind energy into electrical energy, wherein the electrical machines are coupled with wind turbines for this conversion. The electrical machines are liable to meet with faults, but to regain the system reliability the faults should be detected earlier. According to studies of electrical power research institute (EPRI) most of the faults in electrical motors are crea...

Five-phase permanent magnet synchronous motors (PMSMs) have inherent fault-tolerant capabilities. This paper analyzes the detection of inter-turn short circuit faults in five-phase PMSMs in their early stage, i.e. with only one turn in short circuit by means of the analysis of the stator currents and the zero-sequence voltage component (ZSVC) spectra. For this purpose, a parametric model of fiv...

When a fault occurs during an industrial inspection, workmen have to manually find the location and type of the fault in order to remove it. It is often difficult to accurately find the location and type of fault. Hence, development of an offline intelligent fault diagnosis system for process control industry is of great importance since successful detection of fault is a precursor to fault iso...

The photoelectrical properties of two dyes-ethyl red and carminic acid-as sensitizers of dye-sensitized solar cells were investigated in experiments herein described. In order to reveal the reason for the difference between the photoelectrical properties of the two dyes, the ground state and excited state properties of the dyes before and after adsorbed on TiO₂ were calculated via density funct...

The electrical substation components are often subject to degradation due to over-voltage or over-current, caused by a short circuit or a lightning. A particular interest is given to the circuit breaker, regarding the importance of its function and its dangerous failure. This component degrades gradually due to the use, and it is also subject to the shock process resulted from the stress of iso...

Various faults will occur in the power grid during operation, among which system short-circuit fault is most common. The introduction of photovoltaic has changed structure grid. no longer original single-source radial structure, but becomes a dual-end or multi-end grid, thus changing size, direction, and duration current. It helpful to study current output characteristics systems short circuit ...

In the case of digital circuits, the possible defects in a circuit may be modelled by faults such as the singlestuck fault model and bridging faults. Thus a very large numbe of possible defects may be reduced to a relatively small number of faults. In digital fault simulation, a number of copies of the circuit are made, each of which contains exactly one fault, together with the fault-free circ...

Fault detection in analog to digital converters is a difficult task that can been enhanced with the application of Built-in Sensors. The special capability of dynamic current sensors, that include the capability to process the highest frequency components in the dynamic power supply current, to detect fault in SI algorithmic analog to digital converter, with a relative reduce area increments in...

Although nowadays ac drives are more frequently used, dc drives continue being used, mainly in industrial plants, as in Açominas. Normally, duals converters compose these drives, were faults related with them are important in relation with available time of equipments. Besides, speed sensors, as taco generator and pulse generator, are important factor to become these systems weaker. Then, in th...

   A modified morphology was introduced for poly(3-hexylthiophene):phenyl-C71-butyric acid methyl ester (P3HT:PC71BM) bulk heterojunction (BHJ) solar cells by thermal and solvent annealing treatments in the presence of hydrophilic-hydrophobic block copolymers. Power conversion efficiency (PCE) plummet was prohibited during both thermal and solvent treatments for all BHJ devices modified wit...