Transformers are essential and important elements of power systems. In the past few years, there has been an increasing concern about the occurrence of turn-to-turn faults in power transformers due to the high costs that unexpected outages cause. It is not always possible to analyze the transformer behavior under such faults under rated conditions, since the tests are largely destructive. There...

The diagnosis of blade crack faults is critical to ensuring the safety turbomachinery. Blade tip timing (BTT) a non-contact vibration displacement measurement technique, which has been extensively studied for condition monitoring recently. fault methods based on deep learning can be summarized as studying internal logical relationship data, automatically mining features, and intelligently ident...

F. González-Lodeiro (Y) 7 F. Aldaya 7 J. Galindo-Zaldívar A. Jabaloy Departamento de Geodinámica, Universidad de Granada, E-18071 Granada, Spain E-mail: jgalindo6goliat.ugr.es Abstract In the internal zones of the Betic cordilleras, extensional structures have developed from the Upper Oligocene to the present day; they are contemporaneous with compressional structures (folds and thrusts) in the...

Will mankind ever be able to construct the elusive 'perpetuum mobile'? We are still far from being able to design systems with a guaranteed finite lifetime, let alone those that we can confidently expect to function unaided in the presence of faults. For example, the Beagle II Mars mission just failed due to malfunction and, worse, the Columbia Space Shuttle suffered the same fate with the loss...

Shunt capacitor banks are used to improve the quality of the electrical supply and the efficient operation of the power system. Studies show that a flat voltage profile on the system can significantly reduce line losses. Shunt capacitor banks are relatively inexpensive and can be easily installed anywhere on the network. This paper reviews principles of shunt capacitor bank design for substatio...

Despite perfect functioning of its internal components, a robot can be unsuccessful in performing its tasks because of unforeseen situations. Mostly these situations arise from the interaction of a robot with its ever-changing environment. In this paper we refer to these unsuccessful operations as external unknown faults. We reason along the most frequent failures in typical scenarios which we ...

In this paper we present a combinatorial scheme based on hidden Markov models (HMM) and wavelet transform (WT) to discriminate between magnetizing inrush currents and internal faults in power transformers. HMMs are powerful tools for transient classification which compute the maximum likelihood probability between training and testing data signals for identification. The WT is employed to extra...

Abstract This research presents a high frequency-based algorithm for zonal protection of meshed Multi-Terminal voltage Direct Current (MTDC) systems. Discrete wavelet transform (DWT) is used to capture frequency current transients from one end each line. The faulty line identified by analyzing two distinct bands form the captured transients. characteristics these during normal condition are dif...

Piston scuffing is one of the destructive faults in internal combustion (IC) engines. There are different causes to make this fault that lack of lubricant is the most important one among them. The purpose of this paper is the quantitative study of the piston scuffing effects on the engine performance parameters which is a new research direction in the IC engine filed. For this reason, several e...

Abstract Monitoring transformer vibration signals is a universal application method to realize the diagnosis of internal mechanical faults transformers. However, actual operating interfered by noise surrounding electrical equipment, which reduces accuracy signal identification. This paper simulate typical sources in environment, including fan and equipment fault noise, explore impact different ...