A low cost system for acoustic monitoring of partial discharge in power transformer by Piezoelectric Sensor

Castro, Bruno Albuquerque de; Clerice, Guilherme Augusto Marabezzi; Andreoli, André Luiz; Campos, F. de; Ulson, José Alfredo Covolan

doi:10.1109/tla.2016.7587624

Cited by 15 publications

(7 citation statements)

References 5 publications

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“…The polarization produced by the voltage creates charges and therefore an electric field. In the reverse effect, the application of an electric voltage in the piezoelectric material causes a mechanical deformation [47].…”

Section: Piezoelectric Diaphragmsmentioning

confidence: 99%

A Time–Frequency Acoustic Emission-Based Technique to Assess Workpiece Surface Quality in Ceramic Grinding with PZT Transducer

Viera

Aguiar

Oliveira

et al. 2019

Sensors

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Innovative monitoring systems based on sensor signals have emerged in recent years in view of their potential for diagnosing machining process conditions. In this context, preliminary applications of fast-response and low-cost piezoelectric diaphragms (PZT) have recently emerged in the grinding monitoring field. However, there is a lack of application regarding the grinding of ceramic materials. Thus, this work presents an analysis of the feasibility of using the acoustic emission signals obtained through the PZT diaphragm, together with digital signal processing in the time–frequency domain, in the monitoring of the surface quality of ceramic components during the surface grinding process. For comparative purpose, an acoustic emission (AE) sensor, commonly used in industry, was used as a baseline. The results obtained by the PZT diaphragm were similar to the results obtained using the AE sensor. The time–frequency analysis allowed to identify irregularities throughout the monitored process.

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Section: Piezoelectric Diaphragmsmentioning

confidence: 99%

A Time–Frequency Acoustic Emission-Based Technique to Assess Workpiece Surface Quality in Ceramic Grinding with PZT Transducer

Viera

Aguiar

Oliveira

et al. 2019

Sensors

View full text Add to dashboard Cite

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“…The PLB test is a well-known test in signal processing to determine the sensor frequency response, as seen in [11,12]. For the experimental setup used in this work, the cut-off frequency for the piezoelectric sensor was about 117 kHz, which is compatible with its application in vibration analysis (up to 20 kHz).…”

Section: Piezoelectric Sensors: Reviewmentioning

confidence: 93%

Study of a Low-Cost Piezoelectric Sensor for Three Phase Induction Motor Load Estimation

Lucas

Castro

Rocha

et al. 2018

5th International Electronic Conference on Sensors and Applications

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Due the complexity of control and automation networks in modern industries, sensor-based systems stand out as effective approaches for failure detection in electrical and mechanical machines. This kind of intervention has a high operational value in industrial scenarios, once it can avoid corrective maintenance stops, i.e., before the failure reaches a high level of severity and compromises the machine. Consequently, the development of sensors applied to non-destructive techniques (NDT) for failure monitoring in electrical machines has become a recurrent theme in recent studies. In this context, this paper investigates the application of low-cost piezoelectric sensors for vibration analysis, which is an NDT that has already proved to be efficient for the detection of many structural anomalies in induction motors. Further, the proposed work presents a low-cost alternative approach for expensive commercial sensors, which will make this NDT more attractive for industrial applications. To describe the piezoelectric sensor frequency response, a pencil lead break (PLB) test was performed. After this validation, the Root Mean Square (RMS) value from the voltage samples obtained in the test bench was used as a signal processing method. A comparison between the results for different levels of mechanical load attached to the machine shaft indicated not only the successful performance of the low-cost sensors for load estimation purposes, but also showed that oversized motors may present higher vibration levels in some components that could cause mechanical wearing.

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“…The reverse effect also occurs, i.e., by applying an electric voltage in the piezoelectric material, a mechanical deformation arises. The equations, and more details can be accessed in [13,14]. The piezoelectric transducers, shown in Figure 1, have a ceramic disk of 25.0 mm × 0.23 mm, and a brass plate of 35.0 mm × 0.30 mm are already consolidated for partial discharge detection in power transformers [13].…”

Section: Piezoelectric Sensorsmentioning

confidence: 99%

Evaluation of Low Cost Piezoelectric Sensors for the Identification of Partial Discharges Evolution

Akiyoshi

Castro

Leão

et al. 2018

5th International Electronic Conference on Sensors and Applications

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Transformers are essential equipment in electrical energy systems and their failure may lead to the loss of a power supply. Both industry and science have sought to develop sensors and low-cost solutions for the correct diagnosis of their failures. Thus, the use of piezoelectric sensors in the diagnosis of partial discharge in power transformers has been growing significantly, in order to ensure the reduction of maintenance costs, as well as the quality of electric power supply, since this type of failure can lead to a significant cost of repair. In many cases, when partial discharge is detected, there is no immediate need to promote transformer maintenance. In this way, it becomes reasonable to study the evolution of this phenomenon, so that the maintenance of the device can be scheduled and performed correctly. In this regard, this article presents a feasibility study of a low-cost piezoelectric transducer for the identification of the evolution level of partial discharges. For this purpose, in a 30 kVA distribution transformer, three corona partial discharges were produced under three different voltage levels, using a copper electrode. The low cost piezoelectric sensor was coupled to the transformer housing. The acoustic emission signals of the three partial discharge levels were captured and analyzed by the use of acoustic signal metrics, such as energy, peak value, and power spectral density. The experimental results indicated that the low cost sensor is able to identify the evolution of the partial discharge intensity, since the values obtained by the metrics are directly related to the partial discharge levels. Therefore, the results reported in this study indicate that the piezoelectric transducer has a great applicability in diagnosing the partial discharges evolution, and, thus, can assist in the planning of electrical maintenance.

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A low cost system for acoustic monitoring of partial discharge in power transformer by Piezoelectric Sensor

Cited by 15 publications

References 5 publications

A Time–Frequency Acoustic Emission-Based Technique to Assess Workpiece Surface Quality in Ceramic Grinding with PZT Transducer

A Time–Frequency Acoustic Emission-Based Technique to Assess Workpiece Surface Quality in Ceramic Grinding with PZT Transducer

Study of a Low-Cost Piezoelectric Sensor for Three Phase Induction Motor Load Estimation

Evaluation of Low Cost Piezoelectric Sensors for the Identification of Partial Discharges Evolution

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