Detection of partial discharge acoustic emission in power transformer

Shaker, Yomna

doi:10.11591/ijece.v9i6.pp4573-4579

Cited by 10 publications

(9 citation statements)

References 8 publications

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“…Mostly used for transmission of electrical power, power cables are also used under variety of electrical, mechanical and environmental conditions [1]. Partial discharge (PD) analysis is important to assess and evaluate the insulation state of high voltage equipment under service in order to determine the severity of degradation [2][3][4][5]. PD is a phenomenon where a breakdown process of a small area of an insulation, which is subjected to high voltage occurs.…”

Section: Introductionmentioning

confidence: 99%

Partial discharge detection device using ultrasonic sensor on medium voltage XLPE cable

Radzi

Nik

Rameli

et al. 2020

IJEECS

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There are many methods that have been studied by earlier researchers in order to detect the acoustic properties of Partial Discharge (PD) emitted by PD sources. One of the methods known as ultrasonic sensing on medium voltage Cross-Linked Polyethylene (XLPE) cable was adopted to detect partial discharges on commercial applications, usually by using Acoustic Emission (AE) sensors. This paper presents the processes of designing a PD sensor to detect the acoustic properties of the partial discharges on medium voltage XLPE cable. This PD sensor method works by detecting the partial discharges occurred at the joint of the cable which can act as an early warning device to help minimize the repair and maintenance costs of degrading cable. Result of the experiment shows the complete design of the prototype device, the device after fabrication and the functionality of the device. This design of the prototype can be beneficial for future uses in designing cost efficient and smaller sized PD detection devices. By positioning the sensor in horizontal position directly to the source of PD on the cable, the sensor will be able to detect acoustic properties of PD, by picking up the frequencies beyond 40 kHz. By varying the voltage applied values, a design of experiment (DOE) is carried out accordingly. Result of the experiment shows that the prototype device is functioning as expected, and hence this finding will be very useful to the consumers of power industries as the sensor device can serve as an alternative device to the commercialized PD sensing devices which are bulky and expensive.

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Section: Introductionmentioning

confidence: 99%

Partial discharge detection device using ultrasonic sensor on medium voltage XLPE cable

Radzi

Nik

Rameli

et al. 2020

IJEECS

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“…For the early detection of these failures, some non-destructive methods have shown promising results [3][4][5][6][7]. The acoustic emission method consists in the frequency analysis of the acoustic signal behavior, provided by the machine and when combined with temporal data, it is possible to establish patterns of evolution in the degradation of the transformer [2,[8][9][10]. In the final stages of the total failure in the transformer, it is common to detect discharges (DPs), which are low energy ionization processes in dielectrics materials, composing the machine insulation [11,12].…”

Section: Introductionmentioning

confidence: 99%

An Application of Wavelet Analysis to Assess Partial Discharge Evolution by Acoustic Emission Sensor

Santos

Castro

Binotto

et al. 2020

7th International Electronic Conference on Sensors and Applications

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Under normal operation, insulation systems of high voltage electrical devices, like power transformers, are constantly subjected to multiple types of stresses (electrical, thermal, mechanical, environmental, etc.), which can lead to a degradation of the machine insulation. One of the main indicators of the dielectric degradation process is the presence of partial discharges (PD). Although it starts due to operational stresses, PD can cause a progressive insulation deterioration, since it is characterized by localized current pulses that emit heat, UV radiation, acoustic, and electromagnetic waves. In this sense, acoustic emission (AE) transducers are wildly applied in PD detection. The goal is to reduce maintenance costs by predictive actions and avoid total failures. Becasue of the progressive deterioration, the assessment of the PD evolution is crucial for improving the maintenance planning and ensure the operation of the transformer. Based on this issue, this article presents a new wavelet -based analysis in order to characterize the PD evolution. Three levels of failures were carried out in a transformer and the acoustic signals captured by a lead zirconate titanate piezoelectric transducer were processed by discrete wavelet transform. The experimental results revealed that the energy of the approximation levels increasing with the failure evolution. More specifically, levels 4, 6, 7, and 10 presented a linear fit to characterize the phenomena, enhancing the applicability of the proposed approach to transformer monitoring.

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“…The analysis of acoustic emission (AE) signals is widely used to detect damage in solid materials. The most popular areas of application are the supervision of fatigue phenomena and cracks in steel structures [ 1 , 2 , 3 , 4 ], rolling elements in bearings [ 5 , 6 ] or the occurrence of partial discharges in power transformers [ 7 , 8 ] and medium voltage switchgears [ 9 , 10 , 11 ]. There have been attempts at recognizing AE signals in low voltage insulated gate bipolar transistors (IGBTs) [ 12 , 13 , 14 , 15 , 16 ] even with changes of junction and case temperature [ 17 ].…”

Section: Introduction To the Subject Mattermentioning

confidence: 99%

Identification of Gate Turn-Off Thyristor Switching Patterns Using Acoustic Emission Sensors

Kozak

Bejger

Tomczak

2020

Sensors

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Modern seagoing ships are often equipped with converters which utilize semiconductor power electronics devices like thyristors or power transistors. Most of them are used in driving applications such as powerful main propulsion plants, auxiliary podded drives and thrusters. When it comes to main propulsion drives the power gets seriously high, thus the need for use of medium voltage power electronics devices arises. As it turns out, power electronic parts are the most susceptible to faults or failures in the whole electric drive system. These devices require efficient cooling, so manufacturers design housings in a way that best dissipates heat from the inside of the chips to the metal housing. This results in susceptibility to damage due to the heterogeneity of combined materials and the difference in temperature expansion of elements inside the power device. Currently used methods of prediction of damage and wear of semiconductor elements are limited to measurements of electrical quantities generated by devices during operation and not quite effective in case of early-stage damage to semiconductor layers. The article presents an introduction and preliminary tests of a method utilizing an acoustic emission sensor which can be used in detecting early stage damages of the gate turn-off thyristor. Theoretical considerations and chosen experimental results of initial measurements of acoustic emission signals of the medium voltage gate turn-off thyristor are presented.

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Detection of partial discharge acoustic emission in power transformer

Cited by 10 publications

References 8 publications

Partial discharge detection device using ultrasonic sensor on medium voltage XLPE cable

Partial discharge detection device using ultrasonic sensor on medium voltage XLPE cable

An Application of Wavelet Analysis to Assess Partial Discharge Evolution by Acoustic Emission Sensor

Identification of Gate Turn-Off Thyristor Switching Patterns Using Acoustic Emission Sensors

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