Detection of conductive layers short circuit in HV condenser bushings using Frequency Domain Spectroscopy

Buchacz, Jerzy; Cichoń, A.; Skubis, J.

doi:10.1109/tdei.2016.005933

Cited by 16 publications

(7 citation statements)

References 9 publications

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“…Moreover, it is essential to note that all the simulation is done at a reference temperature, which is 20 °C. The obtained results in this section are along with [13][14][15][16][17][18]. As mentioned earlier, there are other researches in which the impact of the OIP moisture content on FDS curves is investigated, or the moisture content of the OIP is estimated using a mathematical equation.…”

Section: Fem Model Of Oip Bushingmentioning

confidence: 89%

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Diagnosis of Moisture Content in Oil-Paper Bushings Using Statistical Indicators Based on Frequency Domain Spectroscopy

Ansari

Vahedi

Khlyupin

et al. 2021

Electromechanics and Robotics

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Condenser bushings are considered the Achilles' heel of power transformers because most of the explosions of transformers relate to their bushings' failure. Typical bushings monitoring methods measure the tan delta, power factor, and bushings' capacitance in line frequency. In contrast, the dielectric frequency response (DFR) or the frequency domain spectroscopy (FDS) measures these parameters over a wide frequency range. Some studies have revealed that the FDS curves have distinguished data that help detect bushing failures in their onset. However, there has not been a standard FDS interpretation method. Human experts' opinions play a considerable role in the interpretation process. In this paper, a finite element method model of a 96 kV oil-impregnated paper bushing is built with different OIP moisture content. The FDS test is simulated under these moisture levels. Seven twoarray and six one-array statistical indices are introduced to interpret the FDS results. The results have shown that all six one-array statistical indices, apart from average deviation (AVEDEV) and standard deviation (SD), can be perfect indicators of moisture levels of the OIP. Moreover, they can be used to assess the moisture content of the OIP bushings, and human errors are eliminated using this method.

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Section: Fem Model Of Oip Bushingmentioning

confidence: 89%

“…The results indicate that the moisture content in OIP bushings can be estimated by their proposed method. Several kinds of literature like [15][16][17][18][19][20][21] dispute the FDS method's preference over the typical tests. However, none of those works establish a comprehensive instruction for FDS result interpretation.…”

Section: Introductionmentioning

confidence: 99%

Diagnosis of Moisture Content in Oil-Paper Bushings Using Statistical Indicators Based on Frequency Domain Spectroscopy

Ansari

Vahedi

Khlyupin

et al. 2021

Electromechanics and Robotics

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“…The key connection component between the power transformer and the grid is bushing. Among them, the capacitive oil-paper bushing plays a vital role in the safe and stable operation of power systems [1][2][3]. Moisture is one of the most important factors affecting the insulation state of bushing [4,5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation method for moisture content of oil‐paper insulation based on segmented frequency domain spectroscopy: From curve fitting to machine learning

Yao

Ding

et al. 2021

IET Science Measure & Tech

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In recent years, frequency domain spectroscopy (FDS) is often used to evaluate oil paper insulation state in power transformer bushing. But it is still very difficult to evaluate the moisture content accurately and quickly. In order to solve this problem, this paper proposes an intelligent algorithm based on random forest regression (RFR) to construct an efficient evaluation method through segmented FDS curves. Furthermore, the characteristics of FDS curves were studied and the intelligent method was compared with support vector regression (SVR) and deep neural networks (DNN). The results show that the dielectric loss, the real part and imaginary part of complex capacitance all move upward with the moisture increasing, so they can be used as the input feature of the evaluation model; The moisture content evaluation accuracy of the RFR model in the whole frequency band is higher than that of SVR and DNN models; With the increase of lower cut off frequency (FDS test stop frequency), the FDS test time is greatly shortened, and the accuracy of the RFR model can still meet the evaluation requirements. Therefore, the data in a compromise frequency band can be used to evaluate the moisture content of oil paper insulation accurately and quickly. How to cite this article: Yao H, Mu H, Ding N, et al.: Evaluation method for moisture content of oil-paper insulation based on segmented frequency domain spectroscopy: From curve fitting to machine learning.

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“…IEC 60137 standard specifies the calculation method for the hot spot temperature of conventional HVAC bushings. However, the current-carrying connection structure and operating conditions of the RIP valve side bushing are different from those of HVAC bushings, and there is a big difference between the calculation result of the hot spot temperature value and the actual value [19][20][21]. Despite having passed the temperature rise test, internal breakdown failures of RIP valve side bushings, caused by overheating under long-term load current [22][23][24], might still happen.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Disposal of Typical Breakdown Failure for Resin Impregnated Paper Bushing in the Valve Side of HVDC Converter Transformer

Tang

Chen

et al. 2019

Energies

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This paper presents analysis, diagnosis and disposal with a typical internal breakdown failure of the resin impregnated paper (RIP) valve side bushing in high voltage direct current (HVDC) converter transformer. Based on the analysis of fault current characteristics at the time of the RIP valve side bushing failure, and field test results of insulation parameters, a method of diagnosing typical breakdown failures of valve side bushings is proposed. Through disassembly inspection of the internal overheating and arcing traces on the failure bushing, the root cause of this typical breakdown failure is found, which is upper axial flashover along the RIP condenser/SF6 interface caused by the abnormal contact of two current-carrying conductive tubes. Temperature distribution inside the bushing with an abnormal contact resistance between the copper conductive tube and aluminum conductive tube under different load current is simulated by using the finite element method. An special device is also developed for repairing defective bushing on-site, and 75 bushings with conductive contact defects have been repaired on the premise of not pushing converter transformers away from the valve hall and even without pulling out defective bushings.

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Detection of conductive layers short circuit in HV condenser bushings using Frequency Domain Spectroscopy

Cited by 16 publications

References 9 publications

Diagnosis of Moisture Content in Oil-Paper Bushings Using Statistical Indicators Based on Frequency Domain Spectroscopy

Diagnosis of Moisture Content in Oil-Paper Bushings Using Statistical Indicators Based on Frequency Domain Spectroscopy

Evaluation method for moisture content of oil‐paper insulation based on segmented frequency domain spectroscopy: From curve fitting to machine learning

Analysis and Disposal of Typical Breakdown Failure for Resin Impregnated Paper Bushing in the Valve Side of HVDC Converter Transformer

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