2022 9th International Conference on Condition Monitoring and Diagnosis (CMD)最新文献

100MVA Non-Uniform Heat Losses Study 100MVA非均匀热损失研究

2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) Pub Date : 2022-11-13 DOI: 10.23919/CMD54214.2022.9991711

R. Altay, P. J. Quintanilla, A. Ortiz, F. Delgado, A. Koseoglu

引用次数: 0

A study on the control of PDIV and the magnitude for partial discharge models 局部放电模型的PDIV控制及幅度研究

2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) Pub Date : 2022-11-13 DOI: 10.23919/CMD54214.2022.9991650

Chanyeong Lee, S. Yoon, Geon-Min Park, Jeongtae Kim

引用次数: 0

Superposition of Time-dependent Data for Accelerated Aging of Nuclear Power Plant Cables and Its Validity 核电厂电缆加速老化时相关数据的叠加及其有效性

2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) Pub Date : 2022-11-13 DOI: 10.23919/CMD54214.2022.9991591

Y. Ohki, N. Hirai, S. Okada

引用次数: 2

Investigating the Effect of Aging on Space Charge Dynamics in Oil-Impregnated Paper Insulation 老化对油浸纸绝缘空间电荷动力学影响的研究

2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) Pub Date : 2022-11-13 DOI: 10.23919/CMD54214.2022.9991442

Chinmay Y. Jani, S. C. Vora

{"title":"Investigating the Effect of Aging on Space Charge Dynamics in Oil-Impregnated Paper Insulation","authors":"Chinmay Y. Jani, S. C. Vora","doi":"10.23919/CMD54214.2022.9991442","DOIUrl":"https://doi.org/10.23919/CMD54214.2022.9991442","url":null,"abstract":"The performance of the power apparatus is qualitatively influenced by the state of the insulation system which ages with the service life. The aged state of insulation governs the charge injection, charge formation, and charge transport within it and may further stress the insulation electrically. Therefore it is inevitable to examine the space charge dynamics to monitor the health of the insulation. The Kraft paper samples impregnated in different aged oils are used to investigate the relevance of the space charge behavior with aged states of oil. From the available direct measurement techniques, a widely adopted PEA (Pulsed Electro-Acoustic) technique is used to estimate the trapped charge density and electric field distribution across the test samples. A noticeable space charge density and subsequent electric field enhancement are observed within fresh (unaged) oil-impregnated sample if compared with the aged oil-impregnated paper samples. Recombination of injected charges owing to the conductivity of aged oil, filled in the fibrous cellulose voids is accounted for the same. However, the electrical breakdown of the most aged oil-impregnated paper sample at lower applied voltage is observed which is followed by the less aged oil-impregnated samples. The space charge behavior in oil-impregnated paper insulation and the insulation breakdown is the manifestation of aged states of oil.","PeriodicalId":196825,"journal":{"name":"2022 9th International Conference on Condition Monitoring and Diagnosis (CMD)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114143655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance Evaluation of AI-based Algorithms for Condition Assessment of Power Components 基于人工智能的功率元件状态评估算法的性能评估

2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) Pub Date : 2022-11-13 DOI: 10.23919/CMD54214.2022.9991719

H. Kumar, M. Shafiq, K. Kauhaniemi

{"title":"Performance Evaluation of AI-based Algorithms for Condition Assessment of Power Components","authors":"H. Kumar, M. Shafiq, K. Kauhaniemi","doi":"10.23919/CMD54214.2022.9991719","DOIUrl":"https://doi.org/10.23919/CMD54214.2022.9991719","url":null,"abstract":"This study compares the performance of different artificial intelligence (AI) based algorithms/ classifiers used for partial discharge (PD) classification during insulation diagnostics in power components. During PD measurements, a considerable amount of data is collected, and processing such a huge amount of data is time-consuming and expensive. The useful PD signals can be extracted from the measurements, and AI-based algorithms can be used to process those signals for classification and diagnostics purposes. In this work, the data is collected from three different PD sources, namely, corona, internal, and surface in the high voltage laboratory. Each measurement consists of the PD activity captured in the form of power frequency cycles. The single PD pulses are extracted from the measured signals using the segmentation method. For features extraction, at first discrete wavelet transform (DWT) technique is applied on single pulses, and then statistical parameters (mean, standard deviation, skewness, and kurtosis) are applied to the extracted features. To classify different PD sources, two different classifiers, support vector machine (SVM) and k-nearest neighbors (KNN) with their types, are applied to extracted features. The performance of each classifier is evaluated using the accuracy performance indicator by varying the amount of input PD data from each PD source. The developed understanding will enable researchers/asset managers to extract the required amount of data from the field measurements.","PeriodicalId":196825,"journal":{"name":"2022 9th International Conference on Condition Monitoring and Diagnosis (CMD)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117101993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Faulty Class Diagnosis of Three Phase Induction Motor Bearing Using Stator Current Spectral Features and Machine Learning Algorithms 基于定子电流谱特征和机器学习算法的三相异步电机轴承故障分类诊断

2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) Pub Date : 2022-11-13 DOI: 10.23919/CMD54214.2022.9991672

Kenichi Yatsugi, Shrinathan Esaki Muthu Pandara Kone, Yukio Mizuno

{"title":"Faulty Class Diagnosis of Three Phase Induction Motor Bearing Using Stator Current Spectral Features and Machine Learning Algorithms","authors":"Kenichi Yatsugi, Shrinathan Esaki Muthu Pandara Kone, Yukio Mizuno","doi":"10.23919/CMD54214.2022.9991672","DOIUrl":"https://doi.org/10.23919/CMD54214.2022.9991672","url":null,"abstract":"Induction motors are widely used in various industries because of their robustness, which makes them attractive for applications in harsh environments. Fault detection is a topic of increasing interest, particularly for bearing faults. Various methods of bearing fault diagnosis have been proposed, including vibration, acoustic, and current signature analysis. To predict the repercussions of bearing faults, the detection of the fault class and number of faults is of particular interest. However, the above diagnostic methods only consider a single bearing fault. In this study, inclusive diagnoses were performed for detecting the class (i.e., holes and scratches) and number of faults by using the frequency-domain features of the load current. In experiments, faults of different classes and numbers were introduced to the outer raceway of bearings and tested at various load levels. The sideband frequency components of the load current were affected by the fault class and number. A support vector machine was applied to fault diagnosis using the sideband frequency components as features. Electromagnetic simulations suggested that the dependence of the feature distribution on the fault class and number could be attributed to the effect of the eddy current on the outer raceway of the bearing. The results demonstrated the robustness of the proposed diagnostic method against the class and number of bearing faults.","PeriodicalId":196825,"journal":{"name":"2022 9th International Conference on Condition Monitoring and Diagnosis (CMD)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128214068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Operation Characteristics of ±35 kV MVDC Pilot System Based on PSCAD/EMTDC 基于PSCAD/EMTDC的±35kv MVDC中试系统运行特性

2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) Pub Date : 2022-11-13 DOI: 10.23919/CMD54214.2022.9991652

Hu-Dong Lee, Seong-Hyun Kang, D. Oh, Seong-doo Lee, Soo-Man Park, Byeong-Seok Park

{"title":"Operation Characteristics of ±35 kV MVDC Pilot System Based on PSCAD/EMTDC","authors":"Hu-Dong Lee, Seong-Hyun Kang, D. Oh, Seong-doo Lee, Soo-Man Park, Byeong-Seok Park","doi":"10.23919/CMD54214.2022.9991652","DOIUrl":"https://doi.org/10.23919/CMD54214.2022.9991652","url":null,"abstract":"This paper performs modeling of the ±35kV MVDC(medium voltage direct current) pilot system consisting of distribution substation, MVDC station and PV(photovoltaic) system based on PSCAD/EMTDC to evaluate the facility protection and system effect to MVDC pilot system. From the simulation results of the normal and fault state based on the presented modeling, when the MVDC station is operated with a rated capacity, it is confirmed that the effect on the system side was insignificant because most of the circulation current flows to the inner loop circuit. And it is possible to stably operate the MVDC pilot system without exceeding the capacity of distribution line. On the other hand, in case of pole-to-pole short circuit at MVDC line, it is found that the protection function of the MMC(modular multi-level converter) valves in the MVDC station were operated at a high speed immediately after the fault, and discharge of capacitors in the submodules was prevented. Therefore, it is certain that there is no problem in terms of the protection coordination for the demonstration facility because the reduced fault current flowed through the freewheeling diodes and did not exceed the cut-off capacity of circuit breakers in MVDC station and substation.","PeriodicalId":196825,"journal":{"name":"2022 9th International Conference on Condition Monitoring and Diagnosis (CMD)","volume":"125 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128699683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and Corona Aging Studies on Nano alumina/Micro ATH Co-Filled HTV Silicone Rubber Composites 纳米氧化铝/微ATH共填充HTV硅橡胶复合材料的制备及电晕老化研究

2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) Pub Date : 2022-11-13 DOI: 10.23919/CMD54214.2022.9991301

P. Ashitha, S. Akhil, K. P. Meena

{"title":"Preparation and Corona Aging Studies on Nano alumina/Micro ATH Co-Filled HTV Silicone Rubber Composites","authors":"P. Ashitha, S. Akhil, K. P. Meena","doi":"10.23919/CMD54214.2022.9991301","DOIUrl":"https://doi.org/10.23919/CMD54214.2022.9991301","url":null,"abstract":"The study explores the behavior of nano alumina and micro ATH co-filled silicone composites under corona aging. Composites were developed through physical mixing with nano filler loadings levels varied from 0, 3, and 5 phr by weight. The procedure for surface treatment of fillers, and the fabrication method employed is described. Corona aging is achieved in the laboratory using a multipin electrode arrangement at 10 kV arcing voltage, for 50 hours. The effects of surface discharges are evaluated through measurement of static contact angle before and after corona aging. SEM analysis revealed the surface degradation patterns in the composites post corona aging. FTIR analysis is also performed to understand the structural changes that occur after corona aging. Tensile strength and percentage elongation at break is performed to analyze the effects of corona discharges on the bulk mechanical properties. Measurements of volume resistivity before and after corona aging points to the role of nano alumina in resisting the surface degradations. The effect of interface layer in resisting the deleterious effects of corona discharges is briefly discussed. Here, a method of preparation of micro and nano co-filled silicone rubber composites in high temperature vulcanizing rubber matrix is described, with experimental works.","PeriodicalId":196825,"journal":{"name":"2022 9th International Conference on Condition Monitoring and Diagnosis (CMD)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129324581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reconstruction of Partial Discharge Waveform in Mock Simulated of Insulation Joint by Deconvolution Processing 用反卷积处理重建绝缘接头模拟局部放电波形

2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) Pub Date : 2022-11-13 DOI: 10.23919/CMD54214.2022.9991551

Kanta Yoshikawa, Kanata Takeda, T. Kawashima, Y. Murakami, N. Hozumi

{"title":"Reconstruction of Partial Discharge Waveform in Mock Simulated of Insulation Joint by Deconvolution Processing","authors":"Kanta Yoshikawa, Kanata Takeda, T. Kawashima, Y. Murakami, N. Hozumi","doi":"10.23919/CMD54214.2022.9991551","DOIUrl":"https://doi.org/10.23919/CMD54214.2022.9991551","url":null,"abstract":"The partial discharge measurement in the cable is usually carried out by electrically connecting the detector at the terminal or insulation joint. The system has a complicated transfer function from the discharge point to the measurement point. The observed waveform is a convolution of the transfer function and the partial discharge waveform at the discharge point, resulting in a distorted waveform. On the other hand, the waveform characteristics of the partial discharge reflect the electron avalanche process in the discharge space. It may be possible to estimate the condition of defects based on the waveform characteristics. In this study, we constructed the mock model of the insulation joint and reconstructed the partial discharge waveform at the discharge point by deconvolution processing. To obtain the transfer function, it is necessary to input a known pulse and analyze its response. In a cable at a site, it is difficult to input the pulses because the sheathed terminals of the insulation joint are insulated with an insulation coating to ensure system reliability and safety. Therefore, the transfer function was obtained by measuring the impedance from the detector side and analyzing the equivalent circuit. The validity of the transfer function was shown in comparison with the transfer function when directly inputting the pulse to the discharge point. The characteristics of the reconstructed waveform were almost the same regardless of the acquisition method of the transfer function. Furthermore, the difference in the discharge points simulated deterioration can be found based on the characteristics of the reconstructed waveform.","PeriodicalId":196825,"journal":{"name":"2022 9th International Conference on Condition Monitoring and Diagnosis (CMD)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124785105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Establishment of Partial Discharge Database for Identification of Winding Problem of Hydropower Generator 用于水轮发电机绕组问题识别的局部放电数据库的建立

2022 9th International Conference on Condition Monitoring and Diagnosis (CMD) Pub Date : 2022-11-13 DOI: 10.23919/CMD54214.2022.9991623

T. Kuraishi, S. Miyazaki

引用次数: 0