2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)最新文献

{"title":"Monitoring the Sol and Gel in Natural Esters under Open Beaker Thermal Aging","authors":"U. Rao, I. Fofana","doi":"10.1109/catcon52335.2021.9670498","DOIUrl":"https://doi.org/10.1109/catcon52335.2021.9670498","url":null,"abstract":"The application of natural ester-based dielectric liquids for liquid-filled transformers is a topic of high concern for transformer owners and utilities. The potential advantages of being biodegradable, high flash point, good dielectric properties, and high moisture tolerance encapsulated natural esters to be a promising solution for transformer insulation systems. Several research reports are affirmative towards the usage of natural esters in transformers. Meanwhile, the poor oxidation stability of natural esters is a challenge that needs to be emphasized. Natural esters develop a polymerized aging product known as gelling under the influence of oxygen. Before gelling occurs, the first thing is to form sol in the bulk of the liquid that influences the liquid viscosity and further accelerates oxidation. Thus, in this paper, a natural ester is subjected to accelerated thermal aging to observe and understand the formation of sol. However, accelerated thermal stressing is continued till gelling is evident in the liquid. The changes in liquid absorbance with aging and the level after which sol is developed is reported. The changes in the viscosity of the natural ester with the formation of sol and gel are also reported. Further, the compositional changes of the liquid that are responsible for the formation of sol are reported using FTIR analysis. Finally, the breakdown failure rate of the completely gelled natural ester is reported to understand the influence of the gelling on the liquid breakdown strength.","PeriodicalId":162130,"journal":{"name":"2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"30 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125232141","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}

{"title":"Analyzing the growth of XLPE insulation damage under the application of repeated lightning impulses using nonlinear models","authors":"V. M. S., S. K., D. Mishra, A. S","doi":"10.1109/catcon52335.2021.9670530","DOIUrl":"https://doi.org/10.1109/catcon52335.2021.9670530","url":null,"abstract":"The most commonly used insulation systems in submarine cables and substations nowadays are cross-linked polyethylene(XLPE). The expected life of this insulation is reduced due to the phenomenon called treeing. The reduction in life of the insulation is mainly due to the overvoltage stresses such as lightning strokes affecting the insulation. The growth characteristics of trees under repeated lightning impulses are investigated using nonlinear models in this paper. After solving Poisson’s equations for the required geometry of the XLPE insulation in COMSOL multiphysics, the electric field values obtained are utilized to model the growth characteristics. Repeated lightning impulses are applied as the input to the model. The growth of the tree in the insulation is analyzed by developing a program based on a probabilistic approach. The analysis of the key parameters of insulation damage is assessed by histogram plots.","PeriodicalId":162130,"journal":{"name":"2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"12 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120934157","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}

{"title":"Cytotoxic efficiency of pulsed electric field treated Plectranthus amboinicus leaf extract on lung (A549) cancer cell lines","authors":"Roopashree Sathyanathan, G. Varadarajan","doi":"10.1109/catcon52335.2021.9670531","DOIUrl":"https://doi.org/10.1109/catcon52335.2021.9670531","url":null,"abstract":"In a controlled environment, cytotoxicity of Plectranthus amboinicus leaves against a humanoid lung malignant cell lines were surveyed(A549). The Bioactive substances contained in leaf extract were determined using a qualitative screening method. Quantification of bioactive substances such as phenol, flavonoids, and anticancer activities was performed. The ethanolic leaf extracts were extracted using the Soxhlet method and then exposed to an electric pulse treatment (PEF) using a Multiporator with an E field ranging from 200 to 2.5kV/cm, a constant pulse interval of 100ms, and a constant pulse length of 100s. The electrical pulse impact on anticancer and action of phenol in leaf was evaluated in comparison to untreated extract. The phenolic activity was assessed using the Folin-Ciocalteu’s technique, whereas flavonoid activity was determined using the Aluminum chloride method, with PEF treated extracts exhibiting enhanced phenolic activity. This study used an electric field of 1kV/cm, a pulse duration of 100 seconds, and eight pulses. After 24 hours of treatment, the viability of A549 cell lines exposed to varied concentrations of PEF treated extract was evaluated using the MTT test. With 0.001μg/ml, maximum cell viability was 81 percent (minimum cell death was 18 percent), while with 100μg/ml, minimum cell viability was 26 percent (highest cell death was 73 percent). Cell death is 73 percent for PEF treated samples with a concentration of 100μg/ml, and 69 percent for untreated samples with a concentration of 250μg/ml. We can deduct from this that the PEF-treated P.amboinicus extract is a good anticancer agent since it causes more cell death than the untreated extract.","PeriodicalId":162130,"journal":{"name":"2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124728540","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}

{"title":"Predicting the Accuracy of Transformer Oil Classification by Goodness-of-fit Statistics","authors":"Lakshmi Tharamal, P. P., S. K","doi":"10.1109/catcon52335.2021.9670520","DOIUrl":"https://doi.org/10.1109/catcon52335.2021.9670520","url":null,"abstract":"Classification of transformer oil as per IEC C.57.106-2006 is performed using Partial Discharge (PD) measurements. Fresh and used oil samples procured from the State Electricity Board are used for the classification. Histogram Similarity Measures (HSM) like Kolmogorov Smirnov (KS) test, Chi-square test and Cross-correlation are used to find the similarity between the histograms of the PD data and classify them. Subsequently, to predict the accuracy of the decision made while classifying, a probability is associated with each classification. The test statistics of HSM are fitted using Beta, KS and Chi-square distributions and their class likelihood probabilities are evaluated. Eventually, the class assignment and related probabilities from different PD measurements are added up to get a final class assignment and probability value for the test oil sample.","PeriodicalId":162130,"journal":{"name":"2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115082703","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}

{"title":"Analysis of Root Cause of Failure of a Turbo Generator Stator Winding","authors":"D. K. Puhan, Thirumurthy, Rajat Sharma, K. Meena","doi":"10.1109/catcon52335.2021.9670495","DOIUrl":"https://doi.org/10.1109/catcon52335.2021.9670495","url":null,"abstract":"The important components that have direct bearing on the operational reliability and life of the machine are stator winding, stator core and rotor winding. The stator winding is the most important and expensive part of the generator where full power is generated. The life of the stator is affected by one or more combinations of various stresses like electrical, thermal, mechanical and environmental at any point in time during operation of the machine. In addition to these stresses, the stator insulation is also subjected to unforeseen stresses during transient over voltage conditions. Steep fronted over voltages generated during switching actions and system faults, propagate through the winding and have deleterious effects on the insulation. Since the mechanical stresses are relatively higher in turbo generators many of the stator winding failures are mechanically induced electrical failures. Some of the degradation processes include loosening of wedges and coils, occurrence of slot and end winding discharges, erosion stress grading and corona shielding coatings, de-lamination of insulation, de-bonding of copper from insulation and the like.In this paper the data obtained from the visual inspection and examination on the stator winding, and diagnostic tests conducted on the healthy phase of a 250 MW, 16.5 kV failed turbo generator have been analyzed to find the root cause of premature failure. The machine had completed a service life of about 10 years and had run for about 60,000 hours before it failed with a stator earth fault. Considering a notional design life of 35 years, it was vital for the asset managers to know the root cause of failure. Findings of the visual inspection and examination on the stator winding, and diagnostic tests conducted on the healthy phase have been discussed in detail. It is concluded that the root cause of failure is stator end winding discharges/electrical tracking. In particular, the causes of end winding discharges are contamination of the end winding due to condensed oil fumes and powder generated by insulation fretting. The insulation fretting is due to end winding vibration.","PeriodicalId":162130,"journal":{"name":"2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116443480","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}

{"title":"Modelling and Implementation of an Active EMI Filter for Conducted EMI Noise Reduction","authors":"Catharine Elizabeth Kurien, T. Sindhu, Deepu E Koshy","doi":"10.1109/catcon52335.2021.9670535","DOIUrl":"https://doi.org/10.1109/catcon52335.2021.9670535","url":null,"abstract":"The analysis and design of an active electromagnetic interference (EMI) filter (AEF) for the reduction of conducted EMI noise in switched-mode power converters are presented in this paper. A brief overview of the many forms of AEF is provided. A voltage sensing voltage compensation (VSVC) type active EMI filter is implemented for a buck converter in PSIM software. This feed-forward filter can replace a conventionally used bulky passive EMI filter and can successfully reduce the EMI. The filter also does not affect the stability of the circuit. The filter is implemented for two types of circuits, i.e., for open loop as well as closed loop operation of buck converter. For the closed loop operation, a proportional integral (PI) controller is implemented. In these two instances, the properties and behavior of the VSVC-type AEF are studied and compared.","PeriodicalId":162130,"journal":{"name":"2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128750318","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}

{"title":"Aging Performance of Transformer State of Art Review Oil Insulation- State of Art Review","authors":"Nisha Thanua, Ganesh Balu Kumbhar","doi":"10.1109/catcon52335.2021.9670470","DOIUrl":"https://doi.org/10.1109/catcon52335.2021.9670470","url":null,"abstract":"The objective of this review paper is to understand the aging aspects of the transformer insulating oil by studying the aging performance of two widely used liquid dielectrics ie., mineral oil and natural ester oils along with paper as solid insulation. The performance of the power transformer is mainly decided by the proper working of its insulation. Thus monitoring the performance of insulating oil with aging results in more reliable working of the transformers. Here the aging mechanism of the insulating oil is briefly discussed alongside various study done in understanding the aging performance of both the liquid dielectrics using various methods and thus the degradation rate of both the dielectrics are examined. Naturally available ester oils are found to have better performance in comparison to mineral oil and also the paper degradation rate was found to be slower in these ester oils. Various methods used in monitoring the aging phenomenon are discussed briefly which compares the aging markers of both the oils.","PeriodicalId":162130,"journal":{"name":"2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126922449","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}

{"title":"Anti-Cancerous effect of PEF treated Aloe barbadensis miller extract on MCF – 7 Breast cancer cell lines","authors":"Sowmya D, G. Varadarajan","doi":"10.1109/catcon52335.2021.9670523","DOIUrl":"https://doi.org/10.1109/catcon52335.2021.9670523","url":null,"abstract":"Many of the naturally occurring plants have the tendency to treat all metabolic related disorders. Aloe vera is one of the most commonly found herb in daily life. Its phytochemicals are effective in treating and inhibiting the cancer activities. This study deals with analyzing the nature of ductal carcinoma MCF – 7 breast cancer cell lines when tested with the PEF treated aloe vera extract and the results are compared with the percentage of cell viability when treating the same cell lines with untreated aloe vera extract. The phytochemical constituents are checked for their enhancement when ethanolic Aloe vera leaves are subjected to hot solvent extraction. PEF treatment is given to the extract with the electric field range of 1200V/cm to 1400V/cm with 8 number of electric pulses and with triplet experiments. PEF treatment on aloe vera extract showed that there is about 45% enhancement in phytochemicals. The final results of the study indicated that, 24 hours treated MCF – 7 ductal carcinoma breast cancer cell lines showed about 73% of cell death with 100ug/mL concentration of drug, and there is also enhancement of phytochemical constituents in the aloe extract.","PeriodicalId":162130,"journal":{"name":"2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126999546","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}

{"title":"Influence of Nanoparticles on Surface Discharge in Epoxy Based Dielectrics","authors":"D. P, P. Preetha","doi":"10.1109/catcon52335.2021.9670541","DOIUrl":"https://doi.org/10.1109/catcon52335.2021.9670541","url":null,"abstract":"Surface discharge phenomenon in epoxy alumina nanocomposites have been investigated here, by way of preparing epoxy nanocomposites containing alumina nanoparticles in different weight proportions of 1%, 2% and 5% and subjecting them to electrical ageing for a predetermined duration. The partial discharge patterns at intervals of 4 hours have been recorded for those insulator samples and the pure epoxy sample. Then the extent of degradation of those insulator samples has been brought out using the analysis technique known as Optical Surface Profilometry. The extent of degradation due to surface discharge is seen to be decreasing considerably with increase in filler loading.","PeriodicalId":162130,"journal":{"name":"2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"32 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120922596","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}

{"title":"Influence of Nano Zinc Oxide on EVA Encapsulant Material for Photovoltaic Applications","authors":"M. Naskar, Dharmendra H M, Meena K P","doi":"10.1109/catcon52335.2021.9670503","DOIUrl":"https://doi.org/10.1109/catcon52335.2021.9670503","url":null,"abstract":"Ethylene vinyl acetate (EVA)/ Zinc oxide (ZnO) nanocomposites with three different nano filler loadings were prepared. The insulation property was investigated and the results were compared. These studies revealed that volume resistance increased after inclusion of nano ZnO (n-ZnO) in EVA matrix. Transmission electron microcopy (TEM) images confirmed the existence of good dispersion of n-ZnO in the EVA matrix and Differential Scanning Calorimetry (DSC) results revealed that the crystallization behavior of EVA did not significantly affected by the presence of n-ZnO. Thermo-gravimetric Analysis (TGA) verified thermal stability of the EVA/ 0.1wt% n-ZnO nanocomposite was noticeably improved by ~52 °C, in comparison with pristine EVA. Under cone calorimetry heat release rate study, it was noticed that the ignition time of pristine EVA increased from 29 Seconds to 61 seconds for EVA/ 0.1wt% n-ZnO nanocomposite. Mechanical behavior seems to be maximized for EVA/ 0.1wt% n-ZnO nanocomposite. As the n-ZnO was added, it was observed that the intensity of UV and visible light Transmission is augmented which can enhance the photovoltaic module efficiency.","PeriodicalId":162130,"journal":{"name":"2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134073219","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}