Pub Date : 2018-09-01DOI: 10.1109/CMD.2018.8535740
W. Yan, Liuqing Yang, H. Cui, Zhao Ge, Shijun Li, Shengtao Li
As a potential alternative to mineral oil used in transformer, palm oil is an eco-friendly choice while its aging behavior and internal aging mechanism are still unclear. Since the failure in transformer oil-paper insulation is mainly caused by heat, with the purpose of better understanding the similarities and differences of palm oil compared with mineral oil during transformer operation, oil-papers respectively made from these two oils were thermally aged for different duration and then experimentally analyzed. Through the analysis of experimental results, the following conclusions were drawn. Quite different aging mechanisms were revealed for each oil-paper insulation material. That means mineral oil had been degraded by scission of main chains followed with oxidation, whereas palm oil had been degraded by scission of ester bonds followed with loss of terminal carbonyl. The different degradation mechanisms further lead to different changes in dielectric properties during thermal aging. The electron transition energy of mineral oil is more pronounced with the increase of aging degree. Besides, palm oil has a shorter wetting time in paper, and the local damage can be repaired more easily after partial discharge. On the contrary, longer wetting time of mineral oil in paper relates to easily damaged for mineral oil-paper insulation in partial discharge. This work clearly shows that palm oil should be a good substitute for traditional mineral oil not only is it eco-friendly, but also possesses even better performance to some certain extent.
{"title":"Comparison of Degradation Mechanisms and Aging Behaviors of Palm Oil and Mineral Oil during Thermal Aging","authors":"W. Yan, Liuqing Yang, H. Cui, Zhao Ge, Shijun Li, Shengtao Li","doi":"10.1109/CMD.2018.8535740","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535740","url":null,"abstract":"As a potential alternative to mineral oil used in transformer, palm oil is an eco-friendly choice while its aging behavior and internal aging mechanism are still unclear. Since the failure in transformer oil-paper insulation is mainly caused by heat, with the purpose of better understanding the similarities and differences of palm oil compared with mineral oil during transformer operation, oil-papers respectively made from these two oils were thermally aged for different duration and then experimentally analyzed. Through the analysis of experimental results, the following conclusions were drawn. Quite different aging mechanisms were revealed for each oil-paper insulation material. That means mineral oil had been degraded by scission of main chains followed with oxidation, whereas palm oil had been degraded by scission of ester bonds followed with loss of terminal carbonyl. The different degradation mechanisms further lead to different changes in dielectric properties during thermal aging. The electron transition energy of mineral oil is more pronounced with the increase of aging degree. Besides, palm oil has a shorter wetting time in paper, and the local damage can be repaired more easily after partial discharge. On the contrary, longer wetting time of mineral oil in paper relates to easily damaged for mineral oil-paper insulation in partial discharge. This work clearly shows that palm oil should be a good substitute for traditional mineral oil not only is it eco-friendly, but also possesses even better performance to some certain extent.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"21 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82133309","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}
Pub Date : 2018-09-01DOI: 10.1109/CMD.2018.8535718
Xuhong Wang, Hongyi Huang, Yue Hu, Yupu Yang
Pattern recognition of partial discharge (PD) has various beneficial applications in academia and industry. However, it is hard and expensive to obtain extensively annotated PD data to build a high-performance classification model. Given there is potential to use PD data more effectively, this paper presents a novel data generative model based on generative adversarial networks (GAN). GAN are able to learn deep feature representations of existing PD signals and synthesizes more extensive UHF PD signals. An original PD data set of UHF PD signals is established by the partial discharge experiment. With the result of the original PD signals dataset as baseline, we evaluated the performance of some classifiers on the augmented dataset. The results show that UHF PD classification model benefits from GAN-based data augmentation techniques. Clearly, the GAN-based model has good potential in industry diagnosis of PD, especially when the data are sparse.
{"title":"Partial Discharge Pattern Recognition with Data Augmentation based on Generative Adversarial Networks","authors":"Xuhong Wang, Hongyi Huang, Yue Hu, Yupu Yang","doi":"10.1109/CMD.2018.8535718","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535718","url":null,"abstract":"Pattern recognition of partial discharge (PD) has various beneficial applications in academia and industry. However, it is hard and expensive to obtain extensively annotated PD data to build a high-performance classification model. Given there is potential to use PD data more effectively, this paper presents a novel data generative model based on generative adversarial networks (GAN). GAN are able to learn deep feature representations of existing PD signals and synthesizes more extensive UHF PD signals. An original PD data set of UHF PD signals is established by the partial discharge experiment. With the result of the original PD signals dataset as baseline, we evaluated the performance of some classifiers on the augmented dataset. The results show that UHF PD classification model benefits from GAN-based data augmentation techniques. Clearly, the GAN-based model has good potential in industry diagnosis of PD, especially when the data are sparse.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"599 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81634419","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}
Pub Date : 2018-09-01DOI: 10.1109/CMD.2018.8535907
Yu Zhang, Deyuan Liu, Jiandong Wu, Y. Yin
In a high voltage direct current (HVDC) transmission system, the equipments like cable accessory and bush are quite important. However, the charge behavior in the insulation of these equipments could not be simplified by one-dimensional charge transport model, for the asymmetry of the insulation structure or specific boundary conditions. This paper proposed a simulation method of the charge transport based on two-dimensional unstructured mesh. The charge transport equations refer to the equations of bipolar charge transport model. The finite element method (FEM) is adopted to solve the Poisson equation. The finite volume method (FVM) with a higher-order upwind scheme with limiter is adopted to discretize the charge conservation equation on a cell-centered tessellation. The simulation object of this paper is cable, and it is a new attempt to simulate space charge dynamics of cable insulation in two-dimensional. Although the charge behavior in cable insulation is regarded as one-dimensional in most simulation researches, the charge distribution in cable insulation could be directly measured by experiments. Thus, the accuracy of the simulation method in this paper could be verified by comparing the simulation results from one-dimensional view with the experiment results. With appropriate parameters, the simulation results are consistent with the results of experiments conducted in this study. The simulation method could further be applied to charge behavior simulation in practical insulation structure which call for a two-dimensional model, and has value in design of insulation structure.
{"title":"Charge Transport Simulation in XLPE Cable Insulation Based on Two-dimensional Unstructured Mesh","authors":"Yu Zhang, Deyuan Liu, Jiandong Wu, Y. Yin","doi":"10.1109/CMD.2018.8535907","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535907","url":null,"abstract":"In a high voltage direct current (HVDC) transmission system, the equipments like cable accessory and bush are quite important. However, the charge behavior in the insulation of these equipments could not be simplified by one-dimensional charge transport model, for the asymmetry of the insulation structure or specific boundary conditions. This paper proposed a simulation method of the charge transport based on two-dimensional unstructured mesh. The charge transport equations refer to the equations of bipolar charge transport model. The finite element method (FEM) is adopted to solve the Poisson equation. The finite volume method (FVM) with a higher-order upwind scheme with limiter is adopted to discretize the charge conservation equation on a cell-centered tessellation. The simulation object of this paper is cable, and it is a new attempt to simulate space charge dynamics of cable insulation in two-dimensional. Although the charge behavior in cable insulation is regarded as one-dimensional in most simulation researches, the charge distribution in cable insulation could be directly measured by experiments. Thus, the accuracy of the simulation method in this paper could be verified by comparing the simulation results from one-dimensional view with the experiment results. With appropriate parameters, the simulation results are consistent with the results of experiments conducted in this study. The simulation method could further be applied to charge behavior simulation in practical insulation structure which call for a two-dimensional model, and has value in design of insulation structure.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"35 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81578132","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}
The traditional HTV silicone rubber composite insulators are widely used in power transmission lines at home and abroad due to their excellent hydrophobicity and hydrophobicity. However, with the development of UHV, more and more transmission lines need to cross strong ultraviolet radiation, strong wind sand and bird pecking regions. In this kind of bad climate regions, it is very easy to cause the decline of the external insulation performance of traditional HTV silicone rubber insulators and the damage of materials. Aiming at this situation and combining with the ultraviolet radiation characteristics of high altitude area, UCV is used as ultraviolet light source, and the high polymer composite insulators with strong resistance to ultraviolet, climate and stable mechanical properties provided by the global energy economic institute are selected as the research object. The purpose is to study the aging characteristics of new composite insulators in the high ultraviolet radiation area of the Northwest Plateau. The results show that under the continuous irradiation of UCV short wave ultraviolet light, the tensile strength and hardness of the epoxy material are much higher than that of the silicone rubber. It has better toughness and has reached the purpose of bird proof and tread resistance. However, hydrophobicity is slightly less than silicone rubber material, but compared with traditional epoxy materials, it has made considerable progress to meet outdoor operation requirements.
{"title":"Study on Ultraviolet Aging Properties of High Polymer Composite Insulators","authors":"Xinbo Huang, Hua Gao, Wen Cao, Yi Tian, Wenbo Yang, Zhengkang Yuan","doi":"10.1109/CMD.2018.8535647","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535647","url":null,"abstract":"The traditional HTV silicone rubber composite insulators are widely used in power transmission lines at home and abroad due to their excellent hydrophobicity and hydrophobicity. However, with the development of UHV, more and more transmission lines need to cross strong ultraviolet radiation, strong wind sand and bird pecking regions. In this kind of bad climate regions, it is very easy to cause the decline of the external insulation performance of traditional HTV silicone rubber insulators and the damage of materials. Aiming at this situation and combining with the ultraviolet radiation characteristics of high altitude area, UCV is used as ultraviolet light source, and the high polymer composite insulators with strong resistance to ultraviolet, climate and stable mechanical properties provided by the global energy economic institute are selected as the research object. The purpose is to study the aging characteristics of new composite insulators in the high ultraviolet radiation area of the Northwest Plateau. The results show that under the continuous irradiation of UCV short wave ultraviolet light, the tensile strength and hardness of the epoxy material are much higher than that of the silicone rubber. It has better toughness and has reached the purpose of bird proof and tread resistance. However, hydrophobicity is slightly less than silicone rubber material, but compared with traditional epoxy materials, it has made considerable progress to meet outdoor operation requirements.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"52 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85711715","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}
Pub Date : 2018-09-01DOI: 10.1109/CMD.2018.8535738
Ren Zhigang, Zuo Xinbin, L. Lisheng, Dai Jindun, L. Yadong
To localize the fault in distribution networks effectively, a novel fault location method on wide area measurement systems is proposed. This method takes the advantage of the fastness and reliability of the measured data from the wide area measurement system. An leakage energy function is proposed on the basis of analyzing arc-suppression coil action and the waveform features of faulty phase. For the fault-free section, its energy function shows little difference with the normal working condition when the fault occurs in other sections. And for the faulty section, its energy function will increase and then decrease over time and the peak value is reached from the fault occurring to the arc-suppression coil outputs stable offset current. The proposed method localizes the faulty section according to the characteristic of energy function. And the experiments on PSCAD/EMTEC software manifest the effectiveness of our proposed method.
{"title":"Fault Location Method for Distribution Networks Based on Leakage Energy Function","authors":"Ren Zhigang, Zuo Xinbin, L. Lisheng, Dai Jindun, L. Yadong","doi":"10.1109/CMD.2018.8535738","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535738","url":null,"abstract":"To localize the fault in distribution networks effectively, a novel fault location method on wide area measurement systems is proposed. This method takes the advantage of the fastness and reliability of the measured data from the wide area measurement system. An leakage energy function is proposed on the basis of analyzing arc-suppression coil action and the waveform features of faulty phase. For the fault-free section, its energy function shows little difference with the normal working condition when the fault occurs in other sections. And for the faulty section, its energy function will increase and then decrease over time and the peak value is reached from the fault occurring to the arc-suppression coil outputs stable offset current. The proposed method localizes the faulty section according to the characteristic of energy function. And the experiments on PSCAD/EMTEC software manifest the effectiveness of our proposed method.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"7 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86636425","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}
Pub Date : 2018-09-01DOI: 10.1109/CMD.2018.8535656
Ming Chen, Xuandong Liu, Puming Xu, Tao Wen
Resin-impregnated paper (RIP) bushings have been widely used in power system, however failure caused by local inter-foil insulation deterioration has occurred from time to time, which has seriously affected the safe and stable operation of substations. Due to the damaging effect of partial discharge, the resistance of local inter-foil insulation will gradually decrease, and breakdown may even occur. To study the phenomenon of local inter-foil insulation deterioration of RIP bushing, a test platform is established for 72.5kV RIP transformer bushings, and corresponding frequency-domain dielectric spectroscopy(FDS) test is conducted at room temperature. It is found that the FDS curve of bushing with inter-foil insulation deterioration and breakdown is significantly shifted compared to the normal one. In addition, due to the obvious development process of local inter-foil insulation deterioration of RIP bushings, a simulation model is established in this paper, and the method of changing the local electrical conductivity of local inter-foil insulation material is used to characterize the degree of insulation deterioration, and corresponding FDS response curves are obtained. The results show that with the development of the deterioration of local inter-foil insulation, the C-f and tant5-f curves have obvious transitional processes. In the initial and middle stage of insulation deterioration, the FDS method has higher diagnostic effectiveness than the traditional power frequency dielectric loss method. This article can provide a basic theoretical reference for the on-site diagnosis of local inter-foil insulation deterioration of RIP bushings.
{"title":"Local Inter-foil Insulation Deterioration Diagnosis and Simulation of RIP Bushing Based on FDS Method","authors":"Ming Chen, Xuandong Liu, Puming Xu, Tao Wen","doi":"10.1109/CMD.2018.8535656","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535656","url":null,"abstract":"Resin-impregnated paper (RIP) bushings have been widely used in power system, however failure caused by local inter-foil insulation deterioration has occurred from time to time, which has seriously affected the safe and stable operation of substations. Due to the damaging effect of partial discharge, the resistance of local inter-foil insulation will gradually decrease, and breakdown may even occur. To study the phenomenon of local inter-foil insulation deterioration of RIP bushing, a test platform is established for 72.5kV RIP transformer bushings, and corresponding frequency-domain dielectric spectroscopy(FDS) test is conducted at room temperature. It is found that the FDS curve of bushing with inter-foil insulation deterioration and breakdown is significantly shifted compared to the normal one. In addition, due to the obvious development process of local inter-foil insulation deterioration of RIP bushings, a simulation model is established in this paper, and the method of changing the local electrical conductivity of local inter-foil insulation material is used to characterize the degree of insulation deterioration, and corresponding FDS response curves are obtained. The results show that with the development of the deterioration of local inter-foil insulation, the C-f and tant5-f curves have obvious transitional processes. In the initial and middle stage of insulation deterioration, the FDS method has higher diagnostic effectiveness than the traditional power frequency dielectric loss method. This article can provide a basic theoretical reference for the on-site diagnosis of local inter-foil insulation deterioration of RIP bushings.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"28 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80448425","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}
Pub Date : 2018-09-01DOI: 10.1109/CMD.2018.8535987
Dowon Kim, A. Abu‐Siada
Partial discharge (PD) analysis is one of the most reliable non-destructive tests to clarify the quality of the insulation and to evaluate the life expectancy of high voltage (HV) devices. To perform PD testing and analysis accurately, it is important to select the correct method with respect to various sorts of the specimen. This paper aims at supporting HV engineers and asset managers to select a correct PD method and to make a clear maintenance plan. Also, this paper presents the difference between on and off PD analysis techniques, and the proper PD testing for rotating machines, switchgears and power cables with a case study and practical suggestions.
{"title":"Partial Discharge Analysis on-site in Various High Voltage Apparatus","authors":"Dowon Kim, A. Abu‐Siada","doi":"10.1109/CMD.2018.8535987","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535987","url":null,"abstract":"Partial discharge (PD) analysis is one of the most reliable non-destructive tests to clarify the quality of the insulation and to evaluate the life expectancy of high voltage (HV) devices. To perform PD testing and analysis accurately, it is important to select the correct method with respect to various sorts of the specimen. This paper aims at supporting HV engineers and asset managers to select a correct PD method and to make a clear maintenance plan. Also, this paper presents the difference between on and off PD analysis techniques, and the proper PD testing for rotating machines, switchgears and power cables with a case study and practical suggestions.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"116 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73055045","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}
Pub Date : 2018-09-01DOI: 10.1109/CMD.2018.8535965
Zhiyu Cao, Yewen Zhang, Cong Guo, F. Zheng, Z. An, S. Holé, Enke Yu, Xinlong Zheng, Zhien Zhu, Liming Yang
Because of the limitation of technical level and experimental conditions, the space charge distributions in the full-size HVDC cables has never been obtained by the laser PWP method. In this paper, a space charge test system was designed for the space charge measurement of the full-size long cable. To verify the capabilities of the system, space charge distributions in full-size 10m long cable with 15mm thick insulation were measured, while the voltage range was setting from +50kV to +200kV. Then the space charge injection experiment is carried out, and the applied voltage is maintained +200kV, which lasted for 48 hours and the space charge injection data are obtained.
{"title":"Space Charge Measurement System Based on Laser PWP Method for the Full-size Long HVDC Cable","authors":"Zhiyu Cao, Yewen Zhang, Cong Guo, F. Zheng, Z. An, S. Holé, Enke Yu, Xinlong Zheng, Zhien Zhu, Liming Yang","doi":"10.1109/CMD.2018.8535965","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535965","url":null,"abstract":"Because of the limitation of technical level and experimental conditions, the space charge distributions in the full-size HVDC cables has never been obtained by the laser PWP method. In this paper, a space charge test system was designed for the space charge measurement of the full-size long cable. To verify the capabilities of the system, space charge distributions in full-size 10m long cable with 15mm thick insulation were measured, while the voltage range was setting from +50kV to +200kV. Then the space charge injection experiment is carried out, and the applied voltage is maintained +200kV, which lasted for 48 hours and the space charge injection data are obtained.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"21 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74186772","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}
Pub Date : 2018-09-01DOI: 10.1109/CMD.2018.8535862
Xinbo Huang, Xiang Wang, Yi Tian
The intelligent fault diagnosis of power transformer is the main link to promote the development of smart grids, but the traditional single intelligent diagnosis algorithms cannot process the huge amount of the incomplete fault information of the transformers effectively, resulting in low accuracy of fault diagnosis. Therefore, combining the dissolved gas analysis (DGA) technology, a transformer fault diagnosis method based on Gray Wolf Optimization algorithm (GWO) optimized hybrid kernel extreme learning machine is proposed in this paper. Firstly, based on Mercer's theorem, a hybrid kernel extreme learning machine model is constructed by combining the local radial basis kernel function and the global polynomial kernel function. Secondly, the parameters of hybrid kernel function can be optimized by the GWO algorithm. Meanwhile, the Logistic chaotic map is used to generate the initial population parameters of the GWO algorithm, which makes the distribution of initial population parameters as evenly as possible to avoid adverse effect of convergence speed and the optimization results. The results show that the presented algorithm in this paper improves the accuracy of transformers fault diagnosis compared with the BP neural network and the extreme learning machine algorithm, which has the strong learning ability and generalization performance.
{"title":"Research on Transformer Fault Diagnosis Method based on GWO Optimized Hybrid Kernel Extreme Learning Machine","authors":"Xinbo Huang, Xiang Wang, Yi Tian","doi":"10.1109/CMD.2018.8535862","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535862","url":null,"abstract":"The intelligent fault diagnosis of power transformer is the main link to promote the development of smart grids, but the traditional single intelligent diagnosis algorithms cannot process the huge amount of the incomplete fault information of the transformers effectively, resulting in low accuracy of fault diagnosis. Therefore, combining the dissolved gas analysis (DGA) technology, a transformer fault diagnosis method based on Gray Wolf Optimization algorithm (GWO) optimized hybrid kernel extreme learning machine is proposed in this paper. Firstly, based on Mercer's theorem, a hybrid kernel extreme learning machine model is constructed by combining the local radial basis kernel function and the global polynomial kernel function. Secondly, the parameters of hybrid kernel function can be optimized by the GWO algorithm. Meanwhile, the Logistic chaotic map is used to generate the initial population parameters of the GWO algorithm, which makes the distribution of initial population parameters as evenly as possible to avoid adverse effect of convergence speed and the optimization results. The results show that the presented algorithm in this paper improves the accuracy of transformers fault diagnosis compared with the BP neural network and the extreme learning machine algorithm, which has the strong learning ability and generalization performance.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"34 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81139974","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}
Pub Date : 2018-09-01DOI: 10.1109/CMD.2018.8535844
Yunkun Deng, Fengli Li, Zhonghua Sun, Dada Wang, Yi Ma, Y. Yin, Jiandong Wu
The primary insulating material in the converter transformer, oil-impregnated paper, is subject to a complex electric field, mainly including the direct current (DC) stress, the alternating current (AC) stress and relatively minor harmonic stress. In order to investigate the effect of electrical-thermal aging on the oil-paper insulation properties, the breakdown voltage and polarization-depolarization current of oil-impregnated paper samples with different aging conditions were measured respectively. Firstly, the operation electrical field of transformer valve windings was simulated in the PSCAD software, which manifested the proportion of the prominent components-DC stress and AC stress. In terms of the simulation result, the oil-paper sample with different aging hours were prepared by conducting the laboratory accelerated electrical-thermal aging tests. Afterwards, the polarization-depolarization current of samples aged 0 h, 48 h, 72 h, 96 h and 120 h were measured. It showed that electrical-thermal aging caused the deterioration of oil-impregnated paper, resulting in the increase of polarization-depolarization current.
{"title":"Research on Polarization-Depolarozation Current of Oil-impregnated Paper after Electrical-thermal Aged","authors":"Yunkun Deng, Fengli Li, Zhonghua Sun, Dada Wang, Yi Ma, Y. Yin, Jiandong Wu","doi":"10.1109/CMD.2018.8535844","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535844","url":null,"abstract":"The primary insulating material in the converter transformer, oil-impregnated paper, is subject to a complex electric field, mainly including the direct current (DC) stress, the alternating current (AC) stress and relatively minor harmonic stress. In order to investigate the effect of electrical-thermal aging on the oil-paper insulation properties, the breakdown voltage and polarization-depolarization current of oil-impregnated paper samples with different aging conditions were measured respectively. Firstly, the operation electrical field of transformer valve windings was simulated in the PSCAD software, which manifested the proportion of the prominent components-DC stress and AC stress. In terms of the simulation result, the oil-paper sample with different aging hours were prepared by conducting the laboratory accelerated electrical-thermal aging tests. Afterwards, the polarization-depolarization current of samples aged 0 h, 48 h, 72 h, 96 h and 120 h were measured. It showed that electrical-thermal aging caused the deterioration of oil-impregnated paper, resulting in the increase of polarization-depolarization current.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"9 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82468570","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}
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