Pub Date : 2021-04-11DOI: 10.1109/ICEMPE51623.2021.9509051
Tonghao Zhou, Jiangyu Liu, Zhe Zhuang, Jiangang Dai, Dehua Zhao, Feng Hou, S. Ji
Current transformer (CT) with the structure of iron-core coil can detect the partial discharge to reflect the insulation state of the equipment, or measure the sweep current in the frequency response method to judge the mechanical state of the transformer winding. In these cases, the CT only need to measure the small current with high frequency in the conductor, but sometimes there will be large power frequency current in the measured conductor. The signal induced by this power frequency current will be superimposed on the output of the CT, so that the high frequency signal is easily submerged in the interference of the power frequency signal. To improve the signal-to-noise ratio of measurement, this paper proposes the double coils compensation method and the double integral resistors method from the perspectives of coil and integral circuit respectively, and conducts experimental verification. The experimental results show that due to the nonlinearity of iron-core, the double coils compensation method cannot obtain satisfactory measurement results. While the double integral resistors method can effectively suppress the interference caused by the power frequency current, and has little effect on the measurement of high frequency current, which significantly improves the signal-to-noise ratio of measurement.
{"title":"Research on the methods of measuring high frequency small current in large power frequency current by current transformer","authors":"Tonghao Zhou, Jiangyu Liu, Zhe Zhuang, Jiangang Dai, Dehua Zhao, Feng Hou, S. Ji","doi":"10.1109/ICEMPE51623.2021.9509051","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509051","url":null,"abstract":"Current transformer (CT) with the structure of iron-core coil can detect the partial discharge to reflect the insulation state of the equipment, or measure the sweep current in the frequency response method to judge the mechanical state of the transformer winding. In these cases, the CT only need to measure the small current with high frequency in the conductor, but sometimes there will be large power frequency current in the measured conductor. The signal induced by this power frequency current will be superimposed on the output of the CT, so that the high frequency signal is easily submerged in the interference of the power frequency signal. To improve the signal-to-noise ratio of measurement, this paper proposes the double coils compensation method and the double integral resistors method from the perspectives of coil and integral circuit respectively, and conducts experimental verification. The experimental results show that due to the nonlinearity of iron-core, the double coils compensation method cannot obtain satisfactory measurement results. While the double integral resistors method can effectively suppress the interference caused by the power frequency current, and has little effect on the measurement of high frequency current, which significantly improves the signal-to-noise ratio of measurement.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"63 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84199061","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 : 2021-04-11DOI: 10.1109/ICEMPE51623.2021.9509095
Zheng Hanyu, Zhang Zhijin, Xu Jun, Wang Xiaojie, J. Xingliang
Taking the 500kV double circuit transmission line in Fujian Province as the research object, the lightning protection performance of the transmission line under the arrangement of porcelain insulators and composite insulators is studied, and the influence of wind speed on its lightning protection performance is analyzed based on the statistical distribution characteristics of wind speed and direction in the jurisdiction. Furthermore, providing a feasible basis for the transformation of 500kV lines into composite insulators in the offshore areas of Fujian Province.
{"title":"Lightning protection performance of 500kV linear tower suspension string composite insulator instead of porcelain insulator","authors":"Zheng Hanyu, Zhang Zhijin, Xu Jun, Wang Xiaojie, J. Xingliang","doi":"10.1109/ICEMPE51623.2021.9509095","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509095","url":null,"abstract":"Taking the 500kV double circuit transmission line in Fujian Province as the research object, the lightning protection performance of the transmission line under the arrangement of porcelain insulators and composite insulators is studied, and the influence of wind speed on its lightning protection performance is analyzed based on the statistical distribution characteristics of wind speed and direction in the jurisdiction. Furthermore, providing a feasible basis for the transformation of 500kV lines into composite insulators in the offshore areas of Fujian Province.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"5 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84253371","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 : 2021-04-11DOI: 10.1109/ICEMPE51623.2021.9509160
P. Jia, Rongjin Huang, Dong Xu, Yongguang Wang, Z. Miao, Laifeng Li
GFRP is widely used in superconducting system. Epoxy resin dopped nanoparticles has a great effect on improving the electrical performance. In this paper, the DC breakdown strength of ZnO/GFRP(0, 1, 3 and 5wt%) was investigated at the room temperature and cryogenic temperature. The ZnO particles were surface modified with the silane coupling agent (KH560), in order to obtain the uniform dispersed composites. The ZnO/GFRP composites were tested in vacuum at 300K and 77K and Weibull distribution was obtained. The results showed that the DC breakdown strength rose with the increase of ZnO content and the low temperature improved breakdown strength.
{"title":"DC Breakdown Strength of ZnO/GFRP at Room Temperature and Cryogenic Temperature","authors":"P. Jia, Rongjin Huang, Dong Xu, Yongguang Wang, Z. Miao, Laifeng Li","doi":"10.1109/ICEMPE51623.2021.9509160","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509160","url":null,"abstract":"GFRP is widely used in superconducting system. Epoxy resin dopped nanoparticles has a great effect on improving the electrical performance. In this paper, the DC breakdown strength of ZnO/GFRP(0, 1, 3 and 5wt%) was investigated at the room temperature and cryogenic temperature. The ZnO particles were surface modified with the silane coupling agent (KH560), in order to obtain the uniform dispersed composites. The ZnO/GFRP composites were tested in vacuum at 300K and 77K and Weibull distribution was obtained. The results showed that the DC breakdown strength rose with the increase of ZnO content and the low temperature improved breakdown strength.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"37 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85028879","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 : 2021-04-11DOI: 10.1109/ICEMPE51623.2021.9509145
Haitian Wang, Yi Luo, T. Fechner, Chong Zhang, Zhengtong Lu, Mingyu Zhou
The cable termination is one of the vulnerable parts of the whole system. For oil-filled terminations, internal breakdown can produce severe damage to the surrounding equipment and human beings. At present, the rated voltage of gas-filled plug-in AC cable terminations is up to 550 kV and a lot of engineering and application experience shows that the gas-filled plug-in cable terminations have the benefits of no isolation liquids, shorter installation time and compacter design. In order to introduce the advantages of plug-in cable termination of AC power systems for DC power systems, it is necessary to carry out simulation modeling research on plug-in DC cable terminations. Based on the accumulated experience in the development of DC cable accessories, in this paper, a model of a 200 kV plug-in DC cable termination is presented and used to simulate the interfacial electric field under typical conditions according to relevant type test standards for DC cable systems.
{"title":"Interface Stress Simulation of 200kV Gas-filled Plug-in DC Cable Termination","authors":"Haitian Wang, Yi Luo, T. Fechner, Chong Zhang, Zhengtong Lu, Mingyu Zhou","doi":"10.1109/ICEMPE51623.2021.9509145","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509145","url":null,"abstract":"The cable termination is one of the vulnerable parts of the whole system. For oil-filled terminations, internal breakdown can produce severe damage to the surrounding equipment and human beings. At present, the rated voltage of gas-filled plug-in AC cable terminations is up to 550 kV and a lot of engineering and application experience shows that the gas-filled plug-in cable terminations have the benefits of no isolation liquids, shorter installation time and compacter design. In order to introduce the advantages of plug-in cable termination of AC power systems for DC power systems, it is necessary to carry out simulation modeling research on plug-in DC cable terminations. Based on the accumulated experience in the development of DC cable accessories, in this paper, a model of a 200 kV plug-in DC cable termination is presented and used to simulate the interfacial electric field under typical conditions according to relevant type test standards for DC cable systems.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"16 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85435929","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 : 2021-04-11DOI: 10.1109/ICEMPE51623.2021.9509048
Z. Li, Chao Gao, Ming Lu, H. Mei, Yansong Wu, Liming Wang
Decay-like fracture is a new kind of fracture phenomena of composite insulator occurring in recent years. Abnormal temperature rise in 500kV composite insulators high-voltage end is found by the infrared temperature measurement before the decay-like fracture occurs. In order to simulate the overheat conditions and carry out artificial accelerated aging tests, an experimental method based on electromagnetic heating is put forward in the paper. A metal defect is put in the interface between silicone rubber housing and fiber reinforced plastic (FRP) core rod. The composite insulator sample is put in the high frequency magnetic field. Due to the eddy effect, the metal defect will heat. Partial internal heating in the sheath-core interface is achieved in the paper, which is the same as the abnormal overheated composite insulators online. During the experiment, the FPR core rod is heated by the defect, deteriorates, and produces a lot of gas, which cause the damage of the silicone rubber housing. After the experiment, the FPR core rod samples are analyzed by visual observation, scanning electron microscope and Fourier Transform Infrared Spectrometer. It is proved that epoxy resin matrix in the hot environment will be decomposed in the paper.
{"title":"A Method for Simulating Abnormal Heating Internal Interface of Composite Insulator Based on Electromagnetic Heating","authors":"Z. Li, Chao Gao, Ming Lu, H. Mei, Yansong Wu, Liming Wang","doi":"10.1109/ICEMPE51623.2021.9509048","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509048","url":null,"abstract":"Decay-like fracture is a new kind of fracture phenomena of composite insulator occurring in recent years. Abnormal temperature rise in 500kV composite insulators high-voltage end is found by the infrared temperature measurement before the decay-like fracture occurs. In order to simulate the overheat conditions and carry out artificial accelerated aging tests, an experimental method based on electromagnetic heating is put forward in the paper. A metal defect is put in the interface between silicone rubber housing and fiber reinforced plastic (FRP) core rod. The composite insulator sample is put in the high frequency magnetic field. Due to the eddy effect, the metal defect will heat. Partial internal heating in the sheath-core interface is achieved in the paper, which is the same as the abnormal overheated composite insulators online. During the experiment, the FPR core rod is heated by the defect, deteriorates, and produces a lot of gas, which cause the damage of the silicone rubber housing. After the experiment, the FPR core rod samples are analyzed by visual observation, scanning electron microscope and Fourier Transform Infrared Spectrometer. It is proved that epoxy resin matrix in the hot environment will be decomposed in the paper.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"38 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82114888","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}
Compared with single-layer insulation, multilayer insulation structures have more forms and features, thus are widely used in the fields of oil-paper insulation, power cables and communication cables. However, there are fewer researches conducted on the space charge characteristics of multi-layer insulation structures, and the analysis of the interface space charge in those structures is not in-depth. This article takes the ‘skin-foam-skin’ insulation structure of the frequency-shift pulse track signal cables as an example, which are commonly used in railway systems. We carried out room-temperature space charge measurement of the three parts of the ‘skin-foam-skin’ insulation including LDPE, FPE, HDPE, and the double-layer structure of FPE/HDPE and FPE/LDPE separately, based on pulse electro-acoustic (PEA) method. Meanwhile, thermal property of PE samples was also tested. The result shows that a large amount of positive charge injection and accumulation occurred in the single-layer HDPE films. And due to the difference in the carrier mobility during the depolarization process, there was obvious positive charge accumulation near the interface of the FPE/LDPE double-layer structure. Besides, a small amount of negative charge is accumulated at the interface of the FPE/HDPE double-layer structure. This result not only provides a reference for the characterization and evaluation of the space charge characteristics of multi-layer insulation materials, but also provides basic data support for the subsequent selection and extraction of aging characteristics of multi-layer insulation.
{"title":"Dynamic Behavior of Space Charge in Double-layer Insulation Structure under High External Electric Field","authors":"Ling Zhang, Yuxuan Xu, Quzong Gesang, Zhichao Qiao, Bo Zhang, Yuanxiang Zhou","doi":"10.1109/ICEMPE51623.2021.9509147","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509147","url":null,"abstract":"Compared with single-layer insulation, multilayer insulation structures have more forms and features, thus are widely used in the fields of oil-paper insulation, power cables and communication cables. However, there are fewer researches conducted on the space charge characteristics of multi-layer insulation structures, and the analysis of the interface space charge in those structures is not in-depth. This article takes the ‘skin-foam-skin’ insulation structure of the frequency-shift pulse track signal cables as an example, which are commonly used in railway systems. We carried out room-temperature space charge measurement of the three parts of the ‘skin-foam-skin’ insulation including LDPE, FPE, HDPE, and the double-layer structure of FPE/HDPE and FPE/LDPE separately, based on pulse electro-acoustic (PEA) method. Meanwhile, thermal property of PE samples was also tested. The result shows that a large amount of positive charge injection and accumulation occurred in the single-layer HDPE films. And due to the difference in the carrier mobility during the depolarization process, there was obvious positive charge accumulation near the interface of the FPE/LDPE double-layer structure. Besides, a small amount of negative charge is accumulated at the interface of the FPE/HDPE double-layer structure. This result not only provides a reference for the characterization and evaluation of the space charge characteristics of multi-layer insulation materials, but also provides basic data support for the subsequent selection and extraction of aging characteristics of multi-layer insulation.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"24 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79424220","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 : 2021-04-11DOI: 10.1109/ICEMPE51623.2021.9508997
Yuxin He, Lijun Yang, Jiajun Li, Li Cheng, D. Ding, R. Liao
Methanol is a unique aging product of transformer oil paper insulation cellulose. Headspace gas chromatography is mainly used for the measurement of methanol in the insulating oil currently, and the testing process is cumbersome, time consuming and not capable for online monitoring. It is of great significance to develop an efficient and accurate method suitable for on-site detection of methanol content in oil. This paper explores a testing method of methanol in the insulating oil by terahertz spectroscopy. By analyzing the fingerprint spectrum of insulating oil with different methanol content at 0.1-2.0 THz, it is found that the characteristic peak-to-peak value around 1.2 THz and 1.7 THz is closely related to the methanol concentration in the insulating oil. Moreover, the collective vibration caused by the association relationship of trace methanol in insulating oil is revealed by molecular simulation, which leads to the appearance of the characteristic peaks. Based on the relationship between the characteristic peak and the methanol concentration in the oil, this paper initially achieved the detection accuracy of 0.15 ppm trace methanol in the new insulating oil. The research results of this paper reveal the association relationship of trace methanol in insulating oil and propose an important new method, which is expected to be applied to online monitoring of methanol and other degradation by-products in the insulating oil of oil-paper insulation system.
{"title":"A New Method for Detecting Trace Methanol in Insulating Oil Based on Terahertz Spectroscopy","authors":"Yuxin He, Lijun Yang, Jiajun Li, Li Cheng, D. Ding, R. Liao","doi":"10.1109/ICEMPE51623.2021.9508997","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9508997","url":null,"abstract":"Methanol is a unique aging product of transformer oil paper insulation cellulose. Headspace gas chromatography is mainly used for the measurement of methanol in the insulating oil currently, and the testing process is cumbersome, time consuming and not capable for online monitoring. It is of great significance to develop an efficient and accurate method suitable for on-site detection of methanol content in oil. This paper explores a testing method of methanol in the insulating oil by terahertz spectroscopy. By analyzing the fingerprint spectrum of insulating oil with different methanol content at 0.1-2.0 THz, it is found that the characteristic peak-to-peak value around 1.2 THz and 1.7 THz is closely related to the methanol concentration in the insulating oil. Moreover, the collective vibration caused by the association relationship of trace methanol in insulating oil is revealed by molecular simulation, which leads to the appearance of the characteristic peaks. Based on the relationship between the characteristic peak and the methanol concentration in the oil, this paper initially achieved the detection accuracy of 0.15 ppm trace methanol in the new insulating oil. The research results of this paper reveal the association relationship of trace methanol in insulating oil and propose an important new method, which is expected to be applied to online monitoring of methanol and other degradation by-products in the insulating oil of oil-paper insulation system.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"12 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83070715","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}
In order to grasp the corrosion failure characteristics of silicone rubber in an acidic environment, an artificial mist box was used to artificially simulate the corrosion conditions acting on the silicone rubber, and the changes in its surface characteristics were analyzed. The research results show that under the combined action of acid mist and electric field, the physical and chemical properties of composite insulators have declined. There are holes and cracks on the surface, and the hardness increases with the corrosion time. Before flashover, if there is no obvious discharge in the withstand voltage process, the contact angle, relative dielectric constant and absorption peak area change little with the increase of corrosion time. The analysis shows that the damage rate of large-area corrosion of silicone rubber is very slow. Acidic substances will cause the main chain and side chains of the silicone rubber to break, and the aluminum hydroxide in the silicone rubber also reacts with strong acids, resulting in the destruction of the structure of the silicone rubber. The physical and chemical properties are reduced.
{"title":"Study on Corrosion Failure Characteristics of Silicone Rubber in Acidic Environment","authors":"Xiaodan Ma, Zhijin Zhang, Xiaohong Ma, Huan Huang, Xingliang Jiang","doi":"10.1109/ICEMPE51623.2021.9509191","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509191","url":null,"abstract":"In order to grasp the corrosion failure characteristics of silicone rubber in an acidic environment, an artificial mist box was used to artificially simulate the corrosion conditions acting on the silicone rubber, and the changes in its surface characteristics were analyzed. The research results show that under the combined action of acid mist and electric field, the physical and chemical properties of composite insulators have declined. There are holes and cracks on the surface, and the hardness increases with the corrosion time. Before flashover, if there is no obvious discharge in the withstand voltage process, the contact angle, relative dielectric constant and absorption peak area change little with the increase of corrosion time. The analysis shows that the damage rate of large-area corrosion of silicone rubber is very slow. Acidic substances will cause the main chain and side chains of the silicone rubber to break, and the aluminum hydroxide in the silicone rubber also reacts with strong acids, resulting in the destruction of the structure of the silicone rubber. The physical and chemical properties are reduced.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"2005 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82550076","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 : 2021-04-11DOI: 10.1109/ICEMPE51623.2021.9508995
N. Ding, Chengjun Wang, H. Mu, J. Zhan, H. Yao, Lingfeng Jin, P. Qian, Chen Li, Guanjun Zhang
Traditional methods cannot detect hot spot temperature, mechanical vibration and partial discharge signal and other state parameters of the transformer in real time. Optical fiber sensing technology has a wide range of application prospects due to its high accuracy, strong anti-interference ability and distributed measurement. However, the premise for its application is that the embedded optical fiber does not affect the safe operation of the transformer. This paper explores the interact between embedded fibers and transformers. In this paper, four different types of optical fibers were initially selected to prepare fiber-oil composite insulation. Samples under different aging time were obtained through accelerated thermal aging experiments. The mechanical strength and optical loss characteristics of fibers with different aging degrees were tested separately. At the same time, moisture content, acid value, oil chromatogram, dielectric loss factor and volume resistivity of insulating oil were tested. The results show that the mechanical strength of the PVC tight fiber decreases significantly as the aging time increases. PVC tight fiber significantly improves the dielectric loss factor, CO2/CO and total hydrocarbon content in insulating oil. The mechanical properties of the other three optical fibers remain basically unchanged and have little effect on the insulating oil. Thermal stress does not affect the optical transmission characteristics of all optical fibers. The PVC tight fiber is not suitable as the embedded optical fiber in transformers, while the other three optical fibers meet the basic requirements of the embedded optical fiber. The experimental results provide solutions for the safety risk assessment of the embedded optical fiber in transformers.
{"title":"The Insulation Characteristics of Optical Fiber in Transformer Oil Under Long-term Thermal Aging","authors":"N. Ding, Chengjun Wang, H. Mu, J. Zhan, H. Yao, Lingfeng Jin, P. Qian, Chen Li, Guanjun Zhang","doi":"10.1109/ICEMPE51623.2021.9508995","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9508995","url":null,"abstract":"Traditional methods cannot detect hot spot temperature, mechanical vibration and partial discharge signal and other state parameters of the transformer in real time. Optical fiber sensing technology has a wide range of application prospects due to its high accuracy, strong anti-interference ability and distributed measurement. However, the premise for its application is that the embedded optical fiber does not affect the safe operation of the transformer. This paper explores the interact between embedded fibers and transformers. In this paper, four different types of optical fibers were initially selected to prepare fiber-oil composite insulation. Samples under different aging time were obtained through accelerated thermal aging experiments. The mechanical strength and optical loss characteristics of fibers with different aging degrees were tested separately. At the same time, moisture content, acid value, oil chromatogram, dielectric loss factor and volume resistivity of insulating oil were tested. The results show that the mechanical strength of the PVC tight fiber decreases significantly as the aging time increases. PVC tight fiber significantly improves the dielectric loss factor, CO2/CO and total hydrocarbon content in insulating oil. The mechanical properties of the other three optical fibers remain basically unchanged and have little effect on the insulating oil. Thermal stress does not affect the optical transmission characteristics of all optical fibers. The PVC tight fiber is not suitable as the embedded optical fiber in transformers, while the other three optical fibers meet the basic requirements of the embedded optical fiber. The experimental results provide solutions for the safety risk assessment of the embedded optical fiber in transformers.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"1 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82971468","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}
Silicone rubbers containing dynamic hindered urea bonds is a potential material for mechanical damages in power equipment. In this work, poly(silicone-urea)s based on isocyanate-piperazine fabricated dynamic hindered urea bonds was synthesized. Insulating performances of materials with different crosslinking density adjusted by the ratio of polydimethylsiloxane and glycerol were also investigated. It was found that higher crosslinking density could improve dielectric properties remarkably. Moreover, the insulating properties can be recovered through healing mechanical scratches due to the dissociative-associative effect of chemical bonds under mild conditions. The permittivity, dielectric loss, and DC volume resistivity of the polymers have not changed significantly after cut-healing. This proves that constructing a reversible chemical bond is a workable method to prepare self-healing insulating materials.
{"title":"Heat-triggered Self-healing Cross-linked Poly(silicone-urea)s with Recoverable Dielectric Performances","authors":"Wenjie Sun, Lei Zhang, Jiaming Luo, Jiale Mao, Yuanlong Xie, Yonghong Cheng","doi":"10.1109/ICEMPE51623.2021.9509238","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509238","url":null,"abstract":"Silicone rubbers containing dynamic hindered urea bonds is a potential material for mechanical damages in power equipment. In this work, poly(silicone-urea)s based on isocyanate-piperazine fabricated dynamic hindered urea bonds was synthesized. Insulating performances of materials with different crosslinking density adjusted by the ratio of polydimethylsiloxane and glycerol were also investigated. It was found that higher crosslinking density could improve dielectric properties remarkably. Moreover, the insulating properties can be recovered through healing mechanical scratches due to the dissociative-associative effect of chemical bonds under mild conditions. The permittivity, dielectric loss, and DC volume resistivity of the polymers have not changed significantly after cut-healing. This proves that constructing a reversible chemical bond is a workable method to prepare self-healing insulating materials.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"17 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78818555","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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