This paper presents an approach for calibration of ultra-high-frequency (UHF) partial discharge (PD) signals in high voltage direct current (HVDC) transformer. A linear relationship between the amplitude of the UHF PD signal and PD apparent charge was obtained through the theoretical analysis. The finite-difference time-domain (FDTD) model of the simulated converter transformer showed that the UHF PD electromagnetic waves in converter transformer can propagate outside by the transformer bushing. The UHF PD signals propagated from the transformer bushing were obtained by the FDTD calculation. The simulation results showed that the amplitudes of the UHF PD signals were related to the transformer bushing and the detection position. Artificial cavity insulation model were designed to generate UHF PD signals, which were detected by a Peano fractal antenna in a series of experiments. The experimental results show that the antenna can detect the UHF PD signals inside of the transformer from the bushing and the PD apparent charge can be calibrated by the proposed approximate equations.
{"title":"Calibration model of ultra-high-frequency partial discharge signals in HVDC converter transformers","authors":"Xiaolin Li, Peng Wang, Jinzhuang Lv, Zhiman He, Linjie Zhao, Jian Li","doi":"10.1109/ICHVE.2012.6357148","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357148","url":null,"abstract":"This paper presents an approach for calibration of ultra-high-frequency (UHF) partial discharge (PD) signals in high voltage direct current (HVDC) transformer. A linear relationship between the amplitude of the UHF PD signal and PD apparent charge was obtained through the theoretical analysis. The finite-difference time-domain (FDTD) model of the simulated converter transformer showed that the UHF PD electromagnetic waves in converter transformer can propagate outside by the transformer bushing. The UHF PD signals propagated from the transformer bushing were obtained by the FDTD calculation. The simulation results showed that the amplitudes of the UHF PD signals were related to the transformer bushing and the detection position. Artificial cavity insulation model were designed to generate UHF PD signals, which were detected by a Peano fractal antenna in a series of experiments. The experimental results show that the antenna can detect the UHF PD signals inside of the transformer from the bushing and the PD apparent charge can be calibrated by the proposed approximate equations.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"125 1","pages":"363-367"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86421849","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357052
A. Cichon, S. Borucki
Results of scientific research works considering selection of measuring transducer applied for registration of acoustic emission (AE) signals generated by on load tap changers (OLTC) are presented in the paper. During the coupling process AE signals are generated by: the mechanical setup of tap changer, contacts operation and partial discharges. For most OLTC types, the working medium is insulation oil in which the acoustic wave being formed propagates to the steal tank. There exists a possibility to register AE signals with a piezoelectric transducer attached to the outer tank surface or with a hydrophone immersed in the oil. AE signal obtained in such manner contains information which describes operation of the power tap changer and the selector. A comparative analysis of AE signals generated by OLTC working under laboratory conditions in three setups, each applying measuring transducers with different transmittance, is presented in the paper. In measurements three types of transducers were applied: wide band transducer type WD AH-17 from Physical Acoustics Corporation, hydrophone type TC4038 from Reson and accelerometer type 4514 - B - 001 from Brüel & Kjær. The comparative analysis was performed in order to determine their suitability for OLTC technical condition diagnosis. Based on the results achieved one transducer which allows the registration of acoustic events generated by the mechanical setup as well as by electric phenomena occurring during OLTC operation was selected.
本文介绍了用于有载分接开关声发射信号配准测量换能器选型的科研工作结果。在耦合过程中，声发射信号由分接开关的机械设置、触点操作和局部放电产生。对于大多数OLTC类型，工作介质是绝缘油，其中形成的声波传播到储槽。有一种可能是用附着在油箱外表面的压电换能器或浸入油中的水听器来记录声发射信号。以这种方式获得的声发射信号包含描述电源分接开关和选择器操作的信息。本文对OLTC在实验室条件下使用不同透射率测量传感器的三种装置所产生的声发射信号进行了对比分析。在测量中使用了三种类型的换能器:物理声学公司的WD AH-17型宽带换能器，瑞森公司的TC4038型水听器和br el & k ær公司的4514 - B - 001型加速度计。通过比较分析，确定其在OLTC技术状态诊断中的适用性。根据所取得的结果，选择了一种可以记录由机械装置产生的声事件以及在OLTC操作期间发生的电现象的换能器。
{"title":"Diagnostics of technical condition on load tap changers by acoustic emission method using different types of measuring transducers","authors":"A. Cichon, S. Borucki","doi":"10.1109/ICHVE.2012.6357052","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357052","url":null,"abstract":"Results of scientific research works considering selection of measuring transducer applied for registration of acoustic emission (AE) signals generated by on load tap changers (OLTC) are presented in the paper. During the coupling process AE signals are generated by: the mechanical setup of tap changer, contacts operation and partial discharges. For most OLTC types, the working medium is insulation oil in which the acoustic wave being formed propagates to the steal tank. There exists a possibility to register AE signals with a piezoelectric transducer attached to the outer tank surface or with a hydrophone immersed in the oil. AE signal obtained in such manner contains information which describes operation of the power tap changer and the selector. A comparative analysis of AE signals generated by OLTC working under laboratory conditions in three setups, each applying measuring transducers with different transmittance, is presented in the paper. In measurements three types of transducers were applied: wide band transducer type WD AH-17 from Physical Acoustics Corporation, hydrophone type TC4038 from Reson and accelerometer type 4514 - B - 001 from Brüel & Kjær. The comparative analysis was performed in order to determine their suitability for OLTC technical condition diagnosis. Based on the results achieved one transducer which allows the registration of acoustic events generated by the mechanical setup as well as by electric phenomena occurring during OLTC operation was selected.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"50 1","pages":"621-624"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89150177","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357008
Bo Niu, Sen Wang, Xiuyu Xie, L. Pu, Zhizhong Li, Chuanming Zhou
Operation of Disconnecting Switch (DS) and Circuit Breaker (CB) can produce very fast transient overvoltage (VFTO) in GIS. During the transmission process of VFTO in GIS, as the backflow route of VFTO, corresponding high frequency interference can be induced on the shell of GIS. High-frequency interference's entering into grounding network can cause transient ground potential rise (TGPR), resulting in resistance interference. The paper focuses on the transmission characteristics of high frequency interference caused by VFTO, and analyzes factors affecting interference voltage transmission through changing grounding network parameters. For the typical grounding network structure and actual grounding network model in a substation, transmission factors affecting interference voltage in the grounding network are analyzed through changing grounding network parameters to discuss the interference caused by DS operation on GIS substation via resistance coupling mode.
{"title":"Study on resistive coupling interference of Operation of Disconnecting Switch in GIS substation","authors":"Bo Niu, Sen Wang, Xiuyu Xie, L. Pu, Zhizhong Li, Chuanming Zhou","doi":"10.1109/ICHVE.2012.6357008","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357008","url":null,"abstract":"Operation of Disconnecting Switch (DS) and Circuit Breaker (CB) can produce very fast transient overvoltage (VFTO) in GIS. During the transmission process of VFTO in GIS, as the backflow route of VFTO, corresponding high frequency interference can be induced on the shell of GIS. High-frequency interference's entering into grounding network can cause transient ground potential rise (TGPR), resulting in resistance interference. The paper focuses on the transmission characteristics of high frequency interference caused by VFTO, and analyzes factors affecting interference voltage transmission through changing grounding network parameters. For the typical grounding network structure and actual grounding network model in a substation, transmission factors affecting interference voltage in the grounding network are analyzed through changing grounding network parameters to discuss the interference caused by DS operation on GIS substation via resistance coupling mode.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"80 1","pages":"76-80"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89000253","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357152
H. Rao, Licheng Li, Ruihai Li, Guoli Wang, Y. Liao, Fuzeng Zhang
High altitudes and heavy pollution are special technical problems faced by UHV DC transmission line in China. Much research work of external insulation performance for ±800 kV DC Transmission Lines were carried out at National Engineering Laboratory for Ultra High Voltage (UHV) Engineering Technology (Kunming). For composite insulators, the shed design parameters have great influence on the flashover voltages. It was found that, with the same insulation distance, the flashover voltage had optimized values at a particular value of the radial extent of the shed and of the between-repeat distance. And the suspension patterns also play an important role in the flashover performance for composite insulators. The flashover voltage of the full scale post insulator decreased with the increasing of the SDD. The switching impulse strength of air gap clearance at a full scale conductor-to-tower model of Yunnan-Guangdong ± 800 kV UHVDC project is also studied.
{"title":"Study on the external insulation performance of ±800 kV DC transmission lines at high altitudes","authors":"H. Rao, Licheng Li, Ruihai Li, Guoli Wang, Y. Liao, Fuzeng Zhang","doi":"10.1109/ICHVE.2012.6357152","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357152","url":null,"abstract":"High altitudes and heavy pollution are special technical problems faced by UHV DC transmission line in China. Much research work of external insulation performance for ±800 kV DC Transmission Lines were carried out at National Engineering Laboratory for Ultra High Voltage (UHV) Engineering Technology (Kunming). For composite insulators, the shed design parameters have great influence on the flashover voltages. It was found that, with the same insulation distance, the flashover voltage had optimized values at a particular value of the radial extent of the shed and of the between-repeat distance. And the suspension patterns also play an important role in the flashover performance for composite insulators. The flashover voltage of the full scale post insulator decreased with the increasing of the SDD. The switching impulse strength of air gap clearance at a full scale conductor-to-tower model of Yunnan-Guangdong ± 800 kV UHVDC project is also studied.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"40 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85104536","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357003
Xiaoli Shen, Feng Wang, R. Zeng, Y. Geng
The electric field is crucial to the research on the characteristics of long air gap discharge, which is of great importance to the development of ultra high voltage (UHV) projects. The measuring of electric field is one of the hot spots and makes great sense while doing the research. In this paper, an electric field measurement system based on the integrated electro-optical technology was proposed and calibrated between parallel plane electrodes, by which the input-output characteristic and measurement range of the system were obtained. Using this measurement system, the axial electric field was measured in 1m rod(different radii of curvature)-plane gap energized by positive lightning impulse voltage. Furthermore, the Laplace fields on the measuring points were calculated by charge simulation method (CSM). Comparing the measurement and calculation results, it was found that they agree very well and the maximum error is less than 5%. It is proved that this electric field measurement system is feasible for quantitative measurement of electric field of long air gap discharge.
{"title":"Lightning impulse electric field measurement in long air gap based on the integrated electro-optical measurement system","authors":"Xiaoli Shen, Feng Wang, R. Zeng, Y. Geng","doi":"10.1109/ICHVE.2012.6357003","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357003","url":null,"abstract":"The electric field is crucial to the research on the characteristics of long air gap discharge, which is of great importance to the development of ultra high voltage (UHV) projects. The measuring of electric field is one of the hot spots and makes great sense while doing the research. In this paper, an electric field measurement system based on the integrated electro-optical technology was proposed and calibrated between parallel plane electrodes, by which the input-output characteristic and measurement range of the system were obtained. Using this measurement system, the axial electric field was measured in 1m rod(different radii of curvature)-plane gap energized by positive lightning impulse voltage. Furthermore, the Laplace fields on the measuring points were calculated by charge simulation method (CSM). Comparing the measurement and calculation results, it was found that they agree very well and the maximum error is less than 5%. It is proved that this electric field measurement system is feasible for quantitative measurement of electric field of long air gap discharge.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"67 1","pages":"30-34"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84074031","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}
Partial discharge (PD) will do harm to electrical equipment, and consequently equipment insulation will age, degrade, and which is the sign of the degradation of the integrity of the equipment insulation. The degradation of insulation seriously affects the reliability of the equipment, and even affects the reliable operation of the entire grid. Study of PD detection and diagnosis for Electrical equipment is of very important scientific significance and practical value. Ultra high frequency method (UHF), with a strong anti-interference of the noise, is an excellent method of PD detection, and the energy characteristics of the signal analysis, eliminating the need for a high-speed digital card, simplifies complexity of design and saves cost to ensure reliability. Therefore, the paper is based on the UHF detection and extraction of the characteristics of PD energy method, using ADS computer-aided software to design a microwave filter which can divide the frequency of the PD signal, building the foundation for the next step to extract the energy characteristics of the various bands of the signal.
{"title":"The design and simulation of frequency division filter for switchgear partial discharge detection","authors":"Peng Tian, Xing-xiang He, Zhao Liu, Fei He, Yunchuan Feng, Y. Mi, Yu Chen","doi":"10.1109/ICHVE.2012.6357149","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357149","url":null,"abstract":"Partial discharge (PD) will do harm to electrical equipment, and consequently equipment insulation will age, degrade, and which is the sign of the degradation of the integrity of the equipment insulation. The degradation of insulation seriously affects the reliability of the equipment, and even affects the reliable operation of the entire grid. Study of PD detection and diagnosis for Electrical equipment is of very important scientific significance and practical value. Ultra high frequency method (UHF), with a strong anti-interference of the noise, is an excellent method of PD detection, and the energy characteristics of the signal analysis, eliminating the need for a high-speed digital card, simplifies complexity of design and saves cost to ensure reliability. Therefore, the paper is based on the UHF detection and extraction of the characteristics of PD energy method, using ADS computer-aided software to design a microwave filter which can divide the frequency of the PD signal, building the foundation for the next step to extract the energy characteristics of the various bands of the signal.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"1 1","pages":"368-371"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84106865","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357041
Feifei Wu, R. Liao, Xinghua Liu, Fan Yang, Lijun Yang, Zhi Zhou, Y. Luo
This paper presents an improved self-consistent, multi-component and two-dimensional plasma hybrid model for the simulation of DC positive corona discharge under atmospheric environment. The model is based on the plasma hydrodynamics and the chemical modles, it includes 12 species and 27 reactions. Besides, the photoionization effect is also considered in the proposed model. Based on this model, the volume of dynamics charged species generation, the discharge current waveform, electron temperature, and electric field variations are investigated in details. The results indicate that the model provides valuable insights to the physics of air corona discharge.
{"title":"Numerical simulation of DC positive corona discharge under atmospheric environment","authors":"Feifei Wu, R. Liao, Xinghua Liu, Fan Yang, Lijun Yang, Zhi Zhou, Y. Luo","doi":"10.1109/ICHVE.2012.6357041","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357041","url":null,"abstract":"This paper presents an improved self-consistent, multi-component and two-dimensional plasma hybrid model for the simulation of DC positive corona discharge under atmospheric environment. The model is based on the plasma hydrodynamics and the chemical modles, it includes 12 species and 27 reactions. Besides, the photoionization effect is also considered in the proposed model. Based on this model, the volume of dynamics charged species generation, the discharge current waveform, electron temperature, and electric field variations are investigated in details. The results indicate that the model provides valuable insights to the physics of air corona discharge.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"35 1","pages":"523-527"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88167845","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357116
Zhiman He, Linjie Zhao, Yuming Zhao, Xiaqing Sun, T. Jiang, Lianwei Bao, Jian Li
One of the major insulations of high voltage direct current (HVDC) converter transformers is oil-paper insulation. Valve-side windings withstand complex stresses combined with AC, DC, and pulse voltages. Partial discharge in oil-paper insulation is a major incipient fault of an HVDC converter transformer inside insulation. There are few studies on the development characteristics of partial discharge in oil-paper insulation and dissolved gases in oils of an HVDC converter transformer. Based on artificial insulation defect models of oil-paper insulation, the present study investigates the variation characteristics of dissolved gases in the discharge development process. Experiment and analysis results show that the characteristics of dissolved gases in oils under AC-DC combined voltages are appreciably different with those under an AC voltage. These results provide theoretical support for further research on partial discharge and on dissolved gases of other internal insulating defects and the fault diagnosis of HVDC converter transformers.
{"title":"Dissolved gases generated of partial discharges and electrical breakdown in oil-paper insulation under AC-DC combined voltages","authors":"Zhiman He, Linjie Zhao, Yuming Zhao, Xiaqing Sun, T. Jiang, Lianwei Bao, Jian Li","doi":"10.1109/ICHVE.2012.6357116","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357116","url":null,"abstract":"One of the major insulations of high voltage direct current (HVDC) converter transformers is oil-paper insulation. Valve-side windings withstand complex stresses combined with AC, DC, and pulse voltages. Partial discharge in oil-paper insulation is a major incipient fault of an HVDC converter transformer inside insulation. There are few studies on the development characteristics of partial discharge in oil-paper insulation and dissolved gases in oils of an HVDC converter transformer. Based on artificial insulation defect models of oil-paper insulation, the present study investigates the variation characteristics of dissolved gases in the discharge development process. Experiment and analysis results show that the characteristics of dissolved gases in oils under AC-DC combined voltages are appreciably different with those under an AC voltage. These results provide theoretical support for further research on partial discharge and on dissolved gases of other internal insulating defects and the fault diagnosis of HVDC converter transformers.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"53 1","pages":"314-317"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86868086","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357123
P. Sun, Jian Li, Yonglong Yan
Increasing wind power generation quantity needs obviously reliable insulation property of power equipment. Since over 70% of the installed turbines utilize wound rotor induction machines (referred to as double-fed induction generators DFIG) , DFIG is deemed to be one of the most critical components of wind power systems and its performance directly influences the stability and reliability of wind power generation. However, insulating early failures occur frequently. Presently, polyimide (PI) film which has been widely applied in turn to turn insulation and turn to ground insulation of DFIG is a kind of basic insulating material. This technical review is carried out with the aim of describing the current state of the art in aging characteristics and mechanism research for polyimide film with a consideration of the complex operation condition and environment where it is in. The aging characteristics of PI film based on different analysis methods are described first. This is followed by a description of lifetime model of PI film for multi stress. It is intended that this review will provide the basis for future developments in study on the aging characteristics and mechanism of PI film.
{"title":"Study on aging characteristics and lifetime model of polyimide film: A review","authors":"P. Sun, Jian Li, Yonglong Yan","doi":"10.1109/ICHVE.2012.6357123","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357123","url":null,"abstract":"Increasing wind power generation quantity needs obviously reliable insulation property of power equipment. Since over 70% of the installed turbines utilize wound rotor induction machines (referred to as double-fed induction generators DFIG) , DFIG is deemed to be one of the most critical components of wind power systems and its performance directly influences the stability and reliability of wind power generation. However, insulating early failures occur frequently. Presently, polyimide (PI) film which has been widely applied in turn to turn insulation and turn to ground insulation of DFIG is a kind of basic insulating material. This technical review is carried out with the aim of describing the current state of the art in aging characteristics and mechanism research for polyimide film with a consideration of the complex operation condition and environment where it is in. The aging characteristics of PI film based on different analysis methods are described first. This is followed by a description of lifetime model of PI film for multi stress. It is intended that this review will provide the basis for future developments in study on the aging characteristics and mechanism of PI film.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"2005 1","pages":"259-264"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89984357","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}
Charge traps have great influence on charge transport, trapping and recombination in solid dielectrics such as polymers. In this paper, the energy distribution of traps in three polymers i.e. low density polyethylene (LDPE), polypropylene (PP) and polyester (PET) has been studied, based on the isothermal surface potential decay measurement. Trap measurement and calculation formula is deduced and a trap non-contact measurement setup is specially designed. One excellence of the device is that electron or hole trap parameters can be determined by choosing negative or positive charging, respectively. On the basis of the formula acquired, the electron and hole trapping parameters of the material can be evaluated. Results reveal that potential of PET decays the fastest among these materials, probably because there is more charge injection into the bulk during corona charging. With the enhancement of temperature, both negative and positive potentials decay faster. The trap density of PET is much higher than LDPE and PP, which reveals the high polarity of the PET molecule.
{"title":"The energy distribution of traps in polymers based on isothermal surface potential decay measurement","authors":"Wen-Wei Shen, Guo-Li Wang, Yushu Niu, Jun-Liang Wang, Li-Miao Zhang, Yiqun Zhang, Guanjun Zhang","doi":"10.1109/ICHVE.2012.6357082","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357082","url":null,"abstract":"Charge traps have great influence on charge transport, trapping and recombination in solid dielectrics such as polymers. In this paper, the energy distribution of traps in three polymers i.e. low density polyethylene (LDPE), polypropylene (PP) and polyester (PET) has been studied, based on the isothermal surface potential decay measurement. Trap measurement and calculation formula is deduced and a trap non-contact measurement setup is specially designed. One excellence of the device is that electron or hole trap parameters can be determined by choosing negative or positive charging, respectively. On the basis of the formula acquired, the electron and hole trapping parameters of the material can be evaluated. Results reveal that potential of PET decays the fastest among these materials, probably because there is more charge injection into the bulk during corona charging. With the enhancement of temperature, both negative and positive potentials decay faster. The trap density of PET is much higher than LDPE and PP, which reveals the high polarity of the PET molecule.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"62 1","pages":"472-475"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90154697","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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