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Characteristics of Ground Wire Currents along Transmission Line under Lightning Strikes
2023 12th Asia-Pacific International Conference on Lightning (APL)
Year: 2023 | Conference Paper |
Cited by: Papers (1)
Harvesting power from ground wires is an emergent method to solve the power supply issues of online monitoring units in the overhead transmission lines. However, the power harvesting device based on ground wire has a much higher probability to be exposed to lightning overvoltage or overcurrent. Therefore, this paper studies ground wire impulse current characteristics under various lightning strike...Show More
Simulation Study of Capacitor Voltage Transformer based on Overvoltage Measurement Technology
Feng Zhang;Wei Shen;Wen Cao;Yasen Wu;Dezhi Xu;Shenjian Huang;Yang Wang
2022 9th International Conference on Condition Monitoring and Diagnosis (CMD)
Year: 2022 | Conference Paper |
Cited by: Papers (1)
The direct measurement of overvoltage at the secondary side of capacitor voltage transformer (CVT) at high frequency is vulnerable to the interference of electromagnetic unit, so it is impossible to obtain accurate overvoltage wave. The 110kV CVT is modified by placing the voltage sensor in series with the capacitor divider unit. Firstly, the modified CVT model is established by Matlab Simulink to...Show More
Research on Measures of Grounding Resistance Reduction for Substation Based on CDEGS
Sigeng Chen;Wei Shen;Wen Cao;Haoming Miao;Siqi Du;Yicheng Fan
2022 9th International Conference on Condition Monitoring and Diagnosis (CMD)
Year: 2022 | Conference Paper |
Cited by: Papers (1)
With the continuous development of China's power industry and the increasing capacity of the power system, there are more and more safety problems in the operation of the substation grounding grid. The grounding resistance is an essential factor affecting the safety of the grounding grid. The existing resistance reduction measures are designed by traditional methods, which are challenging to meet ...Show More
Study on Unstable Temperature Rise of Slightly Heating Composite Insulator Based on Infrared Detection
Zhentao Li;Wei Shen;Wen Cao;Shenjian Huang;Yicheng Fan;Hao Yang
2022 9th International Conference on Condition Monitoring and Diagnosis (CMD)
Year: 2022 | Conference Paper |
In this paper, the phenomenon of unstable temperature rise (UTR) in infrared detection of composite insulators is investigated. Firstly, according to the infrared detection data, the influences of environmental humidity and commissioning year on the temperature rise (TR) of composite insulators are analyzed. Secondly, four pieces of composite insulators with abnormal heating on the same line are s...Show More
Study on the Partial Discharge Characteristics of Internal Void Defects under Special-shaped Wave Voltage
2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
Year: 2022 | Conference Paper |
During the production, manufacture and transportation of cross-linked polyethylene (XLPE) cable, internal void defects may generate inside the insulation, which will cause partial discharge (PD) affecting the safe and stable operation of XLPE cable. Special-shaped wave voltage has some superiorities in PD detection. The PD characteristics of XLPE insulation samples with internal void defects are i...Show More
Test Method for Lightning Response of Real Transmission Lines
2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)
Year: 2022 | Conference Paper |
Cited by: Papers (2)
Field test is an important way to study the lightning response of transmission lines. When conducting lightning impulse tests on real transmission lines, the arrangement of the test circuit has a significant impact on the test results. In order to obtain reasonable test results, this paper studies the influence of the angle between the test circuit and the tested transmission line and the position...Show More
Effects on Thermal Aging and UV-A Aging on Dielectric Performance of High Temperature Vulcanized Silicone Rubber
Mengqi Wang;JiaChen Yu;Jiacai Li;Hao Liu;Wei Shen;Shengtao Li
2021 6th International Conference on Power and Renewable Energy (ICPRE)
Year: 2021 | Conference Paper |
Cited by: Papers (3)
High temperature vulcanized silicone rubber (HTV-SIR) was aged at 200 °C and under UV-A radiation. The dielectric parameters increased more after thermal aging than that after UV-A aging in 0.4-1.8 THz. Results of Fourier transform infrared spectroscopy showed that the side chains of HTV-SIR cracked after thermal aging. The content of Si-O increased slightly, indicating the cross-linking degree in...Show More
Research on Detection Method of PD Detection with Special-shaped Wave
2020 IEEE 3rd International Conference on Dielectrics (ICD)
Year: 2020 | Conference Paper |
PD detection technology is an important method to judge the insulation performance of equipment. In this paper, four special-shaped waves are designed to detect PD signals in a laboratory environment. Arbitrary signal generator, high-voltage power amplifier, high-frequency voltage divider, protective impedance, coupling capacitor, Rogowski coil, data acquisition card and PC are used to build a spe...Show More
The Breakdown Characteristics of Oil-Paper Insulation in Converter Transformers
Kun Zuo;Wei Shen;Huize Cui;Guangming Zhou;Weiwang Wang;Shengtao Li
2020 International Symposium on Electrical Insulating Materials (ISEIM)
Year: 2020 | Conference Paper |
Cited by: Papers (1)
Oil-paper insulation is the most widely used insulation material in converter transformers, and its safe and reliable operation is one of the important factors to ensure the normal operation of converter transformers. In the long-term working process, the formation and accumulation of space charge in the oil-paper insulation will affect the oil-paper interfacial characteristics and the internal el...Show More
Study on Transient Ground Potential Rise under Transient Interference in GIS Yard
2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)
Year: 2020 | Conference Paper |
With the development of power system towards UHV and intelligence, more and more secondary equipment is applied near gas insulated switchgear (GIS). When GIS switches are operated, transient disturbance will affect the secondary system through the grounding grid, resulting in the misoperation or even damage of the secondary equipment. In this paper, the characteristics of influence of transient cu...Show More
Comparison of Surge Impedance Model and Electromagnetic Field Model of Transmission Tower
Zhizhong Li;Wenbing Xie;Wei Shen;Chaoying Fang;Wei Li;Sen Wang
2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)
Year: 2020 | Conference Paper |
Since the tower surge impedance model plays a very important role in the lightning protection calculation of transmission lines, scholars at home and abroad have given a large number of tower surge impedance models, but the differences are very large. In this paper, the electromagnetic field model of a typical tower is established. Through electromagnetic field calculation, the tower surge impedan...Show More
Study on the ablative resistance properties of epoxy composites with nano/micro fillers for vacuum insulators
Ablation characteristics is a key factor in the surface flashover of insulation materials for vacuum insulators. The influence of nano/micro Al2O3 and Al(OH)3 fillers on the ablative resistance of epoxy vacuum insulation material has been investigated by repeated flashovers in vacuum under microsecond pulses. It was found that the ablative resistance of Al(OH)3 filler is much better than that of A...Show More
Investigation of Surface Discharge on PE in Air and Nitrogen under Different Pressures Based on Pockel Effect
2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
Year: 2019 | Conference Paper |
The influence of surface charge distribution on the development of surface discharge has gained great attention. In this paper, by applying two cycles of AC voltage on the needle plate electrode, the surface charge distribution under different gas pressures are obtained based on the surface charge measurement system. We found that with decreasing of the pressure, the length and radius of surface c...Show More
Study on the Law of Water Drop Movement on the Surface of Insulators under AC and DC Electric Field
Wen Cao;Hao Xue;Yan Du;Hao Yang;Long Zhao;Xiaoxue Guo;Yang Wang;Wei Shen;Zengpeng Lv;Wen Cao
2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
Year: 2019 | Conference Paper |
Cited by: Papers (4)
The motion and deformation of water droplets on the surface of silicone rubber insulator will distort the distribution of electric field and even cause flashover along the surface. This paper studies the droplets movement on insulator surface under AC and DC field in wet environment. In this paper, the electrical and hydrodynamic problems involved in multi-physical field coupling are modeled and a...Show More
Study on Transient Impact Characteristics of Grounding Grid in UHV Converter Station and Its Influencing Factors
Zhaohua Zhang;Weidong Shi;Peng Kang;Yankun Wu;Bo Zhang;Wei Shen;Gang Zhou
2018 International Conference on Power System Technology (POWERCON)
Year: 2018 | Conference Paper |
When the converter station is suffered by lightning strike, short circuit fault or switch operation, the grounding grid of the converter station may be impacted by high frequency and large current, which makes the grounding grid of the converter station presents a complex impact characteristic, namely, a phenomenon of uneven distribution of transient grounding potential, which may cause the interf...Show More
Overvoltage of secondary cables in substation due to short circuit fault
2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia-Pacific Symposium on Electromagnetic Compatibility (EMC/APEMC)
Year: 2018 | Conference Paper |
Cited by: Papers (7)
Secondary devices are important components of a substation. The overvoltage due to the short circuit fault may interfere and do harm to the secondary devices. Based on the short circuit test of a ±500 kV converter station, the overvoltage of secondary cables in the substation was measured. The ground potential distribution of the grounding grid was calculated. Results show that the ground potentia...Show More
Study on the feasibility of monitoring electric field distribution along the string to detect degradation of insulator core rod
Wen Cao;Huancheng Ma;Yunjuan Zhang;Zhizhan Kong;Xiuyu Xie;Wei Shen;Yi Tian
2016 International Conference on Condition Monitoring and Diagnosis (CMD)
Year: 2016 | Conference Paper |
In this paper, FEM calculation software of COMSOL Multiphysics is used to analysis the properties of electric field distribution along the insulator string when there is simulated carbonized channel existing between sheath and core rod. The results show that the carbonized channelsdo make the space electric field distorted, the closer channel is to high voltage side, the more distortion is; the in...Show More
An approach for economic assessment on oil-paper insulation diagnosis through accelerated aging experiments
Wen Cao;Baosheng He;Wei Shen;Xuetao Shi;Kai Wu;Tatsuki Okamoto;Yasuo Suzuoki
In this paper the accelerated aging experiments of oil-paper insulation are carried out to simulate the oil-paper aging process under normal thermal aging process. On the basis of the results of accelerated aging experiments, how the deviation degree of aging status change under the same aging factors is studied, and a method to calculate the failure probability due to the loss of mechanical stren...Show More
Structural design for dc bushing core based on the material life
In this paper, the design method of dc capacitor bushing core has been studied. According to the derived epoxy/paper composite life model, the bushing core design methods are proposed based on the life of materials, which can make a more reasonable electric field distribution within bushing core. By adjusting the size of plates, the insulation life of innermost and outermost of the bushing core is...Show More
The investigation on dispersion of characteristic parameters for assessment of insulating state and economic feasibility in oil-paper insulation diagnosis
2012 IEEE International Conference on Condition Monitoring and Diagnosis
Year: 2012 | Conference Paper |
The former researches for condition assessment of oil-paper focus on the statistical results of aging factors and diagnostic data, the mechanisms of aging factors and variation law of each characteristics, which can give conclusions of aging status and furthermore, life expectations. However, the questions “How exactly can aging characteristics reflect the aging status”, “To what extent can we bel...Show More
The study on ablation resistance of epoxy resin based composite in vacuum
2010 10th IEEE International Conference on Solid Dielectrics
Year: 2010 | Conference Paper |
Cited by: Papers (1)
This paper mainly studies the influence of nano/micro Al2O3 and Al(OH)3 in epoxy composites on the ablation resistance, by quantifying the mass loss and observing the surface topography of sample after several times surface flashover in vacuum (the peak value is approximately 10kA, and the wave front is 8us, wave tail is 20us(8/20us)). The experimental results show that the addition of inorganic f...Show More
The reliability of multi-parameter insulation diagnosis
Kai Wu;Wei Shen;Yongpeng Meng;Wen Cao;Cheng Pan;Yonghong Cheng;Xiaohong Zhang
On the basis of statistical theory, a method to determine quantitatively the reliability of multi-parameter diagnosis and to optimize the algorithm of multi-parameter diagnosis is put forward. Moreover, as an example, this method is applied to the estimation of residual breakdown voltage of generator bars and the optimized multi-parameter diagnosis algorithm is determined on the basis of actual da...Show More
The optimization of multi-parameter insulation diagnosis
Kai Wu;Wei Shen;YongPeng Meng;Wen Cao;Cheng Pan;Yonghong Cheng;And Xiaohong Zhang
2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena
Year: 2009 | Conference Paper |
On the basis of statistical theory, a method to quantitatively determine the reliability of multi-parameter diagnosis and to optimize the algorithm of multi-parameter diagnosis is put forward. This method is based on the statistical law, and concerns correlation between the different parameters. Moreover, as an example, the stator bar of generator (300 MW, 18 kV) is studied. 30 samples were select...Show More
Investigation on economic feasibility of different maintenance rules for cable
Kai Wu;Wen Cao;Wei Shen;Minggang Gao;Tingdong Fan;Junyi Zhou;Wenxing Zhang;Guoqiang Huang
2009 IEEE 9th International Conference on the Properties and Applications of Dielectric Materials
Year: 2009 | Conference Paper |
Cited by: Papers (1)
Life-cycle cost (LCC) assessment are carried out to compare the economic feasibility of different maintenance rules, such as periodical replacement (TBM), periodical diagnosis (PDM), dual-periodical diagnosis (DDM) and the strategy of periodical replacement with one occasional diagnosis at the optimal opportunity (DTB). The maintenance rule of DDM may generally save a lot of total cost than that o...Show More
Investigation of Economic Feasibility of Different Rules of Insulation Diagnosis
On the basis of life-cycle cost assessment of periodical diagnosis, a modified calculation method is put forward to evaluate the economic feasibility of the diagnosis rule with an attention value of the measurement parameter above which the apparatus should be diagnosed more frequently. The calculation results show that this diagnosis rule is of more economic merit than the one with a simple diagn...Show More
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