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Enhanced Temperature Stability of Piezoelectricity in Polymeric Blends via Configuration Confinement Effect
Qiang Zhang;Ninghui He;Yan Wang;Chuan Chen;Yongbin Liu;Siyang Chen;Xiu Zhou;Pei Zhang
2024 IEEE 14th International Conference on the Properties and Applications of Dielectric Materials (ICPADM)
Year: 2024 | Conference Paper |
Temperature-stable piezoelectricity of dielectric polymers is demanded for accurate vibration sensing applications, but the thermal activated molecular motion could disrupt the polarization switching of electroactive crystalline regions, which precludes their applications in a wider temperature range. Here a general material design strategy to enhance the temperature stability of piezoelectric res...Show More
Grounding Current Mechanism of Converter Transformer Core and Clamp
Haonan Bai;Dezhi Chen;Guoxin Zhao;Xiu Zhou;Ziyuan Xin;Xiaofeng Zheng
2024 IEEE 21st Biennial Conference on Electromagnetic Field Computation (CEFC)
Year: 2024 | Conference Paper |
This paper analyzes the mechanism of grounding current generation in the core and clamp of converter transformers, which is much higher than that of ordinary power transformers in recent years. Firstly, factors such as the connection type, grounding method, iron core type, voltage level, voltage harmonics, DC bias and age of the converter transformer are taken into consideration for mechanism anal...Show More
Analysis of Abnormal Grounding Current in Converter Transformer Core
2024 IEEE 7th International Electrical and Energy Conference (CIEEC)
Year: 2024 | Conference Paper |
The clamp grounding current of a converter transformer in the northwest region is around 2A for a long time. To accurately analyze the reasons, this article uses 3D simulation software and electromagnetic transient simulation software to analyze the impact of different working conditions on the grounding current of the iron core and clamp. On site testing of the clamp grounding current reveals tha...Show More
Calculation of Lightning Impulse Voltage Distribution of Voltage Transformer
Xin Ma;Naming Zhang;Xiu Zhou;Zhenggang He;Yilun Wang;Shuhong Wang
2024 IEEE 7th International Electrical and Energy Conference (CIEEC)
Year: 2024 | Conference Paper |
A circuit model was employed to estimate the lightning surge voltage distribution within a 245-kV voltage transformer. Model parameters were determined using a combination of analytical formulas and the finite element method. The model was implemented in circuit simulation software, and the voltage distribution in the voltage transformer windings was calculated for a standard $2.5/50\mu \mathrm{s}...Show More
Partial Discharge Decomposition Characteristics of SF6/N2 Gas Mixtures under Insulator Air Gap Defects and Free Metal Particle Defects
Jin Bai;Xiu Zhou;Tian Tian;Lei Chen;Shangpeng Sun;Ao Zhan;Fanchao Ye
2024 9th Asia Conference on Power and Electrical Engineering (ACPEE)
Year: 2024 | Conference Paper |
Cited by: Papers (1)
The use of $\mathrm{SF}_{6} / \mathrm{N}_{2}$ gas mixtures in gas-insulated equipment reduces the greenhouse effect of pure sulfur hexafluoride gas. In this paper, the partial discharge decomposition of $\mathrm{SF}_{6} / \mathrm{N}_{2}$ gas mixtures under insulator air gap defects and free metal particle defects is investigated. The results show that the main decomposition products of $\mathrm{SF...Show More
Dry-type air-core Smoothing Reactor Based on Inter-turn Insulation Thickness Design
Yawei Liu;Xin Yang;Haocong Li;Shuang Lu;Xiu Zhou;Jin Bai;Tian Tian
2023 8th International Conference on Control, Robotics and Cybernetics (CRC)
Year: 2024 | Conference Paper |
The smoothing reactor is a commonly used electrical equipment in the power system, and it is prone to turn-to-turn insulation faults in long-term operation. The inter-turn insulation and solidified insulation have the problem of mutual matching due to different materials. In this paper, the operating state of the smoothing reactor is optimized by controlling the inter-turn insulation thickness of ...Show More
The Temperature Distribution Law of Dry-Type Air-Core Reactor and the Layout Scheme Design of Encapsulated Temperature Sensor
2023 8th International Conference on Control, Robotics and Cybernetics (CRC)
Year: 2024 | Conference Paper |
In order to realize the safe and stable operation of the power grid, it is necessary to monitor the reactor in operation reasonably. In order to put forward the layout scheme of wireless temperature sensor in the on-line temperature monitoring system of dry-type air-core reactor, the finite element temperature simulation calculation is carried out according to the principle of multi-physical field...Show More
Research on High-Frequency Current and Electromagnetic Radiation Characteristics During the Switching Process of Tap Changer
2023 International Conference on Power System Technology (PowerCon)
Year: 2023 | Conference Paper |
Cited by: Papers (1)
During the switching process of vacuum on-load tap changer, high frequency oscillation current is generated in the circuit due to the opening and closing of contacts, and the electromagnetic wave generated can be used to diagnose the status of tap changer. In order to understand the mechanism of high-frequency current and electromagnetic radiation in the process of tap changer switching, the equiv...Show More
Measurement of Implus Surface Flashover Voltage of Epoxy Resin in Liquid Nitrogen
Jin Bai;Xiu Zhou;Tian Tian;Yan Luo;Yunlong Ma;Weifeng Liu;Zecheng Li;Yizhe Jiao;Shuang Lu;Xin Yang
2023 IEEE 5th International Conference on Power, Intelligent Computing and Systems (ICPICS)
Year: 2023 | Conference Paper |
With the development of superconducting power devices, the research of the characteristics of surface flashover of insulation materials in low-temperature environments is getting increasingly important. In this paper, the flashover voltage along the surface of epoxy resin in liquid nitrogen were measured. The first flashover voltage along the surface at different spacings were measured by using ri...Show More
Cause Analysis and Preventive Measures of Abnormal 750 kV Arrester
Xiu Zhou;Jin Bai;Weifeng Liu;Guangyao Qiao;Fangyi Li;Xiujuan Chen;Haibing Fan
2023 8th Asia Conference on Power and Electrical Engineering (ACPEE)
Year: 2023 | Conference Paper |
This paper describes the abnormal heating of the metal oxide arrester at the high voltage side of 750 kV main transformer. Infrared temperature measurement, insulation resistance and capacitance test data were used to preliminarily determine the cause of abnormal heating. It was found that the upper four sections and the lower two sections of the arrester were installed reversely through disassemb...Show More
Prediction Method of Dissolved Gas in Transformer Oil Based on Firefly Algorithm - Random Forest
Xiu Zhou;Tian Tian;Ninghui He;Yunlong Ma;Weifeng Liu;Zhenghua Yan;Yan Luo;Xiuguang Li;Hui Ni
2022 Asia Power and Electrical Technology Conference (APET)
Year: 2022 | Conference Paper |
Dissolved gas in oil is an important parameter to reflect the operation state of the transformer. By analyzing the volume fraction of different fault characteristic gases, it can effectively judge the fault condition and fault type of transformer, while predicting the content of dissolved gas in transformer oil can make timely warning before further deterioration of the fault to avoid the occurren...Show More
Fault Diagnosis Method of Oil-Immersed Transformer Based on the Production Pattern of Free Gas and Dissolved Gas in Oil
Xiu Zhou;Tian Tian;Ningbo Liu;Jin Bai;Yan Luo;Ninghui He;Pengcheng Zhang;Jun Sun
2022 Asia Power and Electrical Technology Conference (APET)
Year: 2022 | Conference Paper |
Monitoring the operating state of oil immersed transformer by free gas is an effective means to prevent equipment from burning and explosion. However, there is no research on the production pattern of free gas under different fault conditions. In this paper, the production pattern of free gas under discharge fault and thermal fault is obtained through experiments, and the dissolved gas in oil is c...Show More
Fault analysis of 750kV high voltage reactor based on multiple physical fields
Xiu Zhou;Jin Bai;Zhonghua Xiang;Tian Tian;Kui Ma;Yan Luo;Xiuguang Li;Yang Wu;Heng Zhang
2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)
Year: 2022 | Conference Paper |
The parallel oil immersed reactor of 750 kV ultra-high voltage can improve the reactive power operation state of the 750 kV line. When the 750 kV line is lightly empty or lightly loaded, the line has capacitance effect, which can be used to reduce the power frequency transient overvoltage and improve the voltage distribution. This is the reason why the high voltage reactor of Hehu II line in Helan...Show More
Grounding Safety Design Method of Urban Transmission Steel Tube Tower
2022 China International Conference on Electricity Distribution (CICED)
Year: 2022 | Conference Paper |
The grounding designs of urban transmission steel pipe towers in densely populated areas rarely considers the step voltage and contact voltage indexes, which has potential safety hazard. This paper calculates the maximum allowable value of each safety index of tower grounding device under the condition of power frequency short circuit and lightning strike, and calculates the actual value of safety...Show More
The method of improving the lightning resistance level of 10kV multi-circuit overhead line with parallel gap
2022 China International Conference on Electricity Distribution (CICED)
Year: 2022 | Conference Paper |
The method of single phase same line installation of parallel gaps on a can effectively improve the lightning resistance level of 10kV overhead distribution lines. However, current related research methods only involve the effect on the lightning withstands level of 10kV single-circuit overhead lines. There are still problems in the matching of the number of parallel gaps, installation positions a...Show More
Analysis and Treatment of Abnormal Growth of Total Hydrocarbon in ±800kV Converter Transformer
Xiu Zhou;Qingping Zhang;Xutao Wu;Tian Tian;Bo Niu;Jin Bai;Xiuguang Li
2022 7th Asia Conference on Power and Electrical Engineering (ACPEE)
Year: 2022 | Conference Paper |
Cited by: Papers (1)
This paper conducts research and analysis on the abnormal condition of total hydrocarbon in the main body of ±800kV Lingzhou UHV converter station of Ningxia power grid during operation. Firstly, through the on-line and off-line observation and analysis of oil chromatographic data, and then through the licensing of live and power failure test data, and through the return to the plant physical exam...Show More
Analysis of Multipoint Grounding Abnormality of Main Transformer
Xiu Zhou;Qing Ping Zhang;Fei Yue Ma;Tian Tian;Yan Luo;Xiu Guang Li;Ning Hui He
2022 7th Asia Conference on Power and Electrical Engineering (ACPEE)
Year: 2022 | Conference Paper |
The health condition of transformer is related to the safe and stable operation of power grid. This paper introduces the reason of abnormal grounding current of iron core and clamp of 750kV main transformer. Firstly, the on-line monitoring device is used for real-time monitoring, and then the current limiting resistance is added at the iron core grounding lead down line to reduce the grounding cur...Show More
Study on Fault Diagnosis of Metal Oxide Surge Arrester Based on Infrared Detection and Leakage Current Detection
2022 7th Asia Conference on Power and Electrical Engineering (ACPEE)
Year: 2022 | Conference Paper |
Cited by: Papers (1)
As an efficient and safe non-contact live detection method, infrared detection technology is widely used in MOA state detection. However, due to the limitations of this detection method and the low detection accuracy, it has caused a loss of manpower and material resources. This paper proposes a multi-criteria joint detection method based on infrared detection and leakage current detection, which ...Show More
Research on Key Parameters of Long-term Induced Withstand Voltage and Partial Discharge Test for ±800 kV Converter Transformer in Lingzhou and Interference Elimination of Partial Discharge
Xiu Zhou;Xin Yang;Xutao Wu;Tian Tian;Wenrong Si;Wenzhi Chang;Xiaolin Zhao;Xingwang Wu;Xiuguang Li;Ninghui He
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)
Year: 2021 | Conference Paper |
During the tests of long-term induced withstand voltage on site and handover partial discharge for ± 800 kV UHV converter transformers in Lingzhou, in accordance with the requirements of the regulations and standards for the above tests, the differences between the two types of converter transformers with angle valve and star valve in the two tests were studied respectively. And the parameters of ...Show More
Research on Key Parameters of Long-term Induced Withstand Voltage and Partial Discharge Test for ±800 kV Converter Transformer in Lingzhou and Interference Elimination of Partial Discharge
Xiu Zhou;Xin Yang;Xutao Wu;Tian Tian;Wenrong Si;Wenzhi Chang;Xiaolin Zhao;Xingwang Wu;Xiuguang Li;Ninghui He
Year: 2021 | Conference Paper |
Trend Analysis of Dissolved Gas in Oil for Transformer
Qingzhu Yang;YangChun Cheng;Ninghui He;Xutao Wu;Weiyan Sha;Xiu Zhou
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)
Year: 2021 | Conference Paper |
Transformer’s dissolved gas analysis(DGA) is a very important means of transformer condition maintenance. With the development of technology, more and more transformers have been installed with online DGA devices,but there is no standard to determine the abnormal gas generation rate of dissolved gas in on-line oil. In order to mine the information of transformer online monitoring data, this paper ...Show More
Application of Converter Transformer Defect Detection Based on Transformer Integrated Monitoring System
Xiu Zhou;Qingping Zhang;Bo Wang;Yuhua Xu;Tian Tian;Yunlong Ma;Xiuguang Li;Ninghui He;Liang Li;Weiyan Sha
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)
Year: 2021 | Conference Paper |
This paper introduces an abnormal oil color spectrum of converter transformer during commissioning of UHVDC transmission project. The application of transformer integrated monitoring system based on ultrasonic local discharge, UHF local discharge and high frequency local discharge integrated software and hardware is used to detect and locate the floating potential discharge defects of converter tr...Show More
Research on Gas Movement Law of Fault Discharge in Transformer Oil
Xiu Zhou;Tian Tian;Ningbo Liu;Yan Luo;Xiuguang Li;Ninghui He;Yunlong Ma;Jun Sun
2021 11th International Conference on Power and Energy Systems (ICPES)
Year: 2021 | Conference Paper |
Cited by: Papers (2)
Power transformers always experience problems such as ageing, overheating or discharging faults during the process of the transformer, resulting in the decomposition of the insulating superheating paper and the insulating oil. This phenomenon leads directly to the generation of dissolved gases in the oil, which diffuses through the oil and then reaches equilibrium. In this paper, molecular dynamic...Show More
Defect Analysis and Preventive Measures of Main Transformer Bushing Based on Frequency Domain Dielectric Spectroscopy
Xiu Zhou;Zhonghua Xiang;Guozhi Zhang;Wenzhi Chang;Xiaolin Zhao;Xingwang Wu;Tian Tian
2021 IEEE 4th International Electrical and Energy Conference (CIEEC)
Year: 2021 | Conference Paper |
Cited by: Papers (1)
The health status of main transformer bushing is directly related to the safe and stable operation of power grid. This paper introduces an abnormal dielectric loss factor of glass fiber reinforced plastic dry bushing of 220 kV main transformer. Firstly, the casing defects were determined based on the frequency domain dielectric spectrum. Then, the causes of the casing defects were analyzed by the ...Show More
Evaluation method of power transformer operation state and its field application
Xiu Zhou;Qing ping Zhang;Tian-Tian;Xiu guang Li;Ning hui He;Yun long Ma;Yan Luo;Liang Li;Kai Yi
2021 6th Asia Conference on Power and Electrical Engineering (ACPEE)
Year: 2021 | Conference Paper |
In order to scientifically and reasonably evaluate the operation state of power transformer in operation, a three-level evaluation model is established according to the key characteristic information of transformer. The health index theory is introduced to deduce the calculation method of health level of transformer three-level evaluation model, and the calculation formula of transformer residual ...Show More
Analysis on Low Secondary Voltage of a 220kV bus CVT
Xiu Zhou;Qing ping Zhang;Bo Niu;Tian Tian;Xiu guang Li;Ning hui He;Yan Luo;Yu hua Xu;Lu Tian
2021 6th Asia Conference on Power and Electrical Engineering (ACPEE)
Year: 2021 | Conference Paper |
Cited by: Papers (3)
This paper summarized the defects of a 220kV busbar capacitive voltage transformer (CVT) whose secondary voltage was too low. The technical parameters and working principle of the capacitive voltage transformer were introduced. Through infrared temperature measurement, power failure diagnostic test and disintegration inspection, the causes of such problems as the low secondary voltage of the 220kV...Show More
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