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An Oil Flow Velocity In Situ Sensor for Power Transformers Based on Laser Doppler Effect
Bo Qi;Kehan Zhu;Chunyi Wang;Meng Huang;Shupeng Yang;Chengrong Li
IEEE Transactions on Instrumentation and Measurement
Year: 2025 | Early Access Article |
The assessment of the power transformers health status has garnered significant attention. The oil flow velocity serves as a critical parameter for assessing the severity of internal faults in oil-immersed power transformers, and its effective monitoring can accurately reflect the operational state of power transformers. The operational principle of existing transformer heavy gas protection involv...Show More
Charge Transport Model of Oil-pressboard Composite Insulation Structure Considering Interface Barrier and Ion Migration
Meng Huang;Zilu Wang;Lu Wang;Zixuan Yu;Yiran Li;Weiguang You;Bo Qi
IEEE Transactions on Dielectrics and Electrical Insulation
Year: 2025 | Early Access Article |
Charge accumulation at the interface of oil-pressboard insulation in converter transformers increases the risk of insulation failure. Current models overlook pressboard and oil individual characteristics and neglect heterojunction effects at the pressboard-oil interface in insulation. To address these issues, this paper proposes a simulation model that combines the bipolar carrier model and the io...Show More
Multi-parameter detection of discharge defects in the gap multi-metal conduit in transformer bushing
Wenhao Li;Yuan La;Yao Yuan;Zengchao Wang;Kejie Huang;Zheran Zheng;Miaorui Zhang;Yuan Luo;Meng Huang
20th International Conference on AC and DC Power Transmission 2024 (ACDC 2024)
Year: 2024 | Conference Paper |
In power transformer, oil-paper insulation bushing is a common outlet assembly, which has many failures and causes great losses. Due to its randomness, the gap discharge of multi-metal conduit is difficult to be detected by the monitoring device during operation, resulting in the failure of the insulation oil inside the casing, and the casing can not continue to run in serious cases. In this paper...Show More
Multi-parameter sensing scheme based on monitoring of distribution trasformers
Yuan Gui;Jing Li;Meng Shuai;Xijuan Yu;Ruoxi Liu;Yu Wen;Shupeng Yang;Meng Huang
20th International Conference on AC and DC Power Transmission 2024 (ACDC 2024)
Year: 2024 | Conference Paper |
As the core equipment of distribution system, its safe and stable operation of distribution transformer directly affects the reliability of distribution network operation. However, the current monitoring methods for distribution transformers are insufficient, which cannot ensure real-time online monitoring and its monitoring parameters are relatively single. Therefore, according to the multi-param...Show More
Fault monitoring layout optimization based on acoustic simulation of 500kV transformer
Bo Qi;Runsheng Yang;Chunyi Wang;Ruibo Zhang;Shupeng Yang;Meng Huang
20th International Conference on AC and DC Power Transmission 2024 (ACDC 2024)
Year: 2024 | Conference Paper |
Large transformers are important devices in the new energy transmission system, and their operational stability is crucial to the power system. Ultrasonic monitoring method is a commonly used means of online monitoring of transformers, but the existing studies mainly focus on transformers of 220kV and below. In order to solve the problem of less research on the characteristics of ultrasonic signal...Show More
Space Charge Simulation Model for Bilayer Oil-impregnated Paper Insulation Based on Multiple Discrete Trap Energy Levels
Meng Huang;Lu Wang;Zilu Wang;Shilonng Niu;Weiguang You;Bo Qi
IEEE Transactions on Dielectrics and Electrical Insulation
Year: 2024 | Early Access Article |
Space charge-induced electric field distortion seriously threatens dielectric insulation properties. However, there are fewer simulation studies on the interfacial charge of the same dielectric structure such as bilayer oil-impregnated paper. In this paper, based on the bipolar carrier transport model, a multiple discrete trap energy levels carrier transport model is proposed to simulate the space...Show More
A Highly Sensitive and Durable Sensor for In Situ Hydrogen Measurement in Transformer Oil
Kehan Zhu;Bo Qi;Mao Ji;Meng Huang;Chunjia Gao;Xiao Yang;Hua Jin;Chengrong Li
Dissolved hydrogen, which serves as the primary indicative gas for early failures in oil-immersed transformers, can be monitored to provide early warning signs. However, current online monitoring methods for dissolved hydrogen suffer from drawbacks including low sensitivity, poor durability, and limited precision thereby failing to determine equipment status promptly and reliably. To overcome thes...Show More
Discharge Stage Divison of Oil-pressboard Insulation based on the Amplitude Variation of Electrical-Magnetic-Acoustic Signal
Meng Huang;Changming Jiang;Zilu Wang;Yunpeng Tang;Kehan Zhu;Zhen Hao
2024 6th Asia Energy and Electrical Engineering Symposium (AEEES)
Year: 2024 | Conference Paper |
Surface discharge is one of the most serious types of discharge faults in transformer oil-paper insulation structures. In order to accurately obtain the changes in characteristic parameters during the development process of surface discharge of oil-paper insulation under AC voltage, a simulation experimental platform for the development process of surface discharge was built and a measurement syst...Show More
Difference of Partial Discharge Behavior in Large Transformers and Small Defect Model Caused by Capacitance
Changming Jiang;Meng Huang;Yunpeng Tang;Chengyang Xiong;Zhen Hao;Guangwei Liu
2024 6th Asia Energy and Electrical Engineering Symposium (AEEES)
Year: 2024 | Conference Paper |
Partial discharge is an important indicator of the aging of oil impregnated paper insulation, and online monitoring and analysis of it is of great significance for ensuring the safe operation of transformers. However, the existing partial discharge detection methods are mostly based on the equivalent model of gap discharge, ignoring the capacitance effect of the transformer interior, resulting in ...Show More
Optical Sensor with Wide Range and High Sensitivity for Internal Magnetic Field Detection of Transformer
The deterioration of winding defects is one of the important causes of power transformer fires and even explosion failures. The change of leakage magnetic field distribution is the most direct response to winding defects. Currently there are few sensors suitable for online measurement of the internal magnetic field of transformers. Based on the Faraday magneto-optical effect, a magnetic field sens...Show More
Metal-Free Optical Pressure Sensor with High Sensitivity and Extensive Range
Pressure monitoring of a transformer oil tank can grasp the pressure change process caused by gas production when severe internal defects occur and take timely measures to ensure the safe operation of the transformer. Existing pressure sensors generally use metal encapsulation or have an air cavity structure, threatening the transformer's insulation if it is directly used inside the transformer. T...Show More
Distribution Pattern and Differentiation Thresholds of Gas Content in Large Oil-Filled Equipment
2023 IEEE 7th Conference on Energy Internet and Energy System Integration (EI2)
Year: 2023 | Conference Paper |
In the existing threshold calculation methods, there are problems such as establishing distribution models based on large group data of different types of oil-filled equipment, or specifying the threshold using normal dissolved gases analysis (DGA) data of some individuals while fault data of others, etc. In order to address these problems, this paper proposes a differentiation gas content thresho...Show More
Simulation and Verification of Magnetic Field Distribution in Transformer Oil Tank Based on Finite Element Method
2023 5th International Academic Exchange Conference on Science and Technology Innovation (IAECST)
Year: 2023 | Conference Paper |
As the key equipment in power transportation, the related characteristics of transformer in operation are the focus of transformer monitoring and protection. The existing research on the magnetic field distribution characteristics of transformer focuses on the inside of transformer tank. However, due to the poor electromagnetic environment inside the transformer, considering the influence of insul...Show More
Electric-Magnetic-Acoustic Characteristics of Surface Discharges along Oil-paper Insulation
Changming Jiang;Meng Huang;Yunpeng Tang;Zhen Hao;Chunjia Gao;Guangwei Liu;Chunyi Wang
2023 5th International Academic Exchange Conference on Science and Technology Innovation (IAECST)
Year: 2023 | Conference Paper |
Surface discharge is one of the most severe discharge faults in transformer oil-paper insulation structures. In order to accurately obtain the variation characteristics of characteristic parameters during the development process of surface discharge under AC voltage, this study constructed a simulation experimental platform for the development process of surface discharge and established a measure...Show More
Simulation of Influence of Multi-Point Ground Fault Position on Current of 800kv Converter Transformer
2023 5th International Academic Exchange Conference on Science and Technology Innovation (IAECST)
Year: 2023 | Conference Paper |
The multi-point grounding faults of the core of UHV converter transformer are studied. The homogenization modeling method is used to simplify the core processing of transformer, and the equivalent model is used for finite element simulation to calculate the grounding currents between different grounding points. The results show that the grounding current increases with the increase of the distance...Show More
Effect of Carrier Mobility on Corona Discharge of Transformer Oil Under DC Voltage
The insulation performance improvement of transformer oil under dc voltage is of great significance in reducing the fault of the converter transformer. The nano-modified transformer oil has excellent electrical properties, but the research on corona discharge characteristics under dc voltage is insufficient. This article studied the corona discharge characteristics of SiO2 and TiO2 nanofluids (NFs...Show More
Differential Characteristics of Dissolved Acetylene Gas Threshold Value in Transformer Oil
Rui Liu;Tianhe Yang;Qing He;Yu Zhang;Yalong Tu;Yunxiao Zhang;Meng Huang
2023 International Conference on Power Energy Systems and Applications (ICoPESA)
Year: 2023 | Conference Paper |
The content of acetylene is one of the important indicators of transformer fault diagnosis. Due to the differences between individual transformers, the content of acetylene gas varies greatly. The adoption of a single threshold is likely to lead to false alarm or missing report of the diagnosis results. The difference of gas threshold in oil has been paid more and more attention, but the differenc...Show More
A Simplified Method to Estimate Surface Trap Distribution: Potential Decay by Charge Dissipation Along Surface
Bo Qi;Zhuodong Yang;Xiao Yang;Yuan Luo;Meng Huang;Chunjia Gao;Yi Zhang;Chengrong Li
Gas-insulated equipment is indispensable in dc transmission systems. Under the dc field, the surface charge accumulation could induce insulation failure. While the surface trap characteristic is a significant factor in surface charge accumulation and transportation, the surface trap distribution is often measured by the surface potential decay (SPD) method, where surface charges dissipate through ...Show More
PEA–Kerr Combined Measurement Method for Space Charge and Electric Field Distribution of Oil–Paper Composite Insulation
Meng Huang;Weiguang You;Yanyu Wu;Lei Zhang;Yiran Li;Chunjia Gao;Bo Qi
The distribution of space charge and electric field of oil–paper composite insulation is of great importance to the operation and design of converter transformers. However, the widely used pulsed electric-acoustic (PEA) method and Kerr method are difficult to measure the structure of thick pressboard + oil independently. In this article, a PEA–Kerr combined measurement method is proposed. It can n...Show More
Relationship Between Porosity and Dielectric Constant and Tensile Strength of Insulating Paper
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)
Year: 2021 | Conference Paper |
It is found that when the structural properties of insulating paper are changed, its electrical properties also change significantly, but the mechanism is not clear, which makes us unable to choose the best structural parameters. Therefore, this paper starts from the porosity structure parameter to explore its influence on the dielectric constant and tensile strength of insulating paper. The resul...Show More
Simulation of the Effect of Dielectric Match on Surface Flashover along Oil-Paper Insulation
2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)
Year: 2021 | Conference Paper |
One of the weak points of oil-paper insulation in transformer insulation system is that a large number of interfaces formed by oil and oil-impregnated paperboard are prone to surface flashover. Among them, the dielectric match degree between oil and paperboard is one of the key factors affecting the development of flashover along the surface of oil-impregnated paperboard. Here, the match degree re...Show More
Influencing Mechanism of Adhesive on Partial Discharge of Pressboard Block under AC/DC Composite Voltage
Yi Zhang;Bo Qi;Yukun Ma;Meng Huang;Qing Yuan;Yuzhen Lv;Yanqiu Jiao;Chengrong Li;Shuqi Zhang
The phenolic adhesive and casein adhesive are two kinds of adhesives used in pressboard block production. The partial discharge characteristics of pressboard block containing the two types of adhesives under AC, DC and AC/DC composite voltage are researched in this paper. Using the block samples with phenolic adhesive or casein adhesive, the partial discharge characteristics, flashover characteris...Show More
Construction of Nanocellulose Sandwich-structured Insulating Paper and Its Enhancement for Mechanical and Electrical Properties
Xin Huang;Yuanxiang Zhou;Quzong Gesang;Ling Zhang;Yunxiao Zhang;Chenyuan Teng;Meng Huang
Sandwich-structured nanocomposites have the potential to improve the mechanical and electrical properties of materials simultaneously. Nanofibrillated cellulose (NFC) modified paper sheet (denominated as N) and softwood paper sheet (denominated as P) are used to prepare insulating paper. Different kinds of insulating paper with the structures of PPP, NNN, NPN and PNP are prepared. Tensile strength...Show More
The Influence of Positive Temperature Coefficient Material on the DC Electric Field within Epoxy Composites
Chenyuan Teng;Yuanxiang Zhou;Ling Zhang;Yunxiao Zhang;Xuewei Wang;Zixia Cheng;Meng Huang
2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
Year: 2020 | Conference Paper |
Cited by: Papers (1)
Negative temperature (NT) coefficient electrical resistivity of insulating materials causes the distortion of DC electric field, increasing the design and manufacture difficulty of HVDC equipment. The ceramic with positive temperature coefficient (PTC) electrical resistivity was doped into epoxy resin to weaken its temperature dependence of electrical resistivity (0~35 wt%). The electric field and...Show More
Surface Discharge Characteristics of Epoxy Resin in SF6 Gas under Switching and Lightning Impulse Voltages
Hanlin Song;Yanyu Wu;Hao Tang;Xiu Zhou;Yinghui Chai;Bingliang Shan;Meng Huang;Wei Wang
2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
Year: 2020 | Conference Paper |
UHV DC wall bushing is the core equipment connecting the valve hall and DC field in converter station and failure occurs to it frequently under impulse voltages. Surface flashover experiment under impulse voltages was conducted on epoxy resin, which has been widely used as insulation material in 1100kV wall bushing. Surface discharge voltages of epoxy resin under the standard lightning and switchi...Show More
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