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The Resonant Optimization and Inverse Analysis of Vibration Capacitance Electrostatic Probe
The phenomenon of charge accumulation poses a significant threat to the electrical and aerospace industries. The accurate measurement and inverse analysis of surface charge has been a topic of great interest among scholars. To enhance the performance of electrostatic sensors, this article proposes a mechanical vibration structure with a double resonator resonance driving method. A new vibration st...Show More
Influence of Multi-Order Harmonic Voltage on Degradation in Epoxy Resin Layer of High Voltage Valve Side Bushing
IEEE Transactions on Dielectrics and Electrical Insulation
Year: 2025 | Early Access Article |
The internal insulation characteristics of dry-type valve-side bushings in converter transformers under electrical and thermal complex stresses in ultra-high voltage direct current (UHVDC) transmission system are important for ensuring safe and stable operation. In this paper, an UHVDC transmission model is established to simulate the composite voltage waveform containing multiple high-frequency h...Show More
Research on the Extinguishing Peak Characteristics of Air Arc in the Model Extinguishing Chamber
Liujun Zhou;Hao Sun;Xinyu Zhnag;Yi Wu;Chunping Niu;Zifeng Wang
2024 7th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)
Year: 2024 | Conference Paper |
In order to investigate the waveform changes of arc voltage before zero crossing in the arc extinguishing chamber, this paper constructed a model of the arc extinguishing chamber for arc ignition experiments. The experiment collects and records the arc voltage waveforms using an oscilloscope and captures the dynamic characteristics of the arc during the experiment with a high-speed camera. The exp...Show More
Study on Post-Arc Recovery Characteristic Test of SF6 Mixed Gas
2024 7th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)
Year: 2024 | Conference Paper |
SF6 gas is widely used in medium and high voltage electrical equipment due to its high insulation strength and strong arc extinguishing performance. However, due to its strong greenhouse effect, efforts are being made to limit its emissions. By adding an appropriate amount of buffer gas, the insulation and arc extinguishing performance of the gas can be maintained, while reducing the greenhouse ef...Show More
A Method for Calculating and Realising the Dynamic Characteristics of an Electromagnetic Contactor
Lingzhi Tang;Hao Sun;Zifeng Wang;Chunping Niu;Yi Wu;Shuwu Wei;Zhihua Wu
2024 7th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)
Year: 2024 | Conference Paper |
A contactor is a low-voltage switchgear device widely used in the power system. This study provides a method for the calculation and implementation of the dynamic characteristics of contactors through self-developed manual programming. The computation is divided into two calculations: the current and the motion. In the current calculation, the input parameters include the voltage waveform and othe...Show More
Evaluation and Optimization of Circuit Breaker Opening Performance Based on Arc Simulation
2024 7th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)
Year: 2024 | Conference Paper |
Circuit breakers play a crucial role in ensuring the safety and reliability of power systems by interrupting circuits during electrical faults. However, the matching between the operating mechanism design and the arc chamber airflow field has been seldom addressed in previous studies, which has somewhat constrained the enhancement and optimization of circuit breaker performance. Addressing this is...Show More
Research on the Influence of Different Proportions of Copper-Tungsten Material Electrodes on Ablation Characteristics
Xinyu Zhang;Hao Sun;Liujun Zhou;Chunping Niu;Yi Wu;Zifeng Wang
2024 7th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)
Year: 2024 | Conference Paper |
With the increasing voltage level of the power system, there are higher requirements for the interruption performance of high-voltage circuit breakers, the contact electrical endurance of the circuit breaker also needs to be improved accordingly. The copper-tungsten electrode is widely used as arc contact of high voltage gas circuit breakers due to its good ablation resistance. Its ablation resist...Show More
Comparison of the Effect of H2 and O2 on SF6 Degradation by Hot Plasma
2024 7th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)
Year: 2024 | Conference Paper |
SF6 has good insulation performance and arc extinguishing performance, which is more and more widely used in the power industry, and its emissions are also rising year by year. SF6 has a very high GWP value, 23,900 times that of CO2, and it is almost impossible to decompose in nature, so the harmless degradation of SF6 is extra important. In this work, we carried out flow degradation treatment of ...Show More
Temperature Characterization of Epoxy Resin Electrical Tree Insulation Under a Multi Harmonic Composite Voltage
2024 10th International Conference on Condition Monitoring and Diagnosis (CMD)
Year: 2024 | Conference Paper |
The valve side dry bushing of the converter station is a crucial component of the high voltage direct current transmission system. The dry bushing carries AC and DC voltages with multi order harmonics under operating conditions and is vulnerable to insulation defects at the edge of the pole plate, leading to partial discharges and resulting in insulation failure. Mastering the characteristics of e...Show More
Study on Partial Discharge Characteristics under the Thermal-Electrical Coupling Effect of Epoxy-impregnated Paper Insulation in High-Voltage Dry-type Valve Side Bushing
Wanhao Shi;Xuandong Liu;Hao Sun;Gaoyi Shang;Yingman Sun;Hao Tang;Xining Li
2024 10th International Conference on Condition Monitoring and Diagnosis (CMD)
Year: 2024 | Conference Paper |
As a critical component connecting the converter transformer and the converter valve, the valve-side dry-type bushing serves both electrical insulation and mechanical support functions. However, the harsh operating environment of the valve-side bushing often leads to insulation failures due to partial discharge under long-term electro-thermal coupling effects, resulting in significant economic los...Show More
Effect of Temperature on the Conducting and Partial Discharge Characteristics of Electrical Trees Under Combined AC and DC Voltage in Epoxy Resin
Yingman Sun;Xuandong Liu;Gaoyi Shang;Hao Sun;Wanhao Shi;Hao Tang;Xining Li
2024 10th International Conference on Condition Monitoring and Diagnosis (CMD)
Year: 2024 | Conference Paper |
The valve-side dry-type bushing, designed to withstand various voltages, faces significant safety risks from manufacturing defects that can lead to electrical trees and partial discharge, causing insulation degradation and breakdown. An experimental platform was constructed to investigate the relationship between reflection imaging features and partial discharge of electrical trees using epoxy res...Show More
On the Speed of Arc Cooling in Air and SF6
2024 7th International Conference on Energy, Electrical and Power Engineering (CEEPE)
Year: 2024 | Conference Paper |
Cited by: Papers (1)
This study is devoted to a theoretical understanding of the causes for the different arc cooling speed in air and SF6, proving support to the design of SF6-free high voltage circuit breakers. Based on a slender arc in a supersonic nozzle, it is shown why the material properties control the radial temperature profile of the arc column and how this affects the behavior of arc cooling.Show More
Multi-physical Field Model and Measurement Accuracy Error Analysis for DC GIS Resistorcapacitor Voltage Dividers
2024 7th International Conference on Energy, Electrical and Power Engineering (CEEPE)
Year: 2024 | Conference Paper |
Resistor-capacitor voltage divider (RCVD), as the main voltage divider used in conventional/flexible DC transmission, DC power grids, new energy grid connection and other projects both domestically and internationally, has the simple principle, reliable component performance and mature technical support. However, the stray capacitance (SC) of RCVD to the ground and the resistance temperature drift...Show More
Dielectric Strength Recovery After Gas Arcs of Low-Voltage DC Hybrid Interruption
Investigating the post-arc dielectric strength recovery characteristics is essential for dc hybrid interruption, because a successful interruption in a hybrid dc switch is determined by the competition between the power system recovery voltage and post-arc dielectric strength recovery voltage. Based on a review of previous studies, related research is inadequate in the recovery of gas dielectric s...Show More
Comparsion of CO2 Nozzle Arc Simulation During Current Zero Period based on the Non-CE and LTE Models
2022 6th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)
Year: 2022 | Conference Paper |
Cited by: Papers (1)
The dynamic arc behavior during the current zero (CZ) period is different from that of the arc burning stage. The rapid decay of temperature leads to a rapid decrease in the chemical reaction rate inside the arc plasma. Therefore, a new numerical model needs to be established to reflect the non-chemically equilibrium (non-CE) effect on the arc decay process. The dynamic behavior of CO2 nozzle arc ...Show More
Research on the evaluation method of eco-friendly gas in the application of high voltage circuit breaker
2022 6th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)
Year: 2022 | Conference Paper |
Cited by: Papers (1)
In this paper, a comprehensive evaluation method on the insulation performance and greenhouse effect of environmentally-friendly gas was studied. Firstly, considering that the gas greenhouse effect is determined by its atmospheric lifetime and infrared characteristics, and can be assessed by the global warming potential (GWP), this work establishes a regression prediction method for atmospheric li...Show More
A Novel Method for Determining the Electrode Temperature Effect on Post-Arc Breakdown Characteristics
2022 6th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)
Year: 2022 | Conference Paper |
During the post-arc stage of the interruption process, hot gases, high-temperature electrodes, and metallic macroparticles could strictly hinder the recovery of dielectric strength. Despite many studies focusing on the mechanism of the post-arc phenomenon, there is still a lack of comprehension determining the role of electrodes during the breakdown process. In this paper, the electrode temperatur...Show More
Discharge Characteristics of Fusion Plasma Jet Array and its Influencing Factors
The downstream uniformity of the atmospheric-pressure plasma jet (APPJ) array is a key technical problem with regard to large-scale applications nowadays. However, as the only array that can achieve large uniform plasma action area currently, the discharge characteristics and its influencing factors of the fusion plasma jet array have not been fully studied. In order to solve this problem, this ar...Show More
Efficient Conversion of Greenhouse Gas into Value-Added Chemicals with Non-Thermal Nanosecond Pulsed Plasma
2020 IEEE International Conference on Plasma Science (ICOPS)
Year: 2020 | Conference Paper |
Converting greenhouse gas into value-added chemicals and fuels is one of the biggest technical challenges in 21st century1. Non-thermal plasma (NTP) technology is a promising way to tackle this challenge, owing to its high efficiency in overcoming the thermodynamic limitation of reactions under mild conditions. In this paper, non-thermal plasma driven by nanosecond pulse power source, has been uti...Show More
Microsecond Pulsed Spark Discharge Plasma Treatment on Heavy Oil Model Compounds for Hydrogen Production
2020 IEEE International Conference on Plasma Science (ICOPS)
Year: 2020 | Conference Paper |
It is a novel technology to apply plasma for converting heavy oil into valuable chemical products1. The spark discharge, in which the gas temperature is between arc discharge and dielectric barrier discharge, has a potential for efficient hydrogen production due to its high conversion rate, high conversion efficiency and low requirements2. In this study, we used a needle-plate reactor which was po...Show More
Finding substitutes for sulfur hexafluoride (SF6), a gas with extremely high global warming potential, has been a persistent effort for years in the field of high voltage power equipment, which focuses on the evaluation of the electrical strength and boiling temperature for the practical purpose. Following up the previous proposed linear regression models, this work introduces machine learning alg...Show More
XJTU: Typical Arrangements for Downstream Uniformity Assessment in Atmospheric-Pressure Plasma Jet Arrays
Qiang Ren;Xuandong Liu;Hao Sun;Chengwei Huang;Feiyan Zhou;Ming Chen;Chengjun Liang
The downstream uniformity of the atmospheric-pressure plasma jet array is a key technical problem in regards to large-scale applications. This paper presents a 2-D array device of five jets arranged in four different shapes designed from the perspective of symmetry. Various schemes were tested to determine the effects of jet arrangement on the downstream uniformity of the array: the completely sym...Show More
Calculation of the Switch Arc in Low Voltage Circuit Breaker Considering the Interaction Between the Contact Movement and the Arc Force
Hao Sun;Hyun-Woo Joo;Yi Wu;Mingzhe Rong;Chae-Yoon Bae;Young-Geun Kim
2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)
Year: 2019 | Conference Paper |
Cited by: Papers (4)
During the interruption, the separation of the contacts plays an important role in different kinds of switch gears since the arc motion or the arc elongation will be affected. The movement of the contact could increase the arc length and then decide the arc behavior. In reverse, the arc current will be changed during the interruption and the Lorentz force will then influence the movement of the co...Show More
A New Prediction Model of SF6 Alternative Gases in Electrical Strength
Luqi Liang;Yi Wu;Hao Sun;Mingzhe Rong;Chunlin Wang;Haodong Chang
2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)
Year: 2019 | Conference Paper |
Cited by: Papers (3)
Sulfur-Hexafluoride (SF6) has been widely used for gas insulation in power industry. However, due to its high Global Warming Potential (GWP), considerable effort has been undertaken to find eco-friendly replacement gases but without significant success for decades. In the study of alternative gas searching, the large number of candidate alternative gases limits the searching approach by the experi...Show More
Experimental Study on the Influence of Different Opening Speed on Post-Arc Current in DCCB
2019 5th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)
Year: 2019 | Conference Paper |
The pre-charged capacitor method, used in the active current injection circuit breaker in DC system, is an effective approach to realize the current injection. However, in practical applications, the performances of post-arc among different opening speed are still unknown, which have been an obstacle that blocks the design of MV DCCB. To solve this problem, high resolution measuring equipment was ...Show More
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