Table of Content

30 August 2023, Volume 0 Issue 8

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Research & Analysis

Analysis on Bounce Characteristics of Cu-W Composite Contact with Micro-Oriented Structure

HAN Ying, HUANG Xin, LIU Dongrui, HOU Chunguang

2023, 0(8):  1-9.  doi:10.16628/j.cnki.2095-8188.2023.08.001

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The commercial disordered structure Cu-W contact and three kinds of micro-oriented Cu-W composite contacts were taken as the research object. Through the establishment of contactor contact bounce dynamics model, the electromagnetic model and the contact mechanics model, the machine-electric-magnetic multi-physics coupling simulation analysis of the contactor was implemented. The stress-strain difference of the three micro-oriented structure and commercial disordered structure Cu-W contact under load was studied. The influence of the three micro-oriented structure and commercial disordered structure Cu-W contact on contact bounce was analized and verified through experiment. The micro-oriented structure contact was found to have smaller bounce amplitudes and shorter bounce times. The results show that compared with commercial disordered structure Cu-W contacts, the micro-oriented Cu-W composite contacts have better bounce resistance, and Cu-W contact with the rhombic dodecahedron frame structure possess the best anti-bounce characteristics.

Modelingand Simulation Analysis of New High-Power DC Relays

LI Min, CHEN Ping

2023, 0(8):  10-16.  doi:10.16628/j.cnki.2095-8188.2023.08.002

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The structure of high-voltage DC relay is generally very compac. The lack of an arc extinguishing chamber results in high difficulty in extinguishing the arc. In order to solve the existing problems, a new high-power DC relay is developed. Different from the traditional relay, the new type of relay utilizes a motor to drive a gear transmission mechanism to separate the dynamic and the static contacts. The compact transmission mechanism makes the breaking gap enough, which can reach 12~15 mm and effectively break the high voltage and high current. Based on the MHD model, using the Comsol Multiphysics finite element software to establish the new relay two-dimensional symmetrical model, the arcs of the relay under different factors are simulated and the relationship between different factors and the arcing time is analyzed, which can determine the appropriate value range of each factor and also prove the arcing ability of the new relay.

Research on Short-Circuit Arc Breaking Characteristics of Medium Voltage DC Air Circuit Breaker

YI Chenxi, LI Jing, PENG Shidong, LIU Shuxin

2023, 0(8):  17-23.  doi:10.16628/j.cnki.2095-8188.2023.08.003

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Based on the theory of magnetohydrodynamics, considering the influence of space turbulence, a large space full dynamic arc model of multiphysics simulation coupled medium voltage DC air circuit breaker is built to simulate the short-circuit breaking arc of medium voltage DC air circuit breaker. The results show that during the short-circuit arc breaking process of medium voltage DC air circuit breakers, the transfer of arc roots will cause fluctuations in arc voltage, arc current and arc power, and then the arc roots will exhibit stickiness. The arc column area between the grids will generate reverse arc phenomena. The extinguishing speed of the arc is positively correlated with the magnitude of the applied magnetic field, but the trend of change does not show a linear relationship, which can provide a theoretical basis for solving the hard problem of consciousness of breaking short circuit current of medium voltage DC air circuit breaker.

Research on Rotating Arc Extinguishing to Breaking Technology of High Voltage DC Contactors

LI Sihong, ZHOU Yingzi, LIANG Cheng

2023, 0(8):  24-28.  doi:10.16628/j.cnki.2095-8188.2023.08.004

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Against the backdrop of new opportunities brought by the electrification of automobiles to various industries, this paper elaborates on the arc extinguishing scheme of new high voltage DC contactors in the field of new energy applications. To improve the arc extinguishing ability of DC contactors to adapt to gradually increasing voltage levels, a prototype based on rotating arc extinguishing principle was developed. Combining modeling and simulation with actual working conditions, the electrical performance and ultimate breaking capacity of the product were verified, and the experimental waveforms were provided. The results show that the performance of rotating arc extinguishing technology roadmap can be improved by using air-dielectric.

Analysis on Vibration Characteristic of Contactor Based on Modelica

ZHAO Yong, MA Wei, WANG Jianxiong

2023, 0(8):  29-32.  doi:10.16628/j.cnki.2095-8188.2023.08.005

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To study the failure mechanism of contactors in vibration environments, taking a high-voltage DC contactor as an example, the mathematical model of its four degree of freedom vibration system is built and solved using Modelica, which is a language based on equations. By defining the acceleration amplification factor and analyzing the influence factors, it is found that the acceleration amplification factor is decreasing and the anti-vibration characteristics of the product is improving with the increase of the spacer stiffness. Finally, the measured acceleration amplification factor is obtained by testing two different material of spacers on the vibration test-bed. The measured data is consistent with the theoretical results. The conclusions are valuable for the anti-vibration design of the product.

Electrical Design & Discussion

Study on Design and Simulation of Aviation Electrical System’s Interface Circuit

WANG Kunyu, WU Jianwen, CHEN Ruang, XIA Shangwen, ZHAO Wei

2023, 0(8):  33-40.  doi:10.16628/j.cnki.2095-8188.2023.08.006

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In aviation and low-voltage power systems, many signals are transmitted and processed through interface circuits. In recent years, the widespread application of domestically produced devices and the urgency of production design tasks have put forward new requirements for interface circuit simulation. Focusing on the specific domain modeling requirements of model-based system engineering (MBSE) in the aviation and industrial fields of China, a current signal output circuit is designed, Saber software is used to complete the "device circuit" level by level modeling and simulation, and the corresponding hardware circuits is combined to conduct theoretical, simulation and experimental comparisons of static function and dynamic performance. The results show that the modeling method can effectively integrate the speed and accuracy of modeling and simulation, which is beneficial for optimizing the interface circuit design process and improving the degree of digitization. It can provide the model support for the model-based system engineering in the aviation and industrial fields of China.

Modeling and Design of a High Frequency Non-ideal Flyback Converter in DCM

ZHANG Wenqi, XU Yuzhen, ZHENG Qingliang

2023, 0(8):  41-46.  doi:10.16628/j.cnki.2095-8188.2023.08.007

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Aiming at the problem of misleading the design of compensation parameters caused by inaccurate description of the high-frequency characteristics of the flyback converter, the small-signal model of the nonideal flyback converter operating in discontinuous conduction mode(DCM) is established by using the average switching model method, and the control loop transfer function containing high-frequency zero-poles is derived. Then the amplitude-frequency characteristics and phase-frequency characteristics of the control loop are analyzed, and the SIMPLIS simulation model and experimental prototype of the flyback converter based on the current mode control chip KP2201 are built for testing and verification. The simulation and experimental results show that the control loop based on the model prediction can effectively describe the operating characteristics of the system, the experimental results have good consistency in frequency response and dynamic response, which can provide a reference for designing stable systems in engineering applications.

Evaluation & Prediction Technology

GRA-TOPSIS Evaluation Model of Voltage Sag Risk Based on Game Theory Weighting

YI Xiaodong

2023, 0(8):  47-52.  doi:10.16628/j.cnki.2095-8188.2023.08.008

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Aiming at the problems that the existing sag evaluation index system has not been considered, the weighting method is not comprehensive and flexible, and the application of the sag risk evaluation method is not perfect, a GRA-TOPSIS evaluation model of voltage sag risk based on game theory weighting is proposed. First, the sensitive load failure rate model is established based on the normal distribution probability density function and the cumulative sum method. Then, a sag evaluation index system considering both the grid side and the user side is constructed, and the subjective and objective weight coefficients are integrated and combined using the game theory idea. According to the GRA-TOPSIS evaluation method, the node voltage sag risk evaluation calculation model is established. Finally, the results are verified by the measured data, which can prove the accuracy and practicability of the proposed method.

Industry Correlation Chart Model for Industry Chain Feature Mining and Industry Screening for Orderly Electricity Consumption

LUO Min, YANG Jingxu, ZHOU Shangli, LAI Yuchen, XIANG Rui, GUO Yangyun

2023, 0(8):  53-60.  doi:10.16628/j.cnki.2095-8188.2023.08.009

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In order to further explore the multi-dimensional value of industry electricity data and support the orderly electricity consumption plan arrangement of the power grid, an industry correlation chart model for industry chain feature mining and industry screening for orderly electricity consumption is proposed.Firstly, considering the time difference characteristics of production activities in the upstream and downstream industrial chains, an industry electricity correlation model is proposed.Secondly, an industry inward and outward electricity consumption characteristics assessment model and its characteristic development trend assessment method are proposed. And the industry sensitivity and the radiation intensity are proposed to quantify the influence of power demand between industries and the radiation intensity of each industry on social production.Subsequently, the industry correlation matrix and correlation chart are proposed to support the industry screening for orderly electricity consumption. Finally, it is verified by the examples that the proposed correlation chart model can effectively explore the industry chain characteristics of upstream and downstream association relationships of industries, and has great value in the industry screening of orderly electricity consumption.

Prediction of Storage Life of Aerospace Electromagnetic Relay Based on POA Optimization Support Vector Regression Model

ZHU Jiamiao, WANG Zhaobin, LI Jiuxin

2023, 0(8):  61-67.  doi:10.16628/j.cnki.2095-8188.2023.08.010

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To improve the prediction accuracy of the storage life of aerospace electromagnetic relays, a method based on the pelican optimization algorithm (POA) to optimize the support vector regression (SVR) model for the storage life prediction of aerospace electromagnetic relays is proposed. POA is utilized to optimize SVR model and solve the selection difficulty of kernel parameters in SVR model. Then the performance degradation data obtained from an accelerated degradation test of a certain type of relay is used to validate the proposed method. Finally, compared with the SVR method and SMA-SVR method, the average relative errors decreased by 24.82% and 3.69%, which proves that the proposed method can effectively enhance the prediction accuracy of the relays storage life.

Thermal Analysis and Temperature Prediction of 12 kV Switchgear Current-Carrying Loop

SHI Baopeng, HOU Chunguang, CAO Yundong, XU Xiaogang, JIANG Xingwei

2023, 0(8):  68-75.  doi:10.16628/j.cnki.2095-8188.2023.08.011

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Accurately mastering the thermal distribution and temperature rise of the current carrying circuit inside the switchgear under operating conditions can avoid the deterioration of insulation performance and reduction of service life under high temperature conditions. The thermal analysis and temperature prediction of a 12 kV switchgear current-carrying circuit are studied. Firstly, the temperature analysis model is established for the key heating parts of the cabinet and the main current-carrying loop. The simulation analysis of the model is carried out in combination with the heating theory of electrical appliances and the heat transfer theory. The results show that the temperature distribution of current-carrying loop is related to the contact resistance. Secondly, based on the simulation dataset, a temperature prediction model is constructed using the least squares support vector machine algorithm to predict the contact temperature. The results show that the prediction model had accuracy within an acceptable prediction error range.

Application

Analysis and Research on Key Component Characteristics of ACB Based on NX Motion Simulation

PAN Xuan, LI Tao, HOU Kui, LIU Fengfeng

2023, 0(8):  76-82.  doi:10.16628/j.cnki.2095-8188.2023.08.012

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Energy storage process, closing process and opening process of operating mechanism and contact system in series ACB products are simulated and studied based on Motion modular. Firstly, a three-dimensional model is established through UG. Using arrangement function, three initial states are built as the dynamic model of the three processes. Secondly, according to the actual motion relationship, the dynamic parameters are set up. Dynamic motion characteristics are got, including force value, time value, torque value and so on after solving. The influence of the main structural parameters of the operating mechanism and contact system on the motion characteristics is analyzed.According to analysis result, mechanism will not occur false closing, and closing time can be controlled in 10 ms.According to compare to test data, the correction of dynamic model and simulation results can be ensure. On this basis, the key parameters setting and matters needing attention during simulation process are summarized, which can supply responsible approach to optimal design and characteristics improvement.