Table of Content

28 February 2021, Volume 0 Issue 2

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Overview

Overview of Structure Innovation and Intelligent Control Technology of AC Contactor

ZHOU Yuyuan, LIU Xiangjun

2021, 0(2):  1-7.  doi:10.16628/j.cnki.2095-8188.2021.02.001

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AC contactor is one of the important control appliances to ensure the safe and stable operation of power distribution system and low voltage control system.Improving the working performance and economic indicators of AC contactors to meet the increasing market demand has become an important research direction.In this paper,the research status of AC contactor at home and abroad is summarized.Based on the structure and working performance of AC contactor,the new technology and research scheme are summarized in terms of structure optimization,structure innovation and intellectualization,and its principle and application are illustrated in detail.Finally,the future development trend of AC contactor is prospected.

Research & Analysis

Discussion on Static Conductor Technology of MCCB from Patent

QUAN Jiaqing

2021, 0(2):  8-13.  doi:10.16628/j.cnki.2095-8188.2021.02.002

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The static conductor plays an important role in the performance of MCCB.This paper lists the typical patents of the static conductor of MCCB and did a brief analysis.In addition,a new technical scheme of static conductor was proposed,which can provide reference for the researchers.

Analysis of Electromagnetic Characteristics of AC Contactor

GUO Shucai, MA Yanshen, WANG Xilian

2021, 0(2):  14-18.  doi:10.16628/j.cnki.2095-8188.2021.02.003

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AC contactors are widely used in the field of rail transit and railways.The main contacts of the contactors are frequently closed,resulting in that their electrical life is often lower than the mechanical life.Effectively analyzing the electromagnetic characteristics of the contactor under different working conditions is the premise of its failure analysis and life prediction.The voltage of the coil controlled by the contactor has a great influence on its working performance.Based on the finite element software,a simulation model of electromagnetic characteristics was established and analyzed.The influence of the coil pull-in phase angle and voltage amplitude on the electromagnetic performance of the contactor was given.Combined with ADAMS software co-simulation,the dynamic characteristics of impact force and penetration depth are analyzed,and the analysis results of the vibration phenomenon of the contact of the contactor are given.The simulation and result analysis in this paper provide a basis for the analysis of the contactor failure cause.

Metal Droplet Evaporation in Post-Arc Breakdown Process of Aviation Variable Frequency Vacuum Arc

JIANG Yuan, MA Li, WU Jianwen, QUAN Wei

2021, 0(2):  19-24.  doi:10.16628/j.cnki.2095-8188.2021.02.004

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In order to understand the post-arc breakdown mechanism of the aviation variable frequency vacuum arc,the experimental and simulation research is carried out.The results show that there are a large number of metal droplets in the vacuum chamber during the post-arc breakdown process for the intermediate frequency vacuum arc.The droplets are moving sources of metal vapor and the life of the metal droplet is 1.6~2.8 ms.During this period,especially the first 100 μs of evaporation,the metal vapor will affect the recovery of the post-arc dielectric.The factors which determine the life of the metal droplet are the droplet radius,jet movement speed and the size of the vacuum chamber.The distribution of the vapor decreases gradually from the center of the droplet.More than 80% of the vapor is distributed within a radius of 10 times.The post-arc metal vapor reduces the recovery strength of the dielectric.When the recovery voltage applied to contact is greater than the critical value,post-arc breakdown will occur.

Extraction of SSPC Parasitic Parameters Based on Product Structure and Simulation Analysis of Resistive Load Switching Characteristics

WANG Haonan, LAI Yaokang, ZHANG Hongyu, CAO Yufeng, YE Xuerong, ZHAI Guofu

2021, 0(2):  25-30.  doi:10.16628/j.cnki.2095-8188.2021.02.005

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With the development of electric aircraft,the solid-state power controller(SSPC)composed of SiC devices has gradually become a hotspot at home and abroad.Due to the complex structure of SSPC and the need for frequent debugging,accurate simulation models can provide great help for product design.This article mainly used software such as Ansys Q3D Extractor to extract the parasitic parameters based on the product structure of the SSPC composed of the third generation CREE SiC MOSFET,and established the SSPC single-channel and overall electrical equivalent models.The characteristics of SSPC’s resistive load switching were analyzed and it was found that there is no obvious oscillation in the waveform.Finally,it was concluded that the influence of parasitic parameters can be ignored.

Industry Analysis Method of Substation Integrated Load Based on Dynamic Time Warping

YANG Jun, HUANG Jiyuan, HU Xiangwei, LI Rensheng, WU Donglin, ZENG Linjun

2021, 0(2):  31-36.  doi:10.16628/j.cnki.2095-8188.2021.02.006

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The low accuracy of the similarity measurement method used by the traditional clustering algorithm,results in the low quality of the clustering algorithm and the low fitting degree of the comprehensive load daily load curve in the analysis process of the integrated load industry of the substation.Time-regulated analysis method of substation comprehensive load industry is proposed.Perform the K-means clustering algorithm based on dynamic time normalization on the daily load curve set,and extract the cluster center curve reflecting the industry load characteristics.Based on the dynamic time normalization,the comprehensive load daily load curve of the substation is simulated according to the cluster center curve.Together,complete the analysis of the composition ratio of the substation industry.The results show that:the clustering center and substation industry composition ratio obtained by the method is consistent with the actual situation,and the clustering quality and accuracy of fitting the comprehensive load curve of the substation are better than the traditional method.

Electrical Design & Discussion

Research on Calculation and Analysis of Impact Bounce Time of Closing Contact of Vacuum Contactor

CUI Aiqiang

2021, 0(2):  37-40.  doi:10.16628/j.cnki.2095-8188.2021.02.007

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In this paper,the ideal mathematical calculation model of the impact bouncing time is established,based on the dynamic analysis of the impact bouncing process of the moving contact of the closing vacuum contactor.According to the design and test data,the maximum impact bouncing time is calculated and compared,which verifies the validity and accuracy of the theoretical model.The influence of the change of relevant independent variables to the impact bouncing time is analysed quantitatively.

Optimal Design of Making and Breaking Capacity of PC Level ATSE with Economical Small Volume and Single Cavity

LIU Jinmiao, LIU Hui, BAO Xiaozhong, GAO Boyong, ZHENG Haojing

2021, 0(2):  41-44.  doi:10.16628/j.cnki.2095-8188.2021.02.008

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The PC-grade ATSE refers to the economical one,with common contacts and spare contacts in a cavity.It operates by the mechanism,that can quickly disconnect and connect,to effectively reduce the contact resistance on the moving and static contacts by driving the rotating shaft through the energy storage structure.The arcing grid piece of it can effectively control the voltaic arcs.Through experiments and trials,the I-type static contact is changed to the Y-type one to improve the performance index of making and breaking capacity.In the meanwhile,the ATSE contact system adopts the freely assembled design of pole numbers,which is convenient to install.This paper introduced the structure principles of the product and detailed the optimization of its operating mechanism.

Analysis on Typical Small Load Electrical Characteristics of Intelligent Miniature Circuit Breaker

ZHAO Jie, ZHOU Zhipeng, CHU Xiaofeng

2021, 0(2):  45-47.  doi:10.16628/j.cnki.2095-8188.2021.02.009

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As a voltage and current measurement and control protection device,intelligent miniature circuit breaker has been widely used in low voltage clients.With the diversity and complexity of load,whether the traditional single RMS value calculation method can not meet the requirements of electrical characteristics analysis and power quality precision management.This paper measured the data of several typical small load,and based on the measured data analized the effective value and harmonic calculation,summarized the typical electrical characteristics of small load,which can improve the intelligent measurement analysis and calculation precision of the miniature circuit breaker and promote the power quality precision management under the diversified small load characteristic.

Detection & Experiment

Design of Novel Electrical Endurance Experimental System for AC Contactor

WANG Tianyang, ZHENG Zhe, ZHANG Xu, REN Wanbin

2021, 0(2):  48-53.  doi:10.16628/j.cnki.2095-8188.2021.02.010

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The accuracy of assessment in switching load capacity and reliability of AC contactor greatly depends on the electrical lifetime test method and system.Considering the optimization of contact materials,this paper introduced a novel electrical endurance experimental system for AC contactor,which is able to monitor the operating characteristic parameters of contactor.Moreover,the contact gap and magnetic gap can be flexibly adjusted.The system was used in analyzing the influence of contact gap on the operating characteristics,and the variations in electrical performance parameters.

Research on Short-Time and Peak Withstand Current Test of High Voltage Apparatus in Short Circuit Test System of Low Voltage Apparatus

LI He, YUAN Yuan, JIANG Ning

2021, 0(2):  54-59.  doi:10.16628/j.cnki.2095-8188.2021.02.011

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Short-time withstand current test and peak withstand current test is an important test to check the electrical performance.With the increasing capacity of short circuit test system of low voltage apparatus,some tests of high voltage apparatus can be carried out.In this paper,the short-time withstand current test and peak withstand current test of high voltage apparatus based on the short circuit test system of low voltage apparatus is taken as the research object,and the calculation and test methods are proposed from the perspective of current debugging,including setting current effective value and current peak value.The method can be applied to the short-time withstand current test and peak withstand current test of high voltage apparatus in the short circuit test system of low voltage apparatus,and provide reference for personnel.

Magnetic Holding Relay Static Suction Reaction Force Characteristic Testing Device

LIANG Huimin, ZHU Xuqing, LI Donghui, TIAN Cong

2021, 0(2):  60-64.  doi:10.16628/j.cnki.2095-8188.2021.02.012

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Aiming at the problem that the current existing device for testing the suction force of the relay cannot accurately measure the suction force of the magnetic holding relay near the steady state position,a suction force measurement scheme near the steady state position based on the double dial is proposed.Combined with the specific structure and parameters of a certain type of miniature magnetic holding relay,the mechanical structure design and electronic control system design of the static suction reaction force characteristic device were designed,and the control software was compiled to achieve the accurate measuring of the suction force and the resultant force corresponding to the different action positions of the relay.The test results show that the magnetic holding relay static attraction reaction characteristic test device developed in this paper solves the problem that the original equipment cannot measure the suction force near the steady state position.This equipment is designed for technical personnel to improve the magnetic holding relay products.Manufacturing process quality control laid the foundation for testing.

Distributed Generation and Grid-Connection Technology

Coordinated Optimization for Day-Ahead and Intra-Day Opertation of Island Micro-Grid Considering Energy Storage

KONG Yukai, WEN Buying, ZHU Zhenshan, TANG Yuchen

2021, 0(2):  65-74.  doi:10.16628/j.cnki.2095-8188.2021.02.013

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The islanded micro-grid system has no support from the main grid and only relies on internal micro-sources to feed itself.Therefore,it is of great significance to develop a reasonable operation scheme for islanded micro-grid to operate safely and economically.Considering the different roles of the energy storage system in the operation of the micro-grid,the multi-objective optimal operation model of micro-grid was established with the optimization objectives regarding economy,reliability,energy utilization efficiency,peak-valley difference,and fluctuation of equivalent load.Based on the forecast of wind power,photovoltaic power,and load,the model optimizes the operation of micro-grid at both day-ahead and within-day scales.The day-ahead optimization scheme is taken as a reference for withim-day optimization scheme and can be revised if necessary.The model is transformed into a single objective optimization problem by using fuzzy theory and binary contrast weighting method.The mixed integer programming model is solved by CPLEX software to obtain optimal scheme for the operation of the islanded micro-grid.The model can improve the reliability and efficiency of micro-grid.Simulation analysis is conducted to verify the operation scheme proposed in this paper.

Design of Wide Input Voltage DC-DC Convertor Device for Airborne

FU Peng, ZHANG Henghao, YIN Hua

2021, 0(2):  75-80.  doi:10.16628/j.cnki.2095-8188.2021.02.014

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This article introduced a DC-DC convertor based on surface mounted technology process.The convertor adopts the fly-back topology and synchronizer rectifier,it has many functions such as small size,wide input voltage,high efficiency,over current protected and so on.And it can satisfy the power supply of 28 V bus which prescribed by GJB 181B—2012,so the convertor can be used in the intricate condition of airborne.

Modulation Method for Reducing Current Zero-Crossing Distortion of VIENNA Rectifier

ZHANG Qingyan, WANG Peidong, HUANG Xinmei, WANG Juncan, GUI Zaiyi, ZHANG Wei

2021, 0(2):  81-87.  doi:10.16628/j.cnki.2095-8188.2021.02.015

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The inherent problem of the VIENNA rectifier is that distortion may occur at the current zero crossing point.To solve this problem,a modulation method that can minimize the current zero-crossing distortion is proposed.Firstly,according to the control method of the VIENNA rectifier,the principle of current zero-crossing distortion is analyzed.Then,a function to quantify the actual output voltage deviation of the rectifier is proposed.And the minimum distortion of the actual output voltage at the current zero-crossing point is achieved.Finally,the feasibility and superiority of the modulation method proposed in this paper are verified by experiments.

Zero Ripple High-Gain DC/DC Converter with Coupled Inductor

HONG Jianchao, LIN Guoqing

2021, 0(2):  88-93.  doi:10.16628/j.cnki.2095-8188.2021.02.016

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For the problem of large input current ripple of boost DC/DC converter in new energy power generation system,a zero ripple high gain DC/DC converter with coupled inductor was proposed.The converter,based on the boost converter,introduces coupled inductor and diode capacitor boost unit to improve the voltage gain.At the same time,the input current ripple achieves zero in theory,which is beneficial to improve the efficiency of power generation.The operational principle of the converter and its steady-state characteristics were analyzed in detail.Finally,a 100W prototype was built to verify the zero input current ripple of the converter and high-gain characteristics.