• Title/Summary/Keyword: Electric contact type switch

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Hybrid LVDC Circuit Breakers (저압직류용 하이브리드 차단기)

  • Hyo-Sung, Kim
    • The Transactions of the Korean Institute of Power Electronics
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    • v.27 no.6
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    • pp.489-497
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    • 2022
  • This work investigates the commutation characteristics of the current flowing through an electrical-contact-type switch to the semiconductor switch branch during the breaking operation of hybrid DC switchgear. A simple, reliable, low-cost natural commutation method is proposed, and the current commutation characteristics are analyzed in accordance with the conduction voltage drop of the semiconductor switch branch through experiments. A prototype 400 V/10 A class natural commutation type hybrid DC switchgear is set up. Its performance is verified, and its characteristics are analyzed.

A Modeling of Impact Dynamics and its Application to Impact Force Prediction

  • Ahn Kil-Young;Ryu Bong-Jo
    • Journal of Mechanical Science and Technology
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    • v.19 no.spc1
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    • pp.422-428
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    • 2005
  • In this paper, the contact force between two colliding bodies is modeled by using Hertz's force-displacement law and nonlinear damping function. In order to verify the appropriateness of the proposed contact force model, the drop type impact test is carried out for different impact velocities and different materials of the impacting body, such as rubber, plastic and steel. In the drop type impact experiment, six photo interrupters in series close to the collision location are installed to measure the velocity before impact more accurately. The characteristics of contact force model are investigated through experiments. The parameters of the contact force model are estimated using the optimization technique. Finally the estimated parameters are used to predict the impact force between two colliding bodies in opening action of the magnetic contactor, a kind of switch mechanism for switching electric circuits.

Analogue type Starter of Single Phase Induction Motor Removing Noise and Arc (소음과 불꽃을 제거한 단상유도전동기의 아날로그식 기동기 설계)

  • Park Su-Kang;Cho Geum-Bae;Baek Hyung-Lae;Lim Yang-Su;Lee Sung-Kil;Lim Jong-Yeun
    • Proceedings of the KIPE Conference
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    • 2001.07a
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    • pp.654-656
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    • 2001
  • This research used triac that is semi-conductor that act to static contact to overcome happened shortcoming been using mechanical centrifugal force switch usually Detect starting current of single phase induction motor and decided moving time. Therefore, could improve life of switch semipermanently. Also, wish to reduced impact that electric motor suffers at the starting moment and do stable starting which there is no life improvement and noise of electric motor itself, arc.

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Development of Electronic Limit Switch for the Drive Unit of Incore Detector System Application (노내 핵계측 계통 구동기기의 전자식 한계스위치 개발)

  • 박종범;양승권;이상효
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.14 no.4
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    • pp.1-7
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    • 2000
  • In this paper, we study a cause of malfunction of switch to control drive motor in DFMS(Digital Flux Mapping System) which can measure incore neutron flux of the nuclear plant, and develope a method to solve this problem. DFMS has the type of generating contact signal by mechanical switch lever, which is operated whenever thimble detector inserted or withdrawed through thimble Guide Tube. However the characteristics of the lever tend to be changed by mechanical degrade or bad environment and the lever finally generates errotic contact signal. Therefore we installed electric coil ass'yin the outside of Guide Tube instead of mechanical switch assy's. In addition we applied resonance effect to control circuit and installed condenser in the input of power supply to protect noise and interference. After completion of this improvement, we tested this improved device repetitively under the various conditions. In conclusion, we identified the generation of the desired contact signal and the prevention of detector failure through plant surveillance test during normal plant operation.

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The Structural Design of the Bus-bar block type of electrical switch boards (전기분전반용 블록형 부스 바의 구조 설계 연구)

  • Kwon, Young-min;Hwang, Chang-yu;Kim, Kyun-ho;Han, Hee
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.2
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    • pp.378-385
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    • 2016
  • The internal circuit of the bus-bar for an electrical switch board is a prime cause of electric shock and short circuit accidents due to the exposure of live parts. Electrical fires can also be caused by animals and foreign substances in the switchboard that connect the components with a difficult structure resulting in overheating due to an increase in contact resistance. Preventing these types of accidents is a prime concern in the manufacturing process, such as cutting and bending. In this study, the cutting bus bar of a switch board contained improved modules as a flame retardant that isolates a separate blocks to prevent such problems. This was implemented as a scalable and flexible means of reducing electrical switchboard hazards to offer a safe switch board bus-bar structure of a new connecter type

A Study on the Shift Motor Driving System Optimization of 4-WD Power Transformation Device (4-WD 동력전환장치의 변속 모터 구동부 최적화에 관한 연구)

  • Youm, Kwang Wook;Ham, Seong Hun;Oh, Se Hoon
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.11
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    • pp.1187-1192
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    • 2013
  • In the case of 4 wheel drive (4-WD) type car, power switching occurs to 4-WD by operating lever or switch that operates power switching device attached in transfer case which can operate motor by electric signal. So if the RPM of motor is high, power switching will not exactly occur and can cause damage to gear in transfer case according to circumstances. So in this study, we applied 2 level of planet gear type motor spindle of motor drive part of a power train. And conducted decelerating to increase torque to switch power safe and accurately. Also, we researched efficiency of gear by designing reduction gear ratio and gear type and by calculating contact stress and bending strength. Based on researched content, we made drive head of power switching device and a reduction module which uses type that uses motor spindle as sun gear and ring gear as cover.

760 V-Class DC Switch Breaking Characteristics Using Tandem Type Magnet Extinguisher (탠덤형 자석 소호기를 사용한 760V급 직류 개폐기의 차단 특성)

  • Kim, Hyosung
    • The Transactions of the Korean Institute of Power Electronics
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    • v.27 no.3
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    • pp.175-179
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    • 2022
  • Magnetic arc extinguishing technology is effective as an extinguishing device for low-voltage direct current (DC) circuit breakers with a resistive load of ≤4 kW. The separation distance between the magnet and the electrical contact must be shortened to increase the magnetic arc extinguishing force. However, if the magnet is installed too close to the electrical contact points, the magnet is exposed to high temperatures due to the arc current generated when the load current is cut off and the magnetism is lost. To solve this problem, the effective magnetic flux density at the electrical contact can be maintained high by placing the arc extinguishing magnet in a tandem structure with the electrical contact point between them, and the proper separation distance between the contact points and the magnet can be maintained. In addition, an electric arc extinguishing technology that emits arc energy using a series circuit of diode and resistor is used to suppress the continuous arc voltage generated by the inductive load. For the proposed circuit breaker, the breaking characteristics are analyzed through the breaking test for the DC load of the 760 V level, the load power of 4 kW, and the time constant of 5 ms, and an appropriate arc extinguishing design guideline is proposed.

An Experimental Study on the Fire Risk of Electric Heaters According to Contact of Flammable Materials (가연물 접촉에 따른 전기히터의 화재위험성에 관한 실험적 연구)

  • Lee, Sung-Ryong
    • Fire Science and Engineering
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    • v.25 no.3
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    • pp.63-71
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    • 2011
  • In this study, it was evaluated the fire risk of an electric heater as representative seasonal appliances. Two type of electric heaters were used in experiments. When electric heaters were operated, temperature variation was measured around the heater. Internal structure was understood by Nondestructive inspection. It was evaluated the tire risk of electric heaters, when flammable materials were positioned ear a heater. It was also estimated the probability of a tire in case of malfunction of a safety tip-over witch. When a heater was operated in a normal condition, temperature was maintained under $80^{\circ}C$ around the heater. The possibility of a fire is very high, when a heater is covered with flammable materials or malfunction of safety parts (safety tip-over switch, anti-overheating devices).

Development of Shift-By-Wire System for an Automatic Transmission Equipped Vehicle (자동변속기장착 차량의 Shift-By-Wire 시스템 개발)

  • Kim, Jung-Yun;Yim, Chung-Hyuk;Lim, Won-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.4
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    • pp.41-46
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    • 2007
  • This article deals with the design and prototyping of Shift-By-Wire system for an automatic transmission equipped vehicle. In order to manipulate the shifting action electronically, Shift-By-Wire system consists of an electronic shift lever, an electric shift actuator and position sensors. The shift lever is designed to transform the driver's shifting command into an electric signal; it includes the position sensor using non-contact type hall sensor and an additional shifting switch acting as Tip-tronic. For the design of an electric shifting actuator, we investigated the stroke angles and shifting efforts of the manual control lever in each shifting section. And the position sensor of the shifting actuator is designed by using a potentiometer with an optical encoder. Finally the prototype of Shift-By-Wire system was built in a conventional 2.4L class SUV vehicle, and we performed road tests in order to verify its performance.

Development of Smart ICT-Type Electronic External Short Circuit Tester for Secondary Batteries for Electric Vehicles (전기자동차용 2차전지를 위한 스마트 ICT형 전자식 외부 단락시험기 개발)

  • Jung, Tae-Uk;Shin, Byung-Chul
    • Journal of the Korean Society of Industry Convergence
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    • v.25 no.3
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    • pp.333-340
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    • 2022
  • Recently, the use of large-capacity secondary batteries for electric vehicles is rapidly increasing, and accordingly, the demand for technologies and equipment for battery reliability evaluation is increasing significantly. The existing short circuit test equipment for evaluating the stability of the existing secondary battery consists of relays, MCs, and switches, so when a large current is energized during a short circuit, contact fusion failures occur frequently, resulting in high equipment maintenance and repair costs. There was a disadvantage that repeated testing was impossible. In this paper, we developed an electronic short circuit test device that realizes stable switching operation when a large-capacity power semiconductor switch is energized with a large current, and applied smart ICT technology to this electronic short circuit stability test system to achieve high speed and high precision through communication with the master. It is expected that the inspection history management system based on data measurement, database format and user interface will be utilized as essential inspection process equipment.