• Title/Summary/Keyword: Electrical contact

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A Study on the Electrical Fire Risk of Terminal Block Due to Single and Composite Cause (단일 및 복합 원인에 의한 단자대 전기화재위험성에 관한 연구)

  • Kim, Si-Kuk;Gum, Dong-Shin;Lee, Chun-Ha
    • Fire Science and Engineering
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    • v.29 no.5
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    • pp.57-66
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    • 2015
  • This thesis is based on a research to investigate the electrical fire risk due to the single and composite cause in a terminal block. This paper analyzed the thermal characteristics depending on the screw torque change and contact resistance change to measure the fire risk due to the poor contact from single cause first. To measure the fire risk due to the composite cause, the acceleration tracking depending on the contact resistance change was experimented to check the correlation of poor contact and tracking to fire. The experiment result showed that the thermal characteristics were clearer as the screw torque in poor contact status and magnitude of contact resistance increased and that the thermal characteristics of terminal block depending on the contact resistance change was more reliable than the thermal characteristics depending on the screw torque change. Moreover, the terminal block poor contact and tracking were correlated in the case of the composite cause, and when two composite causes were interacted, the electrical fire risk was higher than the single cause.

Analysis of Communication Characteristics on Contact wire and Messenger wire of Electric Railroad for Power Line Communication (전기 철도의 전력선 통신을 위한 전차선과 조가선의 통신 특성 분석)

  • Lee, Hui-Jun;Ahn, Seung-Ho;Kang, Seung-Wook;Lee, Jong-Gu
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.10
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    • pp.157-162
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    • 2010
  • Power line communication, using 25[kV] high voltage of railway catenary, is to provide information which is real-time safety information for train operations and train workers in driving. Lots of noise were occupied in the contact wire by electrical and communication equipments. A signal attenuation was caused characteristics of the contact wire and messenger wire. For relaying communications to transmit information using the contact wire, catenary the noise and signal attenuation were investigated. And the final goal of the study was realized to transmit video information by power line communication on electric railway.

Effects of an Aluminum Contact on the Carrier Mobility and Threshold Voltage of Zinc Tin Oxide Transparent Thin Film Transistors

  • Ma, Tae-Young
    • Journal of Electrical Engineering and Technology
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    • v.9 no.2
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    • pp.609-614
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    • 2014
  • We fabricated amorphous zinc tin oxide (ZTO) transparent thin-film transistors (TTFTs). The effects of Al electrode on the mobility and threshold voltage of the ZTO TTFTs were investigated. It was found that the aluminum (Al)-ZTO contact decreased the mobility and increased the threshold voltage. Traps, originating from $AlO_x$, were assumed to be the cause of degradation. An indium tin oxide film was inserted between Al and ZTO as a buffer layer, forming an ohmic contact, which was revealed to improve the performance of ZTO TTFTs.

BCSC(Buired contact Solar cel1)의 제조를 위한 laser scribing Laser scrining for Buired contact Solar ell

  • 조은철;지일환;이수홍
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1995.05a
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    • pp.154-159
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    • 1995
  • To achieve a high aspect ration of metal contact, buried contact solar cell scribe the silicon surface using laser. The Q-switched NdLYAG laser which has 1.064$\mu\textrm{m}$ wavelength use for silicon scribing with 25~40$\mu\textrm{m}$ width and 20~200$\mu\textrm{m}$ depth capabilities. The 2~3% shading losses are very low campared to the screen printing solar cell. In this paper, we investigate the silicon scribing theory and pratice, scribing system for BCSC processing.

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Investigation on Contact Resistance of Amorphous Indium Gallium Zinc Oxide Thin Film Transistors with Various Electrodes by Transmission Line Method

  • Lee, Sang Yeol
    • Transactions on Electrical and Electronic Materials
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    • v.16 no.3
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    • pp.139-141
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    • 2015
  • Contact resistance of interface between the channel layers and various S/D electrodes was investigated by transmission line method. Different electrodes such as Ti/Au, a-IZO, and multilayer of a-IGZO/Ag/a-IGZO were compared in terms of contact resistance, using the transmission line model. The a-IGZO TFTs with a-IGZO/Ag/a-IGZO of S/D electrodes showed good performance and low contact resistance due to the homo-junction with channel layer.

A study on Analysis of Contact erosion at a Magnetic Contactor with the Use of Regression Analysis (회귀분석을 이용한 전자접촉기의 접점소모 분석에 대한 고찰)

  • Klm, Myoung-Seok;Ryu, Haeng-Su;Han, Gyu-Hwan
    • Proceedings of the KIEE Conference
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    • 2003.10b
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    • pp.116-118
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    • 2003
  • This paper describes a Accelerated Life Test (ALT) with the electrical contact erosion suitable to the evaluations of high-reliability and durability devices such as magnetic contactor. Recently, an electrical devices company was interested in accelerated life test (ALT), the product liability (PL) and the short-term testing model of electrical life test (ELT). In order to estimate a model for testing fee and period, need to the statistical analysis method with the acceleration factor(AF). Usually customer/manufacturer regard their device failure to the over-current or heavy duty condition, while devices view shape of contact erosion owing to operational duty problem. In this paper, additional method of evaluation estimated the operated cycles by weight of contact erosion with a used of regression analysis by MINITAB.

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Fabrication and Electrical Properties of Highly Organized Single-Walled Carbon Nanotube Networks for Electronic Device Applications

  • Kim, Young Lae
    • Journal of the Korean Ceramic Society
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    • v.54 no.1
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    • pp.66-69
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    • 2017
  • In this study, the fabrication and electrical properties of aligned single-walled carbon nanotube (SWCNT) networks using a template-based fluidic assembly process are presented. This complementary metal-oxide-semiconductor (CMOS)-friendly process allows the formation of highly aligned lateral nanotube networks on $SiO_2/Si$ substrates, which can be easily integrated onto existing Si-based structures. To measure outstanding electrical properties of organized SWCNT devices, interfacial contact resistance between organized SWCNT devices and Ti/Au electrodes needs to be improved since conventional lithographic cleaning procedures are insufficient for the complete removal of lithographic residues in SWCNT network devices. Using optimized purification steps and controlled developing time, the interfacial contact resistance between SWCNTs and contact electrodes of Ti/Au is reached below 2% of the overall resistance in two-probe SWCNT platform. This structure can withstand current densities ${\sim}10^7A{\cdot}cm^{-2}$, equivalent to copper at similar dimensions. Also failure current density improves with decreasing network width.

An Analysis on Electrical Property Measurement of Catenary System in Railway (철도 전차선로 전기적 특성 검측 기술 분석)

  • Park, Young;Cho, Yong-Hyeon;Jung, Ho-Sung;Lee, Ki-Won;Gwon, Sam-Yeong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.115-115
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    • 2010
  • This paper introduces a measurement system that measures behavior and electrical characteristics of overhead contact line irregular sections in real-time. For verification, we developed a prototype of the real-time overhead contact line irregular section behavior measurement system and a monitoring system for field tests. The current and temperature of contact wires and messenger wires were measured real-time by applying the system at KTX a commercial line. Therefore, acquiring data is possible with the developed system and this system that measures one of the fundamental and key factors, the catenary current, should be applicable to various areas such as detecting characteristics for designing overhead contact lines, enhancing speed, and enhancing energy.

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Stability of the Cable-in-Conduit Conductors (CIC 초전도 도체의 안정성)

  • 류경우
    • Electrical & Electronic Materials
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    • v.10 no.9
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    • pp.895-900
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    • 1997
  • A Quench in cable-in-conduit (CIC) conductors is often initiated by a disturbance such as strand motion that generates a highly localized normal zone in a strand or a few strands of the CIC conductors. The localized normal zone causes current and heat transfer between a disturbed strand and neighboring strands. Electrical and thermal contact characteristics between strands thus have an effect on the transient stability of the CIC conductors. In this paper the effect of contact characteristics between strands on the CIC conductor stability is presented based on the measured heat transfer characteristics of supercritical helium (SHe) for the local heating. The quench and recovery processes of the strands for the abrupt and highly localized disturbance are analyzed at the boundary between quench and recovery.

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Resistive displacement transducer enhanced measurement resolution by electrical line contact (선형 전기접촉으로 계측해상도가 향상된 저항성 변위센서)

  • Kim, Kyung-Ah;Choi, Seong-Su;Cha, Eun-Jong
    • Journal of Sensor Science and Technology
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    • v.16 no.4
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    • pp.263-269
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    • 2007
  • Although variable resistance displacement transducer is widely applied for its technical simplicity, electrical point contact limits measurement resolution (precision). The present study introduced roller shaped structure for electrical line contact. Proto-type transducer was developed and measurement characteristics were compared with a commercialized product. When the displacement was varied with steps of 5 mm, 1 mm, and down to 0.1 mm, the correlation coefficient between resistance and displacement decreased lower than 0.9 in the commercialized product while the proto-type transducer maintained values higher than 0.99. Therefore, the measurement resolution was enhanced by approximately 10 times. Since manufacturing also seemed easier, the present results would enable more accurate and less expensive manufacturing of variable resistance displacement transducer.