• Title/Summary/Keyword: connection apparatus

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Connection Apparatus using Coupling Device and Linking Method for Reinforcing Bar (철근연결구를 이용한 철근이음장치(LK-DK) 개발에 관한 연구)

  • Woo, Jong-Yeol;Hong, Seong-Wook;Park, Seung-Hwan;Ann, Tae-Han;Choe, Min-Kwon
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2012.05a
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    • pp.175-176
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    • 2012
  • In this study, coupler on the safety of meeting the requirements and construction and economy to satisfy the number of parts to minimize an LK-DK coupler has been developed, affordability existing reinforcing bar joint, welded joint, mechanical joints, compared with a favorable one to the understanding, and also facilitate the construction and logistics, etc. I've found that there is no additional pay because the amount of product performance through the tensile test after test, if commercialization is expected to be greater ramifications.

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Development of Response Time Measuring Apparatus for Fencing (펜싱 훈련용 반응시간 측정장치 개발)

  • Gil, Se-gi;Lee, Sang Cheol;Hwang, Jong-Hak;Kim, Tae-Wan;Jung, Jin-Uk;Lee, Hyo-Geun;Han, Yeong-Hwan
    • Journal of rehabilitation welfare engineering & assistive technology
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    • v.10 no.4
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    • pp.315-320
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    • 2016
  • In this study, we developed a response time measuring apparatus for fencing which can use fencing athlete's own electric sword and connectors. The measuring apparatus designed to be connected to upper back of dummy body and it's position can be changed by spinning itself. And it operates like a closed circuit composed of dummy helmet, the apparatus, reel signal connection, connector and electric sword of athlete. This measuring apparatus can provide response time to athlete immediately which response time is measured from the time of indicating random signal of light and sound to the time of attacking dummy by athlete. we carried out pilot test for couch and athlete of national fencing team and could validate availability of this system.

CHAOTIC ANALYSIS OF PARTIAL DISCHARGE (CAPD) AS A NOVEL APPROACH TO INVESTIGATE INSULATION DEGRADATION CAUSED BY THE VARIOUS DEFECTS (다양한 결함으로부터 발생되는 절연열화를 검출하기 위한 새로운 접근기법으로써의 카오스 분석)

  • Kim, Sung-Hong;Park, Jae-Jun;Lim, Yun-Sok;Yun, Jeung-Hoon;Koo, Ja-Yoon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.05c
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    • pp.221-224
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    • 2001
  • In connection with the monitoring of insulation degradation of large power apparatus in order to predict their unexpected service failures, a statistical treatment, such as phase resolved partial discharge analysis(PRPDA), has been established for the on-line monitoring system during the past decades. However, this method has shown some inconveniences to distinguish the nature of the PD source in power apparatus. In this regard, a novel approach based on the chaotic analysis(CAPD) is proposed describing the fundamental ideas, outcomes and different view points from conventional PRPDA. In order to make a model for the possible defects causing sudden failures in service, several types of specimen were prepared. And partial discharge signals, originated from those samples, were measured and analysed by means of PRPDA and CAPD respectively. Throughout this paper, it seems that the correlation between the consecutive PD pulses depending on the nature of PD could be investigated by CAPD. Therefore, it could be considered that the nature of PD source can be distinguished more distinctively when the PRPDA is combined with CAPD.

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Chaotic Analysis of Partial Discharge (CAPD) - A novel approach to identify the nature of PD source (Chaos 이론을 이용한 부분방전 신호분석(CAPD) - 결함 종류 판별을 위한 새로운 접근 방법)

  • 임윤석;구자윤;김성홍;이전선;최재옥;윤정훈;마지훈
    • Proceedings of the IEEK Conference
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    • 2001.09a
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    • pp.975-979
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    • 2001
  • In connection with the monitoring of the insulation degradation of large power apparatus in order to predict their expected service failures, a statistical treatment, such as phase resolved partial discharge analysis (PRPDA), has been established for the on-line monitoring system during the past decades. However, this method has shown some inconveniences to identify the nature of the PD source in power apparatus. In this regard, a novel approach based on the chaotic analysis (CAPD) is proposed describing the fundamental ideas, outcomes and different viewpoints from the conventional PRPDA. As a model for the possible defects causing sudden failures in service, three types of specimen are prepared. And partial discharge signals, originated from those samples, are measured and analyzed by means of CAPD. Throughout this work, it seems that the correlation between the consecutive PD pulses, depending on the nature of PD, could be clarified by CAPD. Thereffre, it could be considered that the nature of PD source can be identified more distinctively when the CAPD is combined with PRPDA.

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A Solution to Large Strain Resonant Column and Torsional Shear Tests Apparatus (대변형율 시험을 위한 공진주/비틂전단 시험기의 해결방안)

  • Bae, Yoon-Shin
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.31 no.3C
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    • pp.103-108
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    • 2011
  • In this study, the limitations of large strain resonant column and torsional shear tests apparatus are described and solutions to the limitations are also described. The limitations are rotational distance, limited torque, and measurable deformation system, respectively. To resolve the rotational distance, the bottom platen was modified. And the four-armed drive plate was modified into eight-armed drive plate and the drive coil connection was changed to obtain powerful torque.

A Study on Bonded Joints of Composite Hollow Bushing (Composite Hollow Bushing의 접합기술에 관한 연구)

  • Cho, Han-Goo;Kang, Hyung-Kyung;Yoo, Dea-Hoon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.06a
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    • pp.493-494
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    • 2008
  • During the last years hollow core insulators started their success story in the field of high voltage engineering for electrical apparatus, substituting porcelain insulators. The termination, also named top and bottom fittings are used for the connection to the rest of the electrical apparatus. The top and bottom flange are attached to the composite to transmit mechanical load and also ensure the gas tightness. They are bonded by epoxy glue with a glass transition temperature of about $130^{\circ}C$-$150^{\circ}C$ the glass reinforced epoxy tube of filament winding. This paper describes the results of a study on the bonded joints of fiber reinforced epoxy tube and cast aluminum. This suggests that surface roughness and glue types play an important role in evaluating of gas sealing capability on the flange and fiber reinforced epoxy tube in the composite hollow bushing.

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Performance and Design of Cable Termination for 154kV Class (154kV 케이블 콘넥터의 설계와 특성 평가 연구)

  • Cho, Han-Goo;Kim, Kyang-Young;Lee, Cheol-Ho;Lee, Yong-Sun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.112-112
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    • 2010
  • The purpose of development is to localize a connector for connection of cable and GIS for underground transmission system. The cable connector for GIS provides electrical insulation of GIS housing part and makes connection of ultra high voltage electrical apparatus and power cable by controlling electrical stress between electrodes of power cable termination. Generally Korean switchgear makers are using a connector for GIS made by foreign companies. We manufactured sample by best structure design of great capacity conductor connecting part and then modified the design by analysis of shape and section. We completed the suitable sample for current cycling test condition of conductor connecting part sample and ensured surge characteristics of line by short-time current test.

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Ferroelastic Domain and Refractive Property of $Gd_{2}(MoO_{4})_{3}$ Single Crystal ($Gd_{2}(MoO_{4})_{3}$ 단결정의 강탄성구역과 굴절률특성)

  • Son, Jong-Yoon;Lee, Chan-Ku;Lee, Su-Dae;Kim, Jae-Hyung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.05b
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    • pp.98-102
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    • 2002
  • We investigated domains and conoscope under the polarizing microscope and the index of refraction on the c-plate GMO which has the ferroelectric and ferroelastic phase at room temperature. To observed the change of refractive index in connection with domain, we developed an apparatus to obtain the refractive index by measuring the Brewster's angle. The resolution of the minimum rotation angle of this apparatus is $0.001^{\circ}$. To obtain the refractive index map on the sample, the moving distance of XY stage loaded sample holder is 60 mm and the minimum moving distance is 0.002 mm. Also, To obtain the indicatrix for single crystal, vertical turntable with sample holder and XY stage was loading on horizontal turntable. The minimum resolution angle of this vertical turntable is $0.001^{\circ}$. We measured the refractive index of transparent materials such as ferroelectrics. In the case of $Gd_{2}(MoO_{4})_{3}$, the Brewster angle is $62.11^{\circ}$ and then, the refractive index is 1.8895 by using He-Ne Laser. Also the refractive distribution of c-plate GMO was obtained with $400{\mu}m{\times}120{\mu}m$.

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A POSSIBLE APPLICATION OF CHAOTIC ANALYSIS FOR THE INVESTIGATE OF THE INSULATION DEGRADATION CAUSED BY THE VARIOUS DEFECTS (다양한 절연열화 분석을 위한 카오스 분석방법 적용 연구)

  • Yun, Jeung-Hoon;Lim, Yun-Sok;Koo, Ja-Yoon
    • Proceedings of the KIEE Conference
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    • 2001.07c
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    • pp.1606-1608
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    • 2001
  • In connection with the monitoring of the insulation degradation of the large power apparatus, a statistical treatment, such as phase resolved partial discharge analysis (PRPDA) has been established for the on-line monitoring system during the past two decades. However, it has shown some inconveniences to distinguish the nature of the PD source in power apparatus. In this regard, a novel approach based on the chaotic analysis(CAPD) is proposed describing the fundamental ideas, outcomes and different view points from conventional PRPDA. In order to make a model for the possible defects causing sudden failures in service, several types of specimen were prepared. And partial discharge signals, originated from those samples, were measured and analyzed by means of PRPDA and CAPD respectively. In this paper, it seems that the correlation between the consecutive PD pulses depending on the nature of PD could be investigated by CAPD. Therefore, it could be considered that the nature of PD source can be distinguished more distinctively when the PRPDA is combined with CAPD.

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Fault Diagnosis Device for Fire Prevention of the Resistance Heating Type three-Phase Electric Heater (3상 저항가열식 전기히터의 화재예방을 위한 결함 진단장치)

  • Lee, Mun-Hyung;Kim, Chan-O
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.11
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    • pp.1669-1674
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    • 2017
  • In this study, We have discussed the development of a diagnostic device to detect and prevent electrical fire due to the arc caused by contact failure and partial disconnection at the connection part of the three-phase electric heater wiring used in the industrial field. The arc caused by contact failure and partial disconnection at the connection part of the electric heater shows a change in the current effective value. Therefore, it is possible to determine whether there exists a defect by analyzing the current unbalance factor and the number of current fluctuations with the diagnostic apparatus. The three-phase unbalanced heater is considered to be capable of determining defects through periodic measurement and trend analysis of the current unbalance factor. It is also expected that this device can be used not only for electric heaters but also for detection of defects in wiring and connections of electrical equipment having a characteristic of constant load current.