• Title/Summary/Keyword: Section insulator

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Insulation Deterioration of AC/DC Section Insulators for Electric Railroad Catenary. (전기철도 교/직 절연구분장치의 절연열화 현상)

  • 최규형
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.1
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    • pp.16-22
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    • 2003
  • While passing through the AC/DC section insulators installed at electric railroad catenary, some electric trains undergo mis-operation of main circuit breaker after AC/DC change-over operation. This paper provides insulation resistance measurements of AC/DC section insulators, which confirm the insulation levels of section insulators are below the standard of insulators. The insulation deterioration and pantograph arrangement on the electric train can produce voltage impression on section insulator which induces mis-operation of main circuit breaker To mitigate the insulation deterioration of the section insulator installed at underground railroads, the section insulators have been cleaned periodically, but section insulator structure should be modified to make the section insulator performance perfect. Based on the above analysis, effective modification method of AC/DC section insulator is provided.

Development of Section Insulator with Improved Wear Characteristics (내마모성이 우수한 절연구분장치 국산화 개발)

  • Lee, Kiwon;Jung, Hosung;Park, Young;Cho, Ho Ryung;Lee, Sang Sik
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.11
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    • pp.1633-1639
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    • 2013
  • In a section of AC electric railway, a phase between the sections is different although voltage levels supplied from substations are the same. Therefore, section insulators have been installed to electrically divide between the sections. Two differenet types of section insulator, namely an overlap type and insulator type, are used. In Korean high-speed lines, overlap type section insulator has been adopted. And, insulator type is used in conventional line. The overlap type has the advantage of having no speed limit, but has the disadvantage of requiring long section length. However, the insulator type has the advantage of section length, but also has the disadvantage of having speed limit. In Korean conventional line, an insulator type one relies on the import and there is some problem with wear. In this study, we developed the insulator type section insulator which adopts Teflon tube insulation material. The Teflon material has advantage of the excellent electrical characteristics and wear-resistance characteristics for a longer expected life than that made of existing FRP. In order to compare wear characteristics between the materials, wear tests with reciprocal wear tester are performed. And dynamic behavior tests between the insulators and pantograph are also performed for showing its better dynamic characteristics.

Analysis of Breaking Accident of FRP Insulator Rod installed in Dead Section (절연구간 조가선 FRP 절연봉의 절단사고 원인분석)

  • Jang, Don-Guk;Lee, Ki-Won;Kim, Ju-Rak;Park, Hyun-June
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.07a
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    • pp.502-505
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    • 2003
  • The accidnet of breaking insulator rod leads to inturruption of moving the subway. We investigate the analysis of analysis of breaking accident of FRP insulator rod installed in dead section for catenary feeding system. To analysis of accident reason, SEM is used to analysis microscopic struture on surface of cross section of broken FRP insulator rod. At the same time, we examine the chage of atomic amount on solace of accident insulator through EDX analysis. Also, the test for tensional breaking load is condoled to check the mechanical strength.

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Countermeasures to Irregulor Abrasion of Section Insulators for Electric Railroad Catenary (전차선 절연구분장치 절연재의 이상마모 대책)

  • 최규형
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.16 no.6
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    • pp.87-94
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    • 2002
  • As a section insulator dividing the electric railroad catenaries with different phases, the AC/DC section insulator which divides AC and DC railroad catenary have the complex structure, and suffer irregular abrasion on the surface or insulator rods when it is installed at the underground railroad. This paper intended as an investigation of the irregular abrasion of section insulators, provides the field measurements of abrasion level along insulator length and the abrasion patterns. The height variation of insulator parts and the balding length of insulators against pantograph's contact force are analysed experimentally, and the irregular abrasion mechanism is clarified with the help of theoretical analysis on the interaction between pantographs and section insulators. On the basis of experimental and theoretical analysis, the countermeasures to reduce the irregular abrasion are provided too.

Development of Enhanced Insulator for Section Insulator (유리섬유가 충진된 PTFE 절연재를 채용한 이상용 절연구분장치 개발)

  • Cho, Ho-Ryung;Joo, Jong-Min
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.2173-2174
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    • 2011
  • At the moment, the section insulators for different phases used for over head contact wire system has been all imported since its first application. However, because the section insulators need frequent maintenance and replacement due to the wear by the friction with pantograph and the contamination, which causes its life shorter than as expected, it is required to develop the insulation material with better wear-resistance characteristics and contamination-resistance characteristics. In this thesis, the author developed the section insulator which adopts Teflon tube insulation material which is composed of the Teflon material with the excellent electrical characteristics and wear-resistance characteristics for a longer expected life than that made of conventional FRP.

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A Study on the Standardization of Fineness Measurement for the Thermal Insulator of Military Textiles (방한용 화섬솜의 섬도 측정방법의 표준화에 관한 연구)

  • Hong, Seong-don;Kim, Byung-soon
    • Journal of Korean Society for Quality Management
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    • v.43 no.3
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    • pp.253-272
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    • 2015
  • Purpose: The purpose of this study is to enhance the reliability of quality inspection by standardize the fineness test method of the thermal insulator of military textiles Methods: We have measured the thermal insulator of military textiles by microscope with three different ways and the effectiveness of their difference were analyzed by one-way layout design. Results: We have suggest the standardized the fineness test method of the thermal insulator of military textiles through advanced research. As a result we have verified hollow ratio of heat insulating fiber affect fineness test methods. The fineness test method for the thermal insulator applied with different methods following hollow ratio. We have verified that when the hollow ratio over 90%, the fineness of the thermal insulator measured from fiber-length, if it has over 80%, the cross-section length of hollow and if it has less 80%, the cross-section area of hollow is applied, respectively. Conclusion: This study indicated that the test method of fineness shows high reliability. Heat insulating fibers which have high evenness shows narrow variations(5/% or less, only CV 25%) irrespectively under different testing equipment or institute. Based ons the results, we have suggest the standardization of test methods for fineness by microscope method and produced the registration of Group Standard in Korean Standards Association.

Evaluation Technology of Electrical and reliableility Characteristics for Outdoor Polymer Insulator Materials (폴리머 절연물 소재의 전기적 밀 복합열화 특성평가 기술)

  • Ahn, Myeong-Sang;Park, Hoy-Yul;Na, Moon-Kyeong
    • Proceedings of the KIEE Conference
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    • 2006.07c
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    • pp.1343-1344
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    • 2006
  • There have been numerous accelerated aging laboratory tests for evaluating suitability of polymeric materials and devices. Aging test for materials and its full scale device has been conducted. Service experience plays a key role in the utility section of composite insulators. A meaningful and reliable accelerated aging test is needed for evaluating composite insulator. During the service these insulators are subjected to aging stress such as humidity, pollution, and electrical field, and erosion and tracking of the weathershed occurs. This paper presents the criteria of reliability evaluation and evaluation facilities for 22.9 kV suspension composite insulator. We adopt the criteria of reliability evaluation consist of two test methods. One is CEA tracking wheel test for examining the tracking and erosion performance of composite insulator. The other is multi-stress aging test for examining effects of environmental factors such as UV, temperature, humidity, etc on composite insulator.

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Reliability Evaluation Criteria and Multi-Stress Aging Test for Polymer Insulator (폴리머 현수애자의 신뢰성 평가 및 복합가속열화 방법)

  • Park, Hoy-Yul;Kang, Dong-Pil;Ahn, Myeong-Sang
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.07a
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    • pp.469-472
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    • 2004
  • There have been numerous accelerated aging laboratory tests for evaluating suitability of polymeric materials and devices. Aging test for materials and its full scale device has been conducted, but poor correlation of aging test such as service experience were observed. Service experience plays a key role in the utility section of composite insulators. A meaningful and reliable accelerated aging test is needed for evaluating composite insulator. During the service these insulators are subjected to aging stress such as humidity, pollution, and electrical field, and erosion and tracking of the weathershed occurs. This paper presents the criteria of reliability evaluation and evaluation facilities for 22.9 kV suspension composite insulator. We adopt the criteria of reliability evaluation consist of two test methods. One is CEA tracking wheel test for examining the tracking and erosion performance of composite insulator. The other is multi-stress aging test for examining effects of environmental factors such as UV, temperature, humidity, etc on composite insulator.

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A review of Safety standards for insulating materials in overhead contact line (전차선로 절연물의 안전성 평가기준 검토)

  • Lee, Bong-Jae;Jung, Ho-Sung;Lee, Ki-Won;Kwon, Sam-Young;Lee, Ki-Seung;Cho, Ho-Ryung
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.269-274
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    • 2008
  • The Seoul subway is acting the center of public transportation after the opening of the first line on August 15, 1974. and the subway line of the DC traction system is running and building to the ninth line. However, the main insulation parts used in overhead contact line are now imported from overseas products. Therefore, this paper considers domestic manufacture technology, supply easiness and economic effectiveness of insulation products and reviews the safety of support insulator used in rigid conductor line, stem insulator used in movable bracket and AC/DC different phase section insulator that localization development is necessary.

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The Study of relation most suitable betweenPantograp interface And Neutral Section (전기철도 절연구분장치와 팬터그래프 인터페이스 최적화에 관한 연구)

  • Kim, In-Chol
    • Proceedings of the KIEE Conference
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    • 2002.11d
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    • pp.325-329
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    • 2002
  • This paper is intended as an investigation of the interface between Neutral section insulators and pantograph interface. Neutral section insulators are installed at the boundary between AC catenary system and DC catenary system, which should provide electrical insolation between two different catenary systems and pass the trains without interruption. As the number of the pantographs installed on the train increased, which is necessary for the VVVF inverter drive trains introduced in recent years, there occurs an serious aspects of the interaction between pantographs and Neutral section insulators. These effects hinder the automatic switch operation of MCB(Main Circuit Breaker) after passing through the section insulators, and lead to the extra-ordinary wear of FRP insulator material of section insulators. Countermeasures in terms of the interface between the Neutral secton insulators and electric collection system of train are provided too.

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