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진공인터럽터 내부 End Shield형상과 갭거리에 따른 연면방전거동
윤재훈,임기조,Yoon, Jae-Hun,Lim, Kee-Jo 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.2
Because of power consumption increase, global warming, and limitation of installation, not only high reliability and interruption capability but also compact and light power apparatuses are needed. In this paper, E field calculation and experiment were processed to identify the influence of the shape of end shield and gap distance. It is expected that the results of FEM simulation and experiments could be the basic data to develop VI. the results of FEM simulation and experiments are as following. Firstly, maximum E fields were compared by means of finite element method as a function of the shape of end shield. 3 types of models were used to analyze maximum E field of each model and the influence of shape of shield could be identified. As a result, proposed L type shield could reduce the maximum E field by 20%. Secondly, the influence of the gap distance between end shields on E field was analyzed. As the gap distance become short the gap distance between inner walls of ceramic also become short. And the maximum E field concentrated on inner wall of ceramic finally increased. Thirdly, the experiment was conducted by fabricating each prototype. As a result, no creepage occurred in shieldless model. In other words, creepage occurred in the shield-installed models. And creepage inception voltages were different from each other because of the difference of maximum E field. Fourthly, The equation that shows relation between calculated E field and measured creepage inception voltage was proposed as a result of FEM analysis and experiment. It is concluded that when designing VI this equation could be important data to reduce time and cost by identifying indirectly the optimal gap distance and the shape of shield required to prevent creepage.
윤재훈(Jae-Hun Yoon),임종남(Jong-Nam Lim),임기조(Kee-Jo Lim),강성화(Seong Hwa Kang) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
In a wide variety of high-voltage applications surface flashover plays major role in the system's performance and yet has not been studied in great detail for vacuum conditions with modern diagnostic tools. surface flashover for both direct current and pulsed voltages in considered. within the setup, parameters such as geometry, material characteristics of the applied voltage can be altered. This paper review surface flashover of insulator, primarily in vacuum. It discusses theories and models relating to surface flashover and experimental results. surface flashover of insulators in vacuum generally is initiated by the emission of electrons from the cathode triple junction point (the region where the electrode, insulator, vacuum). the electrode material was copper, and a AC voltage was applied between the electrodes. these results were compared with the surface flashover characteristic of insulator at results, surface flashover influenced only insulator surface condition. and increasing vacuum pressure was risen breakdown voltage.
XLPE 절연물내의 전기트리 진전 시 PD 검출 및 특성분석
박성희(Seong-Hee PARK),정해은(Hae-Eun JUNG),강성화(Seong-Hwa KANG),임기조(Kee-Jo LIM) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
Solid insulation exposed to voltage is degraded by electrical tree process. And the degradation of the insulation is accelerated by voltage application. For this experimental, specimen of electrical tree model is made by XLPE (cross-linked polyethylene). And the size of the specimen is 7*5*7 ㎣. Distance of needle and plane is 2 ㎜. Voltages applied for acceleration test are 12 ㎸ to 15 ㎸. And distribution characteristic of degraded stage is studied too. As a PD detecting and data process, discharge data acquire from PD detecting system (Biddle instrument). The system presents statistical distribution as phase resolved. Moreover the processing time of electrical tree is recorded to know the speed of degradation according to voltage.
윤재훈(yoon jae hun),김병철(kim beung chuel),이승수(lee sung su),임기조(lim kee jo),강성화(kang seong hwa) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
This paper describes the influence of shield(Arc shield) on the electric fields in a vacuum interrupter(Ⅵ). The equipotential line and electric field in a Ⅵ are analysed by a finite element method at various shield length. in result. The electric potentials of Arc shield edge was increased because the length too short or long approach the source, it confirmed that equipotential line was influenced that shape and length by end shield, finally this pater proposed to optimal length and shape by arc shield.
윤재훈(Jae-Hun Yoon),정의환(Eui-Hwan Jung),임기조(Kee-Jo Lim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Because of power consumption increase, global warming, and limitation of installation, not only high reliability and interruption capability but also compact and light power apparatuses are needed. In this paper, various models that short and long gap distance were used to analyze E field of each model. Calculation value was estimated of flashover position. As a result, short and long gap distance that vacuum interrupter inner between move electrode and fix electrode not coincided flashover position of each model. short gap distance estimated flashover position at electrode edge. but long gap distance model confirmed E<SUB>max</SUB> value at center shield. in this paper was compared electric field value. and estimated of conditioning position from electric field calculation
진공 인터럽터 내부 Shield형상에 따른 전계분포 해석
윤재훈(yoon jae hun),김병철(kim beung chuel),이승수(lee sung su),임기조(lim kee jo),강성화(kang seung hwa) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.5
this paper describes the electric field distribution interpretation along a shield form inner vacuum interrupter(VI). The equipotential line and electric field in a VI are analysed by a finite element method at various shield form. in result, The electric potentials of end shield form was increased or decreased because it was various the length of shield and between external insulation and source area or fix._end shield. finally shield is how to electric field affect, and advance, and will achieve the optimum design of VI inside shield.
진공 인터럽터 내부 쉴드간 gap에 따른 연면방전 특성파악
윤재훈(Yoon jae-hun),이승수(Lee seung-su),임기조(Lim kee-jo),김성태(Kim sung-tae) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
this paper describes the electric field distribution analysis along a shield gap inner vacuum interrupter(Ⅵ). The equipotential line and electric field and field vector in a Ⅵ are analysed by a finite element method and experiment at shield gap. in result, The equipotential line and electric field distribution was affected to Ⅵ shield gap. The reason is as it gets distortion of equipotential line done, finally, this paper recognized whether or not affected, and proposed gap with the most suitable shield length and an external insulation
윤재훈(Jae-Hun Yoon),정의환(Eui-Hwan Jung),임기조(Kee-Jo Lim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
HVDC전력용 케이블의 절연재 설계시 고전압하에서의 절연파괴강도는 절연재료의 초기 건전성을 결정하는 중요한 지표이다. 그러나 국내에서는 HVDC용 케이블에 적합한 절연성능 연구가 미흡한 실정이다. 절연파괴강도에 대한 검토는 장기적인 절연성능을 좌우하는 중요한 요소이며 절연열화 현상을 진단하는 방법으로도 이용되고 있다. 본 연구는 상온에서 DC케이블 절연제로 쓰이는 XLPE의 직류파괴강도와 이에 따른 온도의존성을 검토해보았다.