http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Cong Haoxi (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Research on Undetected Overheat Fault of the GIS Bus Bar Contacts Based on Infrared Thermal Imaging
Haoxi Cong,Hu Jin 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.2
The overheating problem of GIS contacts would lead to a major accident. Recently, it was found that the infrared thermal imager cannot detect the overheating fault timely in many cases. In order to solve the above issues, a temperature rise test platform of the 252 kV GIS bus bar was built, and the bus bar temperature fi eld distribution under normal operation and fault conditions was obtained. Then a three-dimensional simulation model was established based on the experimental platform. With the use of the fi nite element method, the temperature distribution of the GIS bus bar were compared with the experimental data. Results show that the temperature rise at normal contact condition is very small. The temperature distribution of the three-phase conductor is basically the same. The temperature of the SF 6 gas is tiny diff erence in the upper area of the GIS cavity while the SF 6 gas temperature is signifi cantly diff erent in the area below the GIS cavity. The air temperature outside the shell gradually decreases from the top to the bottom along the vertical direction, with the highest temperature at the top and the lowest at the bottom. However, the contact temperature would rise greatly rapidly at poor contacts while the shell temperature changes very small. Therefore, the method of measuring the shell temperature by infrared thermal imager can only be applied to the relatively slow temperature rise process in the GIS, in which the slow change of the contact temperature can be refl ected on the shell. On the contrary, this method cannot be applied to the fault with fast temperature rise, as the contact temperature changes cannot be refl ected on the shell timely. The above research work could provide theoretical basis and data support for revealing the temperature distribution inside GIS and determining the most sensitive position of temperature monitoring.
-
Principle Issues and Future Prospect on Sliding Arc Ablation of Metal Rail
Cong Haoxi,Zhou Yang,Zhaori Getu,Wang Yuxuan,Wei Haobo,Liu Zhaoling,Wang Jian,Zhang Li,Liu Hongshun,Li Qingmin 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
Arc ablation occurs when the armature passes over the surface of metal rail. Ablation not only seriously afects the service life, but also may cause the failure to launch. In this paper, the research status of sliding arc ablation technology is summarized from the mechanism of sliding arc ablation, the characterization method of sliding arc ablation degree, and the enhanced design of materials or structures. Three key issues that need to be further solved are listed: the infuence mechanism of sliding arc ablation on microstructure and properties of metal materials, the service properties evaluation and quantitative characterization methods of metal material, as well as the modifed and enhanced design of materials or structures. In response to those problems, eforts are needed to improve the awareness of sliding arc ablation with the theoretical basis and characterization methods, as well as guide the improvement and strengthening of rail design.
-
On-line Temperature Monitoring of the GIS Contacts Based on Infrared Sensing Technology
Qingmin Li,Haoxi Cong,Jinyuan Xing,Bo Qi,Chengrong Li 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.4
Gas insulated switchgear (GIS) is widely used in the power systems, however, the contacts overheating of the inside circuit breaker or disconnector may be a potential cause of developing accidents. As the temperature of the contacts cannot be directly acquired due to existence of the metallic shield, an infrared sensor is adopted to directly measure the temperature of the shield and then the contacts temperature can be indirectly obtained by data fitting, based on which the on-line temperature monitoring technology specifically for GIS contacts based on infrared sensing is proposed in this paper. A real GIS test platform is constructed and experimental studies are carried out to account for the influential factors that affect the accuracy of the infrared temperature measurement. A heat transfer model of the GIS module is also developed, together with experimental studies, the nonlinear temperature relationship among the contacts, the metallic shield and the environment based on a neural network algorithm is established. Finally, an integrated on-line temperature monitoring system for the GIS contacts is developed for on-site applications.
-
On-line Temperature Monitoring of the GIS Contacts Based on Infrared Sensing Technology
Li, Qingmin,Cong, Haoxi,Xing, Jinyuan,Qi, Bo,Li, Chengrong The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.4
Gas insulated switchgear (GIS) is widely used in the power systems, however, the contacts overheating of the inside circuit breaker or disconnector may be a potential cause of developing accidents. As the temperature of the contacts cannot be directly acquired due to existence of the metallic shield, an infrared sensor is adopted to directly measure the temperature of the shield and then the contacts temperature can be indirectly obtained by data fitting, based on which the on-line temperature monitoring technology specifically for GIS contacts based on infrared sensing is proposed in this paper. A real GIS test platform is constructed and experimental studies are carried out to account for the influential factors that affect the accuracy of the infrared temperature measurement. A heat transfer model of the GIS module is also developed, together with experimental studies, the nonlinear temperature relationship among the contacts, the metallic shield and the environment based on a neural network algorithm is established. Finally, an integrated on-line temperature monitoring system for the GIS contacts is developed for on-site applications.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
