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RISS 인기검색어
- 검색키워드
- 저자 : Li Qingmin (검색결과 4 건)
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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.
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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.
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A Load Balancing Multi-path Secure Routing Scheme for Wireless Sensor Networks
Jianmin Zhang,Hao Li,Qingmin Cui 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.6
Lifetime optimization and security are two important design issues for WSNs with non-replenishable energy resources. Routing protocols in wireless sensor networks (WSNs) are susceptible to a number of attacks depending on the nature of the protocol, its application, and the environment in which the protocol is intended to be used. Routing protocols that do not take the malicious attacks into account can not be easily temper proofed. The longevity of WSNs is a crucial concern that significantly influences their applicability in a specific context. In this paper, we present a Load Balancing Multi-path Secure Routing (LBMSR) protocol to address these two issues concurrently through balanced energy consumption and one-way hash key chain and symmetric key cryptography. LBMSR is designed with two configurable parameters, load balance control and security level. Load balance is used to avoid the problem of energy consuming imbalance and the formation of energy holes. Security level is designed to determine the probabilistic distribution of the random walking that provides routing security. Simulation results and security analyses show that the proposed algorithm can provide excellent balance between routing efficiency and energy consumption while preventing routing attacks.
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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.
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