Research on temperature rise of high current swicthgear in distribution system.pdf - The Journal of Engineering The 14th IET International Conference on

Research on temperature rise of high current swicthgear in distribution system.pdf

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The Journal of Engineering The 14th IET International Conference on AC and DC Power Transmission (ACDC 2018) Research on temperature rise of high current switchgear in distribution system eISSN 2051-3305 Received on 29th August 2018 Revised 13th September 2018 Accepted on 24th September 2018 E-First on 29th November 2018 doi: 10.1049/joe.2018.8769 Xiaorui Wang 1 , Suxiong Cai 2 , Zhaowei Peng 1 , Zhanqing Yu 1 , Shisen Gao 2 , Zerong Huang 2 , Yonggang Guan 1 , Haotian Xia 1 , Rong Zeng 1 1 Department of Electrical Engineering, Tsinghua University, Beijing, People's Republic of China 2 Huizhou Power Supply Bureau of Guangdong Power Grid Co., Ltd, Guangdong, People's Republic of China E-mail: [email protected] Abstract: With the increase of the load of the switchgear, the overheating of the switchgear is more and more serious. In this article, the authors give the primary heat sources in the electrical equipment. According to these sources, they explore the reason of why the switchgear can be overheated during operation. Then, they build a 3D model in the Comsol & Multiphysics® and analyse the temperature state of the switchgear from the simulation. They also carry out temperature test on KYN28 switchgear to summarise the laws of the temperature change of the switchgear. Finally, they propose a brief method to monitor the temperature and realise the function of temperature warning to avoid accidents caused by overheating. 1 Introduction With the development of west-to-east electricity transmission projects and regional interconnected power network, the construction of ultra-high-voltage interconnected grid becomes an imperative requirement [1]. With the increase of the load of the power system, there is more heat in the switchgear than before. In some occasions, the switchgear may burst into explosion because of the accumulating heat, which always causes a severe harm to the power system and people's daily life. So we have to study the mechanism of the heat generation, find out the solution to monitor the temperature state of the switchgear, and realise the temperature warning. Reference [2] gives accurate calculating formulas of the heat source in electrical equipment which can also be applied to the switchgear. Authors of reference [3] set up a simulation model of the switchgear in solid works and show several figures of the simulation results. Reference [3–6] also shows their simulation of the switchgear and paper [4] shows the detailed temperature distribution. With the simulation results, some authors start to detect the temperature of the switchgear using infrared temperature measurement method [7] or optical fibre temperature sensor [4]. Reference [8] designs a temperature system to conduct temperature prediction and temperature warning. In fact, the difficulties of temperature warning of switchgears are the methods to monitor temperature and the algorithm of temperature warning. We need very small sensors to detect the temperature in small space, and we need a very comprehensive analysis of the algorithm to prevent any overheating accidents.
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