Electric Power ›› 2020, Vol. 53 ›› Issue (12): 206-213.DOI: 10.11930/j.issn.1004-9649.201903057

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Humidity Control of RMU Based on COMSOL Simulation Analysis

WANG Yinchao1, DING Yinmei1, LI Weibin1, YANG Yong1, WANG Yueqiang1, WANG Hugen2, QIAO Fei2, WANG Junsheng2, XIE Yong1, YU Jiamin1, LU Zhongxin1   

  1. 1. Changxing Power Supply Company of Shanghai Electric Power Co., Ltd., Shanghai 202150, China;
    2. China Electrical Construction Group Equipment Research Institute Co., Ltd., Shanghai 201399, China
  • Received:2019-03-26 Revised:2019-10-10 Published:2020-12-16
  • Supported by:
    This work is supported by National Natural Science Foundation of China (No.51577135) and Science Foundation of Shanghai Municipal Commission of Science and Technology (No.17511109300)

Abstract: The long-term operation of ring main unit (RMU) in humid condensation environment will lead to the decrease of insulation strength of equipment, which will result in discharge and breakdown faults, and further shorten the service life of equipment. Therefore, it is very necessary to ensure a good operation environment for RMU. Semiconductor condensation dehumidification is an emerging dehumidification technology that controls the humidity in the cabinet by condensing moisture and discharging it out of the cabinet. In this paper, the COMSOL simulation software is used to simulate semiconductor condensation dehumidification. The air flow field, heat field and water transport in the dehumidifier are coupled to study the distribution changes of flow field, temperature and relative humidity after the installation of the dehumidifier, as well as the influence of dehumidifier installation position on dehumidification effect. The results show that the temperature inside the RMU changes little after the installation of the dehumidifier, the relative humidity can be reduced from 90% to 50% in about 11h, and the dehumidification effect is the best when the dehumidifier is installed at the bottom of the cabinet. The results of the simulation are verified by experiments. In this paper the influence of installation position of dehumidifier on temperature and humidity distribution and dehumidification effect in RMU is given, which can provide a reference for installation of dehumidifier in RMU.

Key words: RMU, condensation dehumidification, COMSOL, relative humidity, control