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| Review of Charge Accumulation Characteristics at Gas-Solid Interface in DC GIL, Part Ⅱ: Charge Control and Suppression Strategy |
| Zhang Boya1, 2, Zhang Guixin2 |
1. State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China;
2. Department of Electrical Engineering Tsinghua University Beijing 100084 China |
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Abstract Charge accumulation at gas-solid interface is an important factor that causes the decrease of insulation performance in DC gas-insulated transmission line (GIL). Therefore, it is of great significance to explore the charge control and suppression strategy for the development of a DC GIL. In this paper, based on the Review Part Ⅰ, the current charge control and suppression methods were summarized from three aspects: insulation structure optimization, insulator surface modification, and bulk doping of the insulator material. Their advantages and disadvantages were evaluated. Finally, prospects for future structure and material design of GIL insulators were presented. Using orientated structure on the insulator surface provides a new idea for suppressing charge accumulation. Meanwhile, the synergistic effect of the insulator structure and material modification should be adopted to adaptively control the charge, which is the direction of designing “smart” insulators in the future.
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Received: 19 June 2018
Published: 27 November 2018
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2018, Vol. 33 
