Research on the temperature and flow velocity characteristic of GIL based on multi-field coupling

Jin, Shangbin; Tian, Hui; Gong, Ao; Zhou, Shiyi; Wang, Haoran; Liu, Peng; Peng, Zongren

doi:10.1109/ceidp47102.2019.9009780

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…While the computing time and memory cost can be reduced by more than 70% in the calculation without the diffusion term compared to the calculation with the diffusion term. Thus, the diffusion term in (9) was removed in this study.…”

Section: Optimization Of Simulation Methodsmentioning

confidence: 99%

“…In operating GILs, large current flows through the central conductor. Joule heat is generated and a spatial distributed thermal gradient is established inside the GIL and the insulator [8, 9]. Since the electric conductivity of the insulator varies with the temperature [10], the electric field distribution is consequently affected under DC voltage which further affects the charge distribution [11].…”

Section: Introductionmentioning

confidence: 99%

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Influence of volume and surface conductivity on the transient surface charge characteristics of DC‐GIL insulator under thermal–electric coupled fields

Han

Wang

et al. 2022

IET Science Measure & Tech

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Here, the transient surface charge distribution of a basin-type insulator is investigated under thermal-electric coupled fields. Horizontally installed ±200 kV direct current gasinsulated transmission lines (DC-GIL) are employed, and a 3D geometric model is applied. An improved method is introduced in the transient simulation under coupled fields, which involves simplifying geometric model, decoupling calculation, applying weak form partial differential equation, and simplifying ion transport equation. The influence of volume and surface electric conductivity on the transient surface charge and electric field distribution is discussed. With increasing volume conductivity, the transient charge accumulation is accelerated due to the promotion of conduction through the insulator. With increasing volume conductivity, the polarity of the charge on convex surface changes from negative to positive, while it changes from positive to negative with increasing surface conductivity. This is the consequence of the transition in dominant conduction mechanism. Nonmonotonic variation of charge density is observed attributing to the variation transient field distribution. It can be concluded that the influence of volume and surface conductivity should be focused on when evaluating the insulation characteristics of DC-GIL insulators, and the thermal gradient should be considered in dealing with the long-term operating insulators. INTRODUCTIONThe insulator in gas-insulated equipment, for example gasinsulated transmission lines (GIL), acts as the supporting and insulating medium [1]. Usually, the insulator is made of epoxy resin composites with excellent insulating properties. Inside the enclosure, insulating gas is filled up to 4-7 bars. It is reported that flashover would occur at the gas/insulator interface which may be due to the electric field distortion [2, 3]. With the development of high voltage direct current (HVDC) transmission technology, DC-GIL attracts much attention. More obvious surface charge would accumulate on the insulator surface under DC voltage compared with the condition under alternating current (AC) voltage, and this may cause more serious field distortion in DC-GILs [4].

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Section: Optimization Of Simulation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%