Surface charge accumulation of post insulator: Dominant charge transition under different conditions
Surface charge accumulation of post insulator: Dominant charge transition under different conditions
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DOI：
10.1049/hve2.12344
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发表时间：
2023-07
期刊：
影响因子：
4.4
通讯作者：
Fangwei Liang;Feng Wang;She Chen;Qiuqin Sun;Lipeng Zhong
中科院分区：
文献类型：
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作者：
Fangwei Liang;Feng Wang;She Chen;Qiuqin Sun;Lipeng Zhong
绝缘子表面电荷可能导致沿绝缘子表面的闪络。在这项研究中，后绝缘子表面电荷的实验研究在不同的电压、气体类型和气体压力条件下进行。结合表面电荷输运模型，揭示了考虑气体局部放电时的主要电荷跃迁。结果表明，当直流电压为−10~−60 kV时，在1个大气压下，绝缘子上的高压电极附近会积累异极电荷。异极性电荷的面积比从23%增加到53%。它还会产生表面电荷的反极性。在−20KV下，随着0.5 Mpa混合气体中SF6含量的降低，接地电极附近的表面电荷逐渐变为同极电荷。在这种情况下，最主要的电荷积累途径是通过绝缘气体而不是绝缘体。对于20%SF_6/80%N_2混合气体，当SF_6/N_2混合气体压力降至0.1 Mpa时，在接地极板附近出现同极电荷散斑。这意味着局部放电发生在较低气压下的气侧。参考目前的研究结果，提供了支柱绝缘子上的主要电荷转变作为重要参考。
An insulator surface charge may be responsible for flashover along the insulator surface. In this study, experimental investigations of post insulator surface charge are performed using a variety of voltage, gas type, and gas pressure conditions. Combining the model of surface charge transport, the dominant charge transition is revealed considering gas partial discharge. The results show that hetero‐polar charge accumulates near the high voltage electrodes on the insulator at one atmospheric pressure with an applied DC voltage ranging from −10 to −60 kV. The area ratio of the hetero‐polar charge increases from 23% to 53%. It also generates a reversed polarity of surface charges. Under −20 kV, the surface charge near the grounded electrode gradually becomes homo‐polar charges with the decrease of SF6in 0.5 MPa SF6/N2gas mixtures. In this case, the most dominant pathway for charge accumulation is through the insulation gas rather than the insulator. For the 20%SF6/80%N2gas mixtures, homo‐polar charge speckles appear near the grounded plate electrode when the pressure of SF6/N2gas mixtures decreases to 0.1 MPa. This means that the partial discharge occurs in gas side under a lower gas pressure. Refer to the presenting findings, the dominant charge transition on post insulators is provided as an important reference.