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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Understanding the influence of water droplet initiated discharges on damage caused to corona-aged silicone rubber
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Understanding the influence of water droplet initiated discharges on damage caused to corona-aged silicone rubber

机译：了解水滴引发的放电对电晕老化硅橡胶造成的损坏的影响

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Corona activity on the surface of silicone rubber has high impact on variation in hydrophobicity of the material, and on corona inception voltage (CIV) of water droplet sitting on the corona degraded surface. The CIV is high under negative DC as compared to positive DC/AC voltages. Increase in conductivity of water droplet reduces CIV. Surface charge accumulation studies indicate that the charge retention capability of the insulating material gets reduced drastically with silicone rubber damaged due to corona causing degradation of surface. Irrespective of the number of cycles of corona discharge activities carried out, the time constant of charge decay, after the removal of charge injection, remains the same. The water droplet initiated discharges under AC and DC voltages radiate UHF signal in the bandwidth 0.3-1.2 GHz. With single droplet sitting on top of the corona damaged silicone rubber, the amount of charge retained by the water droplet is low when the droplet is placed and charged immediately after corona discharge activity to surface of the insulating material. When the water droplet is placed after a certain time period, the charge accumulation characteristics of silicone rubber are regained. Leakage current measured during water droplet discharge studies through recurrent plot (RP) analysis reveals that, under AC voltage, it is possible to classify corona inception, arcing and bridging of water droplet between high voltage and ground electrode. The RP obtained for the current signals generated due to water droplet discharges under positive and negative DC voltages are different. The amount of damage caused to silicone rubber due to water droplet is high under negative DC voltage as compared to positive/AC voltages. While correlating the level of damage to the insulating material due to water droplet and the RQA parameters of RP, it is observed that higher the recurrence rate along with high determinism can cause severe damage to the insulating material. Structural analysis using ATR-FTIR and pyrolysis-GC/MS studies reveal significant functional group variation on surface of silicone rubber, especially when the number of cycles of corona ageing is more.
机译：硅橡胶表面上的电晕活性对材料的疏水性变化以及对位于电晕退化表面上的水滴的电晕起始电压（CIV）都有很大影响。与正DC / AC电压相比，在负DC下CIV较高。水滴电导率的增加会降低CIV。表面电荷累积研究表明，由于电晕导致表面退化，绝缘材料的电荷保持能力急剧下降，而硅橡胶也因此受损。不管进行电晕放电活动的周期数如何，在去除电荷注入后，电荷衰减的时间常数都保持不变。在AC和DC电压下，水滴引发的放电会辐射0.3-1.2 GHz带宽的UHF信号。当单个液滴位于电晕损坏的硅橡胶的顶部时，当液滴被放置并在电晕向绝缘材料表面放电后立即被充电时，水滴保留的电荷量很低。在一定时间后放置水滴时，恢复了硅橡胶的电荷累积特性。通过回流图（RP）分析在水滴放电研究过程中测得的泄漏电流表明，在交流电压下，可以对高压与接地电极之间的水滴的电晕起始，电弧和桥接进行分类。在正负直流电压下，由于水滴放电而产生的电流信号获得的RP不同。与正/交流电压相比，在负直流电压下，水滴导致的硅橡胶损坏量很高。尽管将水滴对绝缘材料的损坏程度与RP的RQA参数关联起来，但观察到较高的重复率和较高的确定性会严重损坏绝缘材料。使用ATR-FTIR和热解-GC / MS研究的结构分析表明，硅橡胶表面的官能团存在显着变化，尤其是当电晕老化的循环次数更多时。

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