纤维杂质对油纸复合绝缘局部放电特性影响研究
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国网四川省电力公司科技项目(52199720003N)


Influence of Cellulose Impurities on Characteristics of Partial Discharge in Oil-paper Composite Insulation
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    摘要:

    为研究纤维杂质对油纸绝缘局部放电特性的影响,搭建了直流油纸绝缘实验平台,观测了油中纤维杂质产生及成桥过程,就杂质成桥的动力学基础进行了分析,并对杂质影响下的油纸绝缘局部放电频数、平均放电量及最大放电量等特征参数进行了研究。结果表明,直流电压下纤维杂质在油中受电场力、重力、浮力及油黏性阻力作用。当杂质所在处场强大于2.12×105 V/m时,纤维杂质以缓慢速度向高压电极运动,且沿电压梯度最大方向成桥;纤维杂质畸变电场可使油纸绝缘局部放电频数上升、放电量下降。进一步实验表明,纤维小桥可导致油隙内泄漏电流增加,引起局部发热,并使油中水分局部气化为微小气泡。直流电压下低电导率气泡承担较强电场,先于变压器油发生放电,宏观表现为更加密集且强度较低的局部放电。

    Abstract:

    To investigate the influence of cellulose impurities on the characteristics of partial discharge (PD) in oil-paper insulation, a DC oil-paper insulation experimental platform is established. Processes including the generation and bridging of cellulose impurities in oil are observed, where the dynamic basis of bridging of cellulose impurities is analyzed. The characteristic parameters of PD in oil-paper insulation affected by cellulose impurities, including discharge frequency, average discharge magnitude and maximum discharge magnitude are studied. The results show that the cellulose impurities in oil under DC voltage are influenced by electric field force, gravity, buoyancy and oil viscous resistance. When the electric field strength is higher than 2.12×105 V/m, the cellulose impurities begins moving to high-voltage electrode at a slow speed and bridging along the maximum direction of voltage gradient. The distorted electric field of bridged impurities can cause an increase of PD frequency and a decrease of discharge magnitude. Further experiments show the cellulose bridge can increase the leakage current of oil gap, which leads to the local overheating and gasification of water contents in oil into tiny bubbles. Bubbles with low conductivity under DC voltage withstands stronger electric field, resulting in discharging before transformer oil and more concentrated PD with lower intensity.

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  • 在线发布日期: 2024-07-12
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