CAJ | 학술논문

为研究叠加电场作用下油纸绝缘的油流带电特性，在实验室搭建了同轴圆柱电极结构的油纸绝缘模型，利用密闭油循环系统开展了叠加电场下油流带电的试验研究，并探讨了外施电压幅值、直流分量比例和油流速度对油流带电的影响。试验结果表明，流速和外施电压幅值对冲流电流的影响与温度有关。在低温下冲流电流随流速和外施电压幅值线性增加，提高直流分量比例会促进冲流电流；在高温下冲流电流随流速指数增加，随外施电压幅值提高出现峰值，峰值电压随直流分量比例提高而下降。理论分析表明：较低温度下油中冲流电流大小取决于纸中负离子的迁移和扩散速度；而在较高温度下该冲流电流取决于油流剥离正离子的速度和外电极处电荷泄放的速率；温度通过影响绝缘中离子迁移速度和电场分布而影响油流带电特性。
위연구첩가전장작용하유지절연적유류대전특성，재실험실탑건료동축원주전겁결구적유지절연모형，이용밀폐유순배계통개전료첩가전장하유류대전적시험연구，병탐토료외시전압폭치、직류분량비례화유류속도대유류대전적영향。시험결과표명，류속화외시전압폭치대충류전류적영향여온도유관。재저온하충류전류수류속화외시전압폭치선성증가，제고직류분량비례회촉진충류전류；재고온하충류전류수류속지수증가，수외시전압폭치제고출현봉치，봉치전압수직류분량비례제고이하강。이론분석표명：교저온도하유중충류전류대소취결우지중부리자적천이화확산속도；이재교고온도하해충류전류취결우유류박리정리자적속도화외전겁처전하설방적속솔；온도통과영향절연중리자천이속도화전장분포이영향유류대전특성。
In order to investigate the flow electrification characteristics of oil-paper insulation under the AC superimposed DC electric field, an oil-paper tube model with concentric cylindrical electrode geometry was built in laboratory. Experiment study on flow electrification under AC superimposed DC electric field was carried out with the closed oil circulating system, and the influence of voltage amplitude, DC component ratio and oil flow velocity on flow electrification was discussed. The experiment results show that the influences of oil flow velocity and the amplitude of applied voltage on streaming currents are related to temperature. At low temperature, the streaming current increases linearly with flow velocity and amplitude of applied voltage, and the increase of the DC component ratio can enhance the streaming current. At high temperature, the streaming current increases exponentially with flow velocity and shows peak effect with amplitude of applied voltage. The peak point voltage decreases with the DC component ratio. The theoretical analysis demonstrates that the streaming current depends on migration and diffusion rate of the negative ion in paper at low temperature. However, at high temperature, it is related to the stripped rate of positive ion by oil flow and the charge leakage rate at the outer electrode. The temperature can influence the flow electrification characteristics by affecting the ions migration speed and the electric field distribution in the insulation.