Influence of Hydrostatic Pressure on Discharge of Insulated Oil-Paper Surface under Column Plate Electrode
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摘要:
探明油纸绝缘在不同液压条件下的放电特性，既可以完善油纸绝缘设备的运检策略，也可以为油纸绝缘设备小型轻量化提供参考. 为此，在自行设计的密闭无局放容器中，对柱板油纸绝缘模型进行不同液压条件下（0.01 ~ 0.60 MPa）的沿面放电试验. 测量了不同液压下油纸绝缘柱板沿面放电发展过程中的放电表征参量，记录了从起始放电到击穿过程中的多个局部放电参数，拍摄了放电过程中白斑和气体现象；根据前人的研究结果，结合不同液压下气体的溶解和压缩规律，推导出了压强增加对油纸绝缘中的气体缺陷具有抑制效应；通过不同液压下放电过程中的白斑和气泡现象，对推导结果进行了验证. 试验和推导结果共同表明：沿面放电的起始放电电压和击穿电压均随压强的上升而增加；在同一电压等级下，最大放电量、平均放电量、放电重复率和放电功率均随压强的上升而减小.
Abstract:Figuring out the operation discharge characteristics of oil-paper insulation under different hydrostatic pressures can improve the operation and maintenance strategy of oil-paper insulation equipment, and can also provide a reference for the miniaturization and weight reduction of oil-paper insulation equipment. For this reason, surface discharge tests of oil-paper insulation were carried out on the column plate model under hydrostatic pressures ranging between 0.01 and 0.60 MPa in a self-designed hermetic oil tank without local discharge. The characteristic discharge parameters were measured in the development processes of discharge over the surface of the insulated oil-paper under different hydrostatic pressures. Several partial discharge parameters from initial discharge to breakdown, white spot and bubble were recorded. According to the previous results, together with the law of gas gas dissolution and compression under different hydrostatic pressures, it is inferred that the hydrostatic pressure increase has a inhibitory effect on gas defects in oil-paper insulation. The white spot and bubble during discharge under different hydrostatic pressures verify the inferred results. Both the test results and inferred results show that the initial discharge voltage and breakdown voltage increase as the hydrostatic pressure. Under the same voltage level, the peak discharge capacity, average discharge capacity, discharge repetition rate, and discharge power decrease as the hydrostatic pressure rises.
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Key words:
- oil-paper insulation /
- hydrostatic pressure /
- surface discharge /
- white mark /
- bubble
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图 2 起始放电电压、击穿电压和两者差值与液压的关系
Figure 2. Relationships of PDIV, breakdown voltage，and their difference with hydrostatic pressure
图 3 不同液压下最大放电量随电压的增长
Figure 3. Relationship between peak discharge capacity and applied voltage under different hydrostatic pressures
图 4 不同液压下平均放电量随电压的增长
Figure 4. Relationship between average discharge capacity and applied voltage under different hydrostatic pressures
图 5 不同液压下放电重复率随电压的增长
Figure 5. Relationship between discharge repetition rate and applied voltage under different hydrostatic pressures
图 6 不同液压下平均放电电流和平均放电功率随电压的增长
Figure 6. Relationship between average discharge current,average discharge power and applied voltage underdifferent hydrostatic pressures
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