12~24kV氮气绝缘环网柜的研制

发布时间：2018-05-31 23:42

本文选题：环网柜 + 氮气绝缘　；参考：《高电压技术》2014年12期

【摘要】：在气体绝缘环网柜中使用环保的氮气或干燥空气取代SF6气体,又要保持紧凑和小巧的特点,必须要对环网柜绝缘结构进行优化设计。为此,就氮气的绝缘特性和氮气绝缘中压环网开关柜的典型绝缘结构(如间隙绝缘、复合绝缘、支撑绝缘子和穿墙套管沿面绝缘)的最大电场强度进行了分析研究。进而探索了降低氮气绝缘环网柜内电场强度的有效方法和途径:通过改善导体形状可降低气隙间电场不均匀系数至2~3;采用复合绝缘可降低氮气介质最大电场强度约20%;采用双断口结构和复合屏蔽绝缘,可实现工频耐受75 k V/1 min、雷电冲击耐受±145 k V的隔离断口绝缘水平;优化电极形状和绝缘体外形设计,可降低沿面绝缘破坏起始处电场强度,实现在工频耐受65 k V/1 min、雷电冲击耐受±125 k V的绝缘水平;通过电场屏蔽件的设计可降低局部电场集中,提高柜体整体绝缘水平。研制成功了符合IEC 62271-1和GB 11022标准绝缘水平要求的12~24 k V氮气绝缘环网柜(柜宽400 mm)并通过了型式试验,证明了环网柜采用氮气绝缘的可行性。
[Abstract]:In order to keep the characteristics of compact and compact, it is necessary to optimize the insulation structure of the annular cabinets by using the environmental nitrogen or dry air to replace the SF6 gas in the gas insulated ring cabinets. For this reason, the insulation characteristics of nitrogen gas and the maximum electric field strength of typical insulation structures (such as gap insulation, composite insulation, support insulator and wall casing insulation) of nitrogen insulation medium voltage ring switchgear are analyzed and studied. The effective methods and ways to reduce the electric field intensity in the nitrogen insulated ring net cabinet are explored: by improving the shape of the conductor, the non-uniformity coefficient of electric field between the air gap can be reduced to 2 ~ 3, and the maximum electric field intensity of the nitrogen dielectric can be reduced by using composite insulation. About 20; double fracture structure and composite shielding insulation, It can realize 75 kV / 1 min of power frequency tolerance and lightning shock tolerance 卤145 kV, optimize electrode shape and insulator shape design, reduce the electric field intensity at the beginning of the insulation failure along the plane, At 65 kV / 1 min of power frequency tolerance, the lightning shock resistance to 卤125 kV can be achieved, the local electric field concentration can be reduced by the design of electric field shield, and the overall insulation level of the cabinet can be improved. A 124kV nitrogen insulated ring net cabinet (400mm wide), which meets the requirements of IEC 62271-1 and GB 11022, has been successfully developed and has passed the type test, which proves the feasibility of using nitrogen insulation in ring network cabinets.
【作者单位】：上海天灵开关厂有限公司;
【分类号】：TM591

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