技术领域：Technical field:
本发明属于绝缘纸板制备技术领域，具体涉及一种基于纳米改性的高击穿强度绝缘纸板制备方法及其纸板筒。The invention belongs to the technical field of insulating cardboard preparation, and in particular relates to a method for preparing insulating cardboard with high breakdown strength based on nano-modification and a cardboard tube thereof.
背景技术：Background technique:
换流变压器是直流输电系统的关键、核心部件，它承担着直流输电系统电能变换的重要任务，整个电力系统的安全运行由其可靠性决定。出线装置作为换流变压器与换流阀之间的关键连接部分，最容易产生电场集中现象。换流变压器出线处与阀侧绕组相同，除了承受雷电、操作过电压外，还必须承受交流、直流、交直流叠加和极性反转电压的作用，运行条件的复杂性对换流变压器出线装置油纸复合绝缘系统来说是个严峻的考验。The converter transformer is the key and core component of the DC transmission system. It undertakes the important task of power conversion in the DC transmission system. The safe operation of the entire power system is determined by its reliability. As the key connecting part between the converter transformer and the converter valve, the outlet device is most prone to electric field concentration. The outlet of the converter transformer is the same as the valve side winding. In addition to withstanding lightning and operating overvoltage, it must also withstand the effects of AC, DC, AC-DC superposition and polarity reversal voltage. It is a severe test for oil-paper composite insulation system.
绝缘纸板筒作为换流变压器出线装置绝缘系统内部最主要的固体绝缘材料，提高其直流和交流条件下的击穿强度对于出线装置系统内部绝缘相当重要。且绝缘纸板的相对介电常数高于变压器油的相对介电常数，且受温度、含水率等因素的影响严重，交流电压作用下变压器油承受更高的场强，会出现电场的高度集中且分布很不均匀，仅从换流变压器出线装置的结构上调整并不能有效的解决上述问题。The insulating cardboard tube is the most important solid insulating material inside the insulation system of the outlet device of the converter transformer. Improving its breakdown strength under DC and AC conditions is very important for the internal insulation of the outlet device system. Moreover, the relative dielectric constant of the insulating cardboard is higher than that of the transformer oil, and it is seriously affected by factors such as temperature and moisture content. The distribution is very uneven, and the above-mentioned problems cannot be effectively solved only by adjusting the structure of the converter transformer outlet device.
发明内容：Invention content:
本发明的目的在于针对上述换流变压器出线装置油纸复合绝缘系统中提高绝缘纸板筒直流和交流条件下的击穿强度对于出线装置系统内部绝缘的重要性；以及绝缘纸板的相对介电常数高于变压器油的相对介电常数，交流电压作用下变压器油承受更高的场强，会出现电场的高度集中且分布很不均匀的问题，提供了一种基于纳米改性的高击穿强度、低介电常数绝缘纸板制备方法及纸板筒。The purpose of the present invention is to improve the breakdown strength of the insulating cardboard tube under DC and AC conditions in the above-mentioned converter transformer outlet device oil-paper composite insulation system for the importance of the internal insulation of the outlet device system; and the relative dielectric constant of the insulating cardboard is higher than The relative dielectric constant of transformer oil, under the action of AC voltage, transformer oil bears higher field strength, and there will be problems of highly concentrated and uneven distribution of electric field, which provides a nano-modified high breakdown strength, low A method for preparing a dielectric constant insulating cardboard and a cardboard tube.
一种基于纳米改性的高击穿强度绝缘纸板制备方法，具体步骤为：用标准疏解器疏解处理液态纸浆，同时将纳米改性剂溶剂在超声波清洗机中超声分散处理，将处理过的液态纸浆和纳米改性剂溶剂混合后用增力电动搅拌机搅拌，再使用纸样抄取器对混合改性剂的液态纸浆进行抄取成型，送至平板硫化机将湿纸页压榨后用纸样抄取器对其真空干燥处理成纸板。A method for preparing insulating paperboard with high breakdown strength based on nano-modification. The specific steps are: use a standard deflaker to decompose and treat liquid pulp, and at the same time, ultrasonically disperse the nano-modifier solvent in an ultrasonic cleaning machine. After mixing the pulp and the nano-modifier solvent, stir it with a power-intensive electric mixer, and then use the paper sampler to take the liquid pulp mixed with the modifier and send it to the flat vulcanizer to press the wet paper sheet and then use the paper sample to copy It is vacuum-dried and processed into cardboard.
所述纳米改性剂溶剂在超声波清洗机中超声分散处理时加入官能团改性剂，最后制得经过表面修饰的纳米改性绝缘纸板。The nano-modifier solvent is added with a functional group modifier during ultrasonic dispersion treatment in an ultrasonic cleaning machine, and finally a surface-modified nano-modified insulating paperboard is obtained.
所述的纳米材料为纳米氧化铝或蒙脱土。纳米氧化铝由于量子尺寸效应、表面效应、小尺寸效应和宏观量子隧道效应的作用而具有良好的电学、磁学、热学、光学和化学方面的性质，应用前景非常广阔。蒙脱土是一种层状硅酸盐添加剂，具有大比表面积、高表面活性和高强度等特点，被广泛应用在高分子聚合材料中表现出优良的电气性能，深受材料科学界青睐。The nano material is nano aluminum oxide or montmorillonite. Due to the quantum size effect, surface effect, small size effect and macroscopic quantum tunnel effect, nano-alumina has good electrical, magnetic, thermal, optical and chemical properties, and has a very broad application prospect. Montmorillonite is a layered silicate additive that has the characteristics of large specific surface area, high surface activity and high strength. It is widely used in polymer materials and exhibits excellent electrical properties, and is favored by the material science community.
作为本发明的进一步改进，所述的纳米氧化铝的粒径为10～100nm，蒙脱土的粒径为200～400目。As a further improvement of the present invention, the particle size of the nano-alumina is 10-100 nm, and the particle size of the montmorillonite is 200-400 mesh.
作为本发明的进一步改进，所述纳米氧化铝加入的质量为绝缘纸板质量的2.3～2.7％，蒙脱土加入的质量为绝缘纸板质量的0.8～1.2％。As a further improvement of the present invention, the added mass of the nano-alumina is 2.3-2.7% of the mass of the insulating cardboard, and the mass of the added montmorillonite is 0.8-1.2% of the mass of the insulating cardboard.
作为本发明的进一步改进，绝缘纸板筒采用基于纳米改性的高击穿强度绝缘纸板制备方法制得的绝缘纸板制成，绝缘纸板筒为球形纸板筒，将换流变压器出线装置结构中的均压球部置于球形纸板筒内。As a further improvement of the present invention, the insulating cardboard tube is made of insulating cardboard based on nano-modified high-breakdown strength insulating cardboard. The insulating cardboard tube is a spherical cardboard tube. The pressing ball part is placed in a spherical cardboard tube.
作为本发明的进一步改进，绝缘纸板筒采用基于纳米改性的高击穿强度绝缘纸板制备方法制得的绝缘纸板制成，绝缘纸板筒为圆柱形纸板筒，将换流变压器出线装置结构中的导杆部置于在圆柱形纸板筒内。As a further improvement of the present invention, the insulating cardboard tube is made of insulating cardboard based on nano-modified high-breakdown strength insulating cardboard. The insulating cardboard tube is a cylindrical cardboard tube. The guide rod part is placed in a cylindrical cardboard tube.
本发明的有益效果是：The beneficial effects of the present invention are:
本发明的一种基于纳米改性的高击穿强度绝缘纸板筒中采用了经过表面修饰的纳米氧化铝或蒙脱土，通过提高绝缘纸板的直流、交流击穿场强和降低绝缘纸板的相对介电常数来提高换流变压器出线装置复合绝缘系统的电压等级和绝缘性能，延长其安全使用寿命，该发明易实现。本发明适用于换流变压器出线装置绝缘系统中，将出线装置结构中的均压球部外覆上由多层改性纸浆模压成的球形纸板筒，导杆部外覆上由多层改性纸浆模压成的圆柱形纸板筒，出线装置绝缘系统的绝缘水平将会大大提高，对于提高大型换流变压器的安全运行率和降低故障率都具有重要意义。A nano-modified high breakdown strength insulating cardboard tube of the present invention uses surface-modified nano-alumina or montmorillonite, by increasing the DC and AC breakdown field strength of the insulating cardboard and reducing the relative dielectric strength of the insulating cardboard The electrical constant is used to improve the voltage level and insulation performance of the composite insulation system of the converter transformer outlet device, and to prolong its safe service life. This invention is easy to realize. The invention is suitable for the insulation system of the outlet device of the converter transformer. The pressure equalizing ball part in the outlet device structure is covered with a spherical cardboard tube molded from multi-layer modified pulp, and the guide rod part is covered with a multi-layer modified pulp. The cylindrical cardboard tube made of pulp molded will greatly improve the insulation level of the insulation system of the outlet device, which is of great significance for improving the safe operation rate of large-scale converter transformers and reducing the failure rate.
附图说明：Description of drawings:
图1为球形纸板筒的结构示意图；Fig. 1 is the structural representation of spherical cardboard tube;
图2为圆柱形纸板筒的结构示意图；Fig. 2 is the structural representation of cylindrical cardboard tube;
图3为图1的俯视图；Fig. 3 is the top view of Fig. 1;
图4为图2的俯视图；Fig. 4 is the top view of Fig. 2;
图5为浸油改性绝缘纸板相对于浸油空白纸板直流、工频击穿场强以及相对介电常数增加或降低的比例柱状图；Figure 5 is a histogram of the increase or decrease in the ratio of the oil-impregnated insulating paperboard to the oil-impregnated blank paperboard for DC, power frequency breakdown field strength and relative permittivity;
图5中：c-纳米氧化铝改性绝缘纸板、d-蒙脱土改性绝缘纸板、X-直流击穿场强增加比例、Y-工频击穿场强增加比例、Z-相对介电常数降低比例。In Figure 5: c-nano-alumina modified insulating paperboard, d-montmorillonite modified insulating paperboard, X-increasing ratio of DC breakdown field strength, Y-increasing ratio of power frequency breakdown field strength, Z-relative permittivity Reduce the ratio.
具体实施方式：detailed description:
以下结合附图对本发明的具体实施方式进行详细的描述：The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:
所述的纳米改性绝缘纸板的制备步骤如下：将电工级未漂针叶木材硫酸盐纸浆通过碎浆机碎解后送至磨浆机磨浆，用标准疏解器疏解处理磨浆后的液态纸浆，使其浓度浓缩至4.3％～4.8％的浓缩纸浆，同时将加入官能团改性剂的纳米氧化铝或蒙脱土改性剂溶剂在超声波清洗机中超声分散处理，使纳米氧化铝或蒙脱土在改性剂溶剂中的粒径维持在纳米级，然后将处理过的浓缩纸浆和进行表面修饰的纳米氧化铝或蒙脱土改性剂溶剂混合后用增力电动搅拌机搅拌至完全混合均匀，再使用纸样抄取器对混合改性剂的浓缩液态纸浆进行抄取成型，在水分达到40％～50％时取出湿纸页，送至平板硫化机用15MPa的压力将湿纸页压榨制成15％～20％含水量的含水纸板后，用纸样抄取器以95℃的温度对纸板真空干燥处理成纳米改性绝缘纸板，纸板筒由多层改性纸板制成。The preparation steps of the nano-modified insulating paperboard are as follows: disintegrate electrical grade unbleached softwood kraft pulp through a pulper and then send it to a refiner for refining, and use a standard decomposer to decompose and treat the liquid pulp after defibrication. The pulp is concentrated to a concentration of 4.3% to 4.8%. At the same time, the nano-alumina or montmorillonite modifier solvent added with a functional group modifier is ultrasonically dispersed in an ultrasonic cleaning machine to make nano-alumina or montmorillonite The particle size of the soil in the modifier solvent is maintained at the nanometer level, and then the treated concentrated pulp and the surface-modified nano-alumina or montmorillonite modifier solvent are mixed and then stirred with a booster electric mixer until completely mixed, Then use a paper sample extractor to extract and form the concentrated liquid pulp mixed with modifiers. When the moisture reaches 40% to 50%, take out the wet paper sheet and send it to a flat vulcanizer to press the wet paper sheet with a pressure of 15 MPa. After the water-containing cardboard with 15% to 20% water content, the cardboard is vacuum-dried at a temperature of 95°C with a paper sampler to form a nano-modified insulating cardboard, and the cardboard tube is made of multi-layer modified cardboard.
参见图1、图3本发明的一种基于纳米改性的高击穿强度绝缘纸板筒是由基于纳米改性的高击穿强度绝缘纸板制备方法制得的绝缘纸板制成，所述的绝缘纸板筒为球形纸板筒a，可将换流变压器出线装置结构中的均压球部1外覆上球形纸板筒a。Referring to Fig. 1 and Fig. 3, a nano-modified high breakdown strength insulating paperboard tube of the present invention is made of insulating paperboard prepared by a nano-modified high breakdown strength insulating paperboard preparation method, and the insulating The cardboard tube is a spherical cardboard tube a, and the pressure equalizing ball part 1 in the structure of the converter transformer outlet device can be covered with a spherical cardboard tube a.
参见图2、图4本发明的一种基于纳米改性的高击穿强度绝缘纸板筒是由基于纳米改性的高击穿强度绝缘纸板制备方法制得的绝缘纸板制成，所述的绝缘纸板筒为圆柱形纸板筒b，可将换流变压器出线装置结构中的导杆部2外覆上圆柱形纸板筒b。Referring to Fig. 2 and Fig. 4, a nano-modified high breakdown strength insulating paperboard tube of the present invention is made of insulating paperboard prepared by a nano-modified high breakdown strength insulating paperboard preparation method. The cardboard tube is a cylindrical cardboard tube b, and the guide rod part 2 in the structure of the converter transformer outlet device can be covered with a cylindrical cardboard tube b.
参照附图5，对浸油改性绝缘纸板的直流和工频击穿场强进行测试，加入纳米改性剂溶剂后，浸油改性绝缘纸板的直流和工频击穿场强与浸油空白纸板相比有显著提高。由图5中X和Y左侧的柱形c所示的结果可以看出，纳米氧化铝改性绝缘纸板的直流击穿场强相对于浸油空白纸板增加6.61％，工频击穿场强相对于浸油空白纸板增加13.11％；由图5中X和Y右侧的柱形d所示的结果可以看出，蒙脱土改性绝缘纸板的直流击穿场强相对于浸油空白纸板增加2.36％，工频击穿场强相对于浸油空白纸板增加12.93％。Referring to Figure 5, the DC and power frequency breakdown field strengths of the oil-impregnated insulating paperboard were tested. Significant improvement compared to blank cardboard. From the results shown in the column c on the left side of X and Y in Figure 5, it can be seen that the DC breakdown field strength of the nano-alumina modified insulating paperboard is 6.61% higher than that of the oil-impregnated blank paperboard, and the power frequency breakdown field strength Compared with the oil-impregnated blank paperboard, it increased by 13.11%; from the results shown in the column d on the right side of X and Y in Figure 5, it can be seen that the DC breakdown field strength of the montmorillonite modified insulating paperboard increases compared with the oil-impregnated blank paperboard 2.36%, and the power frequency breakdown field strength increased by 12.93% relative to the oil-impregnated blank paperboard.
参照附图5，测量浸油改性绝缘纸板的相对介电常数，加入纳米改性剂溶剂后，浸油改性绝缘纸板的相对介电常数与浸油空白纸板相比有明显的降低。由图5中Z左侧的柱形c所示的结果可以看出，纳米氧化铝改性绝缘纸板比空白纸板的相对介电常数低17.65％；由图5中Z右侧的柱形d所示的结果可以看出，蒙脱土改性绝缘纸板比空白纸板的相对介电常数低14.52％。Referring to Figure 5, the relative permittivity of the oil-impregnated insulating paperboard was measured. After adding the nano-modifier solvent, the relative permittivity of the oil-impregnated insulating paperboard was significantly lower than that of the oil-impregnated blank paperboard. From the results shown in the column c on the left side of Z in Figure 5, it can be seen that the relative dielectric constant of the nano-alumina modified insulating paperboard is 17.65% lower than that of the blank cardboard; as shown by the column d on the right side of Z in Figure 5 From the results shown, it can be seen that the relative dielectric constant of the montmorillonite modified insulating paperboard is 14.52% lower than that of the blank paperboard.
虽然本发明所揭示的实施方式如上，但其内容只是为了便于理解本发明的技术方案而采用的实施方式，并非用于限定本发明。Although the embodiments disclosed in the present invention are as above, the content thereof is only for the convenience of understanding the technical solutions of the present invention, and is not intended to limit the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610997352.8ACN106381750A (en) | 2016-11-14 | 2016-11-14 | Production method of high-breakdown-strength insulation paperboard based on nano modification and paperboard cylinder thereof |
| Application Number | Priority Date | Filing Date | Title |
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| CN201610997352.8ACN106381750A (en) | 2016-11-14 | 2016-11-14 | Production method of high-breakdown-strength insulation paperboard based on nano modification and paperboard cylinder thereof |
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| CN106381750Atrue CN106381750A (en) | 2017-02-08 |
| Application Number | Title | Priority Date | Filing Date |
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| CN201610997352.8APendingCN106381750A (en) | 2016-11-14 | 2016-11-14 | Production method of high-breakdown-strength insulation paperboard based on nano modification and paperboard cylinder thereof |
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| CN104091682A (en)* | 2014-07-29 | 2014-10-08 | 哈尔滨理工大学 | Converter transformer wire outlet device based on nano-modification nonlinear insulating paper boards |
| CN104131494A (en)* | 2014-07-29 | 2014-11-05 | 哈尔滨理工大学 | Nonlinear insulation board based on nano modification and preparation method thereof |
| WO2016112523A1 (en)* | 2015-01-16 | 2016-07-21 | 阿尔斯通技术有限公司 | Nanometer aluminium oxide modified insulation paper and preparation method thereof |
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| CN105696408A (en)* | 2016-04-05 | 2016-06-22 | 哈尔滨理工大学 | Nano modified paper based on surface modification and preparation method thereof |
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