不同针叶木浆对变压器绝缘纸板性能的影响

Effect of Different Kraft Pulp on Performance of Insulating Pressboard of Power Transformer

绝缘纸板的质量对变压器的使用寿命影响很大,选取了加拿大HY,俄罗斯EKB,智利JX三种本色针叶木硫酸盐浆,研究三种针叶木浆对绝缘纸板性能的影响,研究结果表明,三种浆料的纤维的形貌有一定的差别,纤维的长度和宽度不尽相同,三种浆制备的绝缘纸板抗张强度和击穿电压都达到IEC标准,其中加拿大HY浆的性能最好。为优化最佳的性价比,三种浆料HY:EKB:JX配比为6:3:1时,绝缘纸板纵横向抗张强度比IEC标准最低值分别增加10.55%和12%;吸油率达17.53%;空气和油中的击穿强度分别增加21.5%和26.74%,较好满足绝缘纸板性能。

Power transformers are key elements in power systems. A power transformer lifetime is typically defined by the lifetime of the insulating pressboard in the transformer. To explore the effect of different Kraft pulp on the performance of insulating perssboard, three imported kinds of kraft pulp, namely, Canadian pulp HY, Russian pulp EKB, Chile Pulp JX, were used to prepare pressboard samples. The results show that there are some differences on fiber morphology, fiber length and width between them. The tensile strength and breakdown voltage of the pressboard prepared by three kinds of slurry all meet the IEC standard, among them, the Canada pulp HY has the best performance. For the optimal proportion, when the pulp HY：EKB：JX ratio was 6：3：1, the tensile strength in length and breadth than IEC standard were increased by 10.55% and 12% respectively; the oil absorption rate reaches 17.53%; the air breakdown voltage and oil breakdown voltage were increased by 21.5% and 26.74% respectively. It is better meet the properties of the pressboard.