打浆度对超高压绝缘纸老化性能的影响

Effect of Beating Degree on Aging Property of Ultrahigh Voltage Insulating Paper

关键词:  绝缘纸  打浆度  老化  机械性能  电气性能

Key Words:insulating paper  beating degree  aging  mechanical properties  electrical properties

摘要:选用俄罗斯云杉进行硫酸盐法蒸煮并纯化制备绝缘浆，进一步得到不同打浆度绝缘纸，对比其不同老化时间下纤维特性及绝缘纸机械和电气性能差异，研究打浆度对绝缘纸老化性能的影响。结果表明，随着打浆度升高，纤维长度和孔隙率降低，细小纤维含量增加，纤维分丝帚化率和弯曲扭结率增大；老化后纤维长度显著降低，低打浆度折断纤维和细小纤维含量越大。随着老化时间延长，不同打浆度绝缘纸性能差距增大；随老化时间延长，高打浆度绝缘纸机械性能和电气性能降低幅度更小，性能更稳定。当打浆度提高到83 °SR时，热压后绝缘纸的抗张强度达到17.5 kN/m，老化30天后纤维聚合度仍能保持在500左右，且打浆度为83 °SR油纸绝缘材料击穿强度远大于其他较低打浆度油纸绝缘材料，介电常数和介质损耗均低于其他较低打浆度油纸绝缘材料。

Abstract:In order to study the effects of beating degree on the aging properties of insulating paper， Russian spruce was taken up sulfate cooking and purification to obtain the insulating pulp. The insulating paper with different beating degree was further prepared. The results showed that with the increase of beating degree， the fiber length and porosity decreased， the content of fine fiber increased， and the fiber splitting and and kink ratio increased. The fiber length decreased significantly after aging， and the content of broken fiber with low beating degree and fine fiber increased. With the aging time prolonging， the performance vaviance of insulating paper with different beating degrees increased. With the extension of aging time， the mechanical and electrical properties of high beating degree insulating paper were reduced less， and the performance was more stable. When the beating degree was increased to 83 °SR， the tensile strength of the insulating paper after hot pressing reached 17.5 kN/m， the fiber polymerization degree could still be maintained above 500 after 30 days of aging， the breakdown strength of oil insulating paper was much higher than that of other oil insulating paper， and the dielectric constant and dielectric loss were lower than those of other oil insulating paper.