换流变压器下新型纤维素绝缘纸特性综述

发布时间：2018-04-27 15:42

本文选题：换流变压器 + 纤维素绝缘纸　；参考：《电工技术学报》2016年10期

【摘要】：换流变压器是高压直流输电网络的关键设备之一,其阀侧主绝缘由于运行工况电场情况复杂通常具有较高的故障率。虽然通过在线监测及故障诊断技术手段可以提高绝缘可靠性,但若考虑到停电维修所带来维修和输电损失成本,高压直流输电网络运行有效性和经济性并不能得到有效保证。油纸绝缘作为换流变压器阀侧的主要绝缘形式,其绝缘可靠性与换流变压器安全运行紧密相关。其中在阀侧处构成固体绝缘的绝缘纸不仅长期受到热应力作用造成绝缘劣化,同时还承受交直流叠加和极性反转等复杂电场作用,容易积聚空间电荷、承受更多的直流场强分量,并且其在劣化后引起的性能下降是不可逆转的,因此绝缘纸的性能是决定换流变压器运行可靠性的重要因素。为了保障换流变压器安全可靠运行,结合国内外文献及课题组相关研究成果,旨在从提升纤维素绝缘纸的抗热老化性能、耐绝缘击穿特性以及空间电荷分布特性三大方面阐述当前采用改性技术提升绝缘纸性能的研究现状,分析各改性方法的利弊,探究经济可行的纤维素绝缘纸改性方法,从本质上提升换流变压器运行可靠性。
[Abstract]:The converter transformer is one of the key equipment of HVDC transmission network. The main insulation of the valve side is usually high failure rate due to the complicated electric field in the operating condition. Although the on-line monitoring and fault diagnosis technology can improve the insulation reliability, the maintenance and transmission cost of the power outage maintenance will be taken into account, and the high voltage is taken into account. The efficiency and economy of the DC transmission network can not be effectively guaranteed. As the main insulation form of the valve side of the converter transformer, the insulation reliability of the oil paper insulation is closely related to the safe operation of the converter transformer. It is also subjected to complex electric fields such as alternating current and direct superposition and polarity reversal. It is easy to accumulate space charge and withstand more DC field strength, and its performance decline after deterioration is irreversible. Therefore, the performance of insulation paper is an important factor determining the operation reliability of converter transformer. In order to ensure the safety of converter transformer, By running, combining the related research results of domestic and foreign literature and project group, this paper aims to elaborate the current research status of improving insulation paper performance by using modified technology from three aspects of improving thermal aging properties of cellulose insulating paper, insulation breakdown characteristics and space charge distribution characteristics, analyzing the advantages and disadvantages of various modification methods and exploring the feasibility of economic feasibility. The modification method of cellulose insulation paper improves the operational reliability of converter transformer in essence.

【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);中国电力科学研究院;
【基金】：国家自然科学基金(51437001) 国家创新研究群体基金(51321063)资助项目
【分类号】：TM721.1;TM855

【参考文献】