TiO2纳米粒子几何形貌对冲击电压下变压器油中流注发展速度的影响  

Influence of TiO Nanoparticle’s Geometry on Propagation Velocity of Streamers in Transformer Oil Under Impulse Voltage

作　　者：黄猛 葛扬[1] 单秉亮 牛铭康 应宇鹏 吕玉珍[2] HUANG Meng;GE Yang;SHAN Bingliang;NIU Mingkang;YING Yupeng;Lü Yuzhen(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power Univcrsity,Beijing 102206,China;School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《高电压技术》2020年第11期3986-3993,共8页High Voltage Engineering

基　　金：国家自然科学基金(51807062,51337003);电力系统国家重点实验室资助课题(SKLD17KZ01)。

摘　　要：冲击电压下流注的发展速度是衡量纳米改性变压器油绝缘性能的一个重要指标,也是分析纳米变压器油改性机理的关键参数,但是现有研究中大多聚焦于冲击电压下的击穿电压和击穿时间。为此,搭建了基于纹影法的流注高清拍摄平台,拍摄了不同形状、不同尺寸TiO2纳米粒子改性变压器油在正极性雷电冲击电压下的流注发展过程,分析流注发展速度的变化规律,揭示其与陷阱之间的关系。结果表明,纳米粒子的几何形貌改变可以明显影响纳米变压器油中流注的发展。棒状纳米粒子使得变压器油中流注发展速度更慢,对流注的抑制作用更明显。同时,随着纳米粒子尺寸的减小,纳米变压器油中流注发展速度变慢,从而抑制了流注的发展。分析表明,TiO2纳米粒子几何形貌对陷阱特性的影响是引起流注发展速度变化的根本原因。The propagation velocity of streamer under impulse voltage is an important index to the insulation performance of nano-modified transformer oil and a key parameter for analyzing the modification mechanism. However, most of the existing studies only focus on the breakdown voltage and breakdown time. Therefore, a high quality shooting platform for streamer was built based on Schlieren method. The development of streamers in modified transformer oil by TiO2 nanoparticles with different shapes and sizes was measured under positive lightning impulse voltages, and then their propagation velocities were calculated to reveal the relation between trap characteristics and streamer propagation velocity. The results show that the change of nanoparticle’s geometrical morphology can obviously affect streamer’s development in nano-transformer oil. Rod-like nanoparticles make streamers propagate slower in transformer oil and thus inhibit them. Meanwhile, with the decrease of nanoparticles’ size, streamers’ propagation velocity becomes smaller and their development is suppressed. The reason for this variation of streamer’s velocity is attributed to the influence of TiO2 nanoparticles’ geometrical morphology on trap characteristics.

关 键 词：纳米粒子 雷电冲击电压 流注 发展速度 几何形貌 陷阱 

分 类 号：TM40[电气工程—电器]