摘要
本文开展了球-板和板-板电极下多元混合绝缘油和矿物油的雷电冲击击穿特性对比试验,采用第一性原理仿真分析了多元混合绝缘油和矿物油的雷电冲击放电过程微观参数在电场作用下的变化规律及差异。结果表明:球-板电极条件下,矿物油的正、负极性雷电冲击击穿电压分别比多元混合绝缘油高6.46%~23.63%和6.87%~23.08%;在板-板电极条件下,矿物油的雷电冲击击穿电压比多元混合绝缘油高7.64%~10.18%;多元混合绝缘油的放电发展速度比矿物油快,在小油隙条件下属于慢速流注;多元混合绝缘油的电离能、激发能均比矿物油低,这是多元混合绝缘油在放电过程中更容易产生电子和形成电子崩,进而增大碰撞电离概率的重要原因。
This paper conducted comparative experiments on the lightning impulse breakdown characteristics of multicomponent mixed insulating oil and mineral oil under ball-plate electrodes and plate-plate electrodes.First principles simulation was used to analyze the variation laws and differences of micro parameters during the lightning impulse discharge process of multi-component mixed insulating oil and mineral oil under the effect of electric field.The results show that under the condition of ball-plate electrode,the positive and negative lightning impulse breakdown voltages of mineral oil are 6.46%−23.63%and 6.87%−23.08%higher than those of multi-component mixed insulating oil,respectively.Under the condition of plate-plate electrode,the lightning impulse breakdown voltage of mineral oil is 7.64%−10.18%higher than that of multi-component mixed insulating oil.The discharge development speed of multi-component mixed insulating oil is faster than that of mineral oil,and it belongs to the category of slow flow streamers under small oil gap conditions.The ionization energy and excitation energy of multi-component mixed insulating oil are lower than those of mineral oil,which is an important reason why multi-component mixed insulating oil is more prone to generate electrons and form electron avalanche during discharge,thereby increasing the probability of collision ionization.
作者
钱国超
代维菊
叶文郁
郝建
QIAN Guochao;DAI Weiju;YE Wenyu;HAO Jian(Electric Power Research Institute of Yunnan Electric Power Grid Co.,Ltd.,Kunming 650217,China;State Key Laboratory of Power Transmission Equipment Technology,Chongqing University Chongqing 400044,China)
出处
《绝缘材料》
北大核心
2025年第12期120-127,共8页
Insulating Materials
基金
中国南方电网有限责任公司科技项目(YNKJXM 20210186)
国家自然科学基金创新研究群体项目(51321063)。
关键词
多元混合绝缘油
球-板电极
雷电冲击
第一性原理
矿物油
multi-component mixed insulating oil
ball-plate electrode
lightning impulse
first principles
mineral oil
