摘要
为研究不同老化状态下油纸绝缘沿面放电的发展特性,分析老化程度对放电特性的影响,进而提出表征老化程度和放电危险度的特征量。通过加速热老化制备了4种不同老化程度的油纸绝缘试品,在阶升电压下获得了其局部放电发展过程中的谱图和脉冲序列特性。研究发现,沿面放电脉冲多以脉冲簇群形式出现且有脉冲幅值逐渐增大,脉冲波形上升沿、下降沿快于空气中放电的情形;油纸绝缘老化程度对沿面放电的起始电压和击穿电压影响不大,但对放电量的威布尔尺度参数α值和平均放电功率P影响显著;连续放电时间差Δt对放电发展阶段和绝缘老化程度反应灵敏,可用于放电危险度评估指标。
The main aim of this paper is to investigate the evolutionary characteristics of surface discharge within the oil-paper insulation under the different aging conditions and extract parameters which are capable of characterizing the risk of discharge events. Oil-paper specimens of four kinds of different aging intervals are obtained through thermally accelerating aging processes and the developing processes of partial discharge (PD), and pulse sequences are acquired under step-up applied AC voltage. The results show that the current pulses of the surface discharge usually appear in sequence with growing amplitude and the rise/fall time of pluses are faster than the counterparts in gas. The aging conditions of specimens hardly affect the partial discharge inception voltage (PDIV) and breakdown voltage (BDV), however, the parameters P and a are sensitive to the oil/paper conditions. The interval between consecutive discharges, Δt, is strongly dependent on discharge stage and aging condition of the insulation, and it can be used as the key parameter to the risk assessment of the PD.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第3期923-930,共8页
High Voltage Engineering
基金
国家自然科学基金(51607139
51521065)
中央高校基本科研业务费专项资金(Xjj2016012)
电力设备电气绝缘国家重点实验室资助项目(EIPE17316)
中国博士后科学基金资助项目(2016M600793)~~
关键词
油纸绝缘
沿面放电
老化状态
危险性评估
特征量
oil-paper insulation
surface discharge
ageing condition
risk assessment
characteristic quantity