Research on breakdown characteristics of converter transformer oil-paper insulation under compound electric field in alpine region

2nd International Conference on New Material and Chemical Industry

材料科学;化学工业

Xu, C.^1 ; Gao, Z.W.^1 ; Lan, S.^1 ; Guo, H.X.^1 ; Gong, M.C.^1

State Grid Heilongjiang Electric Power Company Limited Electric Power Research Institute, 7 Xiangjiang River Road, Harbin, China^1

关键词: Breakdown characteristics;    Converter transformers;    Field intensity distribution;    Flashover characteristics;    Insulation structures;    Operation temperature;    Reliability of transformers;    Space-charge accumulation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/292/1/012010/pdf
DOI  :  10.1088/1757-899X/292/1/012010

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In the paper, existing research and operating experience was summarized. On the basis, the particularity of oil-paper insulation operation condition for converter transformer was combined for studying the influence of temperature on oil-paper insulation field intensity distribution of converter transformers under different AC contents within wide temperature scope (-40°C∼105°C). The law of temperature gradients on space charge accumulation was analyzed. The breakdown or flashover characteristics of typical oil-paper compound insulation structure under the action of DC, AC and AC-DC superposition voltage at different temperatures were explored. The design principles of converter transformer oil-paper insulation structures in alpine region was proposed. The principle was adjusted and optimized properly according to the operation temperature scope and withstood AC-DC proportion. The reliability of transformer operation was improved on the one hand, and the insulating medium can be rationally utilized for reducing the manufacturing cost of the transformer on the other hand.