Suzhou Electric Appliance Research Institute
期刊號： CN32-1800/TM| ISSN1007-3175

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單層油紙絕緣結構合成電場數(shù)值計算

來源：電工電氣發(fā)布時間：2022-09-26 15:26 瀏覽次數(shù)：388

單層油紙絕緣結構合成電場數(shù)值計算

田雨，馬思思，夏東，周斌，沈衛(wèi)剛
(國網(wǎng)江蘇省電力有限公司蘇州供電分公司，江蘇 蘇州 215008)
 
    摘 要：直流電壓下?lián)Q流變壓器閥側油紙絕緣介質中存在空間電荷的積聚，對其結構內部的電場分布造成影響?？紤]了異極性空間電荷間的復合以及入陷、脫陷效應，采用有限元法求解泊松方程和電流連續(xù)性方程，基于多物理場耦合迭代的思想實現(xiàn)了單層油紙絕緣介質中空間電荷運動特性及瞬態(tài)電場分布的動態(tài)仿真?？紤]系統(tǒng)潮流反轉的情況，模擬了電壓極性反轉條件下油紙絕緣結構內部合成電場的變化過程，計算結果表明：極性反轉瞬間，油紙絕緣介質中空間電荷造成的附加影響使得極板處電場強度急劇增高，電場畸變率高達56.3%，嚴重危及介質絕緣性能，研究內容為換流變壓器內絕緣結構優(yōu)化設計提供了參考依據(jù)。
    關鍵詞： 合成電場；油紙絕緣；有限元法；空間電荷；電場畸變
    中圖分類號：TM403.3     文獻標識碼：A     文章編號：1007-3175(2022)09-0018-07
 
Numerical Calculation of Synthetic Electric Field in Single-Layer
Oil Paper Insulation Structure
 
TIAN Yu, MA Si-si, XIA Dong, ZHOU Bin, SHEN Wei-gang
（Suzhou Power Supply Company, State Grid Jiangsu Electric Power Co., Ltd, Suzhou 215008, China）
 
    Abstract: The accumulation of space charges in the oil paper insulation medium on the valve side of the converter transformer under DC voltage affects the electric field distribution inside the structure.This paper considered the recombination of space charges of different polarities and the effects of trapping and de-trapping, used the finite element method to solve the poisson equation and the current continuity equation,and realized the dynamic simulation of space charge motion characteristics and transient electric field distribution in a single-layer oil paper insulation medium based on the coupling of multi-physical field iteration idea. Moreover, it reflected the power flow reversal of the system. In addition, it simulated the change process of the synthetic electric field inside the oil paper insulation structure under the voltage polarity reversal.The result calculation showed that the electric field intensity at the plate increased sharply and the electric field distortion rate was up to 56.3% because of the additional influence space charge in the oil paper insulation.The effect jeopardized the dielectric insulation performance.The research provides a reference for the optimization design of the internal insulation structure of the converter transformer.
    Key words: synthetic electric field; oil paper insulation; finite element method; space charge; electric field distortion
 
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