朱庆东,李龙龙,朱孟兆,朱文兵,王建,辜超,顾朝亮
ZHU Qingdong,LI Longlong,ZHU Mengzhao,ZHU Wenbing,WANG Jian,GU Chao,GU Chaoliang

• 1:国网山东省电力公司电力科学研究院

摘要(Abstract)：

内部短路等引起的电弧放电是特高压变压器最为严重的故障之一，容易造成油箱变形破裂甚至起火爆炸。为了分析电弧放电引起的变压器应力应变水平，建立了1 000 kV单相特高压变压器有限元模型，仿真分析了特高压变压器内部不同部位、不同能量的电弧放电引起的油箱压力分布，计算了油箱和螺栓的应力应变水平，结合材料参数对油箱和螺栓的力学性能进行安全校核，并给出了箱壁破裂或螺栓损伤的放电能量阈值。结果表明：油箱内高压绕组附近电弧放电时最大应力出现在箱壁拐角处，最大形变出现在长轴侧箱壁中间部位；升高座内电弧放电时最大应力出现在升高座支架处，最大形变出现在升高座拐弯处。
Arc discharge caused by short-circuit faults is one of the most serious faults in UHV transformers, with the potential for inducing deformation, rupture, burning, or even explosion of the oil tank. In order to analyze the stress-strain levels induced by arc discharge in transformers, a finite element model for a 1,000 kV single-phase UHV transformer was established. The simulation and analysis focused on the pressure distribution within the oil tank caused by arc discharge at different locations and energy levels. Stress-strain levels in both the oil tank and bolts were calculated, with a comprehensive safety check on their mechanical properties based on material parameters. Additionally, the discharge energy thresholds leading to tank wall rupture or bolt damage were determined.The findings reveal that the maximum stress during arc discharge near the high-voltage winding in the oil tank is located at the corner of the tank wall, and the maximum deformation is observed in the middle of the tank wall along the long axis. Furthermore, the maximum stress during arc discharge inside the lifting seat is concentrated at the support of the elevated seat, with the maximum deformation observed at the turning point of the elevated seat.

关键词(KeyWords)： 特高压变压器;电弧放电;油箱;螺栓;应力;应变;安全校核
UHV transformer;arc discharge;oil tank;bolt;stress;strain;safety check

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目（51977017）;; 国网山东省电力公司科技项目（5206002000VF）

作者(Author): 朱庆东,李龙龙,朱孟兆,朱文兵,王建,辜超,顾朝亮
ZHU Qingdong,LI Longlong,ZHU Mengzhao,ZHU Wenbing,WANG Jian,GU Chao,GU Chaoliang

DOI: 10.19585/j.zjdl.202401014

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