油箱混合屏蔽结构对电力变压器损耗的影响分析

Analysis of the Impact of Oil Tank Mixed Shielding Structure on Power Transformer Losses

变压器损耗过大会引起的局部过热及绝缘老化等问题, 当油箱屏蔽设置不合理时会加剧此类现象, 针对这些问题本文提出了一种油箱混合屏蔽结构。文中对一台220kV变压器进行了三维模型构建, 并通过有限元仿真分别对单一材料及混合材料屏蔽下的变压器损耗分布进行了分析计算。经计算分析, 提出了一种混合屏蔽结构, 此种屏蔽结构在油箱处铺设铜屏蔽, 在此基础上增加了一层厚度为3mm的磁性屏蔽材料, 仿真发现混合屏蔽结构能够有效降低变压器杂散损耗。

Excessive transformer losses can cause local overheating, insulation degradation, and other issues. These effects are further aggravated when the oil tank shielding design is suboptimal. Regarding these issues, this paper proposes a hybrid shielding structure. A three-dimensional model of a 220kV transformer was constructed in the article, and the loss distribution of the transformer under single material and mixed material shielding was analyzed and calculated through finite element simulation. After calculation and analysis, a hybrid shielding structure was proposed, which involves laying copper shielding at the oil tank and adding a layer of magnetic shielding material with a thickness of 3mm. Simulation results showed that the hybrid shielding structure can effectively reduce transformer stray losses.