500 kV天然酯绝缘油变压器绝缘结构仿真优化

Simulation and optimization of insulation structure of 500 kV natural ester insulating oil transformer

基于矿物油的典型500 kV变压器绝缘结构直接用于天然酯绝缘油变压器时,存在绝缘薄弱点,需要对其进行改进。本研究通过增大主绝缘距离、加厚绕组绝缘及优化绕组纵向电容分布等方式,提升矿物油变压器绝缘结构方案的安全裕度,以形成500 kV天然酯绝缘油变压器绝缘结构设计方案,并对新方案进行主、纵绝缘仿真验证。结果表明:该方案满足绝缘设计要求,使用该方案研制的500 kV天然酯绝缘油变压器样机顺利通过全部绝缘试验。

When the typical insulation structure of 500 kV transformer based on mineral oil is directly applied to the natural ester insulating oil transformer,there are weak points of insulation that need to be improved.In this study,the safety margin of the insulation structure scheme for mineral oil was improved by increasing the main insulation distance,thickening the winding insulation,and optimizing the distribution of longitudinal capacitance of the winding.A designing scheme of insulation structure for 500 kV natural ester insulation oil transformer was formed,and simulation verification of the main insulation and longitudinal insulation of the new scheme was carried out.The results show that the scheme meets the insulation design requirements,the prototype of 500 kV natural ester insulating oil transformer developed with this scheme has successfully passed all the insulating tests.