UHV串联式TV高压隔离部分的有限元分析及优化

FEA and Optimization Design of High Voltage Isolation Transformer in UHV Series TV

用于超高压和特高压的电压互感器可采用多台电压互感器在一次侧和二次侧串联实现,一次绕组的串联结构与传统的串级结构相似,二次侧的串联结构需要使用高压隔离电压互感器,目前这种互感器还没有设计的经验。为此以1 000 kV串联式标准电压互感器为例,用有限元分析软件ANSYS对高压隔离互感器的三维电场分布进行了数值模拟计算和性能优化。结果表明,基于有限元法的数值模拟是分析和设计串联式电压互感器的有效手段,经优化设计后的高压隔离互感器能够同时满足绝缘和精度方面的要求,优化结果为更高电压等级的串联式电压互感器的设计和制造提供了可靠的、科学的数据。

Voltage transformers used in extra-high voltage（EHV）and ultra-high voltage（UHV） can be designed in series structure.The arrangement of primary windings is conventional.The series circuits of secondary voltages need high voltage isolating transformers.So far the experience of designing series voltage transformers remains in lack.In this paper the design of 1 000 kV series voltage transformers was discussed.Numerical simulation and performance optimization are carried out via three-dimensional electric field distribution calculation with the help of software ANSYS,which based on finite element analysis（FEA）.Result shows the numerical simulation based on FEA is an effective method to analyze and design series voltage transformers.After optimization the high voltage isolating transformers can meet the requirement both in insulation and accuracy.It also expected that the research would supply useful and reliable data to the project of other series voltage transformers with higher voltage.