一种越级降压变压器高压线圈优化及仿真分析

Optimization and Simulation Analysis of High Voltage Coil for a Bypass Step Down Transformer

小容量220 kV高电压越级降压变压器高压线圈的设计形式不仅影响自身的能耗等级,还决定了整个变压器的绝缘质量。本文介绍对一台4000 kV·A越级降压变压器高压线圈所进行的优化设计,在满足用户能耗的基础上,对采用饼式结构与圆筒式结构的绕组进行对比,在端部均加强了主绝缘裕度,使其运行更加安全节能。同时,利用有限元仿真软件对该变压器建立三维仿真计算模型,通过型式试验模型进行仿真验证,找出其绝缘薄弱环节,最终得出结论:此类变压器高压线圈圆筒式结构更可靠、更能满足安全运行要求。

The form for design of high voltage coils of high voltage bypass step down transformer with small capacity of 220 kV not only affects its own energy consumption level,but also determines the insulation quality of the entire transformer.The paper introduces an optimized design of high voltage coil of a bypass step down transformer with capacity of 4000 kV·A,with meeting the user's requirements of energy consumption as the basis,comparison is made between pie structure winding and cylinder structure winding,and main insulation margin is strengthened at both ends so as to let it operate more safer and more efficiently in energy saving.At the same time,a three-dimensional simulation calculation model of the transformer is established by application of finite element simulation software,and the insulation weak links are identified through simulation verification of the type test model.Finally,the conclusion is made that the cylinder structure winding of the high-voltage coil of this type of transformer is more reliable and can better meet the requirements of safe operation.