特高压交流变压器送电调试过程电流规律研究  

Study on the Current Law of UHV Transfomer During System Commissioning

作　　者：齐志强 李聪聪 李玉敦 QI Zhiqiang;LI Congcong;LI Yudun(State Grid Shandong Electric Power Company,Jinan 250001,China;State Grid Shandong Electric Power Research Institute,Jinan 250003,China)

机构地区：[1]国网山东省电力公司,山东济南250001 [2]国网山东省电力公司电力科学研究院,山东济南250003

出　　处：《山东电力技术》2023年第8期42-49,共8页Shandong Electric Power

摘　　要：特高压交流变压器因为主体变压器和调压补偿变压器两部分导致结构更为复杂,准确掌握送电时特高压变压器电流规律是进行保护方向校核的关键。建立特高压变压器单相等效计算模型,利用绕组磁势平衡原理分析变压器各侧绕组电流数值关系,建立各侧绕组电流关联模型。基于该模型分析特高压变压器保护电流可以快速确定二次电流方向,从而实现特高压变压器继电保护方向的校验。最后,通过实际带负荷试验验证了该模型的正确性。针对结构复杂的特高压变压器调试需求,详细分析特高压变压器送电调试过程中主体变压器和调压补偿变压器保护电流互感器TA测量电流的大小及方向,提出保护TA极性确定方法。研究成果可为特高压交流设备选型和工程设计提供参考依据。The UHV transformer includes two parts:the main transformer and the voltage regulating compensation transformer,so its structure is more complex.Accurately grasping the current law of the UHV transformer during power transmission is the key to verifying the protection direction.A single-phase equivalent calculation model for UHV transformers was established,and the numerical relationship of winding currents on each side of the transformer was analyzed using the principle of winding magnetic potential balance.A correlation model of winding currents on each side was established.By using the established model to analyze the protection current of ultra-high voltage transformers,the direction of secondary current can be quickly determined,thus achieving verification of the relay protection direction of ultra-high voltage transformers.Finally,the correctness of the model was verified through actual load testing.According to the debugging requirements of UHV transformers with complex structure,the magnitude and direction of the main transformer and voltage regulation compensation variable protection TA measurement current during the commissioning process of UHV transformer power transmission were analyzed in detail,and a method for determining the polarity of protection TA was proposed.The research results can provide reference for the selection and engineering design of UHV transformers equipment.

关 键 词：特高压变压器 送电调试 二次电流 保护方向校验 

分 类 号：TM41[电气工程—电器]