【作者】 刘宇；

【导师】 王增平； 周济；

【作者基本信息】 华北电力大学（北京） ， 电气工程， 2009， 硕士

【摘要】 特高压变压器是特高压输电系统中最重要的设备之一,其运行状况对整个电力系统尤其是特高压系统的安全稳定运行起着关键性作用。研究特高压变压器保护的配置方案、励磁涌流识别和整定计算,对特高压系统运行具有重大现实意义。本论文根据特高压变压器的特殊结构,总结了特高压变压器保护功能总体配置方案:提出了特高压变压器可考虑配置分相差动加低压侧小区差动,分析了调压变压器和补偿变压器独立配置差动保护的必要性。论文重点分析了特高压变压器励磁涌流特点,提出了解决调压变压器励磁涌流的两种方法,一种从工程应用角度提出了消磁法,通过消磁来提高励磁涌流中二次谐波含量,避免空充时调压变压器差动保护误动;另外一种从励磁涌流识别判据角度,提出了新的综合的励磁涌流识别判据,并对新判据进行了动模试验和现场空充数据的回放试验,证明新的涌流识别判据是有效可行的。为了适应特高压变压器调压补偿变的结构、运行特点,提出调压补偿变保护的整定方案。更多还原

【Abstract】 UHV transformer is one of the most important equipments in the UHV system. The operation state of UHV transformer plays a key role for the security and stability of the entire power system,particularly UHV system.It is necessary and significant to study the UHV protection configuration,inrush recognition and setting calculation.The structure of UHV transformer is different from the traditional transformer.The overall configuration scheme is summarized.Phase differential protection and limit zone differential protection for low voltage side are configured for UHV transformer.It is concluded that voltage regulator and compensation transformer differential protection must be configured separately. Inrush characteristic for UHV transformer is analyzed.Two methods for solving inrush recognition are provided.The first is eliminating the remanence of the transformer so as to improve the 2^nd harmonic content.And then a new comprehensive inrush recognition method is provided,which is proved valid and feasible by the dynamic simulation and the UHV debugging waves replaying.In order to adapt to the structure and the operating characteristics of the regulator compensation transformer,the protection setting calculation scheme is provided.更多还原