不同型式主变压器联合运行电气特征量分析及继电保护配置研究  

Analysis of Electrical Characteristics of Combined Operation of Main Transformers from Different Types and Research on Relay Protection Configuration

作　　者：李吉生[1] 桂林[2] 徐小明 王祥珩[2] LI Jisheng;GUI Lin;XU Xiaoming;WANG Xiangheng(Daya Bay Nuclear Power Operation Management Co.Ltd.,Shenzhen 518124,China;State Key Laboratory of Control and Simulation of Power System and Generation Equipment,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]大亚湾核电运营管理有限责任公司,广东省深圳市518124 [2]清华大学电机工程与应用电子技术系,北京市100084

出　　处：《水电与抽水蓄能》2022年第4期107-114,共8页Hydropower and Pumped Storage

基　　金：国家自然科学基金项目“电容电流剧增条件下大型发电机定子接地故障分析与优化设计研究”(52077115)。

摘　　要：某电厂主变压器(三相变压器组)拟对C相进行单独更换,由于新C相与旧A/B相的阻抗及对地电容值存在差异,需要对主变压器新C相与旧A/B相联合运行下的电气特征量变化进行理论推导和仿真分析,校核与过电流保护相关的三相电流不平衡度,以及与定子接地保护相关的位移电压的变化等,以确定相关继电保护配置及定值整定的应对措施,为后续主变压器C相更换的实施提供决策依据。上述做法将为后续电站类似技改工作提供借鉴。A power plant plans to separately replace phase C of the main transformer(three-phase transformer bank).Due to the difference between the impedance and ground capacitance of the new phase C and the original phase A and B,it is necessary to calculate and analyze the change of electrical characteristics under the combined operation of the new phase C and the original phase A and B of the main transformer,check the three-phase current imbalance related to overcurrent protection and the change of displacement voltage related to stator grounding protection,so as to determine the countermeasures for relevant relay protection configuration and setting calculation.In addition,it can provide reference for similar technical improvement work of subsequent power stations.

关 键 词：主变压器 阻抗与对地容抗差异 电气特征量变化 继电保护配置 定值整定 

分 类 号：TM411[电气工程—电器]