变压器电压差动保护方法研究  

Research on the method of transformer voltage differential protection

作　　者：王雪[1] 王增平[1] 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,河北保定071003

出　　处：《电力系统保护与控制》2013年第4期67-72,共6页Power System Protection and Control

基　　金：国家自然科学基金项目(50777016);河北省教育厅指导性计划项目(Z2012063)~~

摘　　要：提出一种基于补偿电压的变压器电压差动保护。以单相双绕组变压器为例在正常变压器回路方程的基础上定义补偿电压的概念,并给出了三相变压器补偿电压的表达式。深入分析了变压器调压分接开关位置变化、漏电抗参数计算误差以及CT变换误差对基于回路方程差值的变压器保护以及补偿电压的幅值、相位的影响,在此基础上提出了综合补偿电压幅值和相位特征的变压器电压差动保护。利用ATP仿真软件获得变压器各种运行状态下的数据,分析结果表明了本方法的正确性和可行性。A novel transformer voltage differential protection based on the compensating voltages is presented. The concept of compensating voltage is defined based on the loop equation of a sound single-phase two-winding transformer, and then the expressions of compensating voltages of three-phase transformer are given. The influences on the amplitude and phase of compensating voltage and the protection of transformer based on the difference of loop equation of some conditions such as the change of tap position, computation error of leakage impedance and the transformation error of CT are analyzed deeply, and based on the above analysis the novel criterion of transformer voltage differential protection is presented, in which the amplitude and phase characteristics of compensating voltages are synthesized. The data of transformer under various conditions are obtained with ATP. The correctness and feasibility of the presented protection are proved by the analysis results.

关 键 词：变压器保护 回路方程 补偿电压 不平衡输出 ATP 

分 类 号：TM772[电气工程—电力系统及自动化]