一种新型变压器稳态比率差动保护系数校验方法  

A novel calibration method of steady-state ratio differential protection coefficient for transformer

作　　者：王海波 WANG Haibo(State Grid Jiaxing Power Supply Company,Jiaxing,Zhejiang 314000)

机构地区：[1]国网浙江省电力有限公司嘉兴供电公司,浙江嘉兴314000

出　　处：《电气技术》2022年第10期80-85,共6页Electrical Engineering

摘　　要：针对幅值法校验变压器稳态比率差动保护系数计算量大、易出错、耗时长等缺点,提出一种通过在初始平衡态下改变变压器任一侧电流的相位产生差动电流从而精确获得保护动作点的方法,该方法具有制动电流恒定、计算量小、易操作、节省时间等优势。以RCS—978G变压器保护装置为试验对象,分析差动保护的幅值、相位及消零处理方式,总结幅值法校验步骤,给出所提相位法的原理及校验方法,最后通过试验对比分析幅值法与相位法的实际应用效果。结果表明,相位法在测量精度及校验耗时方面优势明显,具有推广价值。In view of the conventional calibration method of the power transformer steady-state ratio differential protection coefficient has the shortcomings of large computation, error-proneness and time-consuming, a novel calibration method by changing the current phase on either side of the main transformer to gain the differential current which can search the precise action point is proposed. The method has the advantages of small computation, easy operation and saving time. Taking the RCS-978G transformer as the test object, the magnitude adjustment, phase adjustment and zero elimination the of differential protection are analyzed. The test steps of the amplitude method are summarized. The principle and test method of the proposed phase method are given. Finally, the practical applications of the amplitude method and phase method are compared and analyzed. The results show that the phase method takes the obvious advantages in measuring accuracy and test time-consuming, and has the highly promotional value.

关 键 词：变压器 差动保护 比率制动 斜率 校验 

分 类 号：TM774[电气工程—电力系统及自动化]