摘要
针对纵联差动保护误动情况较多,大容量单相发电机主变压器运行灵敏度与安全性较低的问题,该文研究了大容量单相发电机主变压器纵联差动保护的自适应控制模型。采用二次谐波制动方法,减少纵联差动保护误动行为;基于纵联差动保护区内外短路时故障电流的特性,构建纵联差动保护的自适应控制模型,实时改变主变压器纵联差动保护的制动系数,优化主变压器纵联差动保护逻辑。实验结果表明,运行灵敏度很高,可在保护区内及保护区外,准确定位大容量单相发电机主变压器的故障位置,在不同情况下均可做出保护动作,不发生误动情况。
The adaptive control model of pilot differential protection for large single-phase generator main transformer is studied to solve the problems of many misoperations of pilot differential protection and low operation sensitivity and security of large single-phase generator main transformer. The second harmonic restraint method is adopted to reduce the misoperation of longitudinal differential protection. Based on the characteristics of fault current during short circuit inside and outside the longitudinal differential protection area,an adaptive control model of longitudinal differential protection is built to change the braking coefficient of longitudinal differential protection of main transformer in real-time and optimize the logic of longitudinal differential protection of main transformer. The experimental results show that the operation sensitivity is very high,and the fault location of the main transformer of large capacity single-phase generator can be accurately located within or outside the protection zone,and the protection action can be made under different conditions without maloperation.
作者
尹羽
钱毅
YIN Yu;QIAN Yi(CHN ENERGY Zhejiang Electric Power Co.,Ltd.,Hangzhou 310020,China)
出处
《自动化与仪表》
2023年第3期22-26,共5页
Automation & Instrumentation
关键词
纵联差动保护
大容量发电机
主变压器
自适应
二次谐波
控制模型
longitudinal differential protection
large capacity generator
main transformer
adaptive
second harmonic
control mode
