High voltage transmission line protection principle using transient signals

2018 International Conference on Civil, Architecture and Disaster Prevention

土木建筑工程

Hu, Liexiang^1 ; Qiu, Yutao^1 ; Jiang, Lihui^2 ; Ren, Jianguo^2 ; Wang, Song^1 ; Qi, Xuanwei^1 ; Wu, Jiayi^1

State Grid Zhejiang Power Co. Ltd., Hangzhou, Zhejiang

310007, China^1

China Resources Power Holdings Co. Ltd., Shenzhen, Guangdong

518001, China^2

关键词: EHV transmission line;    Engineering implementation;    High voltage transmission lines;    Multi-resolution morphological gradient;    Multi-scale wavelet;    Transient current signals;    Transient protection;    Transition resistance;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/218/1/012065/pdf
DOI  :  10.1088/1755-1315/218/1/012065

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Based on the concept of multi-resolution morphological gradient (MMG) in mathematical morphology, a new scheme of single-ended transient protection is proposed. On the basis of MMG, the window function energy spectrum of the transient current signal generated by the fault is extracted to realize the identification of faults in the area and outside. A typical 500 kV EHV transmission line is selected and simulated by PSCAD/EMTDC. The results show that the scheme is not affected by fault type, fault location, transition resistance and initial phase angle. At the same time, the calculation amount of the algorithm is smaller than that of the multi-scale wavelet transform, which is beneficial to engineering implementation.