Research On Transient Based Protection In EHV Transmission Lines Based On Wavelet Entropy

The reliability of HV/EHV transmission line protection is important to the security of the power system,This thesis is devoted in the study of the transient current protection for HV/EHV transmission line. Electric power transient signal analysis is the basis of realizing transient based protection, In order to ensure protectors correct operation, it's necessary for finding an appropriate right quantum to detect kinds of faults and differentiate internal faults and external faults. So it's important to build a suit of efficient methodology used in detection and analysis. In this thesis, the main introduction is the wavelet entropy and its application to the transient signal processing, ATP simulation results of different fault inception angles and fault resistances prove that wavelet energy entropy is possibility in transient based protection. Zhao Yu-Long(Power System and Its Automation)...