Third-harmonic-based lightning arrester state evaluation method, system, equipment and medium

• Main Authors: ZHOU YUAN, WANG RUI, PENG XIANGYANG, WEI JUNTAO, FAN YAZHOU
• Format: Patent
• Language: Chinese; English
• Published: 02.05.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention relates to the technical field of power systems, in particular to a lightning arrester state evaluation method, system and device based on third harmonic and a medium, and the method comprises the steps: collecting a bus voltage signal of a lightning arrester and a leakage current flowing through a downlead of the lightning arrester; full-cycle Fourier transform is carried out on the at least two bus voltage signals, Fourier transform is carried out on the at least two leakage currents, and power grid resistive current third harmonics generated by system voltage third harmonics in the lightning arrester leakage currents are extracted; and eliminating the third harmonic interference of the resistive current of the power grid to obtain the nonlinear third harmonic current amplitude of the lightning arrester, and evaluating the state of the lightning arrester according to the nonlinear third harmonic current amplitudes of the lightning arrester obtained twice. According to the method, the third har