Retracted: Nondestructive Evaluation And Fault Diagnosis Methods For Substation Grounding Grids: The State Response Analysis

Nowadays, the nondestructive evaluation and fault diagnosis methods (NEFDM) used and investigated popularly for power substation grounding grids are mainly the standard grounding impedance detection (SGID), equivalent network resistances measurement (ENRM), magnetic induction intensity recording (MIIR), ultrasonic guided-wave detection (UGVD) and electrochemical analysis of grounding corrosion (EAGC). Those NEFDM methods have their own advantages and disadvantages, the parameters of the measurement are different, and can not replace each other. In this paper, the state response analysis method (SRAM) based on the input current and output voltage signals of the power substation grounding grids is introduced as an attempt. Based on different input current, three methods with analysis of impedance and amplitude-frequency response under swap frequency current, impulse current and M-sequence current are given, respectively. The discussion results show that it could be a research topic worthy of future development.