Review of partial discharge detection technology for transient earth voltage of HV switchgear cabinet

The rapid and accurate detection of partial discharge (PD) in AC metal enclosed switchgear (switchgear cabinet) is of great significance to ensure the safe operation of power grid and improve the reliability of power supply. At present, the main methods used to detect PD signal in high voltage (HV) switchgear cabinet are transient earth voltage (TEV), ultra high frequency (UHF) and ultrasonic emission (AE). Based on a simple comparison of the above three methods, this paper reviews the TEV detection method which is widely used and has formed many standards. The physical principle, instrument composition and requirements of TEV detection method and field technical standards are summarized. The related applications including comprehensive application analysis, multi-technologies joint detection, discharge power verification and positioning, PD transmission simulation and robot application are introduced. Finally, the technology prospect of integrated composite sensor and Internet of things (IOT) is given.