November 9, State Grid Hunan maintenance company technicians are "high voltage AC-DC photoelectric current transformer board detection and fault diagnosis strategy" project to further improve and optimize. This project will fill the technical gap of the domestic HVDC photoelectric current transformer fault and improve the reliability of power supply. As the core measurement equipment of HVDC system, high current AC-DC photoelectric current transformer is widely used in DC system at State Grid. Its safe and stable operation is of great significance to the reliable power supply of DC system of DC system, especially DC-DC power system . Due to the complex structure and high failure rate of the transformer and its secondary circuit, the equipment needs to be removed from operation once a spare part is replaced in the event of a fault. However, the status of the power outage can not verify the quality of the new spare parts and can only be tested and affected in the running state Equipment operation reliability. In order to improve the quality of the equipment for maintenance and repair, the company conducted a research on the board detection and fault diagnosis strategy of HV AC / DC photoelectric current transformer, and provided a systematic method for typical fault handling of photoelectric current transformer which can be widely used This method can shorten the inspection, positioning and processing time of faults and improve the speed and accuracy of the fault analysis and checking of the photocurrent transformer in the converter station, so as to effectively reduce the number and the time of system temporary suspension and improve the system energy availability so as to realize Greatly improve the industry with the same type of equipment fault diagnosis and analysis capabilities to improve the quality of equipment maintenance, and further enhance the level of power grid operation and maintenance.