At 6:03 on July 31, 220kV auxiliary power supply reverse work of Unit 1 and Unit 2 of Zhangzhou Nuclear power Plant was successfully completed, marking the realization of the first commissioning milestone node of the mass construction of "Hualong One" first reactor project, and the "Hualong mass construction" project has entered the phase of subsystem commissioning.
220kV auxiliary power supply reverse power supply is a new nuclear power plant after the installation of unit equipment and line erection work, through the transmission line from the grid to the plant for power supply, in order to meet the start-up requirements of high-power equipment during system commissioning. The realization of this node indicates that the system and equipment at the site of Zhangzhou nuclear power project will obtain stable debugging and temporary operation power supply, and provide reliable power supply guarantee for the subsequent comprehensive debugging work.
The 220kV auxiliary power supply reverse transmission process includes fire connection, line and auxiliary transformer impact test and other links. The auxiliary transformers of Unit 1 and Unit 2 of Zhangzhou Nuclear Power Plant have passed five impact tests. The parameters meet the standard requirements and the equipment runs stably. The on-load voltage regulation test, 10kV bus impact and load check were all successful once, indicating that the power back-off work was completed and the system entered the 24-hour trial operation safely. The first batch project of Hualong One -- Zhangzhou Nuclear Power Unit 1 has officially entered a new stage of system commissioning.