DL/T 259-2023 "Specification for calibration of sulfur hexafluoride gas density relays" specifies the calibration procedures and methods of sulfur hexafluoride gas density relays. The standard applies to the calibration of sulfur hexafluoride gas density relays used in power systems to ensure that their performance meets the design requirements and that the work is stable and reliable. The standard covers the preparation work before the calibration, the equipment and instruments used in the calibration, the detailed steps of the calibration process, and the data processing and evaluation after the calibration. The implementation of DL/T 259-2023 helps to improve the efficiency and safety of sulfur hexafluoride gas density relays. It is an important technical support document in the maintenance and management of power systems.