CYG SUNRI provides Substation Intelligent Commissioning and Maintenance System, selects equipment such as time synchronization management test, substation relay protection intelligent inspection, monitoring information simulation verification, merge unit verification, protection tester, primary frequency modulation tester, stability test system, etc. according to needs to meet the requirements of timing synchronization test, station level communication test, process level equipment test, interlayer level equipment test, etc., making the substation commissioning and maintenance work more convenient and reliable, and improving work efficiency and quality.