The reliability of the auxiliary system will directly affect the safe and economic operation of hydropower plant

so it is necessary to on-site monitor and analyze the running state of auxiliary system for hydropower plant.On base of the instruction on the structure and working principle of the high-pressure gas system

the relationship between the abnormal actuating/showdown state of high compressors and corresponding failures of high-pressure gas system is summed up

and the relevance monitoring model for high-pressure gas system of hydropower plant is put forward.Then

by making use of the massive data sources provided by the cascade hydropower plants group remote centralized control system

the high-pressure gas system remote analysis and fault diagnosis platform has been established.At present

the platform has been put into trial industrial application

and two gas leakage failures of high-pressure gas system in a certain hydropower plant have been detected successfully.