An online monitoring and fault prediction system for a high-voltage electrical device, the system comprising a high-voltage transformer online monitoring station, a GIS device online monitoring station, a high-voltage motor online monitoring station, a switch cabinet online monitoring station and an application server. Each online monitoring station stores information, detected in real time, in an edge computing gateway suitable for each high-voltage electrical device, and the edge computing gateway then transmits information in a set time period or information needed by a user to an application server, and the user can directly acquire the information in the application server by means of a mobile client via the Internet, or can acquire the information by means of a large display screen via the Ethernet. By means of the system, not only can the information storage burden of an application server be reduced by means of an edge computing gateway, real-time comprehensive monitoring of operation information and fault information of various high-voltage electrical devices can also be realized, and the information needs of a user can also be met.
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