Simulation test system and method for on-line monitoring terminal of primary equipment of intelligent substation

The invention discloses a simulation test system and method for an on-line monitoring terminal of primary equipment of an intelligent substation, and belongs to the technical field of on-line monitoring of the primary equipment of the intelligent substation. The host simulation device, the monitoring terminal and the sub-equipment simulation device are connected in sequence, and the sub-equipment simulation device simulates and monitors the signal type of a sensor of primary equipment of a transformer substation, and sends an SV message to the monitoring terminal or receives an SV message downloaded by the monitoring terminal; the host simulation device simulates a comprehensive application host or a service gateway machine communicating with the monitoring terminal, sends an MMS message to the monitoring terminal or receives the MMS message uploaded by the monitoring terminal, and realizes complete simulation of the real environment of the transformer substation; the sub-equipment simulation device completes