Fault diagnosis device of transformer substation transformer based on Petri network

The invention relates to the technical field of power equipment, in particular to a Petri network-based transformer substation transformer fault diagnosis device, which comprises a cabinet body, a heat dissipation assembly, a ventilation assembly and a fixing assembly, the heat dissipation structure and the ventilation structure are connected, when the temperature of the transformer is abnormal, the heat dissipation structure stops rotating, the air outlet is closed, the ventilation assembly is closed through the connecting assembly, air circulation in the cabinet body is reduced, meanwhile, the automatic fire extinguishing system is started, compressed air is sprayed out, and the transformer is cooled; the compressed air tank can continuously absorb heat emitted by the transformer, time is provided for operators to come to overhaul, the compressed air tank is fixed through the fixing structure, the compressed air tank can be fixed through the clamping rods by being pushed inwards, when replacement is needed,