The impact of high-voltage lightning on the three units of catalytic cracking

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Through shutdown for renovation, the efficiency of the smoke exhaust fan in my unit has been improved; the motor remains in operation to generate power. Now, assuming that the main high-voltage motor trips, what will happen to the third-stage group? For the main motor to trip and trigger a chain shutdown, both conditions must be met: the main motor must trip and its speed must be below 6075 rbm. Therefore, under the current conditions, a high-voltage surge will not cause a chain shutdown. However, the issue is that when the main motor trips, it is still in operation and unable to generate power; as a result, what will happen to the speed of the smoke exhaust fan – will it increase or remain unchanged? Why? If the speed exceeds the limit, it is possible to manually shut down the system at a higher level; but if the speed remains unchanged, can the main motor be turned on? Why? My theoretical knowledge is limited, so I am unable to conduct proper analysis; I hope fellow sailors can offer guidance to help improve my emergency response skills.