When a single-phase grounding occurs in the system, due to voltage imbalance, the disconnection bloc

It should be distance protection action, because the premise is a single-phase ground fault, voltage imbalance, and sharp voltage drop, which are characteristics of ground faults. If the disconnection latch relay operates with distance protection latch, how can it be protected? The so-called line break blocking is to prevent the distance protection from malfunctioning when there is a sudden line break in the system.