Summary of Three-Tier Power Distribution System: Primary: The main distribution panel, supplies power from the transformer. In a newly constructed residential area, a 10kV power line is introduced into the substation. detailed explanation of DB, SDB, MDB, RMU, and Switchgear along with any commonly related equipment you might have missed, including their purpose, application, and hierarchy in an electrical distribution system. Distribution Overview In a typical. Level 1 required configuration: Main circuit isolation + main circuit breaker and main fuse Shunt isolation + shunt leakage protection switch Level II required configuration: Main circuit general isolation + main circuit fuse and circuit breaker Shunt isolation + shunt fuse and circuit breaker. Let's make a hypothesis: a newly built residential area introduces a 10kV incoming line and builds a distribution room. 4kV to the distribution cabinet (primary distribution cabinet), then the outgoing line is led to the. Adheres to the principle of “one machine, one circuit breaker, one RCD, one box, one lock,” prohibiting a single circuit breaker from controlling multiple devices or outlets. Many feeders leave substation in a concrete ducts and are routed to a nearby pole.