Complete standard design for substation and enhance power supply reliability

Aiming at design defects of main connection in some substations leading to compelled power interruption under running or overhaul,this paper analyzes the reasons why four-section single bus configuration for three main transformers adopted by 10 kV connection and proposes measures to extend the third main transformer,install disconnector for main transformer on breaker,rearrange operation order of main transformers and enhance power supply reliability.